Bit Name
Bit Name
Bit No
Bit No
Meaning
(*3)
(*3)
(*1)
(*2)
(*3)
Meaning
ovp
not used
‘1’ - Indicates that the over-voltage protection was tripped
‘1’ - Indicates that a failure occurred at the input voltage supply
‘1’ - Indicates an overflow in the communication buffer
‘1’ - Indicates that the foldback protection was activated
‘1’ - Indicates an attempt to program the power supply to a voltage
out of specification limits.
‘1’ - Indicates an attempt to program the power supply to a current
out of specification limits.
‘1’ - Indicates a programming error has occurred
‘1’ - Indicates that the over-temperature protection was tripped
‘1’ - Indicates that an unknown string was received
otp
wrong command
a/c fail
buffer overflow
fold
wrong voltage
prog
wrong current
Table 5-6: Alarm status register content.
Table 5-7: Error codes register content.
2. Alarm Status Register:
The alarm status register records fault conditions occurring during power supply operation. Any set bit
in this register causes the ‘alarm’ bit in the operational status register to be set. Reading the register
does not change it’s content. The register is cleared by :DCL; command.
3. Error Codes Register:
The error codes register records errors that occurred during the programming of the power supply. Any
set bit in this register causes the ‘prog’ bit in the alarm status register to be set. Reading the register
does not change it’s content. The register is cleared by :DCL; command.
Notes: (*1) Since at each AC turn off the AC fail bit is generated and stored, it is recommended to
send a :DCL; command following application of AC voltage to the power supply, to clear the
alarm status register.
(*2) FOLD bit is automatically reset upon cancellation of FOLD protection.
(*3) OVP,OTP and ‘prog’ bits reset at AC turn-off or by :DCL; command.
1
1
2
2
3
3
4
4
5
5
5.5.4.2 Status control commands
#
Commands
1 :STA?;
2 :ALM?;
Description
Reads the operational status register content.
Returns the string
followed by ASCII characters representing the
register’s content.
Refer to table 5-5 for the register content description.
example- OS00010000
OS
Reads the alarm status register content.
Returns the string AL followed by ASCII characters representing the
register’s content.
Refer to table 5-6 for the register content description.
example- AL00000
In case the OTP or OVP is triggered, the front panel control is disabled until the AC input is
recycled by turning the AC ON/OFF switch to OFF and after approx. 10 sec. to ON.
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