Rs232-Rs485/422 Interface; Version With Rs232-Rs485/422 Interface; Rs232 Connector; Connection Of Rs232 Connector - Advantech SmartFlex SR304 Hardware Manual

3. Router Design

3.10.2 RS232-RS485/422 Interface

These interfaces are physically connected through the 5-pin and 4-pin terminal block connectors. 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. 5.1.
When connecting counterpart terminal block connectors (included in package with the router), use cables
with nominal cross section 0.2 to 1.0 square mm (30 to 16 AWG). Recommended stripping length is 5 mm.
For M2 captive screws the screw driver 0.5 x 3 mm is recommended. Tighten the screws with 0.3 Nm
torque.

Connection of RS232 connector:

Pin
1
2
3
4
5
Both connectors (RS232 and RS485/422) have a common ground connection.
SmartFlex SR304 Hardware Manual
Figure 42: Version with RS232-RS485/422 interface
Figure 43: RS232 connector
Signal Description
CTS Clear To Send
RTS Request To Send
GND Signal ground
RXD Receive Data
TXD Transmit Data
Table 21: Connection of RS232 connector
3.10 Interfaces Description
Direction
Output
Input
—
Input
Output
28