Monitoring GPIB commands on GPIB bus automated without NiSpy

Does anybody know how NiSpy intercepts commands to the GPIB bus (first guess is a filter driver)? I need to monitor (automated) equipment activity on our ATE stations.

Basically the National Instrument drivers notify a NI-Spy DLL each time
a driver call is made. If NI-Spy is running, this information is
passed into the NI-Spy executable.
NI-Spy can monitor any supported National Instruments driver in this
manner, but it will not be able to monitor activity on the bus
itself. To monitor actual bus activity you would need something
like a PCI-GPIB+ analyzer card, and utilize the GPIB analyzer which is
included in the NI-488.2 driver.
Jason S.
Applications Engineer
National Instruments

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Need my computer to look like another instrument on the GPIB bus

I have a set of test instruments connected via a GPIB bus and controlled by a desktop computer with a 488 card in it. Into this scenario I now need to connect, to the 488 bus, another computer, a laptop. The laptop will NOT be a controller of any sort. The laptop must appear as another addressable instrument to the desktop controller. The laptop has only a USB interface through which I can talk on the 488 bus so. What type of USB to GPIB hardware do I need to do all of this?

Hello,
Yes, Jim's suggestion is right on, where once you have a GPIB interface for your laptop (via a USB-GPIB device) you will be able to pass controller in charge status to whichever interface you choose, and the other interfaces and instruments will appear as devices on the bus.
Repost if you have any other questions!
Best Regards,
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Can two gpib hosts communicate on one GPIB bus

I have an application where there is an PCI-GPIB card that controls several programmable power supply units.
Could I add a second GPIB interface (say...USB) and plug into the existing GPIB bus and have the PCI(machineA) and USB(machineB) GPIB hosts talk to one another? Only one GPIB interface would need to talk to/control the Power Supplies. Is this a supported configuration?

This is supported. The second GPIB interface must be configured to be not the System Controller. You can do this programatically when bringing the board online like this:
int BoardHandle = ibfind("gpib0");
ibrsc(BoardHandle, 0);
You'll also want to be sure to set the second board at a different PAD than the first board.
Craig A.
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I am bringing up a LV app that runs an HP scanner on
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By the way, I'm using an hp3852a driver I downloaded
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Note: I am reposting this to the gpib discussion
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How can I monitor Status word From the other side of the GPIB bus

I develop Thermal system control that should be operate thru the GPIB IEE 488.2 bus , my instrument application already written in Visual Basic ,The system knowes to do basic operation such as SETPOINT ,AIRDUT , BEGIN , STOP and more but I have do a problem , any time that I capture command from the controller the status word stuck at listener mode and I can not send another command again because my loop is waiting for the other side (the controller ) to tallk by monitor the IBSTA word .
There is anyway to reset ,clear ,initialize STATUS word again to his default value ?
Note : I am using VB 6 , the Samples that you have here for Non-controller is good so far if I want to send and recive data manualy (c
omputer to computer)
What if I have A system that work and always waiting for capture command and do somthing ?
I will be very greatful if anyone can help me , send me sample code for Status checking loop.
MIKI-AVI

Hello Miki-Avi,
I'm having a little bit of trouble understanding what you're trying to do. It seems that you have an instrument application that you have written and works in some instances but gets into an infinite loop in other cases. I think that your loop is waiting for something in the Status byte to change, and you're wondering how you can get it to change.
I'm not sure what bit you're waiting for, but I would assume that it is the LACS bit 2. You do not want to simply reset the IBSTA byte because this byte tells you what is happening on the GPIB interface. So, if you're waiting for the LACS bit to change, then you are waiting for the board to be addressed as a listener. Your controller would address the non-controller as a listener once you sent it da
ta with an IBDEV and an IBWRT call.
If you are looking for code for a status checking loop, check the following resources. Remember that you must call ibwait 0 to update your IBSTA byte. The 488.2 Function Reference is very useful in figuring out what you need to do.
http://venus.ni.com/stage/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3EF8D56A4E034080020E74861&p_node=DZ52353&p_submitted=N&p_rank=&p_answer=&p_source=Internal
http://ae.natinst.com/operations/ae/public.nsf/fca7838c4500dc10862567a100753500/9cc0939663f1c5de862565d70082e89e?OpenDocument
Please let me know if you need more assistance.
Scott B.
National Instruments
Applications Engineer

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I'm programming in Visual Basic 6 to communicate between a computer and HP Measurement Devices (BER-Meter) with GPIB. I have already read information and code for this. My platform is W98. The NI488.2 commands can be sent without any problem between the equipements. However when I'm using the GPIBNotify ActiveX Control to use the callback function, there is a permanent starting and stop of the GpibNotify Sub. The SetupMask and RearmMask are set to RQS and the HP Device is well configured. Moreover an oscilloscope measuring the 10th line (SRQ
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Hello-
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Randy Solomonson
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National Instruments

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Hello-
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Tom Oconnell wrote:
Hate to ask what is probably a simple issue, but I can't find a keystroke command that will close all open apps without restart or shutdown... just close everything that is open and let me continue or shut the lid to sleep ...
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Monitoring GPIB commands on GPIB bus automated without NiSpy

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