Features: The meter can measuring voltage,current and environmental temperature at the same time. The meter can measure 0~30V of voltage range and 0~3A of current range and -10~100℃ of temperature range. The meter support standard RTU protocol and its communication mode is RS485. The meter can set 1~255 of equipment address through software setting. Two kinds of connection mode can meet your different needs. Specification: Voltage Range:0~30V Current Range:0~3A(Please enhance the heat dissipation ability while measuring large current over 60℃) Temperature Range:-10~100℃(1% Accuracy) Accuracy:1%(+- 1 digit,the larger the range, the lower the accuracy) Support standard RTU protocol. RS485 communication mode Product Size:47.8 * 28.8 * 30mm / 1.88 * 1.13 * 1.18in Installation Hole:45 * 25.5mm / 1.77 * 1in Weight: 28g/0.99oz Package List: 1*Meter Interface Description: Label A and B terminals are RS485 interfaces for communication. GND is voltage negative pole,INN measures the negative pole of current load.When VCC is dependent powered,the tested power supply is positive and independent power supply is the positive pole of module power supply, VIN independent measured voltage positive, load positive. Test instructions: 1. Connecting hardware Connect RS485 serial port, A connects A, B connects B, and connects to the measured voltage. 2. Software settings: Set the serial port number in "Communication Settings" and open the serial port. Set the module address in the "Analog Acquisition" item (the default address is "1". If the module address is not known, the module address can be changed in the "Module Address Change" item) Click on the "Acquisition" command in "Analog Acquisition". If "Communication Error" appears, confirm whether the A and B terminals of the RS485 interface are reversed. 1、The meter can measuring voltage,current and environmental temperature at the same time. 2、The meter can measure 0~30V of voltage range and 0~3A of current range and -10~100℃ of temperature range. 3、The meter support standard RTU protocol and its communication mode is RS485. 4、Two kinds of connection mode can meet your different needs. 5、The meter can set 1~255 of equipment address through software setting.