Features Automatic Identification: This RS485 serial port digital LED panel meter supports ASCII text and RTU dual protocol automatic identification, no need for user settings. Voltage Range: This digital serial port meter has a wide power supply voltage range between DC7~36V. Four Digit Display: RS485 serial instrument can display 4-digit serial port. LCD Display: This RS485 serial instrument adopts a large display area of 0.56 inches, only 4 digits, and the reading is clearer. Baud Rate: The baud rate of the digital display serial port instrument can be 1200bps/2400bps/4800bps/9600bps/19200bps/38400bps/57600bps/119200bps. Specification: Display Digit:4 Display Size:0.56inch Display Color:Red Power Supply Voltage:DC 7~36V Current:30mA Wiring Diagram: V+ :Power positive GND: Negative power supply A: RS485 BUS A B: RS485 BUS B (note the wiring sequence, first connect the power cable to confirm the module works normally and then connect the communication line) Communication interface: non-isolated, 485 bus and GND terminal common ground. If there are multiple devices on the bus, be sure to connect the terminating resistor to the bus end device. Baud Rate: 1200bps/2400bps/4800bps/9600bps/19200bps/38400bps/57600bps/119200bps Size:79 x 43 x 21.5mm / 3.11 x 1.69 x 0.85in  Installation Size:76 x 39.2mm / 2.99 x 1.54in  Package List: 1 x Meter Package List