Editorial Technical Reference

Serial Interface

This page explains how Serial Interface is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A communication interface that transmits data sequentially, one bit at a time, over a single channel.

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Product Specifications

Technical details and manufacturing context for Serial Interface

Definition
The Serial Interface within a Modbus Gateway serves as the physical and protocol layer for serial communication, enabling the gateway to connect to and exchange data with field devices (such as sensors, actuators, or PLCs) using serial protocols like RS-232, RS-485, or RS-422. It handles the conversion between serial data streams and the internal data representation of the gateway, facilitating integration into Modbus TCP/IP networks. This component is part of the computer, electronic, and optical product manufacturing industry, specifically as a component-level part. The interface typically includes a printed circuit board (FR-4), an integrated circuit (UART or transceiver), copper traces, and a connector (e.g., DB9 or terminal block). Its specifications may include interface type, data rate (baud rate), data bits, stop bits, parity, number of ports, connector type, and isolation voltage. These parameters are application-specific and must be verified with the legal manufacturer or supplier for the actual model. The interface operates by converting parallel data from the gateway's internal bus into a serial bit stream for transmission, and vice versa for reception. It manages timing (baud rate), framing (start/stop bits), error checking (parity), and electrical signaling according to the specific serial standard (e.g., RS-485 for multi-drop networks). Within the Modbus Gateway, it implements the physical layer of the Modbus RTU or ASCII protocol. For selection, consider the required serial standard, data rate, distance, number of devices, and environmental factors such as isolation needs. Verification questions include checking the exact interface type, supported baud rates, connector pinout, and isolation voltage rating. Maintenance signals may include communication errors, data corruption, or physical damage to the connector or PCB. Failure boundaries are limited to the serial interface component itself; other gateway functions are outside its scope. Always confirm model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The interface operates by converting parallel data from the gateway's internal bus into a serial bit stream for transmission, and vice versa for reception. It manages timing (baud rate), framing (start/stop bits), error checking (parity), and electrical signaling according to the specific serial standard (e.g., RS-485 for multi-drop networks). Within the Modbus Gateway, it implements the physical layer of the Modbus RTU or ASCII protocol.
Common Materials
FR-4 PCB, Integrated Circuit (UART/Transceiver), Copper Traces, Connector (e.g., DB9, Terminal Block)
Technical Parameters

What to specify in your RFQ

  • Interface Type (e.g., RS-232, RS-485, RS-422), Data Rate (Baud Rate), Data Bits, Stop Bits, Parity, Number of Ports, Connector Type, Isolation Voltage

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM
  • UART (Universal Asynchronous Receiver/Transmitter) Part
    Converts parallel data from the gateway's processor to serial data for transmission, and serial data from the line to parallel data for the processor.
    Material: Silicon (Integrated Circuit)
  • Line Driver/Transceiver
    Converts the UART's logic-level signals to the appropriate voltage levels and electrical characteristics for the specific serial standard (e.g., RS-485 differential signaling).
    Material: Silicon (Integrated Circuit)
  • Connector
    Provides the physical connection point for serial cables (e.g., DB9, screw terminal block).
    Material: Metal (contacts), Plastic (housing)
  • Isolation Barrier (optional) Optional
    Provides galvanic isolation between the serial interface circuitry and the gateway's internal electronics to protect against ground loops and electrical noise.
    Material: Optocouplers, Isolation Transformers

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Serial Interface.

COM Port RS-232 Port

Applied To / Applications

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

Modbus Gateway
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (electronic interface)
other spec: Data rate: 300 bps to 115.2 kbps (standard RS-232), up to 10 Mbps (RS-422/485)
temperature: -40°C to +85°C (industrial grade)
Media Compatibility
✓ Industrial control systems (PLC communication) ✓ Legacy manufacturing equipment ✓ Point-of-sale terminals
Unsuitable: High-EMI environments without proper shielding
Sizing Data Required
  • Required data transmission rate (bps)
  • Maximum cable length needed
  • Interface standard (RS-232, RS-422, RS-485)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Signal Degradation
Cause: Corrosion or contamination of connector pins, leading to increased electrical resistance and intermittent data transmission failures.
Mechanical Wear
Cause: Repeated mating/unmating cycles causing pin misalignment, bent pins, or connector housing damage, resulting in poor electrical contact.
Maintenance Indicators
  • Intermittent or garbled data transmission despite proper software configuration
  • Visible corrosion, bent pins, or loose connections on the serial connector
Engineering Tips
  • Implement regular cleaning of connector pins with appropriate contact cleaner and protect with dielectric grease to prevent corrosion
  • Use strain relief on cables and ensure proper alignment during mating to prevent mechanical stress on connectors

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO/IEC 21118:2020 - Information technology - Serial interfaces ANSI/TIA-232-F - Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange DIN 66020-1 - Interface for data transmission; serial interface for data terminal equipment

Quoted from the published standard.

Manufacturing Precision
  • Connector pin alignment: +/-0.1mm
  • Signal timing jitter: < 5% of bit period
Quality Inspection
  • Signal integrity test (eye pattern analysis)
  • Environmental stress screening (temperature/humidity cycling)

Manufacturers of Serial Interface

Manufacturer profiles associated with Serial Interface.

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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

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Frequently Asked Questions

What serial standards does this interface support?

The interface can support RS-232, RS-485, or RS-422, depending on the specific model. The exact standard must be confirmed with the manufacturer for the actual gateway.

What are the typical specifications to check?

Typical specifications include interface type, data rate (baud rate), data bits, stop bits, parity, number of ports, connector type, and isolation voltage. These vary by model and application.

How does the interface handle error checking?

It uses parity bits for error checking, as part of the framing. The specific parity setting (none, even, odd) is configurable and must match the connected devices.

Can this interface be used for multi-drop networks?

Yes, if it supports RS-485, which is designed for multi-drop networks. However, the number of devices and cable length must be within the standard's limits and verified with the manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

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

Preliminary Technical Classification
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