Date   : Mon, 11 Apr 1988 14:35:00 CST
From   : OPTON@uhvax1.uh.edu
Subject: correction on X-10 remote controller/RS coco.

It is with some chagrin that I must retract my original assertion 
that the Radio Shack #26-3142 remote controller was just a BSR
unit with the name changed.  After some experimenting with my units I
can confidently say that the RS unit COMPLETELY IGNORES YOU if you try to
talk to it using RS232 voltage levels.

After making this determination, I opened up both units to look inside.
Both use the 80C48 microcontroller.  Both use 6116-2 RAM.  In fact, most
of the 
components are the same.  This is to be expected.  So, I guess the only 
hardware design difference is in the computer interface circuitry.  The 
BSR unit has a 5 pin DIN receptacle that the cable to the computer
plugs into via a D-25-to-5-pin-DIN-plug adapter cable, and it is in the
same place as the DIN plug on the RS unit.  Perhaps, and I offer 
this only as sheer speculation, the pin functions on the DIN receptacle 
on the RS unit vis a vis I/O are the same as the functions on the DIN
receptacle on the BSR unit, and the only difference is the voltage 
levels they operate at.  If this is the case, here are the pinouts on my 
BSR unit (which operates on RS-232 voltage levels).


5 pin DIN                              RS-232  (DTE?)
(on BSR unit)                     

2                                      7       gnd
4                                      2       transmit data
5                                      3       receive data

1 and 3 appear 
to be unconnected.


There is a good possibility that the control codes in the RS unit are the 
same as the codes in the BSR unit, so my offer to mail a copy
of my BSR X10 Programmers Reference still stands, if anyone is interested
and will send me a USmail address.

Once again, my apologies for the wrong info.

Lee Thomison
BITNET: OPTON@UHVAX1
landline: (713) 749-3127

all concievable disclaimers apply.