16-Channel 2-wire Transmission System by Andy Flind
---------------------------------------------------

Everyday Practical Electronics May, June 2000

This design is a PIC-based 8- to 16-Channel 2-wire on-off signalling
communication link. An optional add-on interface unit extends the
possible options to internal private telephone and intercom systems.

The system communicates through a single pair of wires, in one
direction or in both directions simultaneously. It is ideal for remote
signalling and alarm system monitoring, but it can be applied to
model railroad control, switching advanced lighting displays and many
other uses limited only by one's imagination.

Our circuit is in expandible modular form and each transmitter or receiver uses
one PIC 16F84 per 8 channels.

The latest version of the software is available from
ftp://ftp.epemag.wimborne.co.uk/pub/PICS/

Please refer to the EPE web site for details of ordering back issues,
subscriptions etc. http://www.epemag.wimborne.co.uk

Last updated 5th April 2000.