Feature: 1. RS485 Interface: This 32 channel relay module with RS485 interface adopts RTU protocol, inbuilt power isolation, ADI magnetic isolation, self recovery fuse and TVS protection circuit. 2. Flash On/Off Function: This RTU relay module supports configurable device address (1 to 255), multi devices can be cascaded on RS485 bus. Features flash on, flash off function, it is possible to turn on the relay for a while and then close it automatically via the command. 3. Resettable Fuse: This RS485 relay module has onboard resettable fuse and TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, provides over current/over voltage proof, lightningproof and anti electrostatic. 4. Rail Mount Case: This RTU RS485 relay module adopts rail mounted ABS case, easy to install, safe to use. 3 LED indicators for indicating the MCU status and signal transceiving status. 5. High Safety: This industrial relay module has onboard dedicated relay driver chip, with inbuilt freewheeling diode protection, the driving ability is strong and more stable. Reverse proof circuit, prevent the circuit from being damaged accidentally by incorrect connection. Specification: Item Type: RTU Relay Module Material: ABS Communication Interface: RS485 Communication Baud Rate: 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 Default Communication Format: 9600,N,8,1 Number of Relays: 32 Channel Contact Type: One Normally Open, One Normally Closed Protocol: Standard RTU Protocol RS485 Address Settings: 1 to 255 Indicator Light: STA: MCU Indicator which Flashes When The MCU is Working Normally TXD: Sending Indicator. Indicator is on When Sending Data RXD: Receiving Indicator. Indicator is on When Receiving Data Product Size: Approx. 300 x 290 x 110 x 100mm / 11.8 x 11.4 x 4.3 x 3.9in ( Manual Measurement, Slight Error May Exist ) Product Size: Approx. 10.8 x 59.1mm / 0.4 x 2.3in ( Manual Measurement, Slight Error May Exist ). Package List: 1 x RTU Relay Module Note: 1. This product must be used by professional electricians or technicians. Please take protective measures such as electricity safety, anti leakage and insulation during use.2. Before installing, maintaining, or replacing relay equipment, be sure to turn off the power and unplug it.3. Do not attempt to disassemble the relay device to avoid damage to the device or the risks of electric shock.4. Please install and place the relay equipment properly. Do not use it in humid, overheated or flammable environments to avoid safety accidents caused by careless installation or use.