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Technical Information
Communications Protocol
This section defines the technical specifications for the RS-232 protocol used with
the leak detector and describes the customer-configured inputs/output.
This section defines the technical specifications for the RS-232 protocol used with
the leak detector and describes the customer-configured inputs/outputs.
Protocol (RS-232)
S-232 ports operate at 9600 baud, 8 bits, no parity, and one stop bit.
All characters transmitted to the leak detector are echoed by the leak detector.
Commands, inquiries, and strings of both commands and inquiries must be
terminated by a carriage return <CR>; the carriage return is echoed as a space
character.
The maximum length of the input is 80 characters; if no carriage return has been
received before the 80th character, execution of the command string begins
anyway. Words that begin with:
? are inquiries for the controlling device to determine the current state or value
of a leak detector parameter.
PUT- are commands for the controlling device to set the current state or value
of a volatile leak detector parameter.
INIT- are commands for the controlling device to set non-volatile leak detector
parameters.
Other commands do not require a parameter and do not begin with any special
characters.
Successful inquiries respond with data, followed by a space, then: ok<CR><LF>, as
specified in the tables of this appendix. Unsuccessful inquiries respond with the
offending inquiry followed by a space, then: #?<CR><LF> (line feed, <LF>).
Inquiries, parameters, and commands can be concatenated. Each word or numeric
parameter is followed by one or more spaces. The string is terminated by a <CR>,
which causes execution to begin.
Successful strings respond with the specified data for the input inquiries in the
order the inquiries were issued, followed by: ok<CR><LF>.
Unsuccessful strings respond with the first offending command followed by a
space, then: #?<CR><LF>. All commands and inquiries following the failed word are
ignored; all parameters are discarded.
Tables 16-17-18-19 outline the available control and query commands.
Agilent Helium Leak Detector User Manual
143
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