2070-7A/7B Manual - GDI Communications 2070-7A & 7B Manual A01248 Rev. C ... ELECTRICAL...

2070-7A/7B

Manual

Dual Serial Port Extender

For The 2070 Controller

For 2070-7A&B A00177 Rev. C and newer

Serial numbers starting at D701001

GDI 2070-7A & 7B Manual

A01248 Rev. C

GDI COMMUNICATIONS, LLC

879 DEMING WAY

SPARKS, NV 89431-6403

Telephone: (775) 345-8000 Fax: (775) 345-8010

Proprietary Data This document contains confidential, proprietary

data with all rights and titles reserved by GDI Communications LLC. By accepting this

document, the recipient assumes custody hereof and agrees not to disclose this data or any portion

of this data to any unauthorized person without the prior written consent of GDI Communications LLC. Recipient further agrees not to incorporate

these drawings, specifications or technical information, in whole or in part, in any other

product or endeavor.

THIS LEGEND SHALL BE INCLUDED ON

ANY REPRODUCTION OF THIS DOCUMENT

TABLE OF CONTENTS

GLOSSARY .................................................................................................................................................. 1

GENERAL DESCRIPTION ........................................................................................................................ 2

GENERAL CHARACTERISTICS ............................................................................................................. 3

DB9 TERMINATION TABLE ......................................................................................................................... 3 DB15 TERMINATION TABLE ....................................................................................................................... 3

INSTALLATION .......................................................................................................................................... 4

CONFIGURATION SWITCHES ........................................................................................................................ 4

ADJUSTMENTS .......................................................................................................................................... 5

THEORY OF OPERATION ....................................................................................................................... 6

SYSTEMS DESCRIPTION............................................................................................................................... 6 Block diagram 2070-7A ........................................................................................................................ 7 Block diagram 2070-7B ........................................................................................................................ 8

2070-7A DETAILED DESCRIPTION OF CIRCUIT OPERATION......................................................................... 9 2070-7B DETAILED DESCRIPTION OF CIRCUIT OPERATION ....................................................................... 11

MAINTENANCE ......................................................................... ERROR! BOOKMARK NOT DEFINED.

PREVENTATIVE MAINTENANCE .......................................................... ERROR! BOOKMARK NOT DEFINED. TROUBLE ANALYSIS ........................................................................... ERROR! BOOKMARK NOT DEFINED. VOLTAGE MEASUREMENTS ...................................................................................................................... 16 ALIGNMENT PROCEDURES ........................................................................................................................ 16

PARTS LIST ................................................................................. ERROR! BOOKMARK NOT DEFINED.

2070-7A PARTS LIST .......................................................................... ERROR! BOOKMARK NOT DEFINED. 2070-7B PARTS LIST .......................................................................... ERROR! BOOKMARK NOT DEFINED.

ELECTRICAL INTERCONNECTION DETAILS AND DRAWINGS ..... ERROR! BOOKMARK NOT

DEFINED.

SCHEMATIC AND LOGIC DIAGRAMS ................................. ERROR! BOOKMARK NOT DEFINED.

ASSEMBLY DRAWINGS ........................................................... ERROR! BOOKMARK NOT DEFINED.

1

GLOSSARY

Anti-Streaming – A function on GDI

modems that prevents a Host from

transmitting continuously.

DCD – Data Carrier Detect. An EIA

RS-232D control signal that can be

used to gate RXD to a DTE.

DCE – Data Communications

Equipment. A device that converts

data from a DTE to a transport

stream. For example. The GDI

model 400 modem is a DCE that

converts RS232 data from a

controller to a FSK Telco system.

DTE – Data Terminal Equipment. A

device that initiates communication

over RS232 lines.

CTS – Clear To Send. An EIA RS-

232D control signal that can be used

to gate TXD data from a DTE.

Full duplex – A communication

system where data can be

transmitted in both directions at the

same time.

Half duplex - A communication

system where data can be

transmitted in only one direction at a

time.

FSK – Frequency Shift Keying.

Communication protocol where data

is encoded into binary format and

represented by different

frequencies.

Host – Any DTE device.

Private wire – Telco communication

hardware that is leased for private

use.

SPACE – Signal state of a FSK

system that represents a logical “0”

value

0 dBm – Represents the signal level

required to produce 1mw in a 600Ω

load.

Surface mount parts – Electronic

parts that are designed to be

soldered to pads instead of vias.

RXD – Receive Data. An EIA RS-

232D data signal that transfers

information in form of binary data to

a DTE.

RTS – Request To send. An EIA RS-

232D control signal that can be used

to gate TXD to a DTE. The DTE

asserts RTS and then waits for the

DCE to respond with CTS.

2

GENERAL DESCRIPTION

The 2070-7A and 2070-7B serial port

buffer cards extend the serial

communication ports of the 2070

controller to the outside panel.

The 2070-7A provides two DB9

connectors for connecting to RS232

devices. Signals present on the DB9

connectors are RTS, CTS, TXD, DCD

and RXD. All signals are optically

isolated from the controller.

The 2070-7B provides two DB15

connectors for connecting to RS485

devices. Differential signals present

on the DB9 connectors are TXD,

TXC, RXD, and RXC. TXC can be

switched from TXCO to TXCI. All

signals are optically isolated from

the controller.

The front panel has indicators for

TXD, RXD, and Ch. A Disable.

3

General Characteristics

Physical….220mm x 177mm x

40.44mm.

Temp………..-37 to +74 degrees C.

Humidity…….5 to 95 % non-

condensing.

Power …….….+5 V @ 500ma

Data Rate……..0-115200 baud.

Data Format…Asynchronous, serial

by bit

DB9 Termination Table

Pin Function

1 DCD

2 RXD

3 TXD

4

5 SGND

6

7 RTS

8 CTS

9

DB15 Termination Table

Pin Signal PIN Signal

1 TXD+ 9 TXD-

2 IFC GND 10 IFC GND

3 TXC+ 11 TXC-


5 RXD+ 13 RXD-


7 RXC+ 15 RXC-

8 NC

96 pin connector Termination Table

Pin A B C

1 SPxTXD+

2 SPxTXD

3 SPxRXD+

4 SPxRXD

5 SPxRTS+ SPxTXCO+

6 SPxRTS SPxTXCO-

7 SPxCTS+ SPxTXCI+

8 SPxCTS SPxTXCI+

9 SPxDCD+ SPxRXC+

10 SPxDCD SPxRXC+

11 SPyTXD+

12 SPyTXD

13 SPyRXD+

14 SPyRXD

15 SPyRTS+ SPyTXCO+

16 SPyRTS SPyTXCO-

17 SPyCTS+ SPyTXCI+

18 SPyCTS SPyTXCI+

19 SPyDCD+ SPyRXC+

20 SPyDCD SPyRXC+

21 DCG #1 C50 EN

22

23 DCG #1

24

25

26

27 DCG #1 DCG #1 DCG #1

28 +12 SER -12 SER

29 +5 VDC +5 VDC +5 VDC

30 DCG #1 DCG #1 DCG #1

31

32

SPx/y refers to the controller port

based on which slot is being used.

Slot A1: x = SP3, y = SP4.

Slot A2-A5: x = SP1, y=SP2.

4

INSTALLATION

Prior to installation, the 2070-7A/B

must be configured to match the

system requirements. Access to the

two configuration switches is not

possible once the module has been

installed in to a 2070 controller.

After the configuration has been set,

install the 2070-7A/B in to the

controller.

While this can be performed with the

power on to the controller, it is

recommended that the power be first

turned off.

Then turn the power on if it was

previously turned off.

Configuration Switches

(Defaults are in bold)

(2070-7B only switches are

underlined)

Switch FUNCTION Off On

SW1.1 SP1 Disabled Enabled

SW1.2 SP1 485 Norm Invert

SW1.3 SP1 TXC Norm Invert

SW1.4 C21S TXC In Out

SW1.5 SP2 485 Norm Invert

SW1.6 SP2 TXC Norm Invert

SW1.7 C22S TXC In Out

SW1.8 RTS Control Enabled Disabled

SW1.1: Enable/Disable SP1 from

receiving data. When in disable

mode, a front panel indicator turns

on.

Because of legacy issues with traffic

controller hardware design, signals

on the backplane of the 2070

controller are inverted. The GDI

2070-7B has the flexibility to operate

in either the standard controller

(“Inverted”) or in a non-inverted

controller (“Normal”).

SW1.2: Controls the polarity of the

TXD/RXD signals.

SW1.3: 7B Only Controls the

polarity of the TXC/RXC

signals for SP1.


directionality of the TXC

signal for SP1. Determines

whether it is routed to TXCO

or TXCI.

SW1.5: Controls the polarity of the

TXD/RXD signals for SP2.


polarity of the TXC/RXC

signals for SP2.


directionality of the TXC

signal for SP2. Determines

whether it is routed to TXCO

or TXCI.

SW1.8: 7B Only In the “On”

position, RTS handshaking

is disabled. In the “Off”

position, RTS handshaking

is enabled.

For the 2070-7B, RTS Handshaking

dynamically controls the output of

TXD and TXCO. The controller must

assert RTS to output either signal.

5

ADJUSTMENTS

The 2070-7A/B does not need

adjusting. The only changes that

may be required are the polarity

switches. This will have to be

determined based on the controller

in use.

A factory test procedure with full

instructions on how to test and

setup the modem will be provided

on request.

6

THEORY OF OPERATION

Systems Description

The 2070-7A and 2070-7B plug in

modules extend the Interface bus of

the 2070 controller making it

accessible at the rear panel.

The 2070-7A translates the

differential signals to single ended

RS232 signals at the front panel DB9

connectors.

The 2070-7B translates the

differential signals to RS422 signals

at the front panel DB15 connectors.

All signals paths are optically

isolated. The power to the output

circuitry is isolated from the 2070

controller.

Both modules incorporate a state of

art PLD design that is used for

signal routing and functional

configuration.

7

Block diagram 2070-7A

8

Block diagram 2070-7B

9

2070-7A Detailed Description of

Circuit Operation

The 2070-7A consists of two

channels of serial communication

extension. Except for reference

designators and pin numbers, both

extension channels are identical in

operation.

Each channel of the 2070-7A,

extends the serial interface signals

that of the 2070 controller from the

backplane communication bus to a

DB9 connector on the front of the

unit. The EIA485 signals from SP1

and SP2 are converted to EIA232

signals and are routed to C21S and

C22S on the front panel.

The SP1TXD ± and SP1RTS ±

EIA485 signals are received from the

controller as differential (balanced)

signals which get converted to a

single ended signal by LTC488ISW

Line Receiver U14.

SP1TXD+ connects to positive input

pin2 (A+) and the SP1TXD signal is

connected to the negative input pin1

(A). SP1RTS+ connects to positive

input pin 14 (B+), and the SP1RTS

signal connects to negative pin15

(B).

The outputs (pin 3 & 13) of U14 have

positive polarity. These single

ended signals drive the optical

isolators U30 & U31 via the

NCHANNEL MOSFETs Q3 & Q6. The

N CHANNEL MOSFETs invert the

polarity to properly drive the

OPTOisolator internal LEDs. The

output of U30 & U31 (Pin6) connects

to the serial router and inversion

control logic U22. TXD connects to

U22 pin 92 and RTS connects to U22

pin 90.

U22 is a High–performance, low–

cost CMOS EEPROM–based

programmable logic device referred

to as a PLD. These devices are

“blank” when installed on the PCB,

and then programmed with the

functionality developed specifically

for this modem.

The SP1 TXD and SP1 RTS signals

are transmitted out of U22 pins 45

and 44 to U9 pins 12 and 11.

U9 changes the TTL signal level to

EIA232 signal levels and inverts the

polarity to meet EIA232 standards.

There are three EIA232 signals that

are inputs on C21S. DCD, CTS and

RXD are converted from EIA232

signal levels to TTL signal levels

before being presented to the Serial

Router Logic in U22.

DCD (C21S pin 1) is converted to

TTL and inverted using transistor

Q1. It is then connected to U22 pin

10.

CTS (C21S, pin 8) is converted to

TTL and inverted with U9. The

output of U9 (pin 10) is routed to U22

pin 8.

RXD (C21S, pin 2) is converted to

TTL and inverted with U9. The

output of U9 (pin 13) is routed to U22

pin 9.

10

Once again U22 inverts these

signals according to SP1485 INVERT

Switch (SW12).

The polarity adjusted signals for SP1

output U22 on Pins 69 (SP1_RXD),

71 (SP1_CTS), & 75 (SP1_DCD). The

SP1DCD signal drives the

OPTOisolator LED on U4 on Pin 3.

SP1CTS TTL signal drives the

OPTOisolator LED of U3 on Pin3.

SP1RXD TTL signal drives

OPTOIsolator U2 Pin3. The outputs

(pin6) of U2, U3, and U4 drive the

485 Transmitter U13 (LTC487ISW)

which converts these three signals

back to 485 differential pairs before

being transmitted back to the 2070

Controller on P1.

SP1 can be disabled by opening

dipswitch S1 Position 1. When

disabled the RED LED DS3 on the

front panel will be on, indicating SP1

is not in service (driven by U10

Pin8). When S1 Position1 is closed

(Enabled) U13 Pins 4 & 12 are driven

“HIGH” by U10, Pin6 to enable the

transmitter.

Serial Port2 can be disabled by the

2070 Controller using C50 signal on

P1, Pin B21. If C50 is “HIGH” then

U16 transmitter will be enabled by

U10 Pin12 switching “HIGH” to drive

U6 Output Enable Pins 4 & 12.

When installed, R53 configures U22

for 2070-7A operation. This resistor

is mutually exclusively installed with

R54. R54 configures U22 for 2070-

7B operation.

The DC to DC converters U18 (5V)

and U36 (3.3V) provide isolation

from the power source of the 2070

Controller as required. U18 provides

the ISOLATED 5Vdc power to the

OPTOIsolators and EIA232 Serial

Port Drivers. The 3.3V is the

isolated supply for U22.

11

2070-7B Detailed Description of

Circuit Operation

The 2070-7B functions the same as

the 2070-7A except that it does not

convert the EIA485 signals to

EIA232.

While the 2070-7B routes only TXD

and RXD to the front panel (No RTS,

CTS, or DCD), it extends the TX

clock and the RX clock signals to

the front panel for synchronous

communications.

Switches (S1.4 for ch1 and S1.7 for

ch2) are provided to change the

directionality of the TX Clock signal.

It can be routed to the TXCI or TXCO

pins of the 2070 controller

depending on the position of the

switches.

Instead of DB9 connectors on the

front panel, the 2070-7B has DB15

connectors. This is to provide

enough pins for the signals and

grounding of the EIA485 interface.

Each signal (TXD, TXD, TXC, and

RXC) is differentially configured

which means that it has a normal

signal but also a complimentary

signal has paired to it. There are

also a number of ground paths.

U9 of the 2070-7A, which is a

SP310AET TTL to EIA232 translator,

is replaced on the 2070-7B with a

LTC488 TTL to EIA485 line driver

(U24) and a LTC487 EIA485 to TTL

line receiver (U28).

The TXC signal at C21S is routed to

either TXCI or TXCO. The process

starts with U26. U26 is an LTC 491,

bidirectional TTL to EIA485

translator. While the EIA485

input/output of U26 are connected

together, the TTL input/outputs are

routed differently. The output

enable (OE) pins 3 and 4 control

which direction to process the

signal.

The output of U26 is routed through

the serial router and inversion

controller PLD U22 pin 19. It is

labeled “C21485_TXC_I/O”

indicating that it originates at C21, it

is a 485 path, the signal name is TXC

and it can be either an input or an

output.

The login inside of U22 monitors the

state of S1, pin 4. If it is 0vdc (low)

then, then pin 19 is connected to pin

93, SP1TXC0, which is driven from

the 2070 controller’s TXCO output.

If it is 3.3vdc (High), then pin 19 is

connected to pin 67, SP1TXCIISO,

which is sourced at the 2070

controllers TXCI input.

At the same time, U22, pin 46 is

switched to low, for TXCI, and high,

for TXCO. Thus enabling the correct

section of U26.

U11, another LTC491, is the

transceiver for TXCO and TXCI. But

because U22 is providing the routing

function, U11’s enable lines are

permanently set and are not

switched.

U35 opto isolates TXCO and U8 opto

isolates TXCI.

12

Wave Forms

(A5) RTS+

Differential Input

(A6) RTS

(A7) CTS+

Differential Input

(A8) CTS

(A1) TXD+

Differential Input

(A2) TXD

(A3) RXD+

Differential Input

(A4) RXD

13

(A9) DCD+

Differential Input

(A10) DCD

TP 17

Same polarity as DB9

TP 16

Same polarity as DB9

U14 Pin 3

RS485 Line Receiver Output

U30 Pin 3

OptoIsolator Input

14

U30 Pin 6

OptoIsolator Output

U9 Pin 12

PLD Output

U9 Pin 15

RS232 Line Driver Output

15

TXD

C21S Pin 1

RXD

TXD

C21S Pin 3

RXC

TXD

C21S Pin 3

RXC

TXCO

C21S Pin 3

TXCI

16

Voltage Measurements

All voltages are reference to the Isolated Ground (TP24).

For DC Isolated Models

TP Ref. Measurement tolerance

TP22 TP 24 3.3vdc ±.2vdc

TP9 TP 24 5vdc ±.6vdc

TP14 TP 8 5vdc ±.6vdc

Alignment Procedures

All alignment is performed at the factory. The modem is a single board

module and does not require further alignment.

GDI COMMUNICATIONS, LLC

GDI 2070-7A & 7B MANUAL

A01248 Rev. A

879 DEMING WAY SPARKS, NV 894316403

TELEPHONE: 7753458000 FAX: 7753458010

2070-7A/7B Manual - GDI Communications 2070-7A & 7B Manual A01248 Rev. C ... ELECTRICAL...

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Transcript of 2070-7A/7B Manual - GDI Communications 2070-7A & 7B Manual A01248 Rev. C ... ELECTRICAL...