Protocol; Communication Setting; Protocol Format - Orion OLMU-K4940 User Manual

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
SPECIFICATION
ASYNCHRONOUS SERIAL COMMUNICATION
DAISY CHAIN
57600 bps
8
NONE
1
NONE
9PIN D-SUB, MALE / FEMALE STRAIT TYPE
PC PIN NO. PIN NO.
RX DATA 2 2
TX DATA 3 3
GND 5 5
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7.2. Protocol Format

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