Protocol; Communication Setting; Protocol Format - 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.

7.1. Communication Setting

ITEM
TRANSMISSION & RECEPTION TYPE
CONNECTION TYPE
BAUD RATE
DATA BITS
PARITY
STOP BITS
FLOW CONTROL
CABLE & PIN ASSIGN
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SPECIFICATION
ASYNCHRONOUS SERIAL COMMUNICATION
DAISY CHAIN
57600 bps
8
NONE
1
NONE
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

2.1 Send Protocol Format
STX COMMAND LEN
STX MCMD SCMD LEN GID
2.2 Receive Protocol Format
STX COMMAND LEN
STX MCMD SCMD LEN GID
* STX - 0x02, EXT - 0x03
2.3 Description of Protocol Format
ITEM DESCRIPTION
STX START OF CODE
MCMD MAIN COMMAND
SCMD SUB COMMAND
LEN LENGTH OF ID & DATA
GID GROUP ID
MID1 MONITOR ID (MSB)
MID2 MONITOR ID (LSB)
D1 FIRST DATA
Dn nTH DATA
CS CHECKSUM
EXT END OF CODE
MLCD
Infinitely Expandable
DATA EXT
MID1 MID2 D1 ... Dn EXT
DATA CS
MID1 MID2 D1 ... Dn CS
VALUE SIZE REMARK
0x02 1 BYTE
VARIABLE 1 BYTE
VARIABLE 1 BYTE
VARIABLE 1 BYTE
VARIABLE 1 BYTE
ID = 0 :
VARIABLE 1 BYTE ALL MONITOR(BROADCAST)
VARIABLE 1 BYTE
VARIABLE 1 BYTE
DATA : n BYTE
VARIABLE 1 BYTE
VARIABLE 1 BYTE SUM = "FF"
0x03 1 BYTE
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