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To have a sensor successfully interfaced with a datalogger, the communication protocol and physical specification have to match in both devices. In the computer world, a communication protocol is the language used by two devices to speak to each other. Morse code is the oldest digital communication protocol invented. There are a number of standard communication protocols today including Modbus and DNP3 among others. Modbus and DNP3 have special instructions in the datalogger, and these instructions should be used if the sensor supports it. Many sensor manufacturers use their own protocol. If the protocol is known, the datalogger can be programmed to emulate it. However, writing your program can be time consuming. This document will help with implementing nonstandard serial protocols.
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