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2-Ch RS485 to RJ45 Ethernet Serial Server, Dual channels RS485 independent operation, Dual Ethernet Ports - Waveshare 24963


This is a 2-ch RS485 device data acquisitor / IoT gateway designed for the industrial environment. Dual RS485 can work simultaneously without interfering with each other. It combines multi functions in one, including serial server, Modbus gateway, MQTT gateway, RS485 to JSON, and network switch

If you want to know more about this product, please check the Wiki Page.


If you have any questions on this product please feel free to contact us.

*Disclaimer: The images are merely illustrative.

2-CH-RS485-TO-ETH-B-details-1.jpg 2-CH-RS485-TO-ETH-B-details-3.jpg

Features at a glance

This is a 2-ch RS485 device data acquisitor / IoT gateway designed for the industrial environment. Dual RS485 can work simultaneously without interfering with each other. It combines multi functions in one, including serial server, Modbus gateway, MQTT gateway, RS485 to JSON, and network switch. The module features dual RS485 and dual Ethernet ports (PoE function optional), uses a DC port (outer diameter: 5.5mm, inner diameter: 2.1mm) and screw terminal for power input. The case with rail-mount support, is small in size, easy to install, and cost-effective. It is suitable for applications like data acquisition, IoT gateway, safety & security IoT, and intelligent instrument monitoring...




2-CH RS485 + PoE network port + Electrical isolation
Product Type Serial server, Modbus Gateway, MQTT Gateway
Basic Function Bi-directional transparent data transmission between RS485 and Ethernet
Communication interface RS485 port × 2, Ethernet port × 2
Power supply DC 5.5 power port, 6 ~ 45V DC screw terminal, or PoE port
Isolation Protection Power isolation, Signal isolation

Ethernet RJ45 with PoE support, IEEE 802.3af compliant
10 / 100M auto-negotiation RJ45 connector, 2 KV surge protection
Serial port Isolated RS485 (the 2 channels can receive and transmit independently at the same time)

Serial specification
Baudrate 300 ~ 115200 bps
Parity bit none, odd, even, mark, space
Data bit 5 ~ 9 bits
Flow control N/A

Configuration host, web browser, device management functions library
Communication method TCP/IP direct communication, VCOM
Operating mode TCP server, TCP client (coexisting with TCP server), UDP, UDP multicast

Environment requirement
Operating temperature -40℃ ~ 85℃
Humidity range 5% ~ 95% relative humidity
Dimensions L × W × H: 78.0 × 72.5 × 24.2 mm

Resources & Services

Wiki: www.waveshare.com/wiki/2-CH_RS485_TO_POE_ETH_(B)


Package Content

Weight: 0.145 kg

  1. 2-CH RS485 TO POE ETH (B) x1

Primary function

bi-directional transparent data transmission between RS485 and Ethernet


Multi Power Supply Options

Support PoE Ethernet port power supply*, Suitable for IEEE 802.3af PoE standard
Support Screw Terminal and DC Power Port for Power Supply, DC 6~45V
Wide Voltage Range Input




Support Ethernet Port Cascade

Onboard 2-ch Ethernet Ports for communication and cascade
Either one can be used for dual serial server network communication, while the other one can be used for cascading or communication with other devices


* Note: Each module in the cascade needs to be powered individually. The working current of the module is 12V/150mA (MAX) and can be cascaded up to 8.


Rail-mount support

Industrial-grade rail design, compact size, easy installation, cost-effective


Modbus gateway support

suitable for Modbus networking upgrade, Can Be Used With specific Configuration Software


Multi communication modes

supports TCP server / TCP client / UDP multicast / UDP mode

2-CH-RS485-TO-ETH-B-details-17-1.jpg 2-CH-RS485-TO-ETH-B-details-17-2.jpg

* Note: This module is dual-channel, and each channel supports the above functions separately


MQTT/JSON to Modbus

more flexible conversion between different protocols


When used as MQTT gateway, the devices can upload serial data to MQTT server by MQTT protocol through transparent transmission, supported servers including Baidu Cloud MQTT, Alibaba Cloud MQTT, China Mobile OneNet, etc. The acquired Modbus RTU or non-standard serial data can be parsed into JSON format and packaged into MQTTdata packet for uploading.

When used as JSON data acquisition gateway, the devices can be connected to data acquisition instruments through RS485 connection, then acquire data automatically, convert the data into JSON format, and finally post it to server. The acquired data supports Modbus RTU 645 instrument 97 version, 645 instrument 07 version, as well as sorts of non-standard RS485 protocols. The uploaded data format can be configured via host, and the JSON upload protocol can be MQTT protocol, HTTP POST protocol, HTTP GET protocol, and so on.


Multi hosts roll-polling support

Different network devices will be identified and responsed respectively,
No more crosstalk issue while communicating with multi network devices


User-defined heartbeat/registration packet

Easy for cloud communication and device identification


NTP protocol support

Getting network time info for serial output or data upload


Multi configuration methods

Supports Web browser configuration, obtaining dynamic IP via DHCP,
DNS protocol connected domain server address


Multiple Protection, Safe And Stable

Onboard power supply and signal isolation, it can provide stable isolation voltage with high reliability and strong anti-interference. Built-in TVS (transient voltage suppression tube) can effectively suppress the surge voltage and transient peak voltage in the circuit, lightningproof & ESD protection. Built-in resettable fuse and protection diode to ensure stable output of current and voltage, prevents over-current and over-voltage proof, improve shock proof performance


Aluminium Alloy Enclosure

Aluminium Alloy Enclosure With Sand Blasting And Anodic Oxidation
Solid And Durable, Fashion And Good Hand Feeling


Interface introduction


Outline dimensions


Support Batch Customization

Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.


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