Protocol; Control; Communication Setting - Orion OLMU-K4953 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. MONITOR
RX DATA 2 2 TX DATA
TX DATA 3 3 RX DATA
GND 5 5
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7.2. Protocol Format
7.2.1 Send Protocol Format
STX COMMAND
STX MCMD SCMD
7.2.2 Receive Protocol Format
STX COMMAND
STX MCMD SCMD
* STX - 0x02, EXT - 0x03
7.2.3 Description of Protocol Format
ITEM DESCRIPTION
STX START OF CODE
MCMD MAIN COMMAND
SCMD SUB COMMAND
LEN LENGTH OF ID & DATA
GID
MID1 MONITOR ID (MSB)
MID2 MONITOR ID (LSB)
D1
Dn
CS
EXT END OF CODE
GND
LEN DATA
LEN GID MID1 MID2 D1
LEN DATA
LEN GID MID1 MID2 D1
VALUE SIZE
0x02 1 BYTE
VARIABLE 1 BYTE
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
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"