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

Hello ALL,

I just obtained a Rc880 led sign (CPU Version 2.0) and browsed the internet for info. It seems that not much is available.  I got the sign because I like to tinker electronically  :-)   and I do need some info like:

1. Manual, cable configuration, software, etc .... but I'll settle for item 2 only.

2. What is the power supply output voltage?  I can use a 15V 5A Power supply that I have since a 5V regulator keeps the CPU happy, but it seems that the TIP 126 transistor collectors get the full input voltage from the PS.
This voltage is then applied to the LEDs, so I really need to know the volts output of the Power Supply.

A phone jack seems to be the RS232 programming connector.  One of the wires is open, one goes to ground, one goes to a bus driver output (74LS244 IC-9 pin 12) and one goes to what appears to be a level shifter and goes to a bus driver input (74LS244-IC9 pin 13).  Does the RC880 output data to the software via RS232?  The output from IC-9 could be a signal level to the software that a sign is connected ????

I downloaded the files provided by Manic Pony, thanks Mac. I'll try it out as soon as I get the PS voltage info.

By the way, the place I got this sign has at least 4 more available, w/o PS or cable.  I think these RC880s only have red leds.

Thanks,
Rich

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