Rs232 Connector; Rs485/422 Connector; Connection Of Rs485 Connector; Connection Of Rs422 Connector - Advantech SmartFlex SR309 User Manual

Connection of RS485 connector:

Pin Signal
1 TxRx+
2 TxRx-
3 TxRx+
4 TxRx-
The termination resistor can be activated directly on the port board using a jumper (termination
resistor is part of the port board).

Connection of RS422 connector:

Pin Signal
1 RxD+
2 RxD-
3 TxD+
4 TxD-
The selection of either RS485 or RS422 can be performed by using jumpers on the
board. The points where jumpers have to be mounted are shown on the port (see the fig-
ure below). Three jumpers are required for the RS485 interface or one jumper for the RS422
interface. The default configuration is RS485 with termination off.
Figure 31: RS232 connector
Description
RS485 B (+)
RS485 A (-)
RS485 B (+)
RS485 A (-)
Table 18: Connection of RS485 connector
Description
RS422 (+)
RS422 (-)
RS422 (+)
RS422 (-)
Table 19: Connection of RS422 connector
Figure 32: RS485/422 connector
32
SmartFlex SR309
Direction
Input/Output
Input/Output
Input/Output
Input/Output
Direction
Output
Output
Input
Input