Re: GPIB device development

Hello Dave

Ah okay....so how is the expected communication flow actually?

From my understanding it looks like the controller ends his part after the
MTA5 command, which tells device 5 to respond...

So can the device just begin transferring data with last byte EOI set or
does the device also needs
to send those MTA/MLA as well prepending the payload?


thanks in advance
richard


Am Fr., 19. Juni 2020 um 09:48 Uhr schrieb dave penkler <[email protected]
>:

> Hi Richard,
> ibterm by default tries to read a response after a send but will not
> report an error on timeout of the read.
> cheers,
> -Dave
>
> On Thu, 18 Jun 2020, 10:52 Richard Klingler, <[email protected]>
> wrote:
>
>> Good morning (o;
>>
>> As I decided to develop a GPIB device based on STM32F MCU I did a first
>> setup based on a Nucleo-F207ZG board with attached 75160/161 transceivers...
>>
>> In my test code I just check for DAV and set NRFD and NDAC accordingly....
>>
>> Interestingly...when I send for example a *IDN? query to my test device,
>> which doesn't send back any data (not yet ;o), I don't get any errors in
>> ibterm....so is this normal that ibterm doesn't wait for data and just
>> closes the communication?
>>
>> Currently I just send out the received commands/Data out the USB CDC
>> device...
>>
>> Sending *IDN? I get in my USB console:
>>
>> CMD: 40
>> CMD: 3F
>> CMD: 25
>> DAT: *
>> DAT: I
>> DAT: D
>> DAT: N
>> DAT: ?
>> CMD: 3F
>> CMD: 20
>> CMD: 45
>>
>> Or does it misread EOI and therefore closes the communication?
>>
>>
>> thanks in advance
>> richard
>>
>>
>>
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>

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