On Thu, 20 Dec 2001 17:51:00 -0700, "WEBB,TIM (A-Sonoma,ex1)" wrote:

>You want to use the PIC for Digital I/O and have it controlled by the =
GP-IB
>Bus?
>
>I once thought about doing that also, but I have decided it was more
>practical to use RS232 with a 16F877 which has 5 different I/O ports.
>
>
>GP-IB bus has 24 Pins, that may not leave you with much Digial I/O left.
>

All 24 pins of the GPIB cable are already defined. You can't do your
own direct digital I/O on any of them. Sending commands and data over
the bus allows you to send and receive whatever digital I/O you want.

>You might have better luck if you use an IEEE 488 interface chip like =
the
>TMS9914 which is now obsolete.
>
>Check out this URL, they make a replacement for the Texax Instruments =
Chip
>and they may have some application notes on how to interface to the =
GP-IB
>Bus.
>
>http://www.gpib2000.com/
>

National Instruments ( http://www.ni.com ) also makes several GPIB
controller chips as well as the talker/listener chip that would be
used in a device like this.

Regards, Bob

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