1、Use serial port to USB to communicate, suitable for many scenes and professionals. The serial port baud rate, control commands can be set by the user, which increases the flexibility of use. 2、It has strong anti‑interference ability and adopts diode freewheeling protection. The contact part adopts double‑sided thick wiring, which can be used for large current to pass through, which is safe and reliable. 3、Equipped with a pull-in indicator, the working status of the relay is clear at a glance. Each relay output leads to two sets of normally open and normally closed electric shocks, which is convenient and flexible to use. 4、Both input and output use 5.08mm high‑quality wiring terminals, which is more convenient for wiring and suitable for PLC control. There are fixing screw holes for easy installation. 5、It has additional functions such as relay status query and relay automatic memory function selection, which is convenient and flexible to use. Item Type: Relay Module Material: PCBPurpose: Industrial control, motor control, switch control, LED control Relay Contact Capacity: AC 250V 10A, DC 30V 10A Default Command Format: Channel 1 open: Ox00 Oxfl Oxff, close: 0x00 0x01 Oxff Channel 2 open: 0x00 0xf2 Oxff, close: 0x00 0x02 Oxff Channel 3 open: 0x00 Oxf3 Oxff, close: 0x00 0x03 Oxff Channel 4 open: 0x00 0xf4 Oxff, closed: 0x00 0x04 Oxff Channel 5 open: 0x00 0xf5 Oxff, close: 0x00 0x05 0xff Channel 6 open: 0x00 0xf6 Oxff, close: 0x00 0x06 Oxff Channel 7 open: 0x00 0xf7 Oxff, closed: 0x00 0x07 Oxff Channel 8 open: 0x00 0xf8 Oxff, closed: 0x00 0x08 Oxff All channe open: 0x00 Oxf9 Oxff, close: 0x00 0x09 0xff. 1 x Relay Module 1 x USB Connecting Cable