1、4 Channel Module: Acquisition of 4 analog inputs 0/4‑20mA, 0‑5V, 0‑10V, optional 4 PT100 or PT1000 RTD temperature; using 16 bit AD acquisition processing, high measurement accuracy. 2、Communication Mode: Communication protocol adopts standard for Modbus RTU mode, good compatibility and easy programming. RS485 communication interface with ESD protection circuit. 3、Intelligent Measurement: The maximum and minimum values of analog input can be configured, and the actual values can be converted intelligently for easy application to various analog measurement requirements. 4、Professional Manufacturing: Industrial grade chip with built in watchdog to ensure reliability. With wide working voltage DC9‑36V, and with anti reverse protection function. 5、Installation: Support wall mounting or 35mm standard DIN rail mounting, multiple wiring methods, with LED indication of working status, easy for you to install and debug on site. Item Type: Industrial RTU 4 Channels Relay Module Material: Metal 3) Overload capacity: 1.2 times the range can be sustained; instantaneous (<1s) 3 times the range without damage. Communication interface 1) Interface type: RS-485 communication interface 2) Communication protocol: for MODBUS RTU standard protocol 3) Communication address: 1-247 can be set 4) Data format: software settable, n,8,1; e,8,1; o,8,1; n,8,2 5) Communication rate: settable 1200, 2400, 4800, 9600, 19200, 38400, 115200 Bps. Measurement accuracy: ±0.2% FS. 1.3.5 Isolation: not isolated (non-isolated type, all signals common GND). 1.3.6 Power supply Operating environment 1) Operating temperature: -20-+70℃; storage temperature: -40-+85℃. 2) Relative humidity: 5 to 95%, no condensation (at 40℃.). 3) Altitude: 0 to 3000 meters. 4) Environment: no explosive and conductive dust, no significant shaking, vibration and shock places. Temperature drift: ≤100ppm/℃. Installation: wall mounting or 35mm standard DIN rail mounting Module Size: Approx. 110 x 84 x 30mm / 4.33 x 3.31 x 1.18in 1 x Module 1 x USB Adapter 1 x Guide Buckle 3 x Screw 2 x Terminal 1 x Power Adapter 1 x Instruction Card