Communication Interface Cards for Industrial Control

Product Specifications

Technical details and manufacturing context for Communication Interface Cards

Definition

Communication interface cards are specialized hardware components installed within supervisory control computers to facilitate bidirectional data transmission with industrial equipment, sensors, actuators, and control networks. They serve as the physical and protocol translation layer between the computer's internal processing system and various industrial communication standards. These cards convert digital signals from the computer's bus into appropriate electrical, optical, or wireless signals compatible with specific industrial protocols such as Modbus, Profibus, and Ethernet/IP. They handle data framing, error checking, and protocol-specific communication tasks to ensure reliable data exchange in industrial environments. Key parameters include the number of channels (2–16), data rate (0.3–1000 Mbps), interface protocols (RS-232/422/485, CAN, Ethernet), isolation voltage (1000–3000 V DC), operating temperature (-40 to 85 °C), storage temperature (-55 to 125 °C), humidity (5–95% RH non-condensing), ingress protection (IP30–IP67 per IEC 60529), supply voltage (5–24 V DC), power consumption (1–5 W), dimensions (120×80 to 200×120 mm), weight (50–200 g), and MTBF (100,000–500,000 hours). Materials typically include printed circuit boards, integrated circuits, and connectors. These cards are used in industrial automation, process control, and supervisory control and data acquisition (SCADA) systems. When selecting a card, verify compatibility with the field devices and the supervisory computer's bus architecture. Confirm model-specific values for all parameters with the manufacturer or supplier, as the ranges provided are reference values. Also verify compliance with relevant standards for your application. Proper installation and configuration are essential for reliable operation. Regular monitoring of communication status and error logs can help detect issues early. In case of failure, check for loose connections, power supply stability, and environmental conditions. Always consult the manufacturer's documentation for troubleshooting and maintenance procedures.

Working Principle

Communication interface cards operate by bridging the internal data bus of a supervisory control computer with external industrial networks. They receive parallel digital data from the computer's bus, buffer it, and convert it into serial or parallel signals conforming to the selected protocol (e.g., RS-232, Modbus). The card's microcontroller or ASIC handles protocol framing, error detection (e.g., CRC), and timing. For isolation, opto-couplers or transformers provide galvanic isolation up to 3000 V DC. The card then transmits the signal via appropriate transceivers to the physical medium (copper, fiber, or wireless). Incoming signals are similarly converted back to bus-compatible data. The card manages multiple channels, each independently configurable, and may support hot-swapping. It also handles electrical protection against surges and ground loops.

Common Materials

Printed Circuit Board (PCB), Integrated Circuits, Connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Number of Channels	2–16	Determines how many devices can be connected simultaneously.
Data Rate	0.3–1000 Mbps	Higher rates for real-time control and large data volumes.
Interface Protocol	RS-232/422/485, CAN, Ethernet	Select based on field device compatibility.
Isolation Voltage	1000–3000 V DC	Protects against ground loops and surges.
Operating Temperature	-40–85 °C	Industrial grade for harsh environments.
Storage Temperature	-55–125 °C	Non-operating survival range.
Humidity	5–95 % RH	Non-condensing; condensation may cause short circuits.
Ingress Protection	IP30–IP67	Higher IP for dusty or wet environments.IEC 60529
Supply Voltage	5–24 V DC	Typical industrial power rails.
Power Consumption	1–5 W	Affects thermal management and power budget.
Dimensions	120×80–200×120 mm	Compact size for space-constrained panels.
Weight	50–200 g	Lightweight for easy mounting.
MTBF	100000–500000 h	Reliability indicator for continuous operation.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Protocol Processor
Handles communication protocol encoding/decoding and data processing

Material: semiconductor
Physical Layer Interface
Converts digital signals to appropriate electrical/optical signals for transmission

Material: copper/optical components
Bus Interface Part
Connects the card to the computer's internal bus system (e.g., PCI, PCIe)

Material: gold-plated connectors
Isolation Circuitry
Provides electrical isolation between computer and industrial equipment for safety

Material: optical isolators/transformers

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Supervisory Control Computer

View system integration details

Manufacturers of Communication Interface Cards

Manufacturer profiles associated with Communication Interface Cards.

Sourcing Communication Interface Cards from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What are the typical interface protocols supported by communication interface cards?

Common protocols include RS-232, RS-422, RS-485, CAN, and Ethernet. The specific protocols supported depend on the card model. Always verify compatibility with your field devices and network infrastructure.

How do I choose the right number of channels for my application?

The number of channels determines how many devices can be connected simultaneously. Cards typically offer 2 to 16 channels. Assess the number of devices you need to connect and consider future expansion. Confirm the exact channel count with the manufacturer.

What is the significance of isolation voltage in these cards?

Isolation voltage protects against ground loops and electrical surges by providing galvanic isolation between the computer and the field side. Values range from 1000 to 3000 V DC. Higher isolation is beneficial in harsh industrial environments. Verify the required level for your installation.

Can these cards operate in extreme temperatures?

Industrial-grade cards typically operate from -40 to 85 °C and can be stored from -55 to 125 °C. However, actual performance depends on the specific model and environmental conditions. Always check the manufacturer's specifications for your application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Communication Interface Cards

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	N/A (electronic component)
other spec:	Humidity: 10-90% non-condensing, Vibration: 5-500 Hz at 2G max
temperature:	0°C to 70°C (operating), -40°C to 85°C (storage)

Communication Interface Cards

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards