Quatech SSCLP-300 - Manual (Page 43)

7.6 Termination Resistors
Line termination resistors are provided for the input signals of each of the
DSCLP-200/300's RS-422/485 ports. Termination may be selected or removed
for individual signal lines using jumper blocks J6-J9.
RS-422 Rt = 100 ohm 1/2W
RS-485 Rt = 120 ohm 1/2W
+
-
RS-422/485 Receiver
Rt
RXD+ AUXIN+
RXD- AUXIN-
or
RS-485 termination
(120 omhs)
RS-422 termination
(100 ohms)
(factory default)
no termination
Jumpers J6-J9
1 3
4 2
1 3
4 2
1 3
4 2
Figure 21 --- RS-422/485 Line termination resistance values
DSCLP/SSCLP-200/300 User's Manual 43