DeviceMaster ® RTS 4-Port DB9

This industrial grade DeviceMaster RTS 4-Port DB9 Ethernet device server is designed for network-enabling serial communications devices, and delivers proven DeviceMaster performance

Part Number: 99445-9

PortVision DXweb

  • No serial cable distance limitations
  • RS-232/422/485 software selectable interfaces
  • Application compatibility via Windows and Linux certified drivers
  • Web-based configuration
  • Dual Ethernet ports for daisy-chaining devices
  • PortVision DX
  • Enables DIN rail or panel mounting
  • Wide operating temperature (-37° to 74°C)
  • SSL & SSH management, SSL serial data stream encryption
  • Wide input power range
  • IPv6 support
  • Real-time email event notification

Download VISIO Stencils


The Comtrol DeviceMaster RTS 4-Port DB9 is a four-port device server designed for network-enabling serial communications devices. When used with the included NS-Link™ driver software and a host PC, the DeviceMaster RTS enables placement of COM or TTY ports anywhere on an Ethernet network or across the Internet. In applications where connecting legacy serial devices to a PC without software changes is a requirement, a pair of DeviceMaster RTS units can be used to create a point-to-point serial tunnel across the network that seamlessly transfers serial data via TCP or UDP socket connections.

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  • DeviceMaster RTS 4 Port DB9 Device
  • Power Supply
  • US Power Cord
  • Euro Power Cord
  • Loopback Plug
  • Rubber Bumpers, Mounting Brackets, & Screws
  • Bus Interface Specification 10/100 BASE-T
  • Memory
    • SDRAM 8 MB
    • Flash 4 MB
  • Enclosure Black Finished Steel
  • Installation Method Panel Mountable
  • Dimensions 10.8" x 1.5" x 6.3"
    27.43 x 3.81 x 16
  • Product Weight 4.47 lbs
    2.03 kg
Electrical Specifications
  • Device
    • DC Input Voltage 9-30 VDC
    • Current Consumption +24VDC 200 mA
    • Power Consumption (maximum) 4.8 W
  • Comtrol External Power Supply
    • Output Voltage 9-30VDC
    • Output Current +24VDC 500 mA
    • Line Frequency 47-63 Hz
    • Line Voltage 90-260 VAC
  • ESD Surge Protection Provides minimum of 15KV protection for all serial lines. All Ethernet components are rated to 1.5KV magnetic surge protection.
Environmental Specifications
  • Air temperature
    • System On -37 to 74° C
    • System Off -40 to 85° C
  • Operating Humidity (non-condensing) 5% to 95%
  • Altitude 0 to 10,000 Feet
    3,048 m
  • Heat Output 16.4 BTU/Hr
  • MTBF (Mean Time Between Failures) 25.0 Years

Serial Communications

  • Connector Type DB9M
  • Number of Ports 4
  • Software Selectable Interfaces RS-232
  • Baud Rate 300 bps to 230.4 kbps
    • Receive Buffer 1024bytes
    • Transmit Buffer 256bytes
  • Device Driver Data Control
    • Data Bits 7 or 8
    • Parity odd, even, or none
    • Stop Bits 1 or 2
    • Flow Control Hardware, Software, or None
Ethernet Specifications
  • Network Protocols ARP, BOOTP, DHCP, HTTP, ICMP, Ping, RARP, RFC 1006 (ISO over TCP), RFC 2217, SNMP (MIB-II), TCP/IP & UDP socket services, Telnet, TFTP, and supports IP multicast data transmission
  • Connector Type RJ45F
  • Number of Ports 2


  • SNMP Support Monitoring only.
  • Other Event notification and Watchdog
  • Manufacturer's Warranty 5 Years
Export Information
  • Packaged Shipping Weight 7.08lbs
    3.21 kg
  • Package Dimensions 14.9" x 4" x 10.9"
    378.5 x 101.6 x 276.9 mm
  • UPC Code 7-56727-99445-9
  • Country of Origin USA
  • ECCN 5A992
  • Schedule B Number 8471.80.1000

Device Drivers

Regulatory Approvals
  • Emissions Canadian EMC requirements
    European Standard EN55022 FCC Part 15 Subpart B Class A limit
  • Immunity European Standard EN55024
    IEC 1000-4-2/EN61000-4-2: ESD
    IEC 1000-4-3/EN61000-4-3: RF
    IEC 1000-4-4/EN61000-4-4: Fast Transient
    IEC 1000-4-5/EN61000-4-5: Surge
    IEC 1000-4-6/EN61000-4-6: Conducted Disturbance
    IEC 1000-4-8/EN61000-4-8: Magnetic Field
    IEC 1000-4-11/EN61000-4-11: Dips and Voltage Variations
  • Safety IEC 60950/EN60950
    CSA C22.2 No. 60950/UL60950 Third Edition
  • Other Regulatory Approvals

  • Pinout Diagram

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

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

DocumentDescriptionDownload File
DeviceMaster ® RTS 4-Port DB9 User GuideContains detailed installation procedures and configuration information.
Product Support and Service Information

Part Number 99445-9

Sales Support

Call +1.763.957.6000, or e-mail

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 .


Comtrol offers a 30-Day satisfaction guarantee and a 5-year limited warranty on all DeviceMaster RTS family products!

View Warranty

Extended Warranty Available

Software & Drivers
» Comtrol FTP Site