Stanford Research Systems RGA100, Руководство по эксплуатации и программированию

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RGA Command Set 6-29
SRS Residual Gas Analyzer
RGA Command Set
This section lists and describes the commands of the RGA’’s Command Set. The
commands are separated into several lists, based on their functions. They are each
identified by a
header that describes the command’’s syntax (with the acceptable
parameter values), the command’’s function, and the information returned ( Echo ) to the
computer during execution.
The RGA commands are ASCII character strings consisting of a two letter (case
insensitive)
command name , a parameter , and a carriage return terminator .
Note: The carriage return character, decimal ASCII value=13, is represented throughout
this manual with the symbol <CR> . All command strings must be terminated with this
character in order to be acknowledged by the RGA.
The two letter mnemonic in each command sequence specifies the command name. The
rest of the sequence consists of parameters. Three types of parameters are allowed:
numbers, asterisk (default param), and question mark (query). Not all commands accept
all types of parameters, and some need no parameters at all.
In general, number parameters can be real or integer; however, some commands will only
accept integers. Commands that accept only integers are recognized because the numbers
used to specify their parameter range do not have a fractional part.
The maximum mass number recognized by the RGA is model dependent and is
represented by
M_MAX : 100 for the RGA100, 200 for the RGA200, and 300 for the
RGA300.
With a few exceptions, the data returned by most query commands is a string of ASCII
characters terminated by a linefeed (<LF>, decimal ASCII value=10) and a <CR>
terminator: string<LF><CR>
.
Ion currents are represented as integers in units of 10
-16
Amps, and transmitted directly in
Hex format: four byte integers, 2’’s complement format, Least Significant Byte first.