TSI Instruments SIZER 3321, User Manual

Page: 67 / 101

Using Serial Data Commands C-3
C o m m a n d s
The Model 3321 APS
™
spectrometer uses an ASCII-based
communications protocol that uses the RS-232 port of a computer to
transmit commands in the form of strings.
The four types of commands are:
 Set commands, which set all the operating parameters for the APS
™
spectrometer
 Action commands, which control mechanical components of the APS
™
spectrometer
 Read (polled) commands, in which the APS
™
spectrometer sends data
in response to a specific request from the computer
 Unpolled commands, in which the APS
™
spectrometer automatically
outputs data records at specific intervals.
No line-feed characters are transmitted. Either the requested data or an
"OK" is returned if the command is understood. The word “ERROR” is
returned if the command is not understood or if the command has an
invalid parameter.
Note : All characters must be UPPERCASE.
The following tables (Figure C-2) provide a quick reference to all the serial
commands. Command definitions, syntax, and examples begin after the
tables. Directions for issuing commands and troubleshooting commands
are provided at the end of this section.
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