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RQS Service Request Mask
Each bit in the status byte is defined as follows:
1 Indicates that the units key was pressed. SRQ 102 appears on the spectrum analyzer
screen. If you activate the units key bit, it will remain active until you activate “EE” and
press a units key. (See “EE.“)
2 Indicates end of sweep. SRQ 104 appears on the spectrum analyzer screen. If you send any
RQS value that contains mask value 4, another sweep will be taken.
3 Indicates broken hardware. SRQ 110 appears on the spectrum analyzer screen.
4 Indicates completion of a command. It is triggered by EOI at the end of a command string
or the completion of a print or plot.
5 Indicates an illegal spectrum analyzer command was used. SRQ 140 appears on the
spectrum analyzer screen.
0 (LSB), 6, and 7 are not used.
The spectrum analyzer screen numbers 102, 104, and 110 are the octal values corresponding
to the status register values; that is, SRQ 102 = bit 6 = octal 100 and bit 2 = octal 2 are both
true.
A service request is generated only if the proper request mask bit has been set, and either
the condition itself or the Force Service Request (see “SRQ”) is sent. To set the request mask,
choose the desired interrupt conditions and sum their assigned values. Executing the RQS
command with this value sets the bit mask. After setting the bit mask, only the chosen
conditions can produce an interrupt. Generally, you must set the bit mask using the RQS
command. However, the “hardware broken” and “illegal remote command” conditions are
automatically enabled after presetting or sending the IP command. Pressing
(PRESET)
or sending
the IP command, then, produces the same interrupt bit mask as sending “RQS 40;” (decimal 40
is the sum of the assigned values of these two interrupt bits, 32 = Bit 5 and 8 = Bit 3).
For most conditions, the RQS mask bit stays set until the next IP or RQS command is executed.
The only condition in which this does not apply is the Units Key Pressed bit. When this bit (bit
1) is set in the RQS mask, a Units Key Pressed interrupt occurs if EE (enable entry mode) is
executed and a front-panel units key such as Hz,
kHz,
MHz, or
GHz
is pressed.
When a units key is pressed, the interrupt occurs and the Units Key Pressed bit in the RQS
mask is reset. To reenable the Units Key Pressed interrupt, you must send a new RQS mask.
Query Response
5-474
Programming Commands