M9B-HFS OPERATION
M9B-HFS INTERFACE
3-6
Release 1.0 (97/10)
CMODE?
Asks for the power supply’s calibration mode status.
Response:
CMODE
0 (disabled)
CMODE 1 (enabled)
DLY < time>
Parameter:
seconds
Sets a programmable time delay employed by the power supply before reporting fault
conditions. The power supply uses the time delay after receiving a new output voltage or
current setting via VSET or ISET, or after receiving RST, TRG
,
or OUT ON commands.
During the time delay, the power supply disables
CV, CC, and FOLD conditions from
generating faults, preventing possible nuisance foldback if the supply momentarily
switches modes while changing an output setting.
Range:
0 to 32 seconds, with 32ms resolution
Initial value:
0.5 seconds
DLY?
Asks for the setting of the programmable time delay before the power supply reports fault
conditions.
Response:
DLY <seconds>
ERR?
Asks for the most recent remote programming error. When the power supply detects a
programming error, it lights the ERR LED and sets the ERR bit in the accumulated status
and fault registers. If the ERR bit has been masked using the MASK command, then the
ERR bit in the registers will not be set. Once an error is detected, the remaining portion of
the command line is discarded. An error query clears the ERR bit in the status register.
See
Section 3.5 Error Codes.
Response:
ERR <error number>
Example:
ERR 0 (if no error)
FAULT?
Asks for the state of the fault register. A bit is set in the fault register when a fault arises
for that condition. Table 3.4-1 lists the conditions which activate a fault bit. You can use
the MASK command to disable bits from being set in the fault register.
When a bit is set in the fault register it also asserts a signal on the J7-4 user signal line.
You can tie the J7-4 fault line signal to the power supply's own External Shutdown user
line, J7-1, so that the shutdown signal goes low (active) in the case of a user-defined fault.
The FAULT? query clears bits in the supply's fault register and fault line.
Response:
FAULT <fault mask>
where fault mask is the decimal equivalent of the total
bit weights for the operating conditions as listed in the fault register. See Section 3.6
Accumulated Status, Status, and Fault Registers
.
