36 Device Description
WAGO-I/O-SYSTEM 750
750-8207 PFC200 CS 2ETH RS 3G
Manual
Draft version 1.2.1 from 2017-09-13, valid from FW Version 02.06.20(09)
3.3.6.1 Operating as an RS-232 Interface
Depending on the device type DTE (e.g., PC) or DCE (e.g., PFC, modem), the
RS-232 signals have different data directions.
Table 10: Function of RS-232 Signals for DTE/DCE
Contact
Signal
Data Direction
DTE
DCE
2
RxD
Input
Output
3
TxD
Output
Input
5
FB_GND
---
---
7
RTS
Output
Input
8
CTS
Input
Output
For a DTE-to-DCE connection, the signals are connected directly (1:1).
Figure 9: Termination with DTE-DCE Connection (1:1)
For a DTE-to-DTE connection, the signal connections are crossed.
Figure 10: Termination with DTE-DTE Connection (Cross-Over)
