We have a number of RH-02 units
They need to be powered via the serial lines. The data sheet states:
7 RTS Held at a positive voltage (>7V) to power the RH-02
4 DTR Held at a negative voltage (<-7V) to power the RH-02
I need to be able to power this unit from a machine that does not let me set the DTR and RTS lines. It looks like there is a 5v regulator inside, but I can't find its datasheet...
Does anyone know what input voltage range I can / should apply across the DTR/RTS lines to succesfully power the device?