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Modbus Protocol Reference Guide - M-System - …
www.m-system.co.jpEM-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)