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APPENDIX

Electronic Display Connections

When using SAEJ1708/ J1587 communication protocol the display requires four wires to

operate: two for power and two for the SAE J1587 databus. Pin assignments are shown

below.

When using SAEJ1939 communication protocol, again the display requires four wires to

operate: two for power and two for the J1939 databus. However the SAEJ1939 databus

connections are different to those of the SAEJ1587 databus. Pin assignments are shown

below:

Vehicle speed input from a GPS or speed transducer can be input to the display.

Note that pin 11 of the connector can be

used to drive an external alarm. To do

this, wire a switched +12 volt supply wire

to one side of the alarm, and the other to

pin 11 of the connector from the display.

The external alarm will activate whenever

the display alarm bleeps.

Connector pin out Signal Notes

1 Ground

2 Keyswitch

3 NMEA TX (+)

4 NMEA TX (-)

5 NMEA RX (-)

6 NMEA RX (+)

7 CAN LO (J1939 LO)

8 CAN HI (J1939 HI)

9 J1708/J1587+

10 J1708/J1587-

11 External Alarm Output

12 Not Used

15. GEM connection data - continued

Connector pin out Signal Notes

1 Ground

2 Keyswitch

3 NMEA TX (+)

4 NMEA TX (-)

5 NMEA RX (-)

6 NMEA RX (+)

7 C

AN LO

8 C

AN HI

9 J1708/J1587 +

10 J1708/J1587 -

11 External Alarm Output

12 Not Used

1 2 3 4 5 6 7 8 ... 12 13

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