Macurco MRS-485 Modbus RS-485 Adapter
REV – 1.0
[34-2900-0019-7]
10
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P a g e
3.3
Connection
The Macurco BRS-485 output is connected via a four-terminal screw type connector. The BRS-485 adapter is
wired in the standard 2W-Modbus circuits definition with selectable built-in terminating resistors at the ends of
the RS-485 bus. The power for the BRS-485 adapter is connected via a two-terminal screw type connector, 12 to
24 VAC or 12 to 24 VDC and no polarity.
Note
: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not
recommended as there may be interference from the high voltages. Line polarization should not be required for
the BRS-485 but may be required for other devices on the RS-485 line - see manufacturer’s directions.
Figure 3-2 Connection Expanded