Your automation, our passion.

+1.763.957.6000  |  HPD Support Login  |  Newsletter Signup

DeviceMaster ® UP 1-Port VDC Modbus

The DeviceMaster UP brings plant floor device visibility by enabling communication between factory floor serial and Modbus devices, and PLC controllers.

Part Number: 99501-2

PortVision DXweb

  • Serial to Modbus/TCP
  • Wide operating temperature ranges (-37° to 74°C)
  • Variable power input eliminates need for power converters
  • PortVision® DX monitoring and management software
  • RoHS 2 compliant under CE
  • DualConnectPlus™ Technology

The DeviceMaster UP 1-Port VDC Modbus supports the following communication modes:

  • Modbus TCP/RTU/ASCII to raw/ASCII Serial or raw/ASCII Ethernet
  • Modbus/TCP to Modbus RTU/ASCII
  • Modbus RTU/ASCII (Auto Locate and Auto Route)
  • Raw/ASCII Data Stream and Command/Response Modes
  • Remote Modbus TCP/RTU/ASCII

Comtrol has developed three unique Modbus firmware applications that provide a wide range of Modbus connectivity. Simple connections or complex Modbus networks, you can do it all with a DeviceMaster UP. The DeviceMaster UP is loaded with Modbus Router firmware.

The easy-to-use configuration and one of the three Modbus protocols makes upgrades for plant floor global visibility faster and more economical than ever before. The DeviceMaster UP enables managers to leverage legacy devices and boost ROI, while reducing PLC programming and maintenance costs with simplified PLC interfaces.

The DeviceMaster UP Industrial Ethernet gateway offers a solution that configures in minutes via the web and enables you to support the Modbus/TCP protocol for serial device to PLC connections. RS-232, RS-422 or RS-485 software-selectable serial connections are supported via secure DB9 connectors.

DualConnectPlus™ technology provides the ability to simultaneously connect both serial and Ethernet devices to PLCs and/or applications. String, RFID, and barcode data filtering eliminates redundant data while extracting the RFID and barcode parameters.

The DeviceMaster UP is a cost-effective and proven Industrial Ethernet connectivity solution and is backed by Comtrol with live technical support and over 25 years of experience in network enabling devices.


  • DeviceMaster UP 1-Port VDC Modbus
  • Power supply
  • Power Cord, Euro Power Cord
  • Loopback plug
  • DIN rail adapters (2)
  • Power terminal connector
  • DB25M-DB9F Adapter
  • Screws
  • Installation Quick Start
  • Serial Connectors (1) DB9 Male
  • Ethernet Ports (1) 10/100 BaseT
  • Processor ARM7 44Mhz
  • Memory
    • RAM 8MB
    • Flash 4MB
  • Mounting Options Panel/Rack
  • LED Indicators Status, Ethernet Link/Activity, Collision, 100MB Ethernet, RX/TX per Port
  • Housing Rugged Steel Construction
Electrical Specifications
  • Device Requirements 5 to 30 VDC
  • Device Consumption 2.5 Watts
  • External Power Supply (Included)
    • Input 90 to 260 VAC @ 47-63Hz
    • Output 500mA @ 24 VDC
  • Surge Protection 15KV
Environmental Specifications
  • Operating Temperature -37° to 74° C
  • Storage Temperature -40° to 85° C
  • Humidity (non-condensing)
    • System On 20% to 80%
    • System Off 8% to 80%
  • Altitude 0 to 10000 Feet
  • Heat Output 8.5 BTU/Hr
  • MTBF (Mean Time Between Failures) 46.2 Years

Serial Communications

  • Software Selectable RS-232/422/485
  • Baud Rate 50 bps to 230 Kbps
    • Data Bits 7 or 8
    • Parity odd, even, or none
    • Stop Bits 1 or 2
  • Communication Modes Modbus/TCP to Serial or Ethernet TCP/IP
    Modbus/TCP to Modbus/RTU
    Modbus/TCP to raw serial data
    Modbus/RTU Device (Auto Locate and Auto Route)
  • Network Protocols Telnet, HTTP, SNMP, DHCP, ARP, BOOTP, Ping


  • Easy setup
  • Software selectable serial port interface
  • PortVision remote management software
  • PLC based or webbased serial port configuration
  • Watchdog reset
Export Information
  • Packaged Shipping Weight 1.66lbs
    0.75 kg
  • Package Dimensions 15.25" x 3" x 9.25"
    387.4 x 76.2 x 235 mm
  • UPC Code 7-56727-99501-2
  • Country of Origin USA
  • ECCN 5A992
  • Schedule B Number 8471.80.1000

Regulatory Approval Marks

CE Mark, FCC Part 15 Subpart B Class A, CTick, CUL, ODVA Certified, PIC Certified, RoHS Certified

Regulatory Approvals
  • Emissions EN55022 & A1:2000 IEC 100032
    IEC 100033
  • Immunity EN55024
    IEC 100042
    IEC 100043
    IEC 100044
    IEC 100045
    IEC 100046
    IEC 100048
    IEC 1000411
  • Safety EN60950
    IEC 60950
    CSA C22.2 No. 50/UL60950
  • Other Regulatory Approvals European Standard: RoHS 2 Compliant under CE
Pinout Diagram
  • Ground must be tied to signal ground.Pinout Diagrams
Find a Distributor

» Industrial Distributors
» North American Distributors
» International Distributors

Pre-Sales Questions

Comtrol's Pre-sales Team
For sales questions or to locate a reseller near you.

+1-800-926-6876 (1-800-Go Rocket)
Fax: +1-763-957-6001
[email protected]

Comtrol's Industrial Automation Sales
For sales questions or to locate an industrial distributor near you.

+1-800-926-6876 (1-800-Go Rocket)
Fax: +1-763-957-6001
[email protected]

Product Support and Service Information
Sales Support

Call +1.763.957.6000, or e-mail [email protected]

Technical Support

For technical assistance, our U.S.-based technical support team is only a phone call away.

Call +1.763.957.6000, or visit our forum at


Comtrol offers a 30-Day satisfaction guarantee and a 5-year limited warranty on all DeviceMaster products! Extended Warranty Available.

Software & Drivers
» Comtrol FTP Site