TCW242-S_R1.0 – July 2021
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The maximum cable length should be up to 30 meters.
6.2.4.
RS-485 connection
RS-485 interface is non-isolated from the power supply.
Up to 24 MODBUS RTU sensors can be connected to TCW242-S. The device supports Teracom
and third-party sensors.
Connections can be realized by a standard RJ-45 connector. The used pinout is the one
recommended in the document “MODBUS over Serial Line Specification and Implementation
Guide” available on www.modbus.org.
It is mandatory to use 120ohms line terminators at both ends of the bus. TCW242-S incorporates
one of the terminators and should be placed at one end. So the client should only take care of
terminating at the other end of the line.
It is strongly recommended using “daisy-chained” (linear topology) for multiple sensors:
It is recommended to use only UTP/FTP cables and keep the total cable length up to 30 m,
although functionality has been achieved on a longer distance.
Summary of Contents for TCW242-S
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