1: Operating Voltage : DC 8-25V(DC 9V 12V 15V 24V) 2: Operating Current : 10-14MA 3: MODBUS RTU support 03 06 function code 4: V1(CH1) channel voltage measurement range is 0-5V, V2(CH2) channel voltage measurement range is 0-10V, C1/C2(CH3/4) channel current measurement range is 0-20MA/4-20MA 5: Voltage resolution is 0.01V, measurement accuracy is 1%; current resolution is 0.1MA, measurement accuracy is 1%; if the error is 1%, it can be calibrated 6 :MODBUS commands can be made serial HyperTerminal (serial assistant) OR Enter; 7 :Under the MODBUS mode, it can support up to 247 devices in parallel 8 :Size: 45 x 30 x 15mm 9 :Weight: 11 g Application 4-20MA/0-20MA Sensor Voltage/Current analog acquisition Automated industry ,Home Automation ; Identification system; RS485 Remote monitoring; Multimeter voltmeter Electronic Measuring Instruments Colour:White Material:PCB board + electronic accessories Package Contents: 1 x N4AIA04 4 Channel Voltage/Current analog acquisition RS485 module Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.