Xylem CL500 ONLINE CHLORINE ANALYZERS MODBUS User Manual
Page 5
2.1 RS-485 Connection
The RS-485 half-duplex (2-wire) digital interface operates with differential levels that are
not susceptible to electrical interferences. This is why cable lengths up to 3000 ft can be
implemented. The last device on every bus may require a 120-ohm termination resistor to
eliminate the possibilities of signal reflection on the line. Do not run RS-485 cables in the
same conduit as power.
Ensure each instrument is not powered when connecting the RS-485 line. To prevent
damage to the instrument, ensure that power is disconnected prior to making connections.
CL500 Modbus (3/09)
Rev. 1.3
3
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