N4D3E16 16-Channel Bidirectional Digital I/O RS485 Modbus RTU Module

N4D3E16 16-Channel Bidirectional Digital I/O RS485 Modbus RTU Module

The N4D3E16 16-Channel Bidirectional Digital I/O RS485 Modbus RTU Module is a remote I/O module featuring 16 digital inputs and 16 digital outputs, designed for industrial automation and remote digital I/O control systems.

The module is equipped with 16 opto-isolated NPN digital inputs and 16 NPN digital outputs based on ULN2803 Darlington transistors. Each output channel supports a maximum load current of 300mA.

Supporting standard RS485 Modbus RTU communication, the N4D3E16_PRO enables the reading of digital inputs and the control of outputs via PLCs, HMIs, computers, or microcontrollers with RS485 capability.

Modbus function codes 03, 06, and 16 are supported.

Specifications

• Operating Voltage: 7–25V DC
• Compatible Power Supplies: 9V / 12V / 24V DC
• Number of Digital Inputs: 16 channels
• Number of Digital Outputs: 16 channels
• Total I/O Configuration: 16DI + 16DO
• Input Type: NPN digital input
• Input Isolation: Photoelectric / optocoupler isolation
• Output Type: NPN transistor, open-collector type
• Output Driver IC: ULN2803 Darlington transistor array
• Maximum Output Current: 300mA / channel
• Operating Current: Approx. 7–50mA
• Communication Interface: RS485
• Communication Protocol: Modbus RTU
• RS485 Terminals: A+ / B-
• Default Baud Rate: 9600bps
• Supported Baud Rates: 1200 / 2400 / 4800 / 9600 / 19200 / 38400 / 57600 / 115200bps
• Modbus Function Codes: 03 / 06 / 16
• Modbus Network Capacity: Up to 64 devices
• Maximum Delay Time: 255 seconds
• Address Setting: Via DIP switch
• Remote Tx/Rx Setting: Via DIP switch
• PC-free Board-to-Board Control: Supported
• PLC Remote I/O Transfer: Available
• Direct Input-to-Output Control: Supported
• RS485 Surge Protection: TVS protection