CAI 700 NDIR, Operator'S Manual

Page: 146 / 205

700 NDIR Analyzer 6-20-2017
146
AK Protocol
Data Description
Each command begins with STX (Start of Text) in the first byte. The “don’t care” byte can be
any ASCII character. Generally, a blank space or an underscore ( _ ) is used to increase
readability. The four function bytes represent the AK command. A blank space comes next,
followed by K and the channel number. The analyzer is a single-channel device, and because of
that, the channel number is usually 0. For delimiting the command parameters from the channel
number, another blank follows. This may be followed by command parameters with variable
lengths. Every command ends with the ETX (End of Text) character. The Error Status byte does
not indicate the real number of errors. For Error Status, use the ASTF command.
Example: Using Windows
®
HyperTerminal for Serial RS232 Communications with CAI 700
Series Analyzers requires:
1. HyperTerminal Software
2. Windows PC/Laptop
3. Null Modem Cable
Setup Procedure: run HyperTerminal and configure as shown:
Other similar simple terminal programs should allow similar settings.