Tektronix PWS4205, Programmer'S Manual

Page: 66 / 90

Status and Events
Table 3-1: SBR bit functions (cont.)
Bit Function
6 MSS
Master Status Summary.
Obtained from *STB?
query. Summarizes the OSB, ESB, MAV, QSB, and EQS
bits in the SBR.
5
ESB
Event Status Bit.
Shows that status is enabled and
present in the SESR.
4 MAV
Message Available.
Shows that output is available
in the Output Queue.
3 QSB
Questionable Status Bit.
Indicates that a
questionable event has occurred.
2 EQS Shows that information is available in the Error/Event
Queue.
1
———— Not used.
0
———— Not used.
The Standard Event Status Register (SESR).
The SESR records six types of events
that can occur within the power supply as shown in the following fi gure. (See
Figure 3-3.)
Figure 3-3: The Standard Event Status Register (SESR)
Table 3-2: SESR bit functions
Bit Function
7 (MSB) PON
Power On.
Shows that the power supply was powered
on.
6
————
User Request.
This bit is not used.
5 CME
Command Error.
Shows that an error occurred while
the power supply was parsing a command or query.
4 EXE
Execution Error.
Shows that an error occurred while
the power supply was executing a command or query.
3 DDE
Device Error.
Shows that a device dependent error
occurred.
2
QYE
Query Error.
Either an attempt was made to read the
Output Queue when no data was present or pending, or that
data in the Output Queue was lost.
1
————
Request Control.
This bit is not used.
0 (LSB) OPC
Operation Complete.
Shows that the operation
is complete. This bit is set when all pending operations
complete following an *OPC command.
3-4 PWS4205, PWS4305, PWS4323, PWS4602, and PWS4721 Power Supply Programmer Manual