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Dave70

USB or serial port switching

5 posts in this topic

Hello all,

does anyone know how to, using AutoIT, make a USB port or serial port go high/low?

Reason... I want to create some code to control either a USB cable or serial cable to control a switch or relay.

Any help greatly appreciated.

David

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If you're looking for direct digital I/O as opposed to communicating to a microcontroller over RS232, I believe parallel ports have better hope. Don't know how to best interface AutoIT for that purpose though. Try looking around. You can get USB parallel ports if you need one.

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#4 ·  Posted (edited)

Be aware that neither serial nor parallel ports will be able to drive a typical relay themselves, you will most probably need a power stage driver (transistor). If using a serial line, avoid feeding it directly to the base of a power driver (negative voltage would fry unprotected devices) !

BTW, there are many very cheap I/O boards available offering many possibilities. Look there too!

Edited by jchd

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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Ascend4nt posted a useful UDF (for parallel ports). Check this post:

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:bye: Hey there, was I helpful?

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My Current OS: Win8 PRO (64-bit); Current AutoIt Version: v3.3.8.1

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