NB3710 Extension Port

The NB3710 has an M12 extension connector with 8 pins. The 8 pins are split into two logical ports: pins 1 to 4 represent Extension Port 1 (EP1) and pins 5 to 8 represent Extension Port 2 (EP2). In common, EP1 hosts the serial conslole of the router which corresponds to a 3-wire RS-232.

Some NB3700 variants use the Digital I/O connector as extension connector. The same pin assignment applies for these variants.

NB3710 Extension Connector PIN Assignment

PinPortBaseAudio (A)CAN (C)IBIS (I)RS-485 (Sa)RS-232 (S)
1 EP1 RS-232 GND RS-232 GND RS-232 GND RS-232 GND RS-232 GND RS-232 GND
2 EP1 RS-232 TxD RS-232 TxD RS-232 TxD RS-232 TxD RS-232 TxD RS-232 TxD
3 EP1 RS-232 RxD RS-232 RxD RS-232 RxD RS-232 RxD RS-232 RxD RS-232 RxD
4 EP1 - - - - - -
5 EP2 - Input Left Ch. + GND WBSD (Signal Call/Aufrufbus) RS485 GND 2nd RS-232 GND
6 EP2 - Input Left Ch. - L WBMS (GND Call/Aufrufbus) RS485 TxD-/RxD- (A) 2nd RS-232 TxD
7 EP2 - Output Left Ch. + H WBED (Signal Reply/Antwortbus) RS485 TxD+/RxD+ (B) 2nd RS-232 RxD
8 EP2 - Output Left Ch. - - WBME (GND Reply/Antwortbus) - -

M12 Extension Connector

M12 Extension Connector