2 set 24V 12Ch Digital Input Output UART RS485 Relay Module: 1 set Only Board & 1 set DIN35 Rail Box1. Standby current (all relays closed) 14MA, 1 relay open 41MA, 2 relays open 69MA, 3 relays open 95MA,4 relays open 122MA,5 relays open 149MA,6 relays open 174MA, 7 relays open 198MA,8 relays open 226MA2. 12 photoelectric isolation Input ports (NPN low level active ), the input and output relationship can be set to associated (default) and non-associated through commands. "open" "close" "Momentary" "Self-locking" "Interlock" "Delay" ""Interlock between two channels" 7 Commands3. MODBUS RTU command, Support 03 06 16 function code. Under the "Delay" command, the maximum delay is 255 seconds; 4. MODBUS commands can be made serial HyperTerminal (serial assistant) OR "Modbus Poll" Enter; Under the MODBUS command mode, it can support up to 64 devices in parallel5. The default baud rate is 9600BPS. The baud rate can be selected through jumpers: 2400 4800 9600 19200BPSContact Load: High PowerMaximum load: 10A / 250V AC, 10A / 125V AC, 10A / 30V DC, 10A / 28V DC, 10A / 24V DCProtect Feature: SealedPower Source: DCUsage: General PurposeModel Number: N4D8C12Bus Interface: RS485Operating Voltage: DC 24VInput Channels: 12Output Channels: 12Rail: DIN35Size: 180 x 72 x 20mm(Only PCB Board) & 184 x 88 x 42mm(with Din Rail Box)Colour:GreenMaterial:PlasticPackage Contents:2 x Relay ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.