The difference between a "serial bus" and a "serial interface" and a "network protocol" is blurring -- see network protocols (TCP/IP, telephone, CANbus, ethernet, etc.), serial IO (RS485, SPI, etc.).
Lost somewhere in the
sands of time was an interesting serial protocol used on TI graphing calculators.
There's plenty of good reference material on Google, but it basically worked
Two bidirectional lines with pull up resistors. The sender starts by pulling one line low, the receive end acknowledges by pulling the other line low. They both release and start again. Zero's and ones were signified by which line the sender pulled low. Works _very_ well in a busy processor since every bit waits for an ack. Data rate could be quite high with the addition of interrupts if so inclined. Opto isolation may be more challenging, but seems workable.+
TI calculator protocol. +
|file: /Techref/busses.htm, 6KB, , updated: 2015/11/24 12:39, local time: 2017/3/28 03:02,
|©2017 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.piclist.com/techref/busses.htm"> Communication Busses</A>
|Did you find what you needed?|
PICList 2017 contributors:
o List host: MIT, Site host massmind.org, Top posters @20170328 RussellMc, IVP, James Cameron, Van Horn, David, Neil, alan.b.pearce, Sean Breheny, Bob Blick, Josh Koffman, Brent Brown,
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
Welcome to www.piclist.com!