Quatech DSCLP-300, SSCLP-300 Termination Resistors, RS-422/485 Line termination resistance values

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
+		RXD+	AUXIN+
	Rt		or
-		RXD-	AUXIN-

Jumpers J6-J9

2	4	2	4	2	4
1	3	1	3	1	3
	no termination	RS-422 termination		RS-485 termination
			(100 ohms)		(120 omhs)

(factory default)

Figure 21 --- RS-422/485 Line termination resistance values

DSCLP/SSCLP-200/300 User's Manual 43