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8.6 Termination Resistors
Line termination resistors are provided for the input signals of each of the
DSC-200/300's RS-422/485 ports. Termination may be selected or removed for
individual signal lines using jumper blocks J1-J4.
RS-422 Rt = 100 ohm 1/2W
RS-485 Rt = 120 ohm 1/2W
+
-
RS-422/485 Receiver
Rt
RXD+ AUXIN+
RXD- AUXIN-
or
1
2
3
RS-485 termination
(120 omhs)
1
2
3
RS-422 termination
(100 ohms)
(factory default)
1
2
3
no termination
Jumpers J1-J4
Figure 25 --- RS-422/485 Line termination resistance values
Quatech DSC
-200/300 User
'
s Manual
34