Feature: 1. [SIMPLE WIRING] The power module circuit has been repeatedly debugged, the PCB wiring is simple and there is little interference. 2. [16 IN 16 OUT] 16 channel input can remotely control 16 channels of output of another board via RS485 bus (relevant registers need to be set). 3. [6 COMMANDS] With 6 commands, namely open, close, instantaneous, self locking, interlocking and delay, with strong functionality. 4. [EASY INSTALLATION] The expansion board is small and compact, with mounting holes, DIN35 and C45 rail installation design​​​​​​​. 5. [WIDE APPLICATIONS] Widely used in smart homes, security surveillance, identification systems, network cameras and LED light drivers, etc. Specification: Item Type: Expansion Board Material: PCB Model: N4D3E16 2. Working Current: 8-50MA 3. 16 channel isolated input ports (NPN is active at low level) 4. 16 channel Darlington outputs (ULN2803 NPN output) 5. 6 commands of open, close, instantaneous, self locking, interlocking and delay 6. 16 channel input can remotely control the 16 channel output of another board through the RS485 bus (relevant registers need to be set) 7. For RTU instruction, support 03 06 function codes (some registers support 16 function codes) 8. Under the Delay command, the maximum delay is 255 seconds 9. You can press Enter in the serial port super terminal (serial port assistant) 10. Up to 64 devices can be connected in parallel 11. The default baud rate is 9600BPS, and the baud rate can be selected by jumpers: 2400 4800 9600 19200BPS Maximum Load: The maximum load current of each channel is 300MA DIN Rail Box Parameters: Model: UM72 Color: Green Width: Suitable for PCB board width UM72 (Approx. 72mm / 2.8in) Insulation Grade: Flame retardant VO grade Backplane Length: Suitable for approx. 100mm / 3.9in PCB board Installation Method: DIN35 and C45 rails Application: PLC IO expansion board, smart home, home automation, PTC camera, security surveillance, identification system, network camera, LED light driver, automatic curtain control . Package List: 1 x Expansion Board Note: Please use it within the specified voltage and current range.