HP E1340A User Manual page 209

The Service Request
Enable Register
Presetting the Enable
Register and Transition
209 HP E1340A AFG Status
Operation Status Summary Bit (OPER):
monitored by the Operation Status Group is present, when the appropriate
bit is latched into the group's Event Register, and when the bit is unmasked
by the group's Enable Register.
Reading the Status Byte Register
The Status Byte Register can be read with either of the following
commands:
*STB?
SPOLL
Both commands return the decimal weighted sum of all set bits in the
register. The difference between the commands is that
bit 6 ( service request). The serial poll (
RQS
is cleared when data is read from the output queue.
MAV
The Service Request Enable Register specifies which (status group)
summary bit(s) will send a service request message to the computer over
HP-IB. The bits are specified (unmasked) with the command:
*SRE <unmask>
All unmasked bits in the Enable Register can be determined with the
command:
*SRE?
The Service Request Enable Register is cleared at power-on, or by
specifying an <
The Enable Registers and Transition Filters in the Questionable Signal and
Operation Status Groups can be preset (initialized) with the command:
Filter
STATus:PRESet
All bits in the Enable Registers are masked (i.e.
in the Condition Registers set corresponding bits in the Event Registers on
positive (0 to 1) transitions.
unmask > value of 0.
Bit 7 is set (1) when a condition
*STB? does not clear
) does clear bit 6.
SPOLL
unmask is 0), and all bits
< >
Chapter 8