Features:Support ASCII text and RTU dual protocol automatic identification, no user setting in required.The meter can display 4 digit of serial port.Large 0.56inch display area for only 4 digit ,more clear.The baud rate can be 1200bps/2400bps/4800bps/9600bps/19200bps/38400bps/57600bps/119200bps.Specification:Display Digit:4Display Size:0.56inchDisplay Color:RedCurrent:30mAWiring Diagram:V+ :Power positiveGND: Negative power supplyA: RS485 BUS AB: 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/119200bpsSize:79 x 43 x 21.5mm / 3.11 x 1.69 x 0.85inInstallation Size:76 x 39.2mm / 2.99 x 1.54inPackage List:1 x Meter