8 channels relay.
Support modbus pol input.
Under the mobus command mode, it can support up to 64 devices in parallel.
Under the "delay" command, the maximum delay is 255 seconds.
Mobus commands can be made serial hyperterminal (serial assistant) or "modbus poll" enter.
We have here a very impressive product with countless of features that you will surely need! You don't need to be very professional, it;s very easy for you to understand the usage. What more could you ask for? Do not hesitate to ask us for our recommendation to ensure the best possible feature and function that will work out for you! Features: 8 channels relay.  Support modbus pol input. Under the mobus command mode, it can support up to 64 devices in parallel. Under the "delay" command, the maximum delay is 255 seconds. Mobus commands can be made serial hyperterminal (serial assistant)  or "modbus poll" enter.  "Open" "close"  "momentary" "self-locking" "interlock" "delay" 6 commands. Specifications: Supply voltage: DC 12V  Maximum load: 10A / 250V AC, 10A / 125V AC, 10A / 30V DC, 10A / 28V DC, 10A / 12V DC Item size: 90 * 62 * 19.5mm / 3.45 * 2.44 * 0.77in Package size: 90 * 62 * 19.5mm / 3.45 * 2.44 * 0.77in Item weight: 115g / 4.06oz Package weight: 118g / 4.16oz Package lists: 1 * 8CH relay board