Rail-Mount Serial Server, RS485 to WIFI/Ethernet Module, Modbus MQTT Gateway

SKU: 21968
Part Number: RS485 TO WIFI/ETH
Brand: Waveshare


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Rail-Mount Serial Server, RS485 to WIFI/Ethernet Module, Modbus MQTT Gateway
RS485 to WIFI/Ethernet Module

Rail-mount RS485 serial server

Modbus Gateway

MQTT Gateway

Features at a glance

This is a RS485 device data acquisitor / IoT gateway designed for industrial environment. It combines multi functions in one, including serial server, Modbus gateway, MQTT gateway, RS485 to HTTPD Client, etc. With RS485, WIFI and Ethernet ports, the module can realize functions such as serial to WIFI, serial to Ethernet, Ethernet to WIFI and so on. Using screw terminals for power input, it supports 5~36V wide range power supply. Rail-mount V0 flame-retardant case design, small in size, easy to install. It is suitable for applications like data acquisition, IoT gateway, safety & security IoT, and intelligent instrument monitoring...

Communication interface RS485, screw terminal
Power supply 5 ~ 36V DC, screw terminal
Case PC + ABS, V0 flame retardant grade
Dimensions L × W × H: 109.66 × 28 × 64.71 mm
Ethernet 10 / 100M auto-negotiation RJ45 connector
WIFI 802.11b/g/n compliant
Serial port RS485 interface (Anti-surge, Lightningproof, Over-current protection)
Wireless specification
Frequency Band 2.412 ~ 2.484 GHz
Wireless network Station / AP / AP+Station Mode
Security mechanism WPA-PSK / WPA2-PSK
Encryption type TKIP / AES
Transmitting power 802.11b: +19dBm ([email protected])
802.11g: +18dBm ([email protected])
802.11n: +17dBm ([email protected], MCS7); +17dBm ([email protected], MCS7)
Receiving sensitivity 802.11b: -89dBm (@11Mbps)
802.11g: -81dBm (@54Mbps)
802.11n: -73dBm (@HT20, MCS7); -71dBm (@HT40, MCS7)
Serial specification
Baudrate 300 ~ 460800 bps
Parity bit none, odd, even, mark, space
Data bit 5 ~ 9 bits
Flow control N/A
Protocol TCP / UDP / ARP / ICMP / DHCP / DNS / HTTP / MQTT
Configuration host, web browser, serial AT command
Communication method TCP/IP direct communication, VCOM
Operating mode Transparent transmission, serial command, HTTPD Client, Modbus TCP to Modbus RTU
Environment requirement
Operating temperature -40℃ ~ 85℃
Storage temperature -45℃ ~ 125℃
Humidity range 5% ~ 95% relative humidity

Primary function

Support RS485 to WIFI, RS485 to Ethernet, Ethernet to WIFI, etc.

Rail-mount Serial Server

Industrial Rail-mount Support, Easy to Install, Compact Size, Cost-effective

Function Block Diagram
Support Transparent Transmission Mode

Supports TCP Server / TCP Client / UDP Server / UDP Client

Serial Command Mode

The user sends data to the server according to the protocol
Send data to different servers without restarting

Support HTTPD Client Mode

After the user has set the HTTP header through AT commands or web page, the module can send data to the HTTP server, or obtain data from the HTTP server

Support MQTT function

Devices can subscribe to other MQTT client messages, and can publish topic information to the server. Supports subscription of 6 messages and publication of 6 topics, wider range of use and more applicable scenarios. Users can view device-related information through terminal devices or cloud platforms

Modbus Gateway support

Support Modbus TCP and Modbus RTU interconversion mode

AT command mode

The user can query the current status of the module, or set related parameters, by sending AT commands

Multi Configuration Methods
Supports muliti configuration methods such as hosts, Web Browser and serial port Configuration

Socket Distribution Protocol
In the transparent transmission mode, the serial device can send data to the specified Socket link; the network data of each Socket is sent to the serial device through the serial port.

Hardware Protection
ESD Level 4 Static Protection, Level 3 Surge Protection, EFT Level 3 Electrical Fast Transient/Burst Protection.

Customized registration packets, heartbeat packets
The registration package is used to identify the device information to the server, so that the server can identify the device.
Interface introduction
Outline dimensions
Resources & Services
Selection guide
 RS485 TO ETHRS485 TO ETH (B)RS485 TO POE ETH (B)RS232 TO ETH (B)RS232 TO POE ETH (B)RS232/485/422 TO ETH (B)RS232/485/422 TO POE ETH (B)RS485 TO WIFI/ETHRS232/485 TO ETH
RJ45 Ethernet 10/100Mbps auto-negotiation
POE - supported - supported - supported -
WIFI interface - 802.11b/g/n 2.4GHz -
Type RS485 RS232 RS232/485/422 RS485 RS232+RS485 (allows concurrent operation)
Baudrate 600bps~230.4Kbps 300bps ~ 115.2Kbps 300bps ~ 460.8Kbps 600bps~230.4Kbps
Hardware flow NOT supported supported
Data bit 5, 6, 7, 8
Stop bit 1, 2
Parity bit None, Even, Odd, Space, Mark
Interface protection
Power supply reverse-proof, ESD protection, anti-surge
Ethernet 1.5KV electromagnetic isolation
RS485 2KV ESD protection, 2.2KΩ pull up/down registers 2KV anti-surge 600W anti-surge, lightningproof, anti-electrostatic 15KV anti-surge, lightningproof, over-current protection 2KV ESD protection, 2.2KΩ pull up/down registers
Other - - Power isolation, signal isolation protection - lightningproof, over-current protection
Operating mode
Type TCP Server, TCP Client, UDP Server, UDP Client, etc.
TCP Server customizable 1~16 Clients supports 30 Clients supports 24 Clients supports 2-ch Socket, 8 Clients per ch
Features customized heartbeat packets, customized registration packets, customized webpage, RFC2217-like protocol, KeepAlive, timeout auto reboot, short connection, firmware upgrade via network
- Modbus gateway, MQTT/JSON to Modbus Modbus gateway, MQTT, HTTP Client Modbus gateway, Websocket (webpage to serial)
Configuration Built-in webpage, Host computer config software, Serial commands
Power supply 5~7V 9~24V 6~36V 5~36V
Operating current [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]
Operating temp. -25~75℃  -40~85℃ 

Weight: 0.157 kg

Quick Overview

Power supply is not included, it is recommended to use a 12V Industrial DIN-Rail Power Supply
  1. RS485 TO WIFI/ETH x1
  2. Antenna x1