AMETEK HPD Series - Manual (Page 50)

Operation
Accumulated Status, Status, and Fault Registers
48 Operating Manual for GPIB for XT/HPD Series Power Supply
Accumulated Status, Status, and Fault Registers
The GPIB option card uses three separate registers which are always active. They
are the accumulated status, status, and fault registers. You can use the status
commands shown in Table 3.8, “Status Commands” to activate the registers. The
bit register has eight conditions, each assigned a bit weight. When querying a
register, the controller returns a response which is the sum of the weights of all
relevant conditions.
Example:
The accumulated status register shows that PON, REM, CC and CV have all been
active since the last accumulated register query.
Table 3.10 shows the mnemonics and bit weights which correspond to each register
condition. You can control conditions in the fault and status register by using the
MASK and UNMASK commands.
Table 3.10 Accumulated Status, Status, and Fault Registers
Notes:
1. Only CV, CC, OV, SD, ERR, PON and FOLD can be masked or unmasked.
2. The error (ERR) bit is reset in the accumulated status, status, and serial poll registers with an
error query (ERR?).
3. The accumulated status register is cleared with an accumulated status query (ASTS?).
4. A fault is cleared with a fault query (FAULT?).
ASTS? Query the Accumulated Status register.
ASTS 771 Controller response.
771 = 512 + 256 + 2 + 1 = PON + REM + CC + CV
Condition Mnemonic Bit Position Bit Weight
Constant voltage operation CV 0 1
Constant current operation CC 1 2
Not used – 2 4
Overvoltage protection tripped OV 3 8
Not used – 4 16
Supply external shutdown active (J7-1) SD 5 32
Foldback mode operation FOLD 6 64
Remote programming error ERR 7 128
Power ON (accumulated status, status
registers only) PON 8 256
Remote mode (accumulated status, status
registers only) REM 9 512