Publication 5390-001 Revision B
19
Harvard Apparatus Model 33 Twin Syringe Pump User's Manual
Pump Chain Commands
Query pumping direction of syringe 1:
DIR
Response will be one of:
INFUSE
REFILL
PAR [{ON|OFF}]
Request to set or query Parallel or Reciprocal setting.
SET: Command
Meaning
PAR ON Sets syringes to parallel pumping direction.
PAR OFF Sets syringes to reciprocal pumping direction.
Direction of syringe 2 changes appropriately, while direction of syringe 1 does not change.
Query:
PAR
Possible Responses Meaning
ON Parallel
OFF Reciprocal
IN <d>
Request to read in the TTL logic level at the specified pin,“d”, on the external 9 pin
D-SUB connector.
Valid pin numbers for input are:
6, 7 and 8
Possible Responses Meaning
ON TTL level high
OFF TTL level low
If the pin specified is invalid, a “Not Applicable” error is returned.
OUT <d> = {ON|OFF}
Request to set the TTL logic level at the specified pin “d”on the external 9 pin D-SUB connector.
ON – Set pin to a logic high
OFF – Set pin to a logic low
Valid pin numbers for output are:
4 and 5
If the pin specified is invalid, a “Not Applicable” error is returned.
SAV
Request to save pump settings in the pumps non-volatile memory (NOVRAM).
Normally, settings changed from a pump chain are not stored in the pump’s NOVRAM
and are lost after power down.
VER
Request for version of pumps embedded software.
Response for the present version will be: 33V2.0
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