Sherwood UC projector

Sherwood UC has two video projectors. One at the front for the congregation to see and one at the back for the minister etal to see. 

Many years ago, Tim S built a box to control them. Recently it had all stopped working. 

Tim called to ask if I would help. 

I was very happy to go to his place to look at the box. 

Eventually we decided we needed to go to the church to see if there was a problem there. That was an emotional baggage trigger for me. Went anyway. 

First off located a broken wire in a D9 gender bender. Wow isn't that a now un pc term.

Fixed that by soldering a new plug on the wire that had the wrong gender plug. However I still could not control the rear projector.  

Today Friday 31 March, 

We temporarily installed a new D9 cable. Initially that did not work. I was following the projector manual that said the comms was at 38400bps.  I thought I'd try 9600 and it worked. 

In the end the issue was, Tim had thought there was a issue with his box and had changed the CPU chip and installed a program that followed the documentation AND the documentation was wrong AND there had been a broken wire. 

FRONT PROJECTOR
9600 BPS
Projector ON $02 $41 $44 $5A $5A $3B $50 $4F $4E $03
              $02 $41 $44 $5A $5A $3B $50 $4F $46 $03
Ask          $02 $41 $44 $5A $5A $3B $51 $50 $57 $03

02 A41 D44 Z5A Z5A ;3B P50 O4F F46  03  02 P50 O4F F46  03
02 A41 D44 Z5A Z5A ;3B P50 O4F F46  03




REAR PROJECTOR
NEC  AT 9600 BPS
Ask $00 $85 $00 $00 $01 $01 $87
ON  $02 $00 $00 $00 $00 $02
OFF $02 $01 $00 $00 $00 $03


Already OFF
Send OFF command
Command                      Response
  02  01  00  00  00  03 -->  A2  01  01 @40  02  00  00  E6
  Now Turn ON
  02  00  00  00  00  02 --> "22  00  01 @40  00 c63
And OFF  but nothing happens
  02  01  00  00  00  03      A2  01  01 @40  02  02  0D  F5
  Actually on with blue light steady on
  02  01  00  00  00  03     "22  01  01 @40  00 d64