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6.3.5
Execution Error ("Exx")
Power supply responds with an execution error if it receives a valid command, but it cannot
execute the command at that time, because another setting prevents it. The execution error
response format is 'Enn<CR>' where 'nn' is '01' to '08'. The following error commands are
available:
E01 Cannot program voltage above the OVP setting (*1)
E02 Cannot program voltage below the UVL setting (*2)
E04 Cannot set OVP below the programmed voltage (*3)
E06 Cannot set UVL above the programmed voltage (*4)
E07 Cannot set OUTPUT ON during fault shut down
E08 General Error (*5)
*1: E01 - Returned if 105% of the 'PV' value is greater than the 'OVP' setting.
*2: E02 - Returned if the 'PV' value is less than 105% of the 'UVL' setting.
*3: E04 - Returned if 'OVP' value is less than 105% of the 'PV' setting.
*4: E06 - Returned if 105% of the 'UVL' value is greater than the 'PV' setting.
*5: E08 - Returned if an attempt to set an operation mode (Internal Resistance, Constant Power,
Sequencer, Slew-Rate or Analog Programming) if another operation mode is enabled, or loading
an empty memory cell. Only one of the following operation modes can be active at a time: Constant
Power, Internal Resistance, Sequencer, Analog Programming or Slew-Rate.
6.3.6
Service Request (SRQ)
SRQ is defined as the only specific case in which the power supply can initiate a message out over
the serial bus. Any other message from the power supply to the controller (HOST PC) is sent as a
response to a query.
SRQ is used to alert the HOST PC that a certain change to the power supply has occurred. SRQ is
sent if the contents of the Status (SEVE) or Fault (FEVE) registers changes from all zeroes to any
bit(s) set. Additional events set additional bits in the fault or status event registers, but no additional
SRQs are sent until SEVE and/or FEVE is cleared by reading its contents.
SRQ message format is: 'nn nn<CR>'. This is 0x80 + power supply address repeated twice and a
carriage return.
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