Status-byte of HP4194: How to read out?

Hi all,
I would like to know when my instrument (HP4194) has finished the
actual measurement sweep, so that Labview (v5.0.1) can use the whole
aquired data set etc. I found in the instruments handbook some notes
about the status-byte: By default, all bits of this byte are masked,
therefore first I have to send the RQSx command, where x is a number
between 0 and 255, indicating the non-masked bits. One of these bits
(bit 1) is described as "sweep complete", so it would be fine to now its
value. But how??? Further, I found that there has do be sent a serial
poll, but when I tried to send it (with the pre-defined GPIB-Serial-Poll
command), I always get errors. Has anyone experience in using the status
byte and knows the co
rrect commands to send to my instrument?
Thanks a lot,
Rafael

Hi,
The IEEE 488.2 standard specifies a status byte model that the bus controller can use to determine the state of the instrument.
The only mechanism instruments have to notify the controller of any condition is using Service Requests (asserting the SRQ line of the GPIB bus). There's only one SRQ line on the GPIB bus. When the line is asserted, the controller has to ask the status of each instrument to determine which one issued the service request. The process is calles serial polling. When the controller conducts a serial poll, it reads the status byte of the instrument. According to the IEEE 488.2 standard, if bit 6 (0x40) is set, the instrument is requesting service. Each bit in the Status byte represents an instrument condition. Bits 4, 5 and 6 are d
efined by the IEEE 488.2 standard. The rest are instrument specific.
The IEEE 488.2 status byte model defines a method to configure the conditions that makes an instrument generate a service request. The Service Request Enable (SRE) Register masks the Status byte. When a bit is set in the SRE, that condition will generate a service request.
For example, if you're instrument manual specifies that bit 2 of the Status byte is sweep complete condition, then you can send the instrument *SRE 0x01 to unmask bit 2.
The following tutorial has detailed information:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/cf4fcc64d7ae6918062569df00630630?OpenDocument#4
This is not specific to NI or you're instrument. It is part of the IEEE 488.2 standard. You can probably find more info on the web.
DiegoF

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