FEC AFC1500 - Manual (Page 35)

PE PE Earth Ground Shield
RBST Pin 9
/DI2 RXD- Pin 7
/DO2 TXD- Pin 6
Pin 4
ISOGND Isolated Ground Pin 3,5
DI2 RXD+ Pin 2
DO2 TXD+ Pin 1
InterBus connectors- BUS OUT
Termination
Always terminate RBST to ground if it is not the last module on the bus. If
the RBST is not connected to ground, the interface will automatically
terminate the bus.
Chapter 3: Control Interfaces
35