1、Multi Channels: 4 switching outputs with 4 relay normally open contacts, and its contact capacity is 5A/; 4 switching inputs, support both active or passive null contact input (both compatible). 2、Communication protocol: Communication protocol adopts for Modbus RTU standard mode, which has good compatibility and is easy to program. 3、Safety Improvement: Our RS‑485 communication interface is equipped with ESD protection circuit, and has wide working voltage at DC 9‑36V with anti reverse protection function. 4、Convenient and Practical: Industrial grade chip with built in watchdog to ensure reliability, and with LED light to indicate working status, which is easy to install and debug on site. 5、Easy to Install: Adopt wall mounting or 35mm standard DIN rail mounting, multiple wiring methods, convenient for field installation and wiring. Item Type: Multi Channel DIN DO to RS485 Module Material: Metal Output Type: 4 digital inputs + 4 relay outputs, support pulse counting and TTL / pulse output Communication Interface Type: RS-485 Communication Protocol: For MODBUS-RTU standard protocol Communication Address: 1-247 can be set Data Format: Software settable, "n, 8, 1", "e, 8, 1", "o, 8, 1", "n, 8, 2" Communication Rate: 1200, 2400, 4800, 9600, 19200, 38400, 115200 Bps. Working Environment Operating Temperature: -20 - +70℃; Storage Temperature: -40 - +85℃. Relative Humidity: 5-95%, No Condensation (at 40℃). Altitude: 0 - 3000m. Environment: No explosive, corrosive gases and conductive dust, no significant shaking, vibration and shock of the place Mounting method: Wall mounting or 35mm standard DIN rail mounting Module size: 110 x 84 x 30mm / 4.33 x 3.3 x 1.18in 1 x Modules 1 x USB Adapter 1 x Guide Buckle 3 x Screw 2 x Terminal 1 x Power Adapter 1 x Instruction Card