CAI 600-NDIR, User Manual

Page: 74 / 86

Section 12 Model 601/601P/602/602P/603 NDIR Analyzer
California Analytical Model 600_NDIR_Series_v10.0 CE Operators Manual
Page 74 of 86
12.3. Protocol Description
12.3.1. Instruction command
Character Explanation
1
st
Byte STX ASCII code 02
2
nd
Byte Don’t Care Any ASCII code
3
rd
Byte Function Code 1
4
th
Byte Function Code 2
5
th
Byte Function Code 3
6
th
Byte Function Code 4
AK instruction
e.g.: ASTF
7
th
Byte Blank
8
th
Byte K
9
th
Byte 0
10
th
Byte Blank
D
A
T
A
AK instruction parameters,
length is variable
nth Byte ETX ASCII code 03
Table 12-1 Structure of an instruction command
12.3.2. Acknowledgement command
Character Explanation
1
st
Byte STX ASCII code 02
2
nd
Byte Don’t Care Any ASCII code
3
rd
Byte Function Code 1
4
th
Byte Function Code 2
5
th
Byte Function Code 3
6
th
Byte Function Code 4
Echo of the AK instruction
command
7
th
Byte Blank
8
th
Byte K
9
th
Byte 0
10
th
Byte Blank
D
A
T
A
AK acknowledgement
parameters, length is variable
nth Byte ETX ASCII code 03
Table 12-2 Structure of an acknowledgement command