I have a system giving an RS 232 output with logical 0 at +15V and logical 1 at -15V. Is this signal safe to connect to the serial port of a computer? If not how do I use this for a computer input? and to which pin should I connect it. Please Help! Urgent! Thanks
The short answer is yes, it is safe.
The longer answer is not to experiment on ports you can't fix like the ports integrated into you laptop or motherboard.
Your PC serial port is designed to accept voltages which meet the RS232 specification.
Try Googling for keywords like:
RS232 min max voltage RS232 pc serial port pinout
You will find hundreds of sites answering your question.
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