Rs-485 Bus Connection; Bus Termination - Trane TR200 Instruction Manual

How to Operate the Frequency Converter

RS-485 Bus Connection

One or more frequency converters can be connected
to a controller (or master) using the RS-485 standard
interface. Terminal 68 is connected to the P signal (TX
+, RX+), while terminal 69 is connected to the N signal
(TX-,RX-).
If more than one frequency converter is connected to
a master, use parallel connections.
Figure 5. 1: Connection example.
In order to avoid potential equalizing currents in the screen, earth the cable screen via terminal 61, which is
connected to the frame via an RC-link.

Bus termination

The RS-485 bus must be terminated by a resistor network at both ends. If the drive is the first or the last device
in the RS-485 loop, set the switch S801 on the control card for ON.
Switches S201, S202, and S801
For more information, see the paragraph .
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