Firmware Commands B-7
SFS Set Flow Set Point
This command is used to set the inlet flow control set point which represents 0.6
L/min aerosol flow for the flow control system. When issued with a parameter, this
command uses that parameter as a control point with which to control pump. The
differential orifice pressure is compared to the control point and adjustments are
made to the pump drive to maintain a match between the two. The actual control
point is compensated by the current value of the Absolute Pressure sensor to
compensate for inlet pressure.
Command: SFS,xxxx Command to set flow control set point
x = 0 to 4095
Response: OK
Example: SFS,2312 Command to set current flow control values
OK Response
SFS Command to read back the current settings
2312 Response provides set point
SFZ Set Flow Zero
This command is used to set the flow control zero value. When issued with a
parameter, this command uses that parameter as the zero value for the flow system.
When issued without a parameter, the command echoes the current flow zero value.
The flow zero value is normally set using the SZ command, so this command is
seldom needed to actually set the flow zero point value.
Command: SFZ,xxx Command to set flow zero set point
xxx = 1 to 350
Response: OK
Example: SFZ,164 Command to set current flow zero value
OK Response indicates acceptance
SFZ Command to read current flow zero value
164 Response
SG Set Growth Heater
The set growth heater command switches the growth tube heater on or off. The heater
is always in the “on” condition when the instrument is first powered up.
Command: SG,x Command to set growth tube heater on or off
x = 0 turns heater off, x = 1 turns heater on
Response: OK
Example: SG,0
Command turns heater off
OK Response
SG Command to read back the current setting
0 Response indicates heater is off
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