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RS485 to WIFI Converter / Serial Server for IOT Solutions

  • RS485 to WIFI Converter / Serial Server for IOT Solutions
  • RS485 to WIFI Converter / Serial Server for IOT Solutions
  • RS485 to WIFI Converter / Serial Server for IOT Solutions
  • RS485 to WIFI Converter / Serial Server for IOT Solutions
  • RS485 to WIFI Converter / Serial Server for IOT Solutions
  • RS485 to WIFI Converter / Serial Server for IOT Solutions


RS485 to WIFI Converter / Serial Server for IOT Solutions

  • Convert Between RS232/422/485 and WIFI
  • Ethernet port available
  • MIPS MCU with 4MB Flash and 8MB SRAM. Run on eCos
  • Easy ConfigurationThrough a Web Interface or PC IOTManager Tool
  • Support Security ProtocolSuch AsSSL/AES/DES3
  • Support  Web OTA Wirelss Upgrade

Hardware Instruction

The front view of ESP-4 WIFI serial server is shown in Figure1. ESP-4 uses black anti-radiation SECC board. Left and right are with two "ears" to facilitate the installation.


L × W × H = 9.4cm × 6.5cm × 2.5cm

Panel Light:

1) ACT: ACT lights up when green indicates that data is normally transferred between WIFI/Ethernet and RS232/485/422. When the ACT light blinks blue, it indicates that data has been returned from RS232/485/422 to WIFI/Ethernet. If the data is short then blue flashing time is relatively short, need to pay attention to view.

2) LINK: LINK lights are green when the RJ45 cable is connected. When the LINK light is blue, it indicates that the TCP connection is established or is in UDP mode.

3) POWER: Indicates that the serial server is powered on.

4) WIFI: WIFI is blue when it indicates that WIFI has established a wifi connection with router as an STA or as an AP there has wifi establishing a connection with it. When the WIFI light is green: 2 seconds flashes, it indicates that it is in AP mode and no wifi connection is established; It flashes every 5 seconds, indicating that the device is in STA mode and is connecting with the router.

The serial interfaces in front of the server area shown in Figure 4, from left there have:

1) Ethernet port: standard RJ45 interface

2) R-, R+, T+, T-: where T+ is RS485A, T- is RS485B; if you need RS422, you can connect these four lines.

3) Terminal power supply +, -: voltage is 9~48VDC.

4) Power outlet: you can use the standard 5.5mm plug (core for the positive), the voltage 9~48VDC.

The back panel of serial server is as shown in Figure 5, from left there have:

1) WIFI antenna. You can choose to the extending line antenna, easy to install to the outside of the metal cabinet.

2) Reset switch: putting on the reset mode, will reset wifi work mode to the AP mode, SSID, password is empty, IP into

3) Serial port using standard DB9 male: line sequence as shown in Table.

ESP-4104 is a RS485 to WIFI converter/ serial server for IOT solutions., it supports Ethernet and Wifi simultaneous access. The host serial software can self-adapt serial parameters, without setting device serial baud rate.
The ESP-4104 is a high performance serial device server adn WIFI gateway product designed for lightning rsistance, anti-eletromagnetic interface and resisting bad environment requirements. It provides an easy and wireless integration way of modbus TCP and RTU network.

Product parameters



Basic Frequency






Operating System



8KV Isolation

Network Protocol

IP,TCP,UDP,DHCP,DNS,HTTP Server/Client,ARP, BOOTP, AutoIP, ICMP,Web socket, Telnet, FTP,TFTP, uPNP, NTP, SNMP,Modbus TCP

Security Protocol

SSL v3 AES 128Bit DES3


802.11 b/g/n

Network Mode


Transmit Power

802.11b: +20dBm(Max.) 802.11g: +18dBm(Max.) 802.11n: +15dBm(Max.)

Receive Sensitivity

802.11b: -89dBm 802.11g: -81dBm 802.11n: -71dBm

Wi-Fi Security


Antenna Interface

3dBi antenna

Port Number


Interface Standard

RS232: DB9 RS485/RS422: 5.08mm connector

Data Bits


Stop Bit


Check Bit


Baud Rate

TTL: 300 bps~230400bps

Flow Control

No Flow control Hardware RTS/CTS、DSR/DTR Software Xon/ Xoffflow control




Web or IOTManagerPC Software

Virtual Serial

Windows, XP/Vista, 7, Server 2003/2008


95mm x 65mm x 25mm

Operating Temp.

-25 ~ 85°C

Storage Temp.

-45 ~ 105°C,5 ~ 95% RH(no condensation)

Input Voltage

5~36VDC or 9~50VDC

Working Current





1 year


1* Power Adapter 1* Serial Cable 1* Ethernet Cable 1* WiFi Antenna




Interface Standard

1 RJ45



Access Terminal Quantity in AP Mode

Max 32



Wiring and Dimension [mm:]

Eastron Electronic Co., Ltd.

Eastron Electronic Co., Ltd. headquartered in Jiaxing, China, near to Shanghai, Hangzhou, Jiangsu, is one of the leading high-tech manufacturer and supplier for electricity products and energy measurement solutions. Over the years, we have developed a rich range of electricity meters, sensors, communication modules and management systems.Custom Manufacturers of RS485 to WIFI Converter / Serial Server for IOT Solutions.

Eastron keeps investing on the research and development of new technology and new products on electricity metering. We have energetic and innovative development teams in both China and UK,which help us keep the competitive edge in the market. The collaboration with leading universities and institutions also brings many cutting-edge technology into our products. To make sure the reliability of the products, Eastron has setup own professional lab that can performs EMC, LVD, accuracy and environment tests according to IEC, EN, GB, UL standards.

With more than 40 patented technologies on software, embedded software and hardware, Eastron has been awarded with “High-tech Enterprise” and “High-tech R&D Centre of Electricity Application”. Eastron strictly follows ISO 9001 Quality management system, and the production is approved by SGS according to MID standard.Suppliers and Factory of RS485 to WIFI Converter / Serial Server for IOT Solutions

Creating value to and growing up with our partners is our mission. Eastron provides not only the high quality and innovative products, but also first-class service to all our customers. We have professional team for technical supports and aftersales services. We have provided products and services to more than 50 countries in Europe, Asia-Pacific, America, Middle East, and Africa. We pride ourselves on having long long-term partners globally that allows us to further our growth and bring our innovation and quality to the market.

Honor & Qualification

Choose comes from trust, and cooperation
comes from honesty.


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