UNO-2172 User Manual
10
2.3.5 RS-232/422/485 Selection
COM3 and COM4 support 9-wire RS-232, RS-422 and RS-485 inter-
faces. The system detects RS-422 or RS-485 signals automatically in RS-
422/485 mode.
To select between RS-422/485 and RS-232 for COM3, adjust CN24.
To select between RS-422/485 and RS-232 for COM4, adjust CN25.
Jumper setting for RS-422/485 interface: (Default setting). (CN24/CN25)
Figure 2.3: RS-422/485 Jumper Setting
Jumper setting for RS-232 interface: (CN24 and CN25)
Figure 2.4: RS-232 Jumper Setting
Pin
Description
1-2
TX+/TX- for COM3
Data+/Data- for COM3
3-4
RX+/RX- for COM3
5-6
TX+/TX- for COM4
Data+/Data- for COM4
7-8
RX+/RX- for COM4