Path: utzoo!utgpu!water!watmath!clyde!att!rutgers!rochester!ritcv!cci632!ccicpg!felix!dennisg
From: dennisg@felix.UUCP (Dennis Griesser)
Newsgroups: sci.electronics
Subject: Another Sync&Gate X-10 Interface
Message-ID: <46785@felix.UUCP>
Date: 8 Jul 88 22:27:16 GMT
Sender: daemon@felix.UUCP
Reply-To: dennisg@felix.UUCP (Dennis Griesser)
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The May/June '88 issue of "Circuit Cellar Ink" carried an article called
"Power-Line-Based Computer Control" which described the internals of
X-10's PL513 module.  This is a no-frills controller that feeds sync
pulses to the computer and uses a gate signal from the computer to
impose the X-10 carrier on the line.

If you are seriously considering building one of these from scratch, instead
of buying the assembled unit, you might be better advised to read:

  Computer Digest - May 1986 - "Remote Power Controller For Your C-64"
	This is a "sync-and-gate" interface that works like the commercial
	PL513 unit.  The advantage is that it much simpler to build:
	5 transistors, a 556, and some R&C.  It, too, features optical
	isolation on both signals.  Only one program is provided.  It is
	a C-64 BASIC program that pokes a machine-code subroutine into
	RAM and calls it.  Luckily, the software in "Circuit Cellar Ink"
	(May/June '88) should work with this unit.