Ecotech Acoem Serinus 30 - Appendix A. Advanced Protocol; A.1 Command Format

Serinus® 30 User Manual 3.3
Page 202
Appendix A. Advanced Protocol
The Advanced protocol allows access to the full list of instrument parameters.
A.1 Command Format
All commands and responses sent to and from the Instrument will be in the following packet format
to ensure data is reliable.
Table 27 – Packet Format
1
2
3
4
5
6 … 5+n
6+n
7+n
STX (2)
Serial ID
Command
ETX (3)
Message
Length (n)
Message
Checksu
m
EOT (4)
Where:
<STX> ASCII Start of Text = 0x02 hex.
Serial ID The Serial ID assigned in the Main Menu → Communications Menu →
Serial Communication Menu.
<ETX> ASCII End of Text = 0x03 hex.
Checksum The XOR of the individual bytes except for STX, ETX, EOT and Checksum.
Message length Must be in the range 0 - 32. Responses from the instrument can have a
message Length of 0 - 255.
<EOT> ASCII End of Transmission = 0x04 hex.
Examples
A basic request for Primary gas data would be as follows:
Table 28 – Example: Primary Gas Request
Byte
Number
1
2
3
4
5
6
7
8
Descripti
on
STX
ID
Comman
d
ETX
Message
Length
Primary
Gas Conc
Checksu
m
EOT
Value
2
0
1
3
1
50
50
4
Checksu
m
Calculati
on
0
01=1
11=0
050=50
50
And a sample response: