7.4.2.10 RS-485 bias and termination settings
A 6 x DIP switch is located on the COM1004...COM1005 cards. The COM card needs
to be pulled out from the relay case to access the switch. See
Figure 103
for
the location of the switch. RS-485 biasing and termination settings are possible
through this switch. If the switch is in “OFF” position, bias and termination are
disabled and in “ON” position, they are enabled.
Figure 103: DIP switches on the COM1004...COM1005 cards
Table 22: Bias and termination DIP switch
Switch Signal X8 pin Type
1 RS485_A1/+ 8 Bias
2 RS485_A1/+
RS485_B1/-
Bus termination
3 RS485_B1/- 7 Bias
4 RS485_A2/+ 10 Bias
5 RS485_A2/+
RS485_B2/-
Bus termination
6 RS485_B2/- 9 Bias
1MRS759118 D Commissioning
REX640
Operation Manual
125
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