User`s guide

Internal Commands
Internal commands are used by the pump but are not meant to be entered by the user. They are listed here
as additional information.
method
Defines the file header for an exported method.
method {hex data}
mend
Defines the end of an exported method transfer.
mend
mstep
Defines a step in an exported method.
mstep {hex data}
status
Displays the raw status for a controlling computer. The output is in three integer fields and one flag field,
all separated by spaces and terminated by a carriage return/linefeed pair.
The first integer is the rate in femtoliters per second. The second integer is the infuse time in seconds. The
third integer is the infused volume in femtoliters. All three values are for the current direction.
The flag field consists of five flags.
The first flag is the motor direction and will be “i” if the pump is infusing and “w” if the pump is
withdrawing.
The second flag is the limit switch status. If the infuse limit switch was hit, “I” is displayed. If the withdraw
limit switch was hit, “W” is displayed. If no limit switch was hit, “.” is displayed. (The PHD ULTRA
™
does not
use limit switches, so “.” will always be returned in this position”)
The third flag is the stall status and will be “S” if the pump has stalled. Otherwise it will be “.”.
The fourth flag is the trigger input state and will be “T” if high and “.” if low.
The fifth flag is the direction port state and will be “I” for infuse and “W” for withdraw.
Harvard Apparatus PHD ULTRA
™
Syringe Pump Series User's Manual
Publication 5419-002-Rev-A
88
U
sing The PHD ULTRA™