Using Serial Data Commands C-5
Set Co m m ands
Set commands allow you to set up operating parameters for the Model
3321. If a set command is sent with no parameter, the current parameter is
echoed.
Note: Some of the commands directly affect or are affected by other
commands. Refer to other commands where indicated.
SB—Set Baud Rate
SB lets you set and change the baud rate for the serial communications.
Note: Since this is changed with serial communication, once sent, the
baud rate of the application sending commands must be changed to
match baud rates or communications will fail.
The baud rate can also be changed from the APS™ spectrometer front
panel menu, see Table 4-1.
SBx
where:
x = 0 for 9,600
1 for 19,200
2 for 38,400
Examples:
To se the baud rate to 38,400:
SB2
Note: “OK” is sent in response to this command, but it is sent at the new
baud rate and is not readable at the previous baud rate. You must
now change your application baud rate to 38,400 in order to
communicate with the APS™ spectrometer.
SCA—Set Calibration for Aerodynamic Diameters
SCA lets you enter calibration data for time of flight data (aerodynamic
calibration).
SCAc,sc,tc
where:
c = channel boundary number (0 to number of channels +1).
sc = particle size in nm.
tc = time of flight for the boundary of the particle size channel.
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