AC90SVHE-3 / AC100SVHE-3 Operations Manual....
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6.5.2 RS-485/Modbus
If included in the converter, a Modbus Option converter/optical-isolator will be located above the
RS-232C serial port (see Figure 6 on page 21).
The Modbus Option included converter/optical-isolator connections are depicted in Figure 9
below.
FIGURE 9 RS-485 CONNECTIONS