Giga-tronics 58542, Operation & Maintenance Manual

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58542 VXIbus Universal Power Meter
2-42 Publication 21555, Rev. E, September 2002
The event status register is 8 bits long and is structured as follows:
Bits 1 and 6 are not used. When bit 3 is a 1, a device-dependent error has occurred. When bit 4 is a 1, an
execution error has occurred. When bit 5 is a 1, a command error has occurred. Bit 7 is a 1 when the
58542 is turned ON. The 58542 does not have a standby mode; therefore, it is probably not useful to
enable bit 7 of the event status register mask (by sending the command *ESE 128).
In the default state, the meter’s event status register is masked, or set to off. None of the bits are enabled.
If an execution error occurs, a service request will not be sent to the controller and the event status
register will remain set to 0. The *ESE command is used to enable individual bits. These bits must be
enabled individually. They can be cleared or turned off as a group by sending the *CLS command.
To use the event status register, bit 5 of the status byte must also be enabled by sending the command
*SRE 32.
The *ESR? query returns the current value of the event status register.
2.5.23.2 Status Byte Register
Notes:
1. The condition indicated in bits 1 through 5 must be enabled by the Service Request Mask to cause a Service Request
Condition. The mask is set with the *SRE command followed by ASCII characters. The value of the byte is determined by
summing the weight of each bit to be checked.
2. The RQS (bit 6) is true when any of the conditions of bits 4, 5 and 7 are enabled and occur.
3. Bits remain set until the Status Byte is cleared.
NOTE:
The logical value in the register is used both to enable a bit’s event function
and to enable that bit of the event status register mask to report the event status
(Following the *ESR? command).
7 6 5 4 3 2 1 0
Operational Status
Require Service
(RQS)
Event Status
Message
Available
0 0 0 0
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