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Message: <blockquote data-quote="imhotep" data-source="post: 24575160" data-attributes="member: 562115">RS-485 is just another serial comms interface , like the RS-232. Normal serial ports in computers and devices are RS-232. The main difference between the RS-232 and RS-485 are...RS-232 topology is a point to point protocol with a max distance of about 15m at 9600bpswhereas the RS-485 is a multi-point topology - You can connect several receivers and transmitters, usually up to 32 devices in a segment and can cover 1200m distance. Also RS-485 with 2 contacts operated in half duplex, with 4 contacts operate in full duplex.Usually these sensors are Modbus compatible, a very old protocol used in the PLC devices, originally developed by Modicon.Your sensor hardware manufacturer will possibly provide the comms software to read the data.</blockquote>

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