In SX Microcontrollers, SX/B Compiler and SX-Key Tool, rich2006jag wrote:

In my previous post I stated that the TIP126 collectors got the full power supply voltage ... I was wrong  :confused:  .
The collectors go to the LED rows and the emitter gets the regulated 5V.  I connected my 15V power supply and the sign displayed .. something.. it seems to be going through the ROM data since it displays some graphics sometimes ..(steaming boat). 
Well, it's a start.   I ran the program I downloaded and found that it outputs serial data to COM1 or COM2, selectable.  At the top right corner it displays the com port and the baud rate (300).  The output is at RS232 levels so the board input does have a level shifter.
Wire inputs to the board: yellow=serial data in, red=gnd, black is output from board at logic level, not RS232,
green is open.
When I send a message with the software, I can see that data output at the PC RS232 pin 3 (db9 connector).
I have to make a cable, using the above info, to see what role the output from the board plays. I suspect it may be a DSR signal, but if it is required, why does the software output data with no signal at the DSR pin ???
More questions!

I'll post my findings later.
rich

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