I have a serial (TTL) sensor that will be quite a distance away from the Photon (80 feet). I tried connecting the sensor to an RS485 board which is in turn connects to another RS485 board (A to A, B to B, and GND to GND). The second RS485 board is connected to the Photon. I can see the TXD led on…

Extending TTL signals

Jimmie June 25, 2018, 11:19pm 4

Yes, sensor reports in Serial TTL.

Currently, I am testing the setup where the two RS485 boards are 1 feet apart. I can prepare datasheets but here are the boards I am using.

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