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

Subject: Re: gpib device
From: Kazuro FURUKAWA <kazuro.furukawa@kek.jp>
Date: Wed, 12 May 1999 21:19:10 +0900
Hi, 

>>> On Mon, 10 May 1999 07:46:10 -1000,  Maren Purves <m.purves@jach.hawaii.edu>  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" <noboru.yamamoto@kek.jp>  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 <kazuro.furukawa@kek.jp>
 High Energy Accelerator Research Organization (KEK), Japan


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