SPECIFICATION Power module: +5V Module size: 55mmx53mm(2.16"x2.08") 16 digital IO port (including a I2C interface) 6 analog IO port and power Operation and programming mode switch Automatic and manual transceiver mode switch (When in manual transceiver mode, the enable end is the 2nd digital IO port) Transceiver indicating LED Standard RS485 interface, mini RS485 interface and RS485 pins Welding area Reset switch PH2.0 sensor interface for DFRobot RS485 series sensor: URM04 Ultrasonic sensor