What Is a Protocol Converter and How to Choose One

Protocol Converter

What is a protocol converter?

A protocol converter is a program or device, which converts from one protocol to another so as to permit systems or devices to achieve interoperability.

The protocols are software installed on routers which then transfer commands from one device to another. This involves the conversion of commands, data, their encoding, representation  and framing to achieve the transformation.

There is a range of protocols used in various fields which include: remote monitoring applications, oil, and gas, power generation, transmission and distribution, utilities, automation, AMR, Major protocol translation messages entail commands, conversion of data messages, events and time synchronization.

A protocol converter utilizes an internal master protocol to communicate to the external devices. The collected data is used to update the converter’s internal database. There are different ways of handling the spontaneous reporting of commands and events. Different physical medium for communication on protocol-X & Y is used. These include Ethernet, RS-485, RS-232 among others.

Types of protocol converters

There are essentially two types of protocol converters which are Software Protocol Converters and Hardware Protocol Converters.

How to choose a protocol converter

Allan Drek, networking manager at  Equustek Solutions Inc. insists that, when selecting a protocol converter, it is important to choose a protocol converter that best suits your application and communication setup. There are three main features to consider which include:

A number of connections: Protocol converters have different connections. Some have single connections, whereas others have as many as 32 connections with multiple serial ports.

Connectivity protocol: The chosen converter must support the protocol used by your network wither RS-485, RS-422, RS-232 or TTL serial.

Baud Rate: High baud rates perform better. Some converters have baud rates that are as high as 921 kbaud. Converters with lower baud rates have a slower performance but are less expensive.


Protocol Converter applications differ from industry to industry. Daniel Stephen, Software Engineer at datahighwaygateways.com, states that, depending on the protocols, it can be a hardware converter, software converter or an integrated converter. A few of the key applications are substation automation, industrial automation, process automation, automatic meter reading, vehicle automation applications and building automation.

The Protocol Converter is best suited in cases where data from the monitored equipment is unable to coexist with the protocols used by the building management system or network management system.

The protocol converter accepts up to a maximum of 1,024 inputs over 32 modules. This allows for flexible integration with multiple management and alarm systems using one device. Protocol converters are used with switches, CWDM and DWDM equipment, PCIe network cards, PDH multiplexers and fiber media converters.

Some of the industrial automation protocols are the RS232 converter, RS422 converter,  CAN (Controller Area Network), DF-1, EtherNet/IP, DeviceNet, ControlNet, Profibus, HostLink Protocol, Honeywell SDS, Modbus, HART Protocol and some Industrial control system protocols like OPC, OPC UA, and MTConnect.

Protocol converter series implement the actual transformation linking single E1 protocol port and protocol ports of RS232, V.24, V.35 or Ethernet in the tranny system. It is used to access problems concerning providers as well as commercial clients such as ATM, DDN and for that transformation in between the router and E1 port. Protocol converters offer local, commanded remote device loopback and remote loopback functions.

Types of Conversions

Simple conversions: These conversions do not change the overall framing. The most commonly used and simplest conversion is protocol conversion between Modbus TCP and Modbus RTU. In simple conversions, the Serial Modbus RTU frame is encapsulated in a TCP/UDP socket and sent over Ethernet. Due to similar protocol framings, both application layers interpret the data similarly provided that the communication interfaces be made transparent.

Complex conversions: These types of conversions require the conversion engine to make modifications in framing, mapping information for each type of command and data and even the object models. User configurations might also be required to define the mapping of both supported and unsupported data types. Complex conversions have advantages such as a finite processing time.