Transcription of Modbus Protocol Reference Guide - M-System - …
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Modbus Protocol Reference Guide - M-System - …
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) .. Single Coil (05) .. Single Register (06) .. (08) .. Communication Event Counter (11, 0x0B) .. Communication Event Log (12, 0x0C) .. Force Multiple Coils (15, 0x0F).
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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