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G-858BP Backpack Mag Operators Manual

I/O Connector Pinout

There are 3 inputs on the I/O connector which simulate END LINE, MARK and ENTER key

presses. Momentarily connecting the corresponding pin to pin 4 is equivalent to pressing the key on the

keypad:

Number

Function

1 Ground

2 RS-232 Receive

3 RS-232 Transmit

4 Ground

5 Mark

6 Audio

7 Line

8 Enter

I/O connector on console:

768

543

Power Connector Pinout

If more that COM1 serial port is to be logged, COM2, COM3 and COM4 are presented on the

Power Connector.

Number

Function

1 +28V

2 +28V

3 COM4-RXD

4 COM3-RXD

5 COM2-RXD

6 COM3-TXD

7 COM2-TXD

8 GROUND

9 GROUND

Power Connector on console:

Some care needs to be exercised in the design of the external cables. The G859's COM1

connector's ground pin is internally connected to the ground on the power connector. If the external

cables also connect COM1 connector's ground to the power connectors ground, a loop will result. This

loop will appear asa shorted turn of copper wire to the EM-61. Depending on the cross section of this loop

Geometrics G-858BP User Manual

Questions and Answers: