Modbus Protocol Reference Guide - M-System
1Modbus Protocol Reference GuideEM-5650 Protocol Reference GuideContents1. Introduction ........................................ ........................................ ................. 42. Modbus Protocol ........................................ ........................................ ........ Description ........................................ ........................................ ..................................... Message Framing ........................................ ........................................ .......................... 5ASCII Framing ........................................ ........................................ ....................................... 5RTU Framing ........................................ ........................................ ........................................ .. 5Address Field ........................................ ........................................ ........................................ . 5Function Field.
Standard Code for Information Interchange) or RTU (Remote Terminal Unit). The mode must be the same for all devices on a Modbus network. In ASCII mode, each 8-bit byte in a message is sent as two ASCII characters. In RTU mode, each 8-bit byte in a message contains two 4-bit hexadecimal characters.
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