Re: Converting serial I/O to ethernet I/O
- From: Bob Gezelter <gezelter@xxxxxxxxx>
- Date: Fri, 16 Nov 2007 06:28:03 -0800 (PST)
On Nov 16, 9:06 am, tadamsmar <tadams...@xxxxxxxxx> wrote:
On Nov 16, 8:28 am, Bob Gezelter <gezel...@xxxxxxxxx> wrote:
On Nov 16, 8:04 am, tadamsmar <tadams...@xxxxxxxxx> wrote:
I maintain a VMS real-time app. that has a serial interfaces to
analyzers. The latest version of the analyzers support network
communications and we want to convert from serial to network.
Any pointers on how to do it? I think it's a matter of making the
right QIO calls, perhaps
just revising or adding alternative QIO calls.
tadamsmar,
It may be as simple as that, or a more extensive re-write. It depends
on the actual interface specifications of the analyzers.
In my career, I have seen both. I have seen devices just change from
serial interfaces to say, a LAT or telnet scheme; and I have seen
devices adopt completely different message formats, standards, and
protocols.
In the abstract, it is not possible to answer this question from the
information in your post. It would require careful reading of the
documentation for both the old analyzers and the new analyzers, and a
review of the source code of the application.
- Bob Gezelter,http://www.rlgsc.com
The manual says it uses the the same commands over RS-232 and
Ethernet. Over Ethernet, it uses TCP/IP and port 9880.
tadamsmar,
Then, as Bob Koehler has pointed out, one needs the programming models
for the particular IP stack that is being used.
In a very high level way, the sequence of processing will be
different, but the mechanisms will be dramatically different. The
routines to manage a TCP connection are subroutines with their own
inherent semantics. There is also a QIO interface to TCP, but a
reliable product is not a simple substitution of one set of QIOs for
another.
- Bob Gezelter, http://www.rlgsc.com
.
- References:
- Converting serial I/O to ethernet I/O
- From: tadamsmar
- Re: Converting serial I/O to ethernet I/O
- From: Bob Gezelter
- Re: Converting serial I/O to ethernet I/O
- From: tadamsmar
- Converting serial I/O to ethernet I/O
- Prev by Date: Re: Converting serial I/O to ethernet I/O
- Next by Date: Re: Getting Fortran to read CTRL/Z in a file as data
- Previous by thread: Re: Converting serial I/O to ethernet I/O
- Next by thread: Re: Converting serial I/O to ethernet I/O
- Index(es):
Relevant Pages
|
