Chapter 1. Installation
5
RS-485 Setup (Optional)
READ THIS FIRST
— The “RS-232/485” connector (also referred to as “COM2”) is factory-configured for RS-232 communication; this makes
it compatible with an RP240 remote operator panel. If you are not using RS-485 communication, skip this section and proceed to Mounting.
Caution —
Remove power before removing the 6K controller’s enclosure.
While handling the 6k controller’s printed circuit assemblies, be sure to observe proper grounding
techniques to prevent electrostatic discharge (ESD).
DIP Switch
RS-485 2-
Wire
RS-485 4-
Wire
RS-232
8 2-wire
RS-485
ON
OFF
OFF
7 4-wire
RS-485
OFF
ON
OFF
6
Reserved
OFF OFF OFF
5
Enable
RS-485
ON ON OFF
4 120
Ω
Rx termination resistor
ON *
ON
OFF
3 120
Ω
Tx termination resistor
ON *
ON
OFF
2 681
Ω
Tx+ bias resistor
ON ON OFF
1 681
Ω
Tx- bias resistor
ON ON OFF
* For 2-wire RS-485, use switch #3 or switch #4 for 120
Ω
termination (not both).
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