Quatech Asynchronous Communications Adapter for PCI bus DSCLP/SSCLP-100 User Manual download pdf (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

RXD+ AUXIN+

RXD- AUXIN-

RS-485 termination

(120 omhs)

RS-422 termination

(100 ohms)

(factory default)

no termination

Jumpers J6-J9

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

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Quatech Asynchronous Communications Adapter for PCI bus DSCLP/SSCLP-100 User Manual Page 43