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

Technical specification of Ethernet IEEE 802.3:
Ethernet interface, IEEE 802.3 standard
Maximum data rate
Max. total cable length (300 Bd, 200 nF/km)

5.10.2 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 41: Version with RS232-RS485/422 interface
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 Signal
1 CTS
2 RTS
3 GND
4 RXD
5 TXD
Both connectors (RS232 and RS485/422) have a common ground connection.
Table 20: SWITCH interface parameters
Description
Clear To Send
Request To Send
Signal ground
Receive Data
Transmit Data
Table 21: Connection of RS232 connector
32
SmartFlex SR304
100 Mbps
100 m
Direction
Output
Input
—
Input
Output