Re: Out of order replies from a serial device

[Phillip Sorensen <pas37@cornell.edu>]

Emmanuel Mayssat wrote:
> Before you send a command to your serial device, you should clear the
> serial buffers.
>
> So a read operation becomes:
>
> 1/ Read ( you will read nothing most of the time), this operation
> clears /flushs the serial buffers.
> 2/ send your serial commnad/inquiry
> 3/ read the serial port a second time to get your PV value
>
> Note that this is also assuming that you are using serial port locking,
> and that this feature is working correctly (i.e. only 1 write-read
> request at a time )

That sounds like it would work, but I am currently using the asyn 
devGpib device support module framework with GPIBREAD commands.  The 
framework handles the actual communications.

I can rewrite the device support to use GPIBCVTIO commands and write the 
communication code myself, but I would prefer to use the devGpib code 
for as much as possible.

Phil Sorensen
CHESS