dtr and rts signal on rs232 with pic

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adnan_merter

adnan_merter

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hi all,

i have an optic probe which communicates with mcus or pcs via rs232
but it doesnt have a power supply or any power source (battery) integrated, it requires dtr and rts signal of serial port to power up.

i already try this probe on pc and it worked with dtr and rts signal enabled.

but i have to use it with pic, and i dont know how i can provide dtr and rts signals,

anybody having an idea please help,

thanks
 

Hi adnan_merter,

First, dtr and rts are output signals from the PC. So your probe is powered by these line, you probably just have to feed your probe with a voltage between 5V and 9V (applied on DTR or RTS).
In RS232 a logic low is a voltage between 3 and 25 Vdc and a logic high is a voltage between -25 and -3Vdc
 

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