Dear, we have a problem whith some ST485BDR. When the 120 ohm load resistor is applied, the pin 1 goes to low state, lighting the green RX LED
This board perform 4 channels UART to RS485/422 conversion, using a FT4232 device and four ST485BDR devices. The issue is present in some channels in aleatory way. When I replace the failed ST485BDR device by the MAX485ESA the issued chanel start to ...