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1) Get the pin diagram for RS232
2) Connect the ground pin(pin 7) to the(-ve) of the multimeter
3) Then connect what ever pin you want to measure to the (+ve) of the multimeter
1) Get the pin diagram for RS232
2) Connect the ground pin(pin 7) to the(-ve) of the multimeter
3) Then connect what ever pin you want to measure to the (+ve) of the multimeter
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. I already did that before I asked on the forum but I get 0V on all the signals :|.