ADLINK C485 - Manual (Page 48)

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• Expansion/Isolation Box User Guide
The pin definition for RS-422/485 DB25 male connector.
Pin No. RS-422/485 Mode Signal Name
2 TXD+ (Out)
3 RXD+ (In)
4 RTS+ (Out)
5 CTS+ (In)
7 GND
13 RTS- (Out)
14 TXD- (Out)
16 RXD- (In)
19 CTS- (In)
RS-485 mode may let pin 2 and pin 3, pin 14 and pin 16 short together to
connect with other device.
We have 120-ohm terminator resistor built in each input signal pair. In
RS-485 mode, you may need to remove this terminator resistor.
Mode setting for C584XB/C588XB
DIP Switch Bit 1,3,5,7 DIP Switch Bit 2,4,6,8 Interface Mode
ON ON RS-232
ON OFF RS-232
OFF ON RS-422
OFF OFF RS-485