Publication 5390-001 Revision B
17
Harvard Apparatus Model 33 Twin Syringe Pump User's Manual
Pump Chain Commands
A prompt is a string of ASCII characters sent by a pump, indicating the pump’s address
and its present state:
<lf>, 1 or 2 digit address, prompt character
Prompt Characters Meaning
: Pump stopped
> Syringe 1 infusing
< Syringe 1 refilling
* Pump stalled
Pump Commands and Responses
RUN
Starts pumping according to the present setting of the pump. If pump already pump-
ing, a “Not Applicable” error is returned.
STP
Stops pump if it was running. If pump already stopped,a “Not Applicable”error is returned.
RAT [{A|B}] [[<float> [<units>]]
Request to set or query infusion rate settings.
Set syringe 1 rate:
RAT rate
RAT rate units
RAT A rate
RAT A rate units
Set syringe 2 rate (only valid in proportional mode):
RAT B rate
RAT B rate units
Rate is of the format: f f f f f f
Units are one of Meaning
UM µl/mn
UH µl/hr
MM ml/mn
MH ml/hr
Rate 2 is only accepted when mode is Proportional. If rate is accepted and valid, rate
will become the new rate. If the rate is invalid, an “Out Of Range” error is returned.
Query syringe 1 rate:
RAT
RAT A
Query syringe 2 rate (only valid in proportional mode):
RAT B
Response is of the following format:
f f f f f f <units>
Where units are one of the following:
ml/mn, ml/hr, µl/mn, µl/hr
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