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Vrf- Serial communications to an external switch circuit.

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.