RS485 Communication Module

Product Specifications

Technical details and manufacturing context for RS485 Communication Module

Definition

The RS485 Communication Module is an electronic device that facilitates serial communication using the RS485 standard, which is widely adopted in industrial automation and control systems. It enables reliable data exchange between multiple devices over long distances with high noise immunity, supporting multi-point network configurations where multiple transmitters and receivers can be connected on a single bus. This module typically converts signals between RS485 and other interfaces like RS232, USB, or Ethernet, making it essential for integrating various industrial equipment such as PLCs, sensors, and actuators into a unified communication network. The module is designed for use in harsh industrial environments, with features such as galvanic isolation, surge protection, and wide operating temperature ranges. It supports baud rates from 300 to 115200 bps, operates at 3.3 to 5 V, and can connect 32 to 256 nodes on a single bus. The maximum communication distance is 1200 meters, and the module provides 2500 V isolation voltage. It operates in temperatures from -40 to 85 °C and can be stored from -55 to 125 °C. The module is rated for humidity from 5 to 95% RH (non-condensing) and offers ingress protection from IP30 to IP65 depending on the enclosure. It supports a data format of 8N1 (8 data bits, no parity, 1 stop bit) and includes a 120-ohm termination resistor (built-in or external). ESD protection is rated at ±15 kV per IEC 61000-4-2. The typical module footprint is 20×15×5 mm and weighs approximately 5 g. The module is constructed with a printed circuit board, integrated circuits, and connectors. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.

Working Principle

The RS485 Communication Module operates by converting digital data from a host device (e.g., a microcontroller or computer) into differential voltage signals as per the RS485 standard. It uses a balanced differential line driver to transmit data over a twisted-pair cable, where the voltage difference between the two wires represents logical states, providing high noise rejection. On the receiving end, a differential receiver interprets these voltage differences to reconstruct the original data. The module supports half-duplex or full-duplex communication, often incorporating features like automatic direction control, galvanic isolation, and surge protection to ensure reliable operation in harsh industrial environments.

Common Materials

Printed Circuit Board (PCB), Integrated Circuits (ICs), Connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Baud RateRequired	300–115200 bps	The speed of data transmission in bits per second
Operating VoltageRequired	3.3–5 V	The voltage range required for the module to function properly
Number of NodesRequired	32–256 units	Maximum number of devices that can be connected on the RS485 bus
Communication DistanceRequired	1200 m	Maximum cable length for reliable data transmission
Isolation Voltage	2500 V	Voltage isolation rating for protection against electrical noise and surges
Operating Temperature	-40–85 °C	Industrial grade
Storage Temperature	-55–125 °C	Non-operating
Humidity	5–95 % RH	Non-condensing
Ingress Protection	IP30–IP65	Depends on enclosureIEC 60529
Data Format	8N1	8 data bits, no parity, 1 stop bit
Termination Resistance	120 Ω	Built-in or external
ESD Protection	±15 kV	Human body modelIEC 61000-4-2
Dimensions	20×15×5 mm	Typical module footprint
Weight	5 g	Approximate

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

RS485 Transceiver IC Part
Converts logic-level signals to RS485 differential signals and vice versa

Material: Semiconductor silicon with plastic or ceramic packaging
Termination Resistor Part
Prevents signal reflections at the end of the transmission line

Material: Carbon or metal film resistor
Isolation Transformer
Provides galvanic isolation to protect against ground loops and electrical noise

Material: Ferrite core with copper windings
DB9 or Terminal Block Connector Part
Interface for connecting the module to external devices and cables

Material: Plastic housing with metal contacts
LED Indicators Part
Visual status indicators for power, transmit, and receive activities

Material: Plastic lens with semiconductor light-emitting diode
Surge Protection Optional
Clamps line surges to protect the transceiver in harsh environments.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for RS485 Communication Module.

Manufacturers of RS485 Communication Module

Manufacturer profiles associated with RS485 Communication Module.

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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

Procurement Evaluation Criteria

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Technical documentation

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Frequently Asked Questions

What is the maximum number of nodes that can be connected to an RS485 bus using this module?

According to the directory reference, the module supports 32 to 256 nodes on a single bus. The exact number depends on the specific model and driver characteristics, so verify with the manufacturer.

What is the maximum communication distance for reliable data transmission?

The directory lists a maximum communication distance of 1200 meters. Actual distance may vary based on cable quality, baud rate, and environmental conditions; confirm with the supplier.

Does the module provide galvanic isolation?

The module is specified with an isolation voltage of 2500 V, indicating galvanic isolation capability. This helps protect against electrical noise and surges. Verify the isolation rating for your specific model.

What are the operating temperature limits?

The module is rated for industrial use with an operating temperature range of -40 to 85 °C. Storage temperature is -55 to 125 °C. Ensure your application environment stays within these limits.

Data Basis

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

Preliminary Technical Classification

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voltage:	5V DC ±5%
humidity:	5% to 95% non-condensing
data rate:	Up to 10 Mbps
temperature:	-40°C to +85°C
isolation voltage:	2500V RMS

Product Specifications

Industry Taxonomies & Aliases

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