1. Size: About 87.8 x 40.51 x 2.03mm 2. Weight: About 38g 3. Communication chip: MAX 232 4. Power supply voltage: DC7~DC36V wide voltage universal 5. Communication protocol format: Serial port 232 communication is used, the protocol is very simple, the source program of the single-chip microcomputer is provided, which is convenient for everyone to transplant, and the serial port assistant can be used 6. Send character type: - A11T relay 1 is turned on, and A10T relay 1 is turned off; - A21T relay 2 is turned on, and A20T relay 2 is turned off; - Communication format: (9600, 8, NONE, 1) Baud rate: 9600, 8 bits, no parity, 1 stop bit