The RS485 module was tested up to a speed of 115.2 Kbps. I used the MODBUS RTU protocol and EasyBuilder Pro to test it.

One thing to note about the module is that it inverts the DE signal (it needs to switch the RS485 transceiver to transmission mode). This inversion is necessary due to the peculiarities of the galvanic isolator (2Pai Semi π121U31). When power is applied to the device and the DE pin has not yet been initialized, without an inverter, the transceiver will immediately turn on the transmitter (logic 1 will appear at the output of the isolator).

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