CEStronics AccessOne TSG8 Assembly And Operating Manual page 12

5.1.3 RS232
No. Connection
1 RX
2 TX
3 GND
5.1.4 Power
No. Connection
1 +12 V DC
2 Shield
3 GND
4 AC fail (low active)
5 Battery low (low active)
6 GND
+12 V DC
7
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Function
Receive data cable for outgoing data (negative logic)
Transmit data cable for outgoing data (negative logic)
Ground. The signal voltages are measured against this cable.
Function
Power supply
Ground. The signal voltages are measured against this cable.
Ground. The signal voltages are measured against this cable.
Power supply