Feature: 1. 4 CHANNEL RELAY: Multifunctional RS485 relay module, 4 channel design, which has excellent performance, stable connection and less interference. 2. COMMAND SETTING: The input and output can be set to various association modes by commands, and the baud rate also can be selected by commands. 3. DEVICE PARALLEL: In command mode, up to 64 devices can be connected in parallel, and you can press Enter through the serial hyperterminal (serial port assistant). 4. MULTIPLE FUNCTION: The relay module has no parity, even parity and odd parity multiple methods, hardware reset function and TVS anti surge protection. 5. WIDE APPLICATION: The 4 channel relay module has a compact structure and is widely used in industrial automation and electrical equipment control, etc. Specification: Item Type: 4 Channel Relay Module Working Voltage: DC 12V Standby Current: 11MA 1 Relay Open: 30MA 2 Relays Open: 49MA 3 Relays Open: 65MA 4 Relays Open: 82MA Default Baud Rate: 9600BPS Selectable Baud Rate by Command: 2400, 4800, 9600, 19200, 38400, 57600, 115200BPS Maximum Data Sending and Returning Time: 1000ms Parity Mode: No parity, even parity and odd parity Hardware Reset Function: Yes TVS Anti Surge Protection: Yes. Package List: 1 x Relay Module Note: Pay attention to the correct operation.