1、Has 6 Commands: Designed to have OPEN, CLOSE, MEMENTARY, SELF LOCKING, INTERLOCK, DELAY 6 commands, very useful. 2、Better Control: In commands mode, up to 64 devices can be connected in parallel, which makes the control simpler. 3、Reliable Works: RTU commands support 03, 06, 16 function codes, and the delay can get to 255s in DELAY commands. 4、Practical Uses: Can be applied for PLC output expansion board, smart home, home automation, PTZ CCTV camera, etc. 5、Easy to Install: Comes with a light weight and a compact size as well, the installation can be finished in minutes. Item Type: Relay Module Model: N438B08 Material: PCB Product Features: 1. DC 12V power supply. 2. Standby current (all relays closed) 12MA, 1 relay open 40MA, 2 relays open 68MA, 3 relays open 94MA,4 relays open 122MA,5 relays open 148MA,6 relays open 174MA, 7 relays open 198MA,8 relays open 224MA. 3. Enhanced RS485 interface protection (TVS). 4. OPEN, CLOSE, MEMENTARY, SELF LOCKING, INTERLOCK, DELAY, 6 commands. 5. RTU commands support 03 06 16 function codes. 6. Under the DELAY commands, the maximum delay is 255 seconds. 7. Commands can be made through serial hyper terminal (serial assistant) or POLL and Enter. 8. Under the commands mode, it can support up to 64 devices in parallel. 9. The default baud rate is 9600BPS. The baud rate can be selected through jumpers in 2400 4800 9600 19200BPS. 1 x Relay Module