QUICK QUESTION about voltage
How many volts am I supposed to have on PIN2 on the DB9?
I have 9.91v, is this correct or no? THanks |
I havn't measured it, but usually the highest seen on an rs-232 ouput is 5v. 10 volts could fry your serial port on the PC, so be careful.
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PIN1 = 5.00v
PIN2 = 9.91v PIN9 = 5.00v PIN3 = 0.00v (why>????) THese are the voltage readings I got |
If PIN2 is either one of TX,RX (the digital signals) then 9.91v might be ok since with a voltmeter you can't get an accurate voltage level from a digital signal. IIRC the correct "on" voltage for serial ports is 12V, which is very noisy resistant.
Jim |
Thanks Reverant.
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