B

Table B-1. Pinouts of the Serial Port

Pin Number

Signal

Description

1

Shield

ChassisGround (optional)

2

TXD

TransmitData(output)

3

RXD

Receive Data (input)

7

Common

SignalGround

(allothers)

 

Unused

 

Serial Cable

A serial cable is needed to connect the GSM to the Ethernet Interface. The next two figures illustrate typical cable connection of a personal computer. Figure B-1 shows connections to a personal computer with a 25±pin serial port and Figure B-2 shows connections to a personal computer with a 9-pin serial port..

25-PIN

SERIAL PORT

ON

PERSONAL COMPUTER

 

PIN

RXD

* 3

TXD

* 2

GND

7

RS-232 CABLE

PIN

2TXD

3RXD

7 GND

9-PIN MALE

a45181

ETHERNET INTERFACE MODULE SERIAL

PORT

9-PIN

FEMALE

25-PIN MALE

25-PIN FEMALE

*THE PINS AND CONNECTOR MAY BE DIFFERENT FOR SOME COMPUTERS OR TERMINALS, BUT THE SIGNAL NAMES WILL BE THE SAME. CONSULT THE MANUAL FOR YOUR COMPUTER OR ASCII TERMINAL FOR THE CORRECT SIZE CONNECTOR AND PIN NUMBERS.

Figure B-1. Serial Cable to Connect GSM (25±Pin Connector) to Ethernet Interface

9-PIN

SERIAL PORT

ON

PERSONAL COMPUTER

9-PIN MALE

 

 

PIN

 

RXD

* 2

 

 

TXD

* 3

 

GND

* 5

 

 

 

9-PIN

FEMALE

RS-232 CABLE

PIN

2TXD

3RXD

7 GND

9-PIN MALE

a45182

ETHERNET INTERFACE MODULE SERIAL PORT

9-PIN

FEMALE

*THE PINS AND CONNECTOR MAY BE DIFFERENT FOR SOME COMPUTERS OR TERMINALS, BUT THE SIGNAL NAMES WILL BE THE SAME. CONSULT THE MANUAL FOR YOUR COMPUTER OR ASCII TERMINAL FOR THE CORRECT SIZE AND PIN NUMBERS.

Figure B-2. Serial Cable to Connect GSM (9±Pin Connector) to Ethernet Interface

Display Terminal Settings

When used as a local Station Manager terminal, set the terminal to ªWrap-Aroundº mode. This prevents loss of information in the event a Station Manager command response exceeds the display line width of the terminal.

B-2

TCP/IP Ethernet Communications User's Manual ± January 1996

GFK-1004B

Page 217
Image 217
GE GFK-1004B Serial Cable, Display Terminal Settings, Table B-1. Pinouts of the Serial Port, Pin Number Signal Description