I was looking at an article on debricking an OpenWRT router using it's serial interface by hooking it up to a Raspberry PI when I realized that my old RadioShack 22-812 Digital Multimeter also has a serial interface; so is it possible to read / store readings from it using my Raspberry PI with Raspberian on it using the same serial interface?
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Possibly.
Remember that the Pi's UART is 3V3 TTL (low 0V, high 3.3V) whereas true serial RS232 is -25V for low and +25V for high which would destroy the Pi.
Check the electrical specs for the serial interface used by the multimeter.
Using a serial USB dongle at the Pi end may be safer as that should be 5V and bypasses the Pi GPIO.
joan
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But if RS232 is 25V to -25V then how can a 5V usb dongle survive? – leeand00 Jun 19 '18 at 17:15
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1Unless designed for RS232 it probably will not survive. Hopefully it will be cheaper than buying a new Pi. – joan Jun 19 '18 at 17:40