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Operation
Command Reference
48 Operating Manual for RS-232 for XT/HPD Series Power Supply
Command Description
VMAX <voltage> Sets an upper soft limit on the supply’s programmed output voltage. If the
soft limit is exceeded, or if the soft limit value is lower than the present
output voltage setting, the supply will ignore the command, turn on the
ERR LED, and set the ERR bit in the accumulated status register.
Range: 0 to model maximum output voltage (VMAX)
Initial value: model VMAX
VMAX? Returns the supply’s soft voltage limit setting.
Response: VMAX <voltage>
VOUT? Measures and returns the supply’s actual voltage output using the built-in
voltage readback circuitry.
Response: VOUT <voltage>
VRDAT <Vlo>,<Vhi> Calculates and records the slope and offset for readback voltage using
VRLO and VRHI data. Set CMODE ON before using this command. See
also the calibration procedures in Section 4 .
<Vlo> and <Vhi> are in <voltage> format.
VRHI The power supply outputs a voltage value to an external voltmeter
connected as part of the calibration procedure and records a voltage
readback value internally. These values are at the high end of the
programmed voltage range. Refer to the output value as VRHI and record it
to use as input with the VRDAT command. Set CMODE ON before using
this command. See also the calibration procedures in Section 4.
VRLO The power supply outputs a voltage value to an external voltmeter
connected as part of the calibration procedure and records a voltage
readback value internally. These values are at the low end of the
programmed voltage range. Refer to the output value as VRLO and record it
to use as input with the VRDAT command. Set CMODE ON before using
this command. See also the calibration procedures in Section 4.
VSET <voltage>
or
VSET <-voltage>
Sets the power supply’s output voltage in volts (default) or in millivolts. This
programmed voltage is the actual output in CV (constant voltage) mode or
the voltage limit in CC (constant current) mode.
If you enter a negative voltage value, the power supply will assert a signal
on the J7-4 user signal line. You can use the user signal to trip external
relays to switch the output polarity.
Range: 0 to model maximum output voltage (VMAX)
Initial value: 0 volts
VSET? Returns the power supply’s present output voltage setting. Does not apply
to voltage settings which are being held. See HOLD command.
Response: VSET <voltage>