Experimental Physics and Industrial Control System
Subject: |
Re: gpib device |
From: |
Kazuro FURUKAWA <[email protected]> |
Date: |
Wed, 12 May 1999 21:19:10 +0900 |
Hi,
>>> On Mon, 10 May 1999 07:46:10 -1000, Maren Purves <[email protected]> wrote;
> question, as I'm looking into GPIB-Ethernet or GPIB-RS232 'converters'
> at the moment: does the HP-2050A support secondary addressing?
> We need to be able to connect remotely as well as have secondary
> addressing.
ET-488 from Tektronix, which Noboru mentioned, can handle secondary
addresses. I may evaluate HP-2050A as well soon.
>>> On 11 May 1999 10:56:03 JST, "Noboru Yamamoto" <[email protected]> wrote;
> We use a similar Ethernet-GPIB bridge made by Sony-Tektronics
> called ET-488( which may not available outside JAPAN).
As I saw an advertisement thru Tektronix at CERN sometime ago, I
think it's available in the U.S as well, although it was developed
by Sony-Tektronix in Japan.
> It works fine in EPICS environment unless your device does not
> use SRQ.
> ET-488 sends SRQ signal using SIGURG signal which is NOT defined
> in VxWorks.
ET-488 sends SRQ via out-of-band data on a TCP channel. vxWorks
should be able to receive it via some mechanisms. Actually I
proposed to use out-of-band TCP data for SRQ when they were
designing ET-488 in 1991. Unfortunately it cannot use UDP to
transfer GPIB data, and using TCP only one client can connect to
ET-488 at a time, even though several GPIB devices are connected
with it.
> I'm just curious how HP-2050A can handle SRQ.
Regards, Kazuro.
-----
Kazuro FURUKAWA <[email protected]>
High Energy Accelerator Research Organization (KEK), Japan
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