AC90SVHE-3 / AC100SVHE-3 Operations Manual....
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6.5.2 RS-485, 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 9 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 7 at the first and last device in daisy-chained RS-485 bus, but
remove the jumpers for any intermediately connected devices.
A master converter’s Node Id is factory set for 3; a slave converter’s is set for 4. These are the
default values for communication with ASEA Power Systems designed Touch Panel computers.
Additional slave converters can be set for Node Id numbers greater than 4 (5-8 recommended).
As ASEA Power Systems uses Node Id numbers 9-13 for GMM products, use of these should be
avoided.
