KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 1.232 (Unit Rev 0 or 1) - Manual (Page 51)

SERIES EL 063010
3-17
Request register. If bit 6 is a 1 (true), it causes the load to assert the SRQ line to the host con-
troller.
Figure 3-5 also shows that if the error/event queue is not empty, bit 4 indicates that a message
is available in the output buffer.
3.10.7.2 OPERATIONAL STATUS REGISTER
The OPERational condition register contains conditions which are a part of the instrument’s nor-
mal operation. The PTR and NTR registers serve as masks between the Condition register and
the Event register. Setting a bit in the PTR register allows positive-going transitions (0 to 1) in
the Condition register to set the corresponding Event bit, while setting a bit in the NTR register
enables negative going transitions (1 to 0). Corresponding bits can be set in both registers to
enable latching of either transition type.The definition of each of these bits (condition register) is
as follows:
• 0 - CAL — Calibration in progress
• 5 - WTG — Waiting for Trigger
• 6 - 7 - Not Used — always zero.
3.10.7.3 STANDARD EVENT STATUS REGISTER
The Standard Event registers contains bits (condition register) is as follows:
• 0 - OPC — Operation Complete
• 1 - Not Used — always zero.
• 2 - QYE — Query Error
• 3 - DDE — Device Dependent Error
• 4 - EXE — Execution Error
• 5 - CME — Command Error
• 6 - Not Used — always zero.
• 7 - PON — Power On since this bit last read
3.10.7.4 QUESTIONABLE STATUS REGISTER
The QUEStionable condition register (see Figure 3-5) contains status bits representing unusual
operation such as inconsistent sensor readings or unusual but non-fault conditions.
• 0 - Voltage Fault (VF) — 1 indicates the Voltage Fault
• 1 - Overcurrent (OC) — 1 indicates overcurrent condition has been detected.
• 2 - Not Used — always zero.
• 3 - Overpower (OP) — 1 indicates power has exceeded the rated maximum.
• 4 - Overtemperature (OT) — 1 indicates overtemperature condition has been detected.
• 5 - 7 - Not Used — always zero.
• 8 - Extended Power Unavailable (EPU) — 1 indicates Extended Power Unavailable
• 9 - Not Used — always zero.