Dual Channel RS-485 Tophat
https://www.waveshare.com/2-ch-rs485-hat.htm
This is the top circuit board that provides the BC gateway with two RS-485
channels. I do NOT know what we have available for software applications
on the BC gateway, but we should be able to use these for Modbus/RTU,
Protocol A or B and Hart. And, it should be possible to do different protocols
on the two different channels at the same time.
There are five LEDs available.
PWR indicates if the board has power.
RXD1 & TXD1 indicates when data is being received & transmitted on
channel 1.
RXD2 & TXD2 indicates when data is being received & transmitted on
channel 2.