PC104 I/F Use and Maintenance Bitbus Manual for PC · 1. Bitbus speciﬁcations The Bitbus is a...

Order Code:

Date: 07/2014 - Rev: 1.2

5904516101

Use and MaintenanceManual

PC104I/F

Bitbusfor PC

Index1. Bitbus specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32. Main board features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43. Board configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 3.1 Type of transmission. . . . . . . . . . . . . . . . . . . . . . . 4 3.2 Node address . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 4 3.3 External storage configuration . . . . . . . . . . . . . . 5 3.4 Interface with the PC . . . . . . . . . . . . . . . . . . . . . . 5 3.5 Message transfer mode . . . . . . . . . . . . . . . . . . . . 5 3.6 Terminal resistor . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.7 Additional functions . . . . . . . . . . . . . . . . . . . . . . 6 3.8 Default configuration . . . . . . . . . . . . . . . . . . . . . . 6 3.9 Bitbus network connectors . . . . . . . . . . . . . . . . . 6 3.10 Connection to the external driver . . . . . . . . . . . 6

PC CARD - PC104 I/F BITBUS FOR PC

ORDER CODE 5904516101JULY 2014 - REV. 1.2

SYSTEM SPA (Electronics Div.) reserves the right tomake changes to the specifications at any time withoutgiving prior notice. The information contained herein iscorrect and reliable. No part of this publication may bereproduced in any form without prior authorisation fromSYSTEM SPA (Electronics Div.).

This product meets the EMC requirementsof EEC Directive 89/336.

Revisions Pages

Rev. 1.0 Draft 6

Rev. 1.1 Alteration 6

Rev. 1.2 Alteration 6

SYSTEM s.p.a. Div. Electronics

via Ghiarola Vecchia, 73

41042 Fiorano (Mo) Italy

tel 0536/836111 - fax 0536/830901

www.system-group.it

e-mail: [email protected]


ORDER CODE 5904516101

1. Bitbus specificationsThe Bitbus is a serial communication system based onelectrical code RS485 that employs an SDLC protocol.The network is based on a hierarchy that has a singlemaster node that communicates with several slavenodes. Each slave can work as a master for anotherBitbus network, thereby constituting a multiple hierarchy.This is particularly useful in applications that requiredifferent transmission rates (Figure 1.1).

Figure 1.1 Typical Bitbus network connection.

The Bitbus interconnection may work in two differentways: synchronous mode and self-clocked mode. Thefirst uses a faster transmission rate but is limited as faras distance and number of network nodes are concerned.Due to these drawbacks, the PC-188 board uses onlythe self-clocked mode.

SELF-CLOCKED MODE: unlike the previous mode, thisis suitable for long-distance transmission. Two differenttransmission rates are employed: 375Kbit/sec and62.5Kbit/sec. The first transmission rate is able to coverdistances of up to 300m with a max of 28 nodes connectedto the line.

On the other hand, the 62.5Kbit/sec rate covers a maxdistance of 1200m with the same number of nodes. Forlonger distances, the repeaters have to be used and amax of 250 nodes can be connected. Figure 1.2 illustratesthe self-clocked mode connection with repeaters.

Figure 1.2 Example of Bitbus network connection in self-clockedmode with repeaters.

Transmission in synchronous mode (not supported) andself-clocked mode with repeaters is implemented withscreened five-wire cables (a twisted pair for DATA, DATA-another pair of twisted cables is used for RTS, RTS- anda RGND reference wire), Figure 1.3.

Figure 1.3 Connections for synchronous or self-clocked modewith repeaters.

MASTER

MASTERMASTER

SLAVE

SLAVE

SLAVE

SLAVE

Bitbus

Bitbus Bitbus

SLAVE

DATA PAIR

DATA PAIR

RTS PAIR

MASTER

SLAVE

SLAVE

REPEATER

REPEATER

REPEATER

DATADATA*DCLK/RTSDCLK/RTS*RGND

A shielded 3-wire cable is required when using self-clocked mode without repeaters (a twisted pair dedicatedto DATA and DATA- transmission and a RGND referencewire), Figure 1.4.

Figura 1.4 Connection for self-clocked without repeaters.

The correct layout of the various modes is shown inFigure 1.5. In particular, there cannot be any starnetworks and, moreover, terminal resistors have to beplaced at either end of the network. The rating of theterminal resistors has to match the typical impedanceof the connecting cable to prevent reflectance on theline.

Figure 1.5 Correct layout of Bitbus network nodes.

Table 1.1 Bitbus network operating modes.

DATADATA*

RGND

R term.

R term.

SELF-CLOCKED62.5Kbps

SELF-CLOCKED375Kbps

Number of nodes among repeaters 28

Max number of repeaters on the Bitbus line 10 2

Max number of nodes on the Bitbus line 251 84

Required lines couples12(without repeaters)(with repeaters)

Max distance among repeaters 1200m 300m

Total distance the Bitbus line can run 13.2Km 900m

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2. Main board featuresYou can insert the card on PC104 bus, that allows tomanage the I/O space typical of IBM AT/XT besidesinterfacing with a Bitbus net.

• CPU Am188ES

• CPU clock frequency: 40MHz

• Configurable external data storage capable ofsupporting RAM ranging from 32Kx8 to 512Kx8.The data memory address ranges from 00000H upto 7FFFFH

• Configurable external code storage capable ofsupporting various EPROMs and FLASH EPROMranging from 128Kx8 to 512Kx8. The addresses gofrom 80000H to FFFFFH

• External I/O space mapped I/O, starting from 00H

• I/O space that can be managed on ISA 00H -:-3FFH bus

• Bitbus serial interface that supports the self-clocked mode (baud rate 375Kbit/sec or 62.5Kbit/sec)

• The Bitbus network is opto-insulated through theinternal logic system (500VDC)

• The board is protected against transientinterferences affecting the Bitbus network

• Connection to the Bitbus network with 1 connector10 poles

• PC-parallel interface consisting of twounidirectional 9 bit, 1 byte FIFOs, two registers forextra-Bitbus communications and a few Status bits

• One CPU Am188ES interface (RS232)

• Required operating conditions:Temperature: 0-60 °CRelative humidity: UR 85% no condensate

• Dimensions:Length: 9 cm, Width: 10 cm, Weight: 180 grams

• Power requirements: 2.5W (5VDC ±5%)

3. Board configuration3.1 Type of transmission

The transmission rate is strictly related to the perfor-mance to be achieved by the network. Up to 13.2Kmcan be reached with 62.5KB. On the other hand, thedistance is reduced to 900m when the 375Kbps rate isused.

The transmission rate is set by inserting jumper JA0 for62.5KB and removing it when 375KB is used.

3.2 Node address

The node address simply identifies the node inside theBitbus network. Addresses can be configured within arange of 01H-FAH for slave nodes while address 00H isfor the network master and addresses FBH-FFH arereserved, as per directives IEEE 1118.

The node address is set with jumpers JS0-JS7. JumperJS0 corresponds to the least significant bit, while jumperJS7 is for the most significant one. A short-circuitedjumper corresponds to 1 in the binary configuration ofthe address. When open, it corresponds to 0. The relationbetween the jumper/bit of an address is shown in thefigure below:

Figure 3.2.1 Node address configuration.

J6

JF0JF123456

JFJFJFJFJF

RAM

JS0

JS1

JS2

JS3

JS4

JS5

JS6

JS7

JMP

Bit0

1

2

bit

bit

bit3

bit4

bit5

bit6

bit7

BitsLSB

MSB

EPROM/FLASH

J4

J3J2HL1 (red LED)

HL2 (green LED)HL3 (ser LED)HL4 (power)

RS232Connector

XP4

JA7JA6JA5JA4JA3JA2JA1JA0

JRQ15

JRQ14

JRQ12

JRQ11

JRQ10

JRQ9

JRQ7

JRQ6

JRQ5

JRQ4

JRQ3

JS0

JS1

JS2

JS3

JS4

JS5

JS6

JS7

TINT

RINT

1

J16

JT1

JT2

J17

ExternalDriverConnectorXP5

BitBusConnectorXP3

JULY 2014 - REV. 1.2



3.3 External storageconfiguration

The CPU can be provided with up to 512KB EPROM/CODE FLASH and up to 512KB DATA RAM. The defaultconfiguration is 128K CODE EPROM and 32K DATA RAM.

Figure 3.3.1

The dimensions of the DATA RAM are set by usingjumpers J2 and J3:

Table 3.3.1

The dimensions of the EPROM/CODE FLASH is set byusing jumpers J16, J4 and J6.

Table 3.3.2

3.4 Interface with the PC

The base address where the board is located should beselected by the user with jumpers JF0-JF6. It can rangefrom 000H to 3F8H with 8 byte blocks. The addressjumper relation is shown in the table below:

Table 3.4.1 Relation between address bit/jumper for selectingthe board base address.

Bit2, bit1 and bit0 are used to decode the particularaddressed byte (data, command, state).

When the jumpers are put in, “1” is typed in for therespective bit which will then be compared to the busaddress. Bit9 of the address has to be 1.

CODEMEMORY(EPROM

orFLASH)

DATAMEMORY(RAM)

80000H 00000H

FFFFFH 7FFFFH

J3 ON

J3 OFF

J2 OFF

J2 ON

RAM 32/128x8

RAM 512x8

J16 1-2

J16 2-3

EPROM 1/4 MB

FLASH 1/4 MB

J6 ON

J6 OFF

J4 OFF

J4 ON

FLASH 1/4 MB

EPROM 1/4 MB

Jumper JF6 JF5 JF4 JF3 JF2 JF1 JF0

bits bit9 bit8 bit7 bit6 bit5 bit4 bit3

default(208H) ins.

NOins.

NOins.

NOins.

NOins.

NOins.

ins.

The interface with the PC uses a transmission protocolbased on:

- a data byte

- a command byte

- a state byte

- a pair of bytes reserved for future communicationsrelated to application programs and not directlyconnected to the Bitbus communications.

The table below shows the relation between the I/Oport and address according to the selected base address.

Table 3.4.2 Relation between the I/O port and address accordingto the base address.

3.5 Message transfer mode

Messages can be transferred between the PC and boardin either polling or interrupt mode. To select the modein which data is exchanged, set jumpers JQ3, …, JQ15.If no jumpers are installed, data is exchanged in pollingmode, vice-versa if the above-mentioned jumpers areset, interrupt mode will be used.

The interrupt levels available range from level 3 to level15. Level 10 and 15 are available only if the board isplugged in on a AT bus. The figure below shows a sectionguide of the interrupt levels for data transmission andreception.

NOTE:

The PC should have no interrupt sources with thesame interrupt level. Two free interrupt levels, onefor transmission (Tint) and one for reception (Rint),are required to operate in interrupt mode.

Figure 3.5.1

3.6 Terminal resistor

If the board is installed at the ends of the Bitbus network,the terminal resistors have to be placed on the DATAand RTS lines by inserting jumpers JT1 and JT2. If theboard is not at the ends of the Bitbus network, the twojumpers have to stay open.

REGISTRY ADDRESSADDRESSDEFAULT

CONCURREDOPERATIONS

DATOCOMMANDSTATEAux from 188Aux to 188

BASEBASE + 2BASE + 4BASE + 5BASE + 6

208H20AH20CH20DH20EH

READ/WRITEREAD/WRITEREADREADWRITE

JQ9

JQ7

JQ6

JQ5

JQ4

JQ3

JQ10

JQ11

JQ12

JQ15

JQ14

1

Tint

Rint

JULY 2014 - REV. 1.2



3.7 Additional functions

Jumpers JA6 can be used if total compatibility with thePC-44 version of the board (with 8044 Intel inside) isrequired.

If the PC extension executes a RXMEM master node ataddresses FFFE and FFFF when JA6 is set to OFF, thenode and configuration will be obtained as happenedwith the old PC-44.

On the other hand, if JA6 is set ON, the contents of thetwo storage locations will be provided.

Jumper JA7 can be used to activate (JA7 ON) the dynamicconfiguration of the board via FIFO. If JA7 is set to OFFthe board is configured according to the jumper settings.

3.8 Default configuration

Table 3.8.1

Jumper state function

JS0JS1JS2JS3JS4JS5JS6JS7

OFFOFFOFFOFFOFFOFFOFFOFF

00

set bit 0 of node addressset bit 1 of node addressset bit 2 of node addressset bit 3 of node addressset bit 4 of node addressset bit 5 of node addressset bit 6 of node addressset bit 7 of node address

JF0JF1JF2JF3JF4JF5JF6

ONOFFOFFOFFOFFOFFOFF

208H208H208H208H208H208H208H

set bit 3 of PC base addressset bit 4 of PC base addressset bit 5 of PC base addressset bit 6 of PC base addressset bit 7 of PC base addressset bit 8 of PC base addressset bit 9 of PC base address

JA0JA1JA2JA3JA4JA5JA6JA7

OFFOFFOFFOFFOFFOFFOFFOFF

FF

select a speed 375Kbpsnot usednot usednot usednot usednot usedfully compatible with 8044 Inteldynamic configuration disabled

JQ3JQ4JQ5JQ6JQ7JQ9JQ10JQ11JQ12JQ14JQ15

OFFOFFOFFOFFOFFOFFOFFOFFOFFOFFOFF

Connect IRQ3 to TINT(1-2) or RINT(2-3)Connect IRQ4 to TINT(1-2) or RINT(2-3)Connect IRQ5 to TINT(1-2) or RINT(2-3)Connect IRQ6 to TINT(1-2) or RINT(2-3)Connect IRQ7 to TINT(1-2) or RINT(2-3)Connect IRQ9 to TINT(1-2) or RINT(2-3)Connect IRQ10 to TINT(1-2) or RINT(2-3)Connect IRQ11 to TINT(1-2) or RINT(2-3)Connect IRQ12 to TINT(1-2) or RINT(2-3)Connect IRQ14 to TINT(1-2) or RINT(2-3)Connect IRQ15 to TINT(1-2) or RINT(2-3)

J3J2J6J4J16J17

ONOFFOFFON1-2ON

Selects RAM until 128Kx8Selects RAM until 128Kx8Selects EPROMSelects EPROMSelects EPROMEnable the inner Bitbus communication driver

JT1JT2

ONON

Terminals connected to DATA lineTerminals connected to RTS line

3.9 Bitbus network connectors

To connect the card to the Bitbus net we foresee a 10poles XP3 connector with assigned pinout.

Table 3.9.1 Pinout of the Bitbus network connectors.

The Bitbus network cable should have the DATA/DATA-signal pairs and RTS/RTS- twisted and shielded togetherwith the RGND line as shown in Figures 1.3 and 1.4.

By using rectangular connector XP4, and RS232 interfaceis always available.

The latter may be used by sending the SYSTEM Electronicscommands defined (Open, Send, Receive, Close) to taskGBS (ex RAC). As an alternative, the library functions ofan application program can be used for the samepurpose. This serial port may also be used for debugging(at source level) application programs (with toolsprovided by SYSTEM Electronics or other manufacturers).

Figure 3.9.1 Pinout connector XP4 RS232

3.10 Connection to the externaldriver

By a XP5 connector you can connect to the card anexternal line driver, for example a driver for fiber optic,that should be compatible with TTL signals:

XP5.1 TX

XP5.2 RX

XP5.3 IN-/OUT

XP5.4 GND

If we use an external driver you should disconnectedthe JL7 jumper.

PIN SEGNALE

12345

----GND--DATA-

SEGNALEPIN

678910

DATARTS-RTSRGND--

2 1

4 3

6 5

8 7

10 9

XP410 pin header

123456789

10

NCDTRTXCTSRXRTSDSRNCGNDNC

RS232

JULY 2014 - REV. 1.2

PC104 I/F Use and Maintenance Bitbus Manual for PC · 1. Bitbus speciﬁcations The Bitbus is a...

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