NEX DMS4080 Controller

The NEX DMS4080 Controller is a general purpose hardware platform for data acquisition and control. It features an RS-485 communications port, 4 resistive/digital inputs, and 8 binary outputs.

Digital Outputs

The NEX DMS4080 features 8 binary outputs which deliver a 12VDC voltage typically used for switching interposing relays. DO5 to DO8 are capable of PWM output.

Specifications

Channels	8 (4 are PWM capable)
Type	Open collector
Output voltage	12VDC
Maximum total current	350mA For example: 8 x 43mA (275Ω), or 1 x 350mA (33.3Ω).
Protection	Over current and short circuit protection designed to limit permanent hardware damage. Note: overloading the outputs can cause the controller to shutdown, reset, or malfunction in other ways.

Resistive/Digital Inputs

The NEX DMS4080 features 4 resistive/digital inputs which can measure a resistive analogue value such as a 10kΩ thermistor, or a digital signal such as a switch.

Specifications

Channels

4

Types

Resistance range of 0.1Ω to 200kΩ.

Typical inputs

Temperature sensor 10kΩ NTC thermistor.

Analogue dial potentiometer input.

Volt-free contact (status switch, reed switch, etc).

Supervised digital input (break and short detection).

Pulse counting input.

RS-485 Communications Port

The NEX DMS4080 features an RS-485 communication port to allow reading from other devices using Modbus RTU.

Specifications

Speed	9600 or 19200 baud
Load	8th unit load (support for up to 256 devices on LAN)
Duplex	Half-duplex (2-signal lines)
Isolation	2500 Vrms for 1 minute. ± 15 kV ESD protection. > 25 kV / µs common-mode transient immunity.