I have a signal as process current 24v, 7.5mA - the current does not vary - it is there or not.
To get this to a serial port, can I simply use an inline 22k resistor to drop the voltage and instead of measuring voltage drop just look for 7.5 v or 0 v ... can a serial port (usb to serial converted) handle this?
If so, is there any way to effect a "trigger" input level and ignore source current below 1mA?
Thanks!
To get this to a serial port, can I simply use an inline 22k resistor to drop the voltage and instead of measuring voltage drop just look for 7.5 v or 0 v ... can a serial port (usb to serial converted) handle this?
If so, is there any way to effect a "trigger" input level and ignore source current below 1mA?
Thanks!
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