Path: utzoo!attcan!uunet!husc6!uwvax!oddjob!ncar!ames!ucsd!ucsdhub!hp-sdd!hplabs!hpl-opus!hpccc!hp-sde!hpfcdc!hpislx!rjs
From: rjs@hpislx.HP.COM (Bob Schneider from SSO)
Newsgroups: comp.sys.hp
Subject: Re: HP-IB question on HP9000s500
Message-ID: <5820004@hpislx.HP.COM>
Date: 3 Aug 88 22:38:46 GMT
References: <595@rocksanne.UUCP>
Organization: HP Measurement Systems Operation - Loveland, CO
Lines: 26

In article <595@rocksanne.UUCP> pat@rocksanne.UUCP (Peter A Torpey) writes:

>I'm trying to use the HP-IB bus on my Series 500 computer to interface to a
>PC.  Although I'm able to sense EOI when reading from my end (using the
>io_eol_ctl routine) in order to terminate a transmission, I  haven't
>found a way to write with an EOI at the end of my transmissions.  It seems
>that there should be a corresponding routine for writting (io_eol_ctl is only
>appropirate for reading).  The routine ioctl looks like it would do the trick,
>but this is only supported on the s800.  Is there any way I can
>send an EOI to terminate my transmissin and let the PC know the
>transmission is done?

	There is a routine called "hpib_eoi_ctl(3I)". It is essentially a
	toggle switch for your file descriptor. When turned on, all 
	subsequent writes to that file descriptor (assuming it's a fd to
	a valid HP-IB device file) will assert the EOI line with the last
	byte written. It looks like:

SYNOPSIS
	int hpib_eoi_ctl(fd,flag);
	ind fd,flag;

	If flag is non zero, EOI mode is enabled. If flag is zero EOI mode
	is disabled.

Bob Schneider     rjs%hpisla@hplabs.HP.COM   or   hplabs!hpisla!rjs