AC08 and AC12 Operations Manual....
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6.4 REMOTE COMMUNICATIONS, cont.
6.4.2 RS-485/Modbus, cont.
All wiring between the converter’s RS-232C port and the Modbus Option converter/optical-isolator
is included and wired at the factory. RS-485 bus wiring between a master converter and slave
converter(s) and ultimately to the customer side connections is the responsibility of the customer.
Such wiring should be shielded as depicted in Figure 8 on the previous page.
Each converter/optical-isolator contains terminating jumpers used to link the T1 and T2 terminals to
the B and A terminals, respectively, and provide internal terminating resistances. Install such
jumpers as indicated in Figure 8 at the first and last device in daisy-chained RS-485 bus, but remove
the jumpers for any intermediately connected devices.
A converter’s Node Id is factory defaulted to 3; an additional converter, or slave converter in a
parallel set, should be set to Node Id 4. These are the default values for communication with ASEA
Power Systems designed Touch Panels. As ASEA Power Systems uses Node Id numbers 9-13 for
GMM products, use of these should be avoided.
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