Is it possible to use on Edison 2 devices that uses UART tx rx? I know on Edison we have 1 TX 1 RX. But what if i want to use GROVE GPS and GROVE GPRS at the same time, is it possible to 'emulate' GPIO pins as TX RX pins?
If you disconnect the USB-to-Serial FTDI chip, you can connect 2 Serial devices.
Otherwise, an UART-to-I2C adapter could be easier to use. It's essentially Arduino with two ports. I don't know if it needs programming and I'm not sure about the voltage level. The Atmel microcontroller should work on 1.8V.