Serial Interface: Temperature Range -40°C to +85°C

Component Specifications

Definition

A standardized serial communication interface component in Industrial IoT Gateways that enables bidirectional data exchange between modern IoT systems and legacy industrial equipment. It implements asynchronous serial protocols (RS-232, RS-422, RS-485) with industrial-grade electrical isolation, supporting data rates up to 115.2 kbps over distances up to 1200 meters. The interface includes surge protection, ESD shielding, and galvanic isolation up to 2500V RMS for harsh industrial environments.

Working Principle

Converts parallel data from the gateway's processor into serial bit streams using UART (Universal Asynchronous Receiver/Transmitter) technology. Implements voltage-level shifting and differential signaling (for RS-422/485) to transmit data as sequential electrical pulses over twisted-pair cables. Includes error detection through parity bits and supports multi-drop configurations (RS-485) for connecting multiple devices on a single bus.

Materials

PCB: FR-4 glass epoxy laminate with 2oz copper; Connectors: Industrial-grade DB9 or terminal blocks with gold-plated contacts; Isolation: Optocouplers (6N137) for signal isolation, DC-DC converters for power isolation; Protection: TVS diodes (SMBJ series), gas discharge tubes, ferrite beads; Housing: Aluminum alloy with IP67-rated sealing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Data Rate	300 bps to 115.2 kbps
Protocols	RS-232, RS-422, RS-485
Connector Type	DB9 female or screw terminal
ESD Protection	±15kV (air), ±8kV (contact)
Surge Protection	1kV (line-to-line), 2kV (line-to-ground)
Isolation Voltage	2500V RMS
Operating Voltage	5V DC ±10%
Temperature Range	-40°C to +85°C

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

Standards

ISO/IEC 8482, TIA/EIA-232-F, TIA/EIA-422-B, TIA/EIA-485-A, IEC 61000-4-2, IEC 61000-4-5

Parent Products

This component is used in the following industrial products

Industrial IoT Gateway

The Industrial IoT Gateway is a ruggedized edge computing device designed for industrial environments.

View Product Details

Engineering Analysis

Risks & Mitigation

Electromagnetic interference in high-noise environments
Ground loop currents causing communication errors
Cable length exceeding specifications causing signal degradation
Incorrect termination causing signal reflections

FMEA Triads

Trigger: Voltage transients from industrial equipment
Failure: Interface circuit damage
Mitigation: Implement multi-stage protection (TVS diodes, gas tubes, ferrites) and regular surge testing

Trigger: Moisture ingress in harsh environments
Failure: Corrosion and short circuits
Mitigation: Use IP67-rated connectors and conformal coating on PCB

Trigger: Improper cable shielding
Failure: EMI-induced data errors
Mitigation: Specify shielded twisted-pair cables with proper grounding

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Signal timing: ±2% of bit period; Voltage levels: ±5% of specified values; Isolation resistance: >100MΩ at 500VDC

Test Method

IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), IEC 61000-4-5 (Surge), TIA/EIA-485-A electrical characteristics test

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.

Manufacturers of Serial Interface

Manufacturer profiles associated with Serial Interface.

Sourcing Serial Interface 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.

Related Components

Marking Ink

Specialized ink for permanent identification on surface mount resistors during manufacturing.

Dielectric Layer

Insulating layer in surface mount capacitors that stores electrical energy through polarization.

Optical Window

Transparent optical component for light transmission in polycarbonate lens housings

PCB Substrate

PCB substrate is the foundational insulating layer that provides mechanical support and electrical connectivity for electronic components in high-speed memory modules.

Frequently Asked Questions

What is the maximum cable length for RS-485 communication?

Up to 1200 meters at 115.2 kbps with proper termination and cable quality (24 AWG twisted pair).

Can this interface connect to Modbus devices?

Yes, it supports Modbus RTU protocol over RS-485 for connecting PLCs, drives, and sensors.

How many devices can connect to a single RS-485 port?

Up to 32 unit loads (256 devices with high-impedance transceivers) in multi-drop configuration.

Data Basis

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

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.

Serial Interface