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<== Date ==> <== Thread ==>

Subject: STB and Serial Trigger for async devGpib vxi11 device support
From: "Niedermayer, Philipp" <p.niedermayer@fz-juelich.de>
To: "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Thu, 2 Mar 2017 13:51:17 +0000

Hello,

 

I am implementing an EPICS IOC to control a device connected via GPIB to an Keysight E5810 LAN/GPIB Gateway. Therefore I am using devGPIB of the asyn module and connect to the gateway over LAN via the VXI11 Protocol.

 

I am able to send simple commands to the device. However, for a measurement routine a more complex protocol is required by the device. This includes not only sending and receiving binary data but also reading out the status byte (VXI: “Word Serial Read STB”) and sending a trigger (VXI: “Word Serial Trigger”).

 

Therefore I have chosen a GPIBCVTIO command with a custom convert function that takes care of all I/O that the protocol requires. However I cannot figure out how to read the STB and trigger the device.

Below is a draft of the custom I/O function with the missing parts.

 

How can I get the STB and do Serial Triggering?

 

Thanks in advance for your help,

Philipp

 

 

/* file XXXSup/devXXX.c */

//...

 

static int measurement(struct gpibDpvt *pgpibDpvt, int P1, int P2, char **P3) {

 

     size_t count = 0;

 

     // initiate measurement by sending single byte "\x17"

     asynStatus status = pgpibDpvt->pasynOctet->write(

                     pgpibDpvt->asynOctetPvt, pgpibDpvt->pasynUser,

                     "\x17", 1, &count);

 

     // TODO: check that STB equals 0xA to continue (device will not raise SRQ)

    

     // TODO: start measurement by triggering the device (Serial Trigger)

    

     // TODO: check STB:

     //              0x8 --> measurement completed, data ready

     //              0x2 --> error occurred, abort

                    

     // TODO: initiate data sending by triggering the device again

    

     // read data (128 bytes)

     char buffer[128];

     asynStatus status = pgpibDpvt->pasynOctet->read(

                     pgpibDpvt->asynOctetPvt, pgpibDpvt->pasynUser,

                     buffer, 128, &count, 0);

                    

     // DONE

     return 0;

 

}

 

//...

 

static struct gpibCmd gpibCmds[] = {

     //...

{&DSET_SI, GPIBCVTIO, IB_Q_LOW, 0, 0, 0, 0, measurement, 0, 0, 0, 0, 0},

};

 

//...

 

 

 



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Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
Prof. Dr. Sebastian M. Schmidt
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Replies:
RE: STB and Serial Trigger for async devGpib vxi11 device support Mark Rivers
Re: STB and Serial Trigger for async devGpib vxi11 device support Eric Norum

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