75175, LTC489 Quad RS485 line receiver. +----------+ +---------------+ 1B1 |1 +--+ 16| VCC | A-B | OE| Y | 1A1 |2 15| 2B2 |-------+---+---| 1Y1 |3 14| 2A2 |>+200mV| 1 | 1 | 1OE |4 13| 2Y2 |<-200mV| 1 | 0 | 1Y2 |5 75175 12| 2OE | X | 0 | Z | 1A2 |6 11| 2Y1 +---------------+ 1B2 |7 10| 2A1 GND |8 9| 2B1 +----------+ [This information is part of the GIICM]