Transcription of Modbus Protocol Reference Guide - M-System - Total ...
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1 Modbus Protocol Reference GuideEM-5650 Protocol Reference GuideContents1. Introduction .. 42. Modbus Protocol .. Description .. Message Framing .. 5 ASCII Framing .. 5 RTU Framing .. 5 Address Field .. 5 Function Field .. 5 Data Field .. 5 Error Checking Field .. 6 LRC Checking .. 6 CRC Checking .. Modbus Function Formats .. 7 Data Address .. 7 Coil .. 7 Input Status .. 7 Input Register .. 7 Holding Register .. Contents in Modbus Messages ..83. Modbus Function Codes .. Coil Status (01) .. Input Status (02) .. Holding Register (03) .. Input Register (04).
EM-5650 Rev.10 Modbus Protocol Reference Guide 5 2.2 Modbus Message Framing ASCII Framing In ASCII mode, messages start with a ‘colon’ ( : ) character (ASCII 0x3A), and end with a ‘carriage return – line feed’ (CRLF)
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