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Searching the HPIB-bus for connected instruments.

Question asked by aufenanger on Jan 18, 1999

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Dear Albert,

I don't think there is another method. But you can set your timeout
programmatically to 0.5 seconds that gives all online devices enough time to
answer and all the thing is not to time consuming.

Best regards
B. Aufenanger
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Somatec B. Aufenanger & M. Bernhardt
Jagdweg 7a
D-82041 Deisenhofen

Telefon          : (089) 613 984 91
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Email             : Aufenanger@somatec.de
homepage     : http://www.somatec.com
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     -----Original Message-----
     From:     Kok A. [mailto:A.Kok@gasunie.nl]
     Sent:     Tuesday, January 19, 1999 7:13 AM
     To:     'hpvxd_xc@hpislsup.lvld.hp.com'
     Subject:     Searching the HPIB-bus for connected instruments.
     Importance:     High

     Hello all,

     I want to scan de HPIB-bus for connected instruments. At this moment

     i use the bus time-out to see if there is an instrument connected at
     that adres.
     This procedure takes a long time to complete.( when you check al
     possible adresses)
     Does anyone know a better and faster idea?
     We can't use VEE.IO to see which instuments are connected.

     :-)
     Albert Kok
     Consultant (HP-VEE)
     CMG Noord-Nederland B.V
     Email: Albert.Kok@CMG.nl
     Email client: A.Kok@Gasunie.nl

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VRFuser Jan 18, 1999 4:12 PM

Hello all,

I want to scan de HPIB-bus for connected instruments. At this moment
i use the bus time-out to see if there is an instrument connected at
that adres.
This procedure takes a long time to complete.( when you check al
possible adresses)
Does anyone know a better and faster idea?
We can't use VEE.IO to see which instuments are connected.

:-)
Albert Kok
Consultant (HP-VEE)
CMG Noord-Nederland B.V
Email: Albert.Kok@CMG.nl
Email client: A.Kok@Gasunie.nl

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michael.asbery Jan 18, 1999 4:17 PM

Hi,

Polling using the bus timeout feature is the best way to do it.
attached is a file with two functions: active_hpib_instruments
and active_instuments. The output of each function is an array of active
instruments.
for active_hpib_instruments it outputs an integer array of numerical addresses.
The active_instruments function takes a text array as an input containing
the names of devices
that have been configured and returns an array of active devices that
responded to my query -
sending a "*RST" to each instrument. The basic premise is that no timeout
occurs when sending the command to
an active instrument. In practice the active_instrument is the best way to
go, tailoring the function to an appropriate
command recognized by a properly configured instrument. The first function
works but fails
miserably if you are using GPIB bus extenders since these devices listen at
each address a timeout never occurs
thus you must send each instrument you are expecting a command and test for
an appropriate response.

Best of luck

Mike Asbery

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2 Replies

VRFuser Jan 18, 1999 4:12 PM
Mark Correct
Correct Answer
Hello all,

I want to scan de HPIB-bus for connected instruments. At this moment
i use the bus time-out to see if there is an instrument connected at
that adres.
This procedure takes a long time to complete.( when you check al
possible adresses)
Does anyone know a better and faster idea?
We can't use VEE.IO to see which instuments are connected.

:-)
Albert Kok
Consultant (HP-VEE)
CMG Noord-Nederland B.V
Email: Albert.Kok@CMG.nl
Email client: A.Kok@Gasunie.nl
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michael.asbery Jan 18, 1999 4:17 PM
Mark Correct
Correct Answer

Hi,

Polling using the bus timeout feature is the best way to do it.
attached is a file with two functions: active_hpib_instruments
and active_instuments. The output of each function is an array of active
instruments.
for active_hpib_instruments it outputs an integer array of numerical addresses.
The active_instruments function takes a text array as an input containing
the names of devices
that have been configured and returns an array of active devices that
responded to my query -
sending a "*RST" to each instrument. The basic premise is that no timeout
occurs when sending the command to
an active instrument. In practice the active_instrument is the best way to
go, tailoring the function to an appropriate
command recognized by a properly configured instrument. The first function
works but fails
miserably if you are using GPIB bus extenders since these devices listen at
each address a timeout never occurs
thus you must send each instrument you are expecting a command and test for
an appropriate response.

Best of luck

Mike Asbery
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Searching the HPIB-bus for connected instruments.

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