EKI-1221R - 1 Port RS-232/422/485 Modbus Gateway/Router

5 Year Warranty

These products come with a standard five year manufacturer warranty.

Wide Voltage

These devices and systems have been designed to accept a wide voltage DC power input. This feature is desirable in the industrial market where a fixed voltage level or mains AC power cannot be guaranteed.

DIN-rail mountable

These devices have been designed to be mounted directly on to an industry standard DIN-rail.


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.

FCC Approved

The Federal Communications Commission (FCC) is an independent agency of the United States government that sets standards and governs the testing of conducted and radiated emissions such as EMI.


Underwriters Laboratories (UL) is an independent product safety certification organisation based in the United States. UL develops standards for products, materials, components, assemblies, tool and equipment, mainly dealing with product safety.

ATEX approved

ATEX is the name commonly given to the European Directive 94/9/EC, also known as ATEX 95 or ATEX Equipment Directive. The regulation applies to all equipment intended for use in explosive atmospheres, whether electrical or mechanical, including protective systems. There are two categories of equipment 'I' for mining and 'II' for surface industries. The directive covers a large range of equipment, potentially including electrical equipment used on fixed offshore platforms, in petrochemical plants, mines, flour mills and other areas where a potentially explosive atmosphere may be present.

EKI-1221R Modbus Gateway Router
EKI 1221R
Free delivery to UK mainland addresses

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1 Port RS-232/422/485 Modbus Gateway/Router


D-Sub9 to Terminal Converter

All prices exclude VAT at current rate.
Minimum order value - £30 (exc. VAT and delivery).
Free delivery of the EKI-1221R 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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EKI-1221R overview

  • Integrates Modbus TCP and Modbus RTU/ASCII networks
  • Supports up to 921.6kbps and any baud rate setting
  • Supports up to 16 connections per serial port under 32 sessions under Modbus slave mode
  • Supports surge protection for DC power ports with line-to-line (2kV) and line-to-earth (4kV) for signal ports with 4kV
  • Software-selectable RS-232/422/485 communication
  • Built-in 15kV ESD protection for all serial signals
  • Provides high secure access tunnel with VPN
  • Supports up to 16 connections per serial port under 32 sessions under Modbus slave mode
The EKI-1221R Modbus router is a bi-directional gateway for integrating new and existing Modbus/RTU and Modbus/ASCII serial devices to newer TCP/IP networked-based devices. The EKI-1221R can remote control and monitor local Modbus devices for industrial IoT applications providing a high secure access tunnel with VPN to protect domestic data.

For more information about the EKI-1221R Modbus router please contact our technical sales team on +44 (0)1782 337 800 or atlernatively submit an enquiry.
Enquire about the EKI-1221R
Need more info or project pricing for the EKI-1221R?
T: +44 (0)1782 337 800 • E: sales@impulse-embedded.co.uk
COVID-19 UPDATEThrough strict hygiene and distancing practises, we are still fully operational. Feel free to get in touch for more info! contact us
+44(0)1782 337 800