MAQ20-COM4 - Communication Module; Ethernet, USB, RS-485

Extended Wide Temperature

These products utilise high quality industrial grade components enabling them to work in extended wide temperature environments. They are capable of running below -20C and above +70C and offer further protection than standard wide temperature rated products.


This product fully adheres to the Restriction of Hazardous Substances Directive 2002/95/EC, RoHS for short.  The directive covers the restriction of use of certain hazardous substances in electrical and electronic equipment and was adopted in February 2003 by the European Union.


CE is a mandatory standard for products on the market in the European Economic Area. By CE marking a product, the manufacturer ensures that the item meets the essential safety requirements set out in the applicable CE directive.

MAQ20-COM4 Communication Module
Free delivery to UK mainland addressesFeatured in:Dataforth MAQ20

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Communication Module; Ethernet, USB, RS-485

All prices exclude VAT at current rate.
Minimum order value - £30 (exc. VAT and delivery).
Free delivery of the MAQ20-COM4 to UK Mainland on orders over £150 (exc. VAT and delivery) when purchasing online - excludes Northern Ireland, Isle of Man, Isle of Wight, Scottish Islands and the Channel Islands.

* Lead time is indicative and is subject to change at time of ordering. Next business day delivery on in-stock products only (when ordered before 3pm).
** Contact us for quantity or project pricing.
† Additional delivery charge may be incurred for certain postcodes (calculated at checkout)
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MAQ20-COM4 overview

  • Supports 10/100Base-T RJ45 Ethernet
  • Supports USB2.0 Type B
  • Supports RJ12 4-wire RS-485 up to 921kbps
  • 7~34V DC @ 2A input power
  • 5V DC @ 3A power to bus
  • 50V isolation to bus
  • Host software interfaces to the system using Modbus TCP or RTU protocols
  • -40C to +85C extended operating temperature
The MAQ20-COM4 communication module supports Ethernet, USB and RS-485 industrial buses with the host software interfacing to the system using the Modbus TCP or RTU protocol.

When using the Ethernet interface, up to four simultaneous socket connections are supported and each socket can process up to four simultaneous Modbus TCP transactions.  Serial communications over RS-485 can be run at baud rates as fast as 921.6kbps.

Another useful feature of the system is the capability to store acquired data locally for later analysis.  Each module has an easily accessible and removable 4GB micro-SD memory card that can be used to log data from all input modules.

To power the system, a 7-34V DC power source is connected to the communication module. Regulated and protected supplies within the module then provide power both to the internal circuits and to all modules in the system.
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+44(0)1782 337 800
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Phil T.
Great service with very quick deliveries superb
Nov 2021
+44(0)1782 337 800