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Serial WiFi Adapter - RS485 / RS422

  • Model: UCW4842


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This item has been replaced with part number WF485.

With this WiFi serial adapter you can connect any RS485 or RS422 serial device to your computer over a standard WiFi network. This adapter is very similar to our serial RS232 WiFi adapter part UCW232C, the main difference is that this adapter has a RS485 / RS422 interface instead of RS232.

Data can be transferred over TCP/IP, UDP or HTTP with the advantage of using 802.11 b/g/n infrastructure or Adhoc mode (Simple AP / Station Mode) networking which allows you to use existing wireless WiFi network connectivity; and it allow you to connect a standard RS485 or RS422 serial device to any secure or open wireless network or access point.

This WiFi serial adapter is designed around the BCM4390 processor from Broadcom which includes an ARM Cortex-M3 32-bit CPU, which ensures simple and reliable operation and a selection of basic features and available customizable settings for your particular network and application.

The included USB cable can be used to power the adapter however a standard mini USB 110VAC/5VDC power supply adapter can also be used. Alternatively this Serial to WiFi adapter can be powered by a 3.7 - 5.0VDC lithium battery or an external USB battery power pack. Lastly, the adapter can also be powered by 4.5 - 5.0VDC through the screw terminals on the side of the adapter.

The parameters can be configured over WiFi by using any standard web browser.
Virtual COM port software for creating a virtual COM port can be downloaded for free for Windows. This adapter is also compatible with several 3rd party VCOM software.

This adapter is ideal for any home, office, laboratory or light industrial environment and will allow you to connect any serial device to your WiFi network under Windows, iOS, Android and most other mobile WiFi enabled applications.

serial wifi setup

Overall features
  • New generation Broadcom BCM4390 processor
  • Highly reliable ARM Cortex-M3 32-bit CPU
  • Can be powered by: USB, power supply or battery
  • Compatible with all TCP/IP based devices
  • Free downloadable virtual COM port software
  • Supports Secure Wi-Fi
  • Built-in Full TCP/IP stack, no external drivers required
  • Works with most mobile devices / operating systems
  • Parameters configurable by web browser
  • Automatic Data Direction Control
  • Works with ModBus!
  • LED status lights
  • USB power cable included
Included items
  • Serial WiFi adapter
  • USB cable (for power)
  • Di-pole antenna


Useful optional accessories
(not included)

usb power supply
USB mini 110V/5VDC Power adapter

Battery pack
Rechargeable battery pack

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Part number UCW4842
Operating system Virtual COM software available for Windows 10, 8, 7, Vista, XP, 2000 (32/64-bit)
Can also connect with Android and iOS (no virtual COM software)
Processor Broadcom BCM4390
ARM Cortex-M3 @48MHz, 32-bit CPU + WLAN CORE
Memory: 448KB RAM and 2MB flash
Network IEEE 802.11 b/g/n
Frequency 2.412 - 2.484 GHz
Protocols ARP, IP, ICMP, UDP, TCP, DHCP, Modbus TCP RTU (RS485)
Network mode Simple AP, Station, Dual (AP & Station) / Infrastructure, Ad-Hoc
Transmit power +17dBm @802.11b, +13dBm @802.11g, +11dBm @802.11n
Minimum receiver sensitivity -80dBm
Power consumption Max. 360mA peak at 3.3V
Baud rate 9600 to 921,600 bps
Data bits 8
Parity None, even, odd
Stop bits 1
Serial signals RS485: D+, D-
RS422: TX+, TX-, RX+, RX-
Parameter configuration Web browser over WiFi
Operating distance Up to 330 feet (100 meters)
Flow control Automatic Data Direction Control
Serial port Removable screw terminal header
Antenna External 2dBi di-pole, SMA Female
Power supply
Operating temp. 0C to +70C
External battery option Yes
Dimensions 80 x 40 x 18 mm
Certifications CE, FCC, ROHS

For alternative wireless serial solutions please see our full selection of wireless RS232 adapters.


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