Orion OLMU-K4650, User Manual

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7. PROTOCOL
■ Introduction
- This document contains the communication PROTOCOL between LCD and its control devices
for better use.
- It focuses on the brief functional explanation and communication protocol without detailed
technical matters.
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7. 1. Communication Setting
ITEM SPECIFICATION
TRANSMISSION & RECEPTION TYPE ASYNCHRONOUS SERIAL COMMUNICATION
CONNECTION TYPE DAISY CHAIN
BAUD RATE 57600 bps
DATA BITS 8
PARITY NONE
STOP BITS 1
FLOW CONTROL NONE
CABLE & PIN ASSIGN
9PIN D-SUB, MALE / FEMALE STRAIT TYPE
PC PIN NO. PIN NO. MONITOR
RX DATA 2 2 TX DATA
TX DATA 3 3 RX DATA
GND 5 5 GND
7. 2. Protocol Format
* STX - 0x02 , EXT - 0x03
STX START OF CODE 0x02 1 BYTE
MCMD MAIN COMMAND VARIABLE 1 BYTE
SCMD SUB COMMAND VARIABLE 1 BYTE
LEN LENGTH OF ID & DATA VARIABLE 1 BYTE
GID GROUP ID VARIABLE 1 BYTE
ID = 0 :
ALL MONITOR(BROADCAST) MID1 MONITOR ID (MSB) VARIABLE 1 BYTE
MID2 MONITOR ID (LSB) VARIABLE 1 BYTE
D1 FIRST DATA VARIABLE 1 BYTE
DATA : n BYTE
Dn nTH DATA VARIABLE 1 BYTE
CS CHECKSUM VARIABLE 1 BYTE SUM = "FF“
EXT END OF CODE 0x03 1 BYTE
2.1 Send Protocol Format
2.3 Description of Protocol Format
STX COMMAND LEN DATA EXT
STX MCMD SCMD LEN GID MID1 MID2 D1 … Dn EXT
STX COMMAND LEN DATA CS EXT
STX MCMD SCMD LEN GID MID1 MID2 D1 … Dn CS EXT
2.2 Receive Protocol Format
Infinitely Expandable
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MLCD
ITEM DESCRIPTION VALUE SIZE REMARK