M9B-HFS INTERFACE
M9B-HFS OPERATION
Release 1.0 (97/10)
3-9
ISET?
Asks for the supply’s present output current setting. Does not apply to current settings
which are being held. See HOLD command.
Response:
ISET <current>
LLO
Disables the front panel LOCAL switch. When LLO is in effect you can only return to
local mode using the GTL command.
MASK
<mnemonics>
Parameters:
CV, CC, OV, SD, FOLD, ERR, OT, ACF, OPF,SNSP, ALL, NONE
Disables the supply's previously unmasked operating conditions from setting bits in the
fault and status registers. See Section 3.4. Mnemonics are separated from each other by
commas and may be sent in any order.
Initial value:
MASK ALL
Note:
UNMASK NONE = MASK ALL; MASK NONE = UNMASK ALL
OUT <state>
Parameters:
<1/ON, 0/OFF>
Enables or disables the supply’s voltage/current output. The supply will continue to
accept new commands while the output is disabled but these will not be implemented until
OUT ON or OUT 1 is received. OUT OFF (or OUT 0) also asserts the isolation signal on
the rear panel J7 connector, line 3. You can use the J7-3 user signal to trip external relays
to isolate the power supply from the load.
Initial value:
OUT 1 (output enabled)
OUT?
Asks for the present enabled/disabled status of the supply’s output voltage/current.
Response:
OUT 1 output enabled
OUT 0 output disabled
OVCAL
Causes the master controller to perform automatic calibration of the supply’s over voltage
protection circuitry. Set CMODE ON before using this command. Ensure jumper J66 and
jumper J104 on the M9B-HFS Interface PCB are connected for remote operation.
OVSET <volts>
Sets the supply’s over voltage protection trip point in volts (default) or in millivolts. If the
trip point is exceeded, or if the trip point value is lower than the present output voltage
setting, the supply will ignore the command and set the ERR bit in the accumulated status
register.
Range:
0 to 110% of model maximum output voltage (VMAX)
Initial value:
110% of model VMAX
OVSET?
Asks for the supply’s present over voltage protection limit.
Response:
OVSET <voltage>
