Re: [CAD_CAM_EDM_DRO] Re: Troubleshooting a BTR

vinnygenovese wrote:

>Thanks for your insights. I have taken the board apart as per your suggestions
>and found the UCM logo was painted over the first markings on the large chip
>just like you guessed. The original markings are close to gone but I can make
>out the lowest line GFSX904 5 or S. On the back it says Malasya. I have
>found the trademark (tm) MICRO-BTR on the back, but they must have gone
>under in the pre-internet days (nothing on google but one reference to UCM
>in LA.).
>
>

Hmm, well, maybe it is a microprocessor after all.

>The dip switch settings on the top dip switch seem to control baud rate, the
>traces for that chip go to one SN74LS165N. When I change these settings the
>LED blinks out the new baud rate after a reset.
>
>

Yeah, I forgot this bit about the LED digit showing the baud rate
setting. That pretty
much confirms it is a micro, not a UART.

>I also learned that if I type into my terminal like a madman and change comm
>settings on the fly, sometimes I can get it to lock up and the LED blinks out a
>steady 0. The BTR dip switch's came set up for 1200 so I assume a 1979
>Faunc 5T defaults to that baud rate ? .
>
>

I think the BTR uses a parallel connection between the CNC control and
the BTR,
since it is emulating the paper tape reader. The baud rate would be for
the serial
communications between the PC and the BTR.

Jon