Brand: ExpertDAQ

ExpertDAQ EX9044D RS485 Digital I/O Module

Name: ExpertDAQ EX9044D RS485 Digital I/O Module – Manual & Quote
Brand: ExpertDAQ

Description

Overview

The ExpertDAQ EX9044D is a remote digital I/O module with an RS485 interface, combining 4 isolated digital inputs with 8 open-collector digital outputs in a single DIN-rail device. It is part of the ExpertDAQ EX-9000 series of industrial data acquisition and control modules, communicating over the RS485 bus using the ExpertDAQ ASCII command protocol (the companion EX9044D-M variant is the Modbus RTU version of the same hardware). The module lets PLCs, SCADA systems, and industrial PCs read digital signals and drive loads such as relays, solenoid valves, and indicator lamps from a distance of up to 1200 metres.

Seven Star LLC supplies the ExpertDAQ EX9044D digital I/O module for automation and instrumentation projects across the Sultanate of Oman and the GCC. Water and wastewater, power, oil and gas, and industrial plant rely on distributed I/O for remote status and control, and our team provides genuine ExpertDAQ hardware with regional delivery to Muscat, Sohar, Salalah, and beyond.

Operating Principle

In a distributed I/O architecture, input and output points are located close to the field devices they serve, and the control system communicates with the modules over a serial network. The EX9044D sits on the RS485 bus: its 4 isolated digital inputs sense the state of switches, proximity sensors, limit switches, and relay contacts, while its 8 open-collector outputs drive external loads. The host controller — a PLC, industrial PC, or SCADA RTU — polls the module with ASCII command strings to read input states and write output states, or with Modbus RTU function codes where the EX9044D-M variant has been specified.

Each open-collector output can sink up to 375 mA, with a maximum load voltage of 30 V, enough to energise most industrial relays and small solenoids directly, and per-channel LEDs give immediate visual feedback of input and output states during commissioning and troubleshooting. The module is addressable and multiple units can share one RS485 network.

Engineering Design of the ExpertDAQ EX9044D

The EX9044D is engineered for industrial environments: DIN-rail mounting, isolated inputs, and a wide operating temperature range for installation in cabinets and control rooms across the region. Its RS485 interface supports up to 256 modules on a single network with a maximum cable length of 1200 metres, and the concise ASCII command set makes integration straightforward with the majority of industrial controllers and SCADA packages, with the EX9044D-M variant available wherever a native Modbus RTU slave is required.

Digital inputs are isolated to protect the module and the controller from ground loops and electrical noise, which are common in industrial plants. Low input impedance and a defined logic-low threshold of under +1 V make the inputs compatible with standard 24 V DC industrial sensor and contact circuits.

Key Features

The ExpertDAQ EX9044D is specified for remote digital monitoring and control in industrial installations. Its defining characteristics are:

4 isolated digital inputs and 8 open-collector digital outputs in one module.
Outputs rated at a maximum load current of 375 mA and a maximum load voltage of 30 V for direct drive of relays and small loads.
RS485 communication using the ExpertDAQ ASCII command protocol; Modbus RTU is provided by the EX9044D-M variant.
Up to 256 modules addressable on a single RS485 network.
Maximum network cable length of 1200 metres.
Per-channel status LEDs for fast commissioning and diagnostics.
Wide operating temperature range for industrial cabinet installation.
Supplied by Seven Star LLC for automation projects across Oman and the GCC.

Industrial Applications

The EX9044D brings digital I/O to the point of use in industries where field devices are spread over large plants. Typical applications include monitoring pump run/standby status and fault contacts in water and wastewater stations, valve position feedback in process plants, motor starter status in power distribution, and alarm and trip contacts in oil and gas facilities. Its open-collector outputs drive indicator lamps, alarms, and relay coils that start and stop auxiliary equipment.

Seven Star LLC supports automation engineers across the Sultanate of Oman and the GCC with the ExpertDAQ EX9044D and the complete EX-9000 series. We provide modules on request with network planning guidance, so that distributed I/O projects from Muscat to Salalah are built on documented components.

Technical Specifications

The following table summarises the key parameters of the ExpertDAQ EX9044D digital I/O module:

Parameter	Specification
Model	ExpertDAQ EX9044D
Product type	RS485 digital I/O module
Digital inputs	4, isolated
Digital outputs	8, open-collector, max load 375 mA at up to 30 V
Protocol	ASCII command protocol over RS485 (Modbus RTU on the EX9044D-M variant)
Modules per network	Up to 256
Maximum cable length	1200 m
Input logic level 0	Below +1 V
Input logic level 1	+4 V to +30 V
Power supply	10 to 30 V DC, 1.7 W maximum
Isolation voltage	3,750 V
Baud rates	1,200 to 115,200 bps
Operating temperature	-25 °C to +75 °C

Electrical and Environmental Specifications

The ExpertDAQ EX9044D accepts an unregulated supply of 10 to 30 V DC and draws a maximum of 1.7 W, which means it can normally be powered from the same 24 V DC rail that feeds the field sensors it is monitoring without adding a dedicated power supply to the panel. Input channels are isolated to 3,750 V, a margin that matters in switchyards, pump houses and motor control centres where induced transients on long field cables are the usual cause of I/O module failure. The digital input thresholds are defined as logic 0 at below +1 V and logic 1 across the +4 V to +30 V band, which makes the module directly compatible with 12 V and 24 V DC contact and sensor circuits without interposing relays.

Serial communication is selectable from 1,200 up to 115,200 bps, so the network baud rate can be traded against cable length and the number of nodes sharing the bus. The specified operating temperature range of -25 °C to +75 °C covers unconditioned enclosures in Omani summer conditions, although installers should still avoid mounting the module directly above heat-generating power supplies or variable speed drives inside a sealed cabinet. Per-channel LED indication on both the input and output sides remains the fastest commissioning aid in the field: a technician can confirm that a field contact has closed and that the corresponding output has been driven without connecting a laptop to the bus.

Request a Quote for ExpertDAQ EX9044D RS485 Digital I/O Module

Request a formal quotation for the ExpertDAQ EX9044D digital I/O module through the Seven Star LLC RFQ portal, and our team will confirm availability, lead time and delivery to Oman or any GCC destination. As a trusted supplier of ExpertDAQ data acquisition hardware in the region, we also provide datasheets, serial protocol and integration guidance, and project support. Contact Seven Star LLC today.

Network Planning for EX9044D Modules

When planning a distributed I/O network, assign each EX9044D a unique address, use proper RS485 wiring practice with correct termination, and verify that the total network length stays within the 1200 metre limit. The ASCII command protocol integrates the module with PLCs and SCADA systems — or Modbus RTU if the EX9044D-M variant is ordered — and the per-channel LEDs simplify commissioning.Seven Star LLC supplies this item on request with the manufacturer documentation, and availability and lead time are confirmed at quotation.

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About brand

ExpertDAQ is the name on the EX9000 series of remote I/O modules and converters made by TOPSCCC, a Taipei company founded in 1987. The modules add analog and digital channels to a PC or controller over an RS-485 bus. Seven Star LLC, an independent supplier in Oman, lists the EX9520 isolated converter, the EX9017F analog input module, the EX9044D digital I/O module and the EX9188E5-M embedded controller.

ExpertDAQ EX9000 module families

The manufacturer sorts the EX9000 modules by function: converters, digital input and output modules, relay and solid state output modules, analog input and output modules, and counter and frequency modules. They communicate on RS-485 using Modbus RTU, and a separate group of MTCP models has an Ethernet port. The EX9188 series are small embedded controllers that can run a program locally. A typical small system uses one EX9520 to connect the RS-485 line to a serial port and a row of I/O modules behind it.

Ordering ExpertDAQ modules: what we need

Send the full model number with every suffix letter, since suffixes separate versions with a display, a faster input or a different protocol. State the protocol your software expects, the signal types and ranges, and the number of channels. For expansions of existing panels in the GCC, tell us the modules already on the bus so the new ones are requested with compatible settings.

Browse ExpertDAQ products by category: Industrial Communications.

Frequently Asked Questions

What is the ExpertDAQ EX9044D?

The EX9044D is an RS485 digital I/O module from the ExpertDAQ EX-9000 series with 4 isolated digital inputs and 8 open-collector digital outputs rated 375 mA at 4-30 V.

Which protocol does the EX9044D use?

The EX9044D communicates over RS485 using the Modbus RTU protocol, compatible with most PLCs, industrial PCs, and SCADA systems.

How many EX9044D modules can be networked?

Up to 256 modules can be addressed on a single RS485 network, with a maximum cable length of 1200 metres.

What loads can the EX9044D outputs drive?

The open-collector outputs sink up to 375 mA at 4-30 V, sufficient to energise industrial relays, indicator lamps, and small solenoids directly.

Does Seven Star LLC supply ExpertDAQ modules in Oman?

Yes. Seven Star LLC supplies genuine ExpertDAQ data acquisition and control modules, including the EX9044D, throughout the Sultanate of Oman and the GCC with regional delivery and technical support.

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