Feature:1. 20 CHANNEL RELAY: 2 channel digital input (PNP active high), 1 channel 020MA current analog input, 1 channel 010V voltage analog input, 20 channel 10A relay switch output.2. COMMAND MODE: Support standard commands, command 1 (default) write 06 or 16 read 03, command 2 (solder M0 jumper) write 05 or 06 or 15 or 16 read 01 or 02 or 03 or 04.3. MULTIPLE FUNCTIONS: With hardware reset function and TVS surge protection, the default baud rate is 9600BPS, can be selected by Command 2400 4800 9600 19200 38400 57600 115200BPS.4. CHECK FUNCTION: Parity check can be no parity, even check and odd check, the time of data transmission and return can be set, the maximum value is 1000ms.5. WIDE APPLICATION: This relay module can be used in smart home, home automation, PTC cameras, surveillance identification systems, network cameras, LED light drivers, etc.Specification:Item Type: Relay Control BoardBackboard Length: Approx. 240mm or 9.4inInsulation Grade: Flame retardant VO gradeBackboard Length: Suitable for 239mm PCB boardMounting: DIN35 and C45 RailsStandby Current: All relays off 14MA, 1 relay on 40MA, 2 relays on 69MA, 3 relays on 95MA, 4 relays on 122MA, 5 relays on 149MA, 6 relays on 174MA, 7 relays on 200MA, 8 relays turn on 226MA, and so on.Package List:1 x Relay Control Board