Touchpoint 4 Serial Communication Protocol Issue 1 09/07
CONTENTS
INTRODUCTION
1
OVERVIEW
1
GLOSSARY
2
COMMUNICATION PORT
2
ADDRESS SETTING PROCEDURE
3
PROTOCOL SPECIFICS
3
Packet Length
4
Checksum
4
ACK/NAK Handshake
5
TIME DIAGRAM
6
PROTOCOL PACKET DEFINITION
6
PACKET FORMAT
6
Start Code
6
Slave Address
6
Length
6
Command
6
Data
7
Checksum
7
GENERIC DATA FORMATS
7
Date Format
7
Time Format
7
Date/Time Examples:
7
Concentration Code:
7
Concentration Data Format Code
8
Concentration Example:
8
GENERIC RESPONSES
8
ACK - 0x01
8
NAK - 0x21
9
Bad Packet - 0x66
9
Unknown CMD –0x67
9
PROTOCOL COMMAND DEFINITION
9
HANDSHAKE COMMAND – 0X40
9
Command packet to instrument:
9
Example:
9
Response packet from instrument:
9
Example:
9
GET UNIT AND POINTS STATUS - 0X30
10
Command packet to instrument:
10
Example:
10
Response packet from instrument:
10
Example:
11
