PRODUCT RELEASE: DeviceMaster ® RTS 4-Port DB9 2E

DM UP-RTS 4P DB9 2E Product Announcements Blog Post




DeviceMaster ® RTS 4-Port DB9 2E

The DeviceMaster RTS 4P2E is the 4-port model of Comtrol’s popular line of industrially-focused DIN-rail mount serial device servers.  Packaged in a compact, rugged housing, the RTS 4P2E model provides four serial ports via standard DB9 male connectors with the additional benefit of a two-port Ethernet switch to support a variety of network installations.  Featuring the same Linux and Windows certified drivers, SSL/SSH security, and intuitive configuration as the rest of the industry-leading DeviceMaster family, the small-form factor RTS 4P2E is the perfect serial expansion solution for panel builders, cabinet installations or any application where performance demands are high but space is at a premium.


  • Wide DC input voltage range (5-30 volts)
  • Redundant power input for fail-safe powerDeviceMaster RTS 4-Port DB9 2E
  • RS-232/422/485 software selectable interfaces
  • DB9 male serial connectors
  • PortVision DX
  • Screw terminal power connector
  • Dual Ethernet ports for daisy-chaining devices
  • 25KV surge protection for serial ports
  • Features DIN rail mounting
  • Wide operating temperature range (-40º to 75º C)
  • NEMA TS2 certified
  • SSL & SSH management, SSL serial data stream encryption
  • Wide input power range
  • IPv6 support
  • Real-time email event notification


Product Overview

The DeviceMaster RTS 4-Port DB9 2E serial device server can be used to network-enable two serial devices on any Ethernet network and is ideal for applications in: traffic and transportation, power utility, industrial automation, material handling and any project that requires serial-to-Ethernet communication with DIN rail-based equipment installations.
For more information or to request an evaluation unit, contact or 763.957.6000

Mining Application Using IO-Link Master and PC

A North American mining systems integrator implemented a solution for a mining application company seeking a better way to identify particle size and increase awareness of jams on their mineral fragmentation conveyor line.

Mining Application

Mining Application Using IO-Link Master

Comtrol’s IO-Link Master 4-EIP, with the IO-Link laser distance sensor connected, helped them achieve both of these tasks. The main reasons they decided to use Comtrol’s IO-Link master were:

  • Comtrol’s master is able to work directly with a PC, no PLC required
  • Other IO-Link master solutions rely on a PLC to use and set up the master, which was not desired for this mining application
  • The ease of set-up, powerful web interface and Modbus TCP support were other determining factors.

The end-user was using a vision system for analyzing mineral fragmentation on a conveyor line. The mineral would be broken down and sent along the line where the vision system would ensure the particle size was correct.

However, problems exist with picking up accurate readings when the bed depth, or amount of mineral on the line, is great. Working with Comtrol’s IO-Link Master that is used to connect the IO-Link distance sensor has helped the company increase their accuracy with reading the bed depth. The laser distance sensor is also used to pick up the distance to the top layer of mineral going down the line which helps normalize the data along with the vision system. This improves accuracy in analyzing mineral particle sizes as the line moves along.

To continue reading the story, click here.

To learn more about Comtrol’s IO-Link Master, please contact

Access Control UL294/294B Regulations: Why Do They Matter?

Access Control UL294 is the standard of safety for Access Control System units that all access control systems must meet. UL294B is a newer standard, specifically for the use of Power over Ethernet (PoE) components used within access control systems where PoE is the primary power source.

Government and state regulations are moving toward required access control UL294 compliance. Comtrol’s RocketLinx ACS7106 is the first UL294B certified switch enabling confidence in deployment and integration within access control systems. 

The ACS7106 switch features four 10/100BASE-TX PoE Plus ports for providing power and data to remote PDs (Powered Devices) such as access card readers and IP surveillance cameras, and two 10/100/1000BASE-TX uplink ports that assure maximum throughput for high bandwidth applications.

The official site for the UL Standards states that:

SCOPE (Access Control UL294)

1.1 These requirements apply to the construction, performance, and operation of systems intended to regulate or control:

a)    Entry into a protected area or a restricted area or

b)    Access to or the use of a device(s) by electrical, electronic or mechanical means.


Meeting Your Network Needs: Unmanaged vs. Managed Switches Explained

The world is moving towards managed switches as complexity and demand increases. But what are the differences and how do you know which switch is going to be right for you?Unmanaged vs. Managed Switches Explained RocketLinx_group 3_left

Unmanaged Switches

An unmanaged switch reduces costs and simplifies the configuration process. On the other side, a managed switch is more intelligent, allows for new technology and application adjustments, as well as enabling better troubleshooting and most importantly increased security.

An unmanaged switch is less expensive at initial purchase. An unmanaged switch contains a fixed set of rules and will handle incoming data based on those rules. It’s important to note that the forwarding rules cannot be changed, which may increase downtime to discover and fix a problem. An unmanaged switch can simplify the configuration process or decrease the product cost in some of these areas; a less powerful processor, may contain less memory, fewer LEDs, fewer ports. Depending on your network needs those cost saving efforts can greatly benefit your company.

Managed Switches

The best feature of a managed switch is its configurability. When using a managed switch you are free to adjust the rules for your application at any time, this can be very useful in the Industrial Automation field and many others. The configurability can save costs and downtime when you are free to separate your networks.  The best way to benefit from this configurability would be to have an engineer in your company who understands the managed switch’s complexity. A managed switch offers other valuable resources such as; the support of VLANs, IGMP snooping, port mirroring, decreased downtime and increased security.

Comtrol offers a wide selection of industrial, enterprise, and hardened switches supporting 10/100/1000 Ethernet, fiber, and PoE applications.  The end decision of a managed switch or unmanaged switch will be determined by your unique network needs.

Tech Tip: DTE and DCE

DTE – Data Terminal Equipment

DTE, short for Data Terminal Equipment is a device that controls data flowing to or from a computer. The term is most often used in reference to serial communications defined by the RS-232C standard. This standard defines the two ends of the communications channel as being a DTE, and a DCE device.

DCE – Data Circuit-Terminating Equipment

In practical terms, the DCE, or Data Circuit-Terminating Equipment, is usually a modem and the data terminal equipment is the computer itself, or more precisely, the computer’s UART chip.

Comtrol serial ports are Data Terminal Equipment devices except for products which have been specifically designed to be switchable from Data Terminal Equipment to Data Circuit-Terminating Equipment.


When connecting a Data Terminal Equipment device to another Data Terminal Equipment device it is necessary to use a Null Modem cable.

When connecting a Data Terminal Equipment device to a Data Circuit-Terminating Equipment device it is necessary to use a Straight Thru cable.

Comtrol at ITS Heartland

Comtrol will be attending ITS Heartland on April 25 to the 27 in Des Moines, Iowa. Attendees will have an opportunity to network and share experiences across a wide variety of ITS disciplines.

Comtrol at ITS Heartland




Comtrol at ITS Heartland

The many different training and networking opportunities available through this event will provide participants with the tools necessary to effectively plan and deploy ITS technologies within their own jurisdictions. Register Today!

Contact Katya Lee at 763-957-6122 to learn more.

Save a Trip to Your Traffic Cabinet with the Ping Reset Feature

Ping Reset to reboot any IP device!

Ping Reset will allow you to reset any IP device in your traffic cabinet.
Ping Reset

Common IP Devices:
  • Loop Detectors
  • Radar systems
  • Traffic controllers
  • Any Ethernet switch
  • Dynamic message signs (DMS)
  • IP, PTZ, Analog cameras
  • Battery Back Ups
  • Malfunction Management Unit (MMU)
  • Any IP addressable device



The RocketLinx ES8510-XT is a managed industrial Ethernet switch, equipped with seven 10/100TX ports and three 10/100/100 RJ45/100-FX/Gigabit SX/LX/LHX/ZX/SFP combo ports.  Two Gigabit ports may be used to form a non-stop Redundant Ring while the third Gigabit port enables connection to an upper switch, couple ring, or public server.  The Gigabit combo port design provides flexibility to choose copper or fiber media supporting 100BASE-FX or 1000BASE-X, Multi-Mode or Single-Mode for a wide variety of distance and installation requirements.

For more information, contact Katya Lee at 763.957.6122

IO-Link 101: 10 Terms to Know

IO-Link 101: 10 Terms to Know

Here are 10 terms to know to help understand IO-Link 101.

1. IO-Link System

An IO-Link system is comprised of sensors and/or actuators that support IO-Link (version 1.0 or 1.1) which are connected via a master, such as Comtrol offers. The master then will communicate to a controller (PLC, HMI, SCADA, etc.) through an industrial Ethernet protocol such as Ethernet/IP, Profinet IO or Modbus TCP.IO-Link 101

Full Explanation

2. MultiLink – Comtrol Specific Benefit

MultiLink provides the capability to simultaneously access multiple IO-Link controllers running different industrial Ethernet protocols.

Full Explanation

3. IODD: IO Device Description

Every IO-Link sensor/actuator has an IODD file which allows you to interact with the device on a web interface such as Comtrol’s. Each IO-Link device manufacturer will have these available via their website. With Comtrol’s IO-Link Master you can load and store a library (up to 15790K) of IODD files for your IO-Link devices onto the Comtrol IO-Link Master so that you can configure the IO-Link sensors or actuators from the IO-Link Master web interface.

Full Explanation

4. Data Types: Process, Service, Event

Three types of data are visible with IO-Link: Process Data, Service Data and Event Data.

Full Explanation

5. Remote Parameterization

The Comtrol IO-Link Master supports remote communication from a PLC and/or HMI to an IO-Link device so that you can change an IO-Link device’s configuration or operational behavior. In addition, you can change an IO-Link device’s configuration using the Comtrol IO-Link Master web interface without a PLC or HMI.

Full Explanation

6. Auto-Device Replacement (ADR)

Allows an IO-Link device to be automatically configured using previously stored values. Quick and easy replacement of failed or damaged sensors or actuators which means reduction in production line downtime and maintenance costs.

Full Explanation

7. IO-Link Master web interface

Comtrol offers a web interface unlike any other in the IO-Link Master marketplace. It provides extensive benefits to make using an IO-Link Master as easy as possible.

  • Configure IO-Link, EtherNet/IP and Modbus TCP settings for your IO-Link device
  • View real-time diagnostics for IO-Link, EtherNet/IP, and Modbus TCP activity on your IO-Link Ports
  • Load IODD files onto the IO-Link Master for your convenience
  • Configure IO-Link devices in minutes using the IO-Link Device – Port table (GUI) or the IO-Link Device ISDU Interface, which provides ISDU handling
  • Data Storage (automatic or manual) for Auto Device Configuration
  • IO-Link Device Validation (compatible and identical) to link specific IO-Link devices to a specific port
  • Data Validation (strict or loose) for data integrity

Full Explanation

8. IO-Link Device Validation

Using IO-Link Device Validation makes your IO-Link master ports intelligent. You can link IO-Link ports to operate only when a compatible or identical IO-Link device is attached.

Full Explanation

9. ISDU: Index Service Data Unit

Comtrol offers ISDU Handling which is when the IO-Link Master handles all programming to provide PLC access to IO-Link device ISDU blocks with a flexible and simplified interface – provides multiple or single ISDU command message support and blocking and non-blocking messaging methods. The PLC ISDU message format is designed for flexibility and ease of use. Each message can contain a single command, multiple commands with the same data area size, or with commands with varying data area sizes.

IO-Link 101

Full Explanation

10. Data Validation (Strict or Loose)

Use the Data Validation option to ensure data integrity by defining the PDI and/or PDO length. Also gives the user the ability to see that data is successfully being communicated to the master.

Full Explanation

This blog post offers IO-Link 101 information to help educate about everything IO-Link 101.

Join Comtrol at ISC West

Comtrol at ISC West

Comtrol will be attending ISC West in Las Vegas on April 6-8. At ISC West you will have the chance to meet with technical reps from 1,000 exhibitors and brands in the security industry and network with over 28,000 security professionals.


Find out about new and future products and stay ahead of the competition. Encompassing everything from access control to Facial Recognition software you’re sure to find products and services that will benefit your company and clients. This year don’t miss our new IT Pavilion featuring the latest cyber security solutions.

Register Today!

Questions? Please contact Tom Baker at or 763-957-6158


Get every new post delivered to your Inbox

Join other followers: