Rs232-Rs485/422 Interface; Version With Rs232-Rs485/422 Interface; Rs232 Connector; Connection Of Rs232 Connector - Advantech SmartFlex SR307 User Manual

5.9.2 RS232-RS485/422 interface

These interfaces are physically connected through the 5-pin and 4-pin terminal block con-
nectors. The insulation strength is up to 2.5 kV. Attention, connectors are not isolated from
each other! No state indication is displayed for this interface. These router versions comply
with the standards and temperature ranges stated in Chap. 7.1.
Figure 46: Version with RS232-RS485/422 interface

Connection of RS232 connector:

Pin Signal
1 CTS
2 RTS
3 GND
4 RXD
5 TXD
Both connectors (RS232 and RS485/422) have a common ground connection.

Connection of RS485 connector:

Pin Signal
1 TxRx-
2 TxRx+
3 TxRx-
4 TxRx+
Description
Clear To Send
Request To Send
Signal ground
Receive Data
Transmit Data
Table 21: Connection of RS232 connector
Figure 47: RS232 connector
Description
RS485 B (-)
RS485 A (+)
RS485 B (-)
RS485 A (+)
Table 22: Connection of RS485 connector
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SmartFlex SR307
Direction
Output
Input
—
Input
Output
Direction
Input/Output
Input/Output
Input/Output
Input/Output