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Vrf-Serial Communications to external switch.

Question asked by VRFuser on Nov 26, 1996

Martin McCurry,
Condensed Matter and Materials Science Division,
Department of Pure and Applied Physics,
Queen's University,


Vrf-Serial Communications to external switch.

27th November 1996.

HP-VEE Users,

I am writing a program to measure the resistivity of a thin film as the temperature is reduced.....part of this program involves the use of a relay switch,
which must be operated during the loop of the HPVee program. Therefore, I would like to do this using the I/O routines incorporated in HPVee. My idea
is to use one of the com ports of the computer as the link to the switch circuit. By configuring a direct I/O object for serial communications, I can send a
logical high signal to the switch via a serial link by using the command EXECUTE BREAK. I think this should be enough to throw the switch.

I would be grateful if anyone could point out any flaws in this plan, or indeed if they know of an alternative solution to this problem, I'd like to hear it! I am
using HPVee Version 3.0 on a 386 computer, using Windows 3.1.

Thanks! (in advance),

Martin McCurry.