Features Support six working modes, including on, off, yoga, self-lock, interlock and delay, the relay is easy to use. There are two command control modes. The maximum delay of the default command is 255 seconds and the maximum delay under AT command is 9999 seconds. AT command can be entered through the Serial Port Super Terminal (Serial Port Assistant). In the default command mode, the relay can connect up to 64 devices in parallel. Function: 1. Support six operating modes, including power on, off, impulse, self-locking, lock and delay, the relay is easy to use. 2. There are two command control modes. 3. The maximum delay of the default command is 255 seconds and the maximum delay under AT command is 9999 seconds. 4. The AT command can be entered through the serial port super terminal (serial port assistant). 5. In the default command mode, the relay can connect up to 64 devices in parallel. Specification: Item Type:Relay Pattern: R4D3B16 / R4D3B16-R with DIN rail box (optional) Features: Operating Voltage: DC 12V Working current: 13MA standby, 1 relay to 41MA, 2 relays for 69MA, 3 relays for 93MA, 4 relays for 121MA, 5 relays on 149MA, 6 relays to 175MA, 7 relays for 200MA, 8 relays for 225MA etc. Default transmission rate: 9600 BPS Transmission rate selected by jumper: 2400, 4800, 19200 BPS Size: Apx 180 x 72 x 20mm / 7.09 x 2.83 x 0.79 inch (PCB board) Approx. 184 x 88 x 42mm / 7.24 x 3.46 x 1.65 inch (Box with Rail ) Weight: Approx. 230g/8.1oz (PCB) Approx. 358g / 12.6oz (Box with Track) Maximum load: 10A/250VAC, 10A/125VAC, 10A/30VDC, 10A/28VDC, 10A/12VDC DIN rail box parameters: Product model: UM72 Color: green Width: suitable for circuit board width UM72 (72cm) Insulation Class : Fire Retardant VO Level Base plate length: suitable for 18cm PCB board Net Weight: Approx. 128g / 4.5oz Installation method: DIN35 and C45 rail Package List: 1 x RS485 Relay 1 x relay xRS485 (with DIN rail box) Package List 1 xRS485 Relay (with DIN rail box)