Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 1 | P a g e   

 

 

ContentsContents..................................................................................................................................................1

Documents History .............................................................................................................................2

Introduction: ...........................................................................................................................................3

Modbus Specifics: ...............................................................................................................................4

Slave Devices:..................................................................................................................................4

Supported Commands: ...................................................................................................................4

Cyclic Redundancy Check (CRC16). .................................................................................................4

SpecView Generic Modbus Driver Specifics. ..................................................................................4

Table 1. Holding Register Map....................................................................................................5

Table 2.   Input Register Map.......................................................................................................7

Table 4. Detailed Alarm Status..................................................................................................16

Table 5.  GPRS Signal Strengh ....................................................................................................17

Notes.................................................................................................................................................18

NaN, “Not a number”........................................................................................................................ 18

Switch Closure, data format. ........................................................................................................18

Phone Number format. .................................................................................................................19

GPRS Firmware Version Formatting .............................................................................................20  

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 2 | P a g e   

 

Documents History • Issue 1:  Initial documents release. 

• Issue 2:  Changed Bit‐Map in Table 4.  Detailed Alarm Status; bit 0 (Channel Enabled), was Channel Not Enabled. 

• Issue 3: Added Command 06 (write single register). Changed TimeZoneOffset from hours to minutes. 

• Issue 4: Added note for Switch Closure data format, and minor corrections to text. 

• Issue 5: Added Holding Register 40009, “SaveBaseStationConfig”. 

• Issue 6: Changed Bit‐Map in Table 4. Detailed Alarm Status; 

Bit 0: Renamed to Transmitter Enabled. Was Channel Enable. 

Bit 6: Humidity Channel enabled added, was alarms 0. 

Bit 7: Universal Channel enabled added, was alarms 0. 

• Issue 7: Changed Tx?_AlarmsWarnings  position in Modbus map. Originally located at registers 30033 to 30048, now each register is located next to a appropriate transmitter. This means all transmitter data can be read on one block read. 

• Issue 8: Added Holding Register 40010, “User LED control”. 

• Issue 9:  Using Firmware version SIG‐1026‐15 and above. Added alarmWarnings for all transmitters in registers 30033 to 30048.  Registers for GPRS modem. Added GPRS Signal Strength. Added Phone numbers 1 and 2. Added GPRS Firmware Version. 

• Issue 10: Removed null character from phone number format. Added Enable sms alarms register. Modem Error Code register. 

• Issue 11:  (Firmware SF‐1026‐16 or later required)  (Date: 21st March 2011)  Duplicated RTC on input registers 29 and 30, moved Alarm Register by 1 register Moved Basestation Temperature from input register 29 to  235 Register 31 is now a dummy (empty space) Register 32 is now Basestation Reset 

• Issue 12: Refined GPRS signal strength description. 

• Issue 13: Move Register 40014 (alarm block available) to 40015 Added Register 40014 (modem warning_code). This breaks support with older windows server, upgrade needed.  Table 3 Removed, contact Engineering for Block transfer manual. 

• Issue 14 Corrected mistake  on input register numbers on Page 14 from alarm Phone number 1 and on.  

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 3 | P a g e   

 

Introduction: This document contains the Modbus RTU data map for the spYdaq system. The spYdaq base station is a Modbus RTU slave with a single RS232 port. The physical layer parameters like baud rate can be changed using the USB configuration software for spYdaq. 

The map allows access to the following data. 

1. Last received parameters from all 16 transmitters (Int Temp, RH and Universal) 

2. Last received radio message time stamp. 

3. Alarms and Status data for each of the 16 transmitters 

4. Date of last calibration for all 16 transmitters. 

5. Internal Temperature of the Base Station. 

6. Base Station Real Time Clock (UTC = Universal Time Clock) 

7. Base Station Local Time offset  

8. Block mode, data logger download. Use for embedded java GPRS modem, not currently supported by SpecView. 

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 4 | P a g e   

Modbus Specifics: 

Slave Devices:   The spYdaq node address is changeable via the USB configuration software. The allowable range is 1 to 247. 

Supported Commands: • Command 0x03  Read Holding Register.  

Read holding registers starting at address 40001.  

• Command 0x04 Read Input Register.  

Read Input registers starting at address 30001.  

• Command 0x06 Write Single Holding Register 

Write single holding registers starting at address 40001.  

(not Input registers, which are read only).  

• Command 0x10 Write Multiple Registers. 

Write multiple registers allows writing of Holding registers only  

(not Input registers, which are read only).  

Cyclic Redundancy Check (CRC16). spYdaq conforms to the standard CRC16 specification. Contact Signatrol for more information. 

SpecView Generic Modbus Driver Specifics. If using the SpecView generic Modbus driver the following setup is required. 

• Read floats as reversed IEEE. • Read Dates as reversed long, when load in to SpecView TimeDate variable. 

 

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 5 | P a g e   

 

Table 1.  Holding Register Map • Read Holding Registers using Command 3 [0x03]. • Write Single Register using Command 6 (0x06) • Write Multiple Registers using Command 16 [0x10].

Holding Register

Index

Implemented In SpecView

Reference

Size

Description

40001 0 No Reading Block Available 1 Register, 16bit unsigned integer

If (Reading Block Available == 0) No transmission block available else Transmission block ready to read. This register should be cleared by the Master after reading the transmission block. The Slave will reset this register once it has loaded the next transmission block.

40002 1 Yes clear_alarms_pending 1 Register, 16bit unsigned integer

Set to none zero to force all alarms to be cleared. Slave will set this register to 0 when completed.

40003 2 Yes IEEE Floating Point Byte Order

1 Register, Unsigned Integer

 Byte A B C D Value 0x41 0x40 0x00 0x00

 Register Value Byte Order 0 ABCD 1 DCBA 2 BADC 3 CDAB

40004 3

40005 4

Yes

UTC Real Time Clock 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Universal Time Clock. Elapsed seconds since 01/01/1970, must be UTC not local time. Value is battery backed within base station. After setting the RTC via Modbus, the SaveRTC register to be set to non-Zone to force a save. Otherwise the clock will return to its previous value when the base station is re-powered.

40006 5 Yes TimeZoneOffset 1 Register, 16bit Signed Value

Local Time Zone Offset in minutes Example: Bogota = -300, GMT = 0, Baghdad = +180 After setting the TimeZoneOffset via Modbus, the SaveRTC register to be set to non-Zone to force a save. Otherwise the TimeZoneOffset will return to its previous value when the base station is re-powered.

40007 6 Yes SaveRTC 1 Register, 16bit Unsigned integer

Setting SaveRTC to non-Zero will cause the base station to save the current “UTC Real Time Clock” and TimeZoneOffset Slave will set this register back to 0 when save is completed.

40008 7 Yes ModBusTemperatureUnits 1 Register, 16 bit Enumeration

Temperature Units applied to latest readings only, not block mode. Enumeration as follows °C = 0, °F = 1, °K = 2, °C > 2

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 6 | P a g e   

Holding Register

Index

Implemented In SpecView

Reference

Size

Description

40009 8 Yes SaveBaseStationConfig 1 Register, 16 bit Unsigned integer

Setting SaveBaseStationConfig to non-Zero will cause the base station to save the following parameters:

• ModBusTemperatureUnits • IEEE Floating Point Byte Order

Slave will set this register back to 0 when save is completed

40010 9 No User LED control 1 Register, 16 bit Unsigned integer

Sets LED flash rate for User Led on device front panel. 0 = OFF 65535 = ON (NO FLASH) A value between 1 and 15 will result in a number of flashes and then a 5 second break. The number of flashes produced will be the value of the register. Value is volatile, and reset to 0 on power up.

40011 10 No GPRS Signal Strength 1 Register, 16 bit Unsigned integer

Default value is 99. See table 5.

40012 11 No GPRS Modem Firmware Version Information

1 Register, 16 bit Unsigned integer

See Notes, GPRS Version Number formatting. If this value is non-Zero, Modem screen will be available on LCD and via spY-Config. Is modem is reset by Basestation this register will reset to 0.

40013 12 No Modem Error Codes 1 Register,

Default Value = 0 (when Basestation powers up). Value dependant on modem software. The Basestation has an option to reset the modem is the value in this register is non –Zero. Is the Basestation resets the modem, this register will reset to 0. Error code in hex will be displayed on lcd screen, once the firmware version is set to non-zero.

40014 13 No Modem Warning Codes 1 Register Default Value = 0. Basestation will write any warnings codes to this register. Warning code in hex will be displayed on lcd screen, once the firmware version is set to non-zero.

40015 14 No Alarm Block Available If (Alarm Block Available == 0) No Alarm block available else Alarm block ready to read. This register should be cleared by the Master after reading the alarm block. The Slave will reset this register once it has loaded the next alarm block.

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 7 | P a g e   

Table 2.     Input Register Map • Read Input Registers using Command 4 [0x04]

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30001 0 No Dummy 1 Register Not Currently in use

30002 1 No Transmission block Start reading_timestamp_Hword

30003 2 No reading_timestamp_Lword

2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

30004 3 No unit_type 1 Register, Unsigned integer

30005 4 No device_address 1 Register, Unsigned integer

30006 5 No Flags 1 Register, Unsigned integer

30007 6 No Internal_temp_Hword

30008 7 No Internal_temp_Lword

2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

30009 8 No Humidity_Hword

30010 9 No Humidity_Lword

2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

30011 10 No Universal_Hword

30012 11 No Universal_Lword

2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

30013 12 No date_of_last_cal_Hword

30014 13 No date_of_last_cal_Lword Transmission block End

2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Contact Signatol Engineering Dept f or block transfer manual.

30015 14 No Dummy 1 Register Not Currently in use

30016 15 No Dummy 1 Register Not Currently in use

30017 16 No Dummy 1 Register Not Currently in use

30018 17 No Dummy 1 Register Not Currently in use

30019 18 No Dummy 1 Register Not Currently in use

30020 19 No Alarm Block Start Alarm_Time stamp_Hword

30021 20 No Alarm_Time stamp_Lword

2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

30022 21 No Alarm Source 1 Register, Unsigned integer

30023 22 No Alarm Channel 1 Register, Unsigned integer

30024 23 No Alarm Type Alarm Block End

1 Register, Unsigned integer

Contact Signatol Engineering Dept f or block transfer manual.

30025 24 No Dummy 1 Register Not Currently in use

30026 25 No Dummy 1 Register Not Currently in use

30027 26 No Dummy 1 Register Not Currently in use

30028 27 No Dummy 1 Register Not Currently in use

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 8 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30029 28 No Basic Alarm Status 1 Register, Bit Map Bit Description Format 15

(msb) Alarm Tx15 0 = No Alarm,

1 = Alarm 14 Alarm Tx14 0 = No Alarm,

1 = Alarm 13 Alarm Tx13 0 = No Alarm,

1 = Alarm 12 Alarm Tx12 0 = No Alarm,

1 = Alarm 11 Alarm Tx11 0 = No Alarm,

1 = Alarm 10 Alarm Tx10 0 = No Alarm,

1 = Alarm 9 Alarm Tx9 0 = No Alarm,

1 = Alarm 8 Alarm Tx8 0 = No Alarm,

1 = Alarm 7 Alarm Tx7 0 = No Alarm,

1 = Alarm 6 Alarm Tx6 0 = No Alarm,

1 = Alarm 5 Alarm Tx5 0 = No Alarm,

1 = Alarm 4 Alarm Tx4 0 = No Alarm,

1 = Alarm 3 Alarm Tx3 0 = No Alarm,

1 = Alarm 2 Alarm Tx2 0 = No Alarm,

1 = Alarm 1 Alarm Tx1 0 = No Alarm,

1 = Alarm 0

(lsb) Alarm Tx0 0 = No Alarm,

1 = Alarm 30030 29

30031 30

Yes

UTC Real Time Clock 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Universal Time Clock. Elapsed seconds since 01/01/1970, must be UTC not local time. Value is battery backed within base station.

30032 31 No Dummy 1 Register Not Currently in use

30033 32 No BaseStation_Reset 1 Register, Bit Map Value = 0 = BaseStation not reset Value = 1 = Basestation has been reset. Reading this register will clear the value back to zero.

30034 33 No Tx0_AlarmsWarning 1 Register, Bit Map 30035 34 No Tx1_AlarmsWarning 1 Register, Bit Map 30036 35 No Tx2_AlarmsWarning 1 Register, Bit Map 30037 36 No Tx3_AlarmsWarning 1 Register, Bit Map 30038 37 No Tx4_AlarmsWarning 1 Register, Bit Map 30039 38 No Tx5_AlarmsWarning 1 Register, Bit Map 30040 39 No Tx6_AlarmsWarning 1 Register, Bit Map 30041 40 No Tx7_AlarmsWarning 1 Register, Bit Map 30042 41 No Tx8_AlarmsWarning 1 Register, Bit Map 30043 42 No Tx9_AlarmsWarning 1 Register, Bit Map 30044 43 No Tx10_AlarmsWarning 1 Register, Bit Map 30045 44 No Tx11_AlarmsWarning 1 Register, Bit Map 30046 45 No Tx12_AlarmsWarning 1 Register, Bit Map 30047 46 No Tx13_AlarmsWarning 1 Register, Bit Map 30048 47 No Tx14_AlarmsWarning 1 Register, Bit Map 30049 48 No Tx15_AlarmsWarning 1 Register, Bit Map

See Table 4

30050 49

30051 50

Yes Tx0_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 9 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

01/01/1970 30052 51

30053 52

Yes

Tx0_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30054 53

30055 54

Yes

Tx0_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30056 55

30057 56

Yes Tx0_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30058 57 Yes Tx0_AlarmsWarning 1 Register, Bit Map See Table 4 30059 58

30060 59

Yes Tx1_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30061 60

30062 61

Yes

Tx1_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30063 62

30064 63

Yes

Tx1_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30065 64

30066 65

Yes Tx1_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30067 66 Yes Tx1_AlarmsWarning 1 Register, Bit Map See Table 4 30068 67

30069 68

Yes Tx2_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30070 69

30071 70

Yes

Tx2_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30072 71

30073 72

Yes

Tx2_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30074 73

30075 74

Yes Tx2_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30076 75 Yes Tx2_AlarmsWarning 1 Register, Bit Map See Table 4 30077 76

30078 77

Yes Tx3_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30079 78

30080 79

Yes

Tx3_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 10 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

point number 30081 80

30082 81

Yes

Tx3_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30083 82

30084 83

Yes Tx3_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30085 84 Yes Tx3_AlarmsWarning 1 Register, Bit Map See Table 4 30086 85

30087 86

Yes Tx4_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30088 87

30089 88

Yes

Tx4_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30090 89

30091 90

Yes

Tx4_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30092 91

30093 92

Yes Tx4_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30094 93 Yes Tx4_AlarmsWarning 1 Register, Bit Map See Table 4 30095 94

30096 95

Yes Tx5_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30097 96

30098 97

Yes

Tx5_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30099 98

30100 99

Yes

Tx5_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30101 100

30102 101

Yes Tx5_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30103 102 Yes Tx5_AlarmsWarning 1 Register, Bit Map See Table 4 30104 103

30105 104

Yes Tx6_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30106 105

30107 106

Yes

Tx6_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30108 107

30109 108

Yes

Tx6_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30110 109 Yes Tx6_UniversalChannel 2 Registers, Single Transmitter Universal Channel

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 11 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30111 110

Precision 4 byte IEEE Standard 754 floating point number

If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30112 111 Yes Tx6_AlarmsWarning 1 Register, Bit Map See Table 4 30113 112

30114 113

Yes Tx7_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30115 114

30116 115

Yes

Tx7_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30117 116

30118 117

Yes

Tx7_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30119 118

30120 119

Yes Tx7_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30121 120 Yes Tx7_AlarmsWarning 1 Register, Bit Map See Table 4 30122 121

30123 122

Yes Tx8_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30124 123

30125 124

Yes

Tx8_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30126 125

30127 126

Yes

Tx8_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30128 127

30129 128

Yes Tx8_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30130 129 Yes Tx8_AlarmsWarning 1 Register, Bit Map See Table 4 30131 130

30132 131

Yes Tx9_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30133 132

30134 133

Yes

Tx9_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30135 134

30136 135

Yes

Tx9_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30137 136

30138 137

Yes Tx9_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30139 138 Yes Tx9_AlarmsWarning 1 Register, Bit Map See Table 4 30140 139 Yes Tx10_Last_Reading_TimeStamp 2 Registers, 32 bit Time of last received message from Tx.

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 12 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30141 140

long, MSB First Seconds Single 01/01/1970

If 01/01/1970, then no message received since last reset.

30142 141

30143 142

Yes

Tx10_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30144 143 `

30145 144

Yes

Tx10_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30146 145

30147 146

Yes Tx10_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30148 147 Yes Tx10_AlarmsWarning 1 Register, Bit Map See Table 4 30149 148

30150 149

Yes Tx11_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30151 150

30152 151

Yes

Tx11_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30153 152

30154 153

Yes

Tx11_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30155 154

30156 155

Yes Tx11_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30157 156 Yes Tx11_AlarmsWarning 1 Register, Bit Map See Table 4 30158 157

30159 158

Yes Tx12_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30160 159

30161 160

Yes

Tx12_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30162 161

30163 162

Yes

Tx12_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30164 163

30165 164

Yes Tx12_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30166 165 Yes Tx12_AlarmsWarning 1 Register, Bit Map See Table 4 30167 166

30168 167

Yes Tx13_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30169 168

30170 169

Yes

Tx13_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 13 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30171 170

30172 171

Yes

Tx13_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30173 172

30174 173

Yes Tx13_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30175 174 Yes Tx13_AlarmsWarning 1 Register, Bit Map See Table 4 30176 175

30177 176

Yes Tx14_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30178 177

30179 178

Yes

Tx14_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30180 179

30181 180

Yes

Tx14_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30182 181

30183 182

Yes Tx14_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30184 183 Yes Tx14_AlarmsWarning 1 Register, Bit Map See Table 4 30185 184

30186 185

Yes Tx15_Last_Reading_TimeStamp 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Time of last received message from Tx. If 01/01/1970, then no message received since last reset.

30187 186

30188 187

Yes

Tx15_TemperatureChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter internal temperature channel. For units see ModBusTemperatureUnits Not set = Nan, see notes on Nan.

30189 188

30190 189

Yes

Tx15_HumidityChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Humidity Channel. Units always %RH. Not set = Nan, see notes on Nan

30191 190

30192 191

Yes Tx15_UniversalChannel 2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

Transmitter Universal Channel If Temperature data then see ModbusTemperatureUnits for correct units. Otherwise value is unit-less. Check notes for Switch Contact data format. Not Set = Nan, see notes on Nan

30193 192 Yes Tx15_AlarmsWarning 1 Register, Bit Map See Table 4 30194 193

30195 194

Yes Tx0_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30196 195

30197 196

Yes Tx1_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30198 197

30199 198

Yes Tx2_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30200 199

30201 200

Yes Tx3_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single

Date of last calibration of Tx. If 01/01/1970 then not set.

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB Title: spYdaq Modbus RTU Manual. 14 | P a g e   

Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

01/01/1970 30202 201

30203 202

Yes Tx4_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30204 203

30205 204

Yes Tx5_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30206 205

30207 206

Yes Tx6_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30208 207

30209 208

Yes Tx7_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30210 209

30211 210

Yes Tx8_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30212 211

30213 212

Yes Tx9_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30214 213

30215 214

Yes Tx10_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30216 215

30217 216

Yes Tx11_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30218 217

30219 218

Yes Tx12_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30220 219

30221 220

Yes Tx13_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30222 221

30223 222

Yes Tx14_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30224 223

30225 224

Yes Tx15_CalibrationDate 2 Registers, 32 bit long, MSB First Seconds Single 01/01/1970

Date of last calibration of Tx. If 01/01/1970 then not set.

30226 225 No Dummy 1 Register Not Currently in use 30227 226

30228 227

30229 228

30230 229

No Alarm Phone number 1 4 Registers, 64 bit Packed digits, 16 chacters

30231 230

30232 231

30233 232

No Alarm Phone number 1 4 Registers, 64 bit Packed digits, 16 chacters

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

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Input Register

Command Index

Implemented In SpecView

Reference

Size

Description

30234 233

30235 234 No Enable SMS alarms 1 Register. Only when GPRS modem is fitted. Value = 1 = Modem to send SMS alarm, Value 1 = Modem will not send SMS alarms.

30236 235 No 30237 236 No

Basestation Internal Temperature

2 Registers, Single Precision 4 byte IEEE Standard 754 floating point number

BaseStation internal temperature channel.

 

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

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Table 4.  Detailed Alarm Status 

Bit Description Format Format 15 (msb) High Alarm on Universal Channel 0 = No Alarm, 1 = Alarm 14 Low Alarm on Universal Channel 0 = No Alarm, 1 = Alarm 13 High Alarm on Humidity 0 = No Alarm, 1 = Alarm 12 Low Alarm on Humidity 0 = No Alarm, 1 = Alarm 11 High Alarm on Internal Temperature 0 = No Alarm, 1 = Alarm 10 Low Alarm on Internal Temperature 0 = No Alarm, 1 = Alarm 9 Not used Always 0 8 Not used Always 0 7 Universal Channel Enabled 0 = False, 1 = True 6 Humidity Channel Enabled 0 = False, 1 = True 5 Calibration Warning 0 = No Due, 1 = Due < 4 weeks 4 Calibration Over Due 0 = Not Over Due, 1 = Over Due 3 Low Battery 0 = No Alarm, 1 = Alarm 2 Calibration Corrupted 0 = No Alarm, 1 = Alarm 1 Reading is late 0 = No Alarm, 1 = Alarm 0 Transmitter Enabled 0 = False, 1 = True

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

105 Church Street, Tewkesbury, Gloucestershire, GL20 5AB 

Table 5.   GPRS Signal Strengh The value of X (rssi) can be obtained from the modem using the AT+CSQ command. See modem documentation. 

 

X  (Rssi Value)  Signal dBm  Equation  Interpretation 

0  ‐113 dBm  dBm = ‐113  Insufficient 

1 to 10  ‐111 to ‐95 dBm  dBm = ((x ‐1)* 1.78) – 111  Insufficient 

11 to 30  ‐93 to ‐53 dBm  dBm = ((x ‐11)* 2.11) – 93   ‐84.6dBm) Fair 

=>20 (> ‐74.0dBm) Good 

31 (max)  ‐51 dBm  dBm = ‐51dBm  Excellent 

99  ?  dBm = ?  Unknown / not Detectable 

 

GPRS Received Signal Strength

-115.0

-105.0

-95.0

-85.0

-75.0

-65.0

-55.0

0 4 8 12 16 20 24 28 32

X (Rssi Value)

dBm

 

Title: spYdaq Modbus RTU Manual. 17 | P a g e   

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

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Notes 

NaN, “Not a number” When readings floating point numbers, each returned value needs to be checked for Nan before the value is processed and displayed. Nan represents an invalid, out of range, or un‐initialised value. The floating point data for Nan is the hex number 0x7FC00000. When displaying floats, is Nan occurs “XXX” should be displayed.  

Nan is possible if a transmitter’s data is late or has never been received. The Modbus master can use the Nan to mask out the reading, and therefore not add it to its historical data. If the Modbus master has the ability, it can process the transmitters detailed status and check if a channel is enabled before polling the appropriate floating point number. 

Switch Closure, data format. If the transmitter’s universal input is set to Switch Contact, the following data applies. 

• Returned Float = 0.0, Switch is closure (resistance  150 ohms). 

• Returned Float = Nan, no data received for this device.  

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

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Phone Number format. Two phone numbers can be programmed into the Basestation via spY‐Config. Each phone number can be up to 16 characters. Only characters listed in the table below are available, each character is made up of a 4bit number. 

Value 0 1 2 3 4 5 6 7 8 9 A B C D E F

Binary 0000 0001

0010

0011

0100

0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

Character

“0” “1” “2” “3” “4” “5” “6” “7” “8” “9” “+” SPACE

SPACE

SPACE

SPACE

SPACE

 

Using the format about, a 16digit phone number is implemented as below 

Example 1: 

Phone number:  00441684299399 

Phone Number “ “ “ “ “0” “0” “4” “4” “1” “6” “8” “4” “2” “9” “9” “3” “9” “9”

Character Code

B B 0 0 4 4 1 6 8 4 2 9 9 3 9 9

Binary 1011 1011 0000 0000 0100 0100 0001 0110 1000 0100 0010 1001 1001 0011 1001 1001

Modbus Register

30227 30228 30229 30230

Register Value Binary

1011101100000000 0100010000010110 1000010000101001 1001001110011001

Register Value Decimal

47872 17430 33833 37785

 

  

 Drawing Number: SIG-1223-01 Issue 14 Signatrol Ltd. 

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GPRS Firmware Version Formatting The modem contains JAVA firmware, the version number can be written by the modem to the appropriate register [GPRS Firmware Version]. The format is as follows. 

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Description Major Minor Revision

Bit 4 3 2 1 0 4 3 2 1 0 5 4 3 2 1 0

Range 0 to 32 0 to 32 0 to 64

 

Note: The default value for register is 0. The Basestation will display information from the modem is the register is non‐zero. 

 

When non‐zero, the display will indicate the firmware version and the GPRS signal strength. Also when the firmware version is non‐zero, spY‐Config will allow the setting for the modem timeout and 2 phone numbers. 

 

 

Example 1: 

Firmware is version:   1.0.13 

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Description Major = 1 Minor = 0 Revision = 13

Bit 4 3 2 1 0 4 3 2 1 0 5 4 3 2 1 0

Binary 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 1

Register Value

2061

 

 

 

 

 

 

 

  

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Documents HistoryIntroduction:Modbus Specifics:Slave Devices: Supported Commands:Cyclic Redundancy Check (CRC16).SpecView Generic Modbus Driver Specifics.

Table 1. Holding Register MapTable 2. Input Register MapTable 4. Detailed Alarm StatusTable 5. GPRS Signal StrenghNotesNaN, “Not a number”Switch Closure, data format.Phone Number format.GPRS Firmware Version Formatting