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Re: led sign
finger to keyboard and composed:

Measure the voltages. If the interface is RS232, then you may see
+/-12V or similar. As a rule, unless there are pull-up resistors, any
pin carrying +/-12V will be an output. An examination of the interface
chip(s) may also shed some light on the interface type. If the
keyboard is powered from the interface, check for +5V and ground.
I don't know if this URL will be of any help:
http://www.signweb.com/stmg/forum/viewtopic.php?p14%0221&sid=5ecdafa04390f83db35822598678fa34
- Franc Zabkar
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Please remove one 'i' from my address when replying by email.
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