401-943-1164 / US & Canada Toll Free: 877-943-1164

305914 Model 9449 3-Channel DB9 A/B Switch

    3-Channel DB9 A/B Switch3-Channel DB9 A/B Switch3-Channel DB9 A/B Switch3-Channel DB9 A/B Switch
Click image to enlarge
    • 3-Channel DB9 A/B Switch
    • 3-Channel DB9 A/B Switch
    • 3-Channel DB9 A/B Switch
    • 3-Channel DB9 A/B Switch
Base Price:
Catalog No: 305914
Model No: 9449
Product Type:Switches: Copper
Cable Type/Port Connector:DB9 Switch Ports
Channels per Switch Chassis:3
Manual Control/No Power Required:LineSelect® Manual Operation
Channel Control:Simultaneous Channel Control
Pins Switched:9
Local Control:Rotary Knob

DB9 Manual Network Switch, Rotary Switch, RS422


Shipping Terms

Shipments are made via UPS Ground, unless otherwise specified. Freight charges are prepaid and added to your invoice. We can estimate the freight costs for you.

We can ship freight collect on your account, just provide your UPS Account Number.

We can also ship via the carrier of your choice. Provide the details and your account number.

Products shall be shipped F.O.B. Electro Standards' facility. Title to and risk of loss or damage to the products shall pass to you upon Electro Standards delivery of the products to a carrier for shipment. Title to software will remain with the applicable licensor. Electro Standards' prices do not include shipping and handling charges. Electro Standards reserves the right to use its own discretion in the manner and routing of shipments. Electro Standards shall be permitted to deliver products in separate lots.

Shipping Return Policy

  • To return an item, contact Electro Standards at 401-943-1164 to obtain a Return Material Authorization (RMA) number. RMA numbers are valid for 30 days after the date of the shipment and cannot be extended or re-issued. We are unable to accept returns without an RMA number.
  • All returns except those of defective product are subject to a 15% restocking fee, and additional charges for handling or freight are refunded only in cases of defective products.
  • Return freight must be shipped prepaid. We recommend that you insure the package as you are responsible for risk of loss on all returned packages. We recommend that all cartons are properly packed as Electro Standards is not responsible for product damaged en route. We do not issue call tags for product returns.
  • Returned product must be clean, undamaged, and complete with all manuals, accessories, documents and packaging. The items must be in a resalable condition.
  • The product must have with it a copy of the original invoice or packing slip and the appropriate RMA paperwork.
  • If your item is not working properly, please contact Electro Standards at 401-943-1164 for help in trouble-shooting your application.
  • If the product is defective, Electro Standards will repair or replace that item (at our discretion) upon receipt and evaluation of the original product.
  • Electro Standards reserves the right to authorize product returns after 30 days from the invoice date in some cases. If the product is accepted after 30 days, credit will be issued toward future pruchases only and some additional restocking charges may be applied.
  • All credits from RMAs must be used within one calendar year of issue.

Ask a Question

Protected Document Request



LineSelect® Model 9449 Tri-Channel DB9 A/B RS422 Switch, Simultaneous Control, Rackmount,


  • PORT CONNECTORS: (3) DB9 female connectors labeled A, B, and COMMON, for each of the 3 channels.
  • FRONT PANEL CONTROL: (1) Rotary switch on front panel selects A or B position for all 3 channels.
  • POWER: No power required. Manually operated.
  • DIMENSIONS: Rackmount configuration, 19.0" W x 1.75" H x 8.8" D. (48.3 x 4.4 x 22.4 cm)
  • WEIGHT: Approximately 4.3 lbs. (2.0 kg)

LineSelect®Model 9449 Tri-Channel DB9 A/B Application
DB9 RS422 NETWORK APPLICATION: Ideal for RS422 applications that have a DB9 connector interface.

The drawing shows one COMMON device connected to the Model 9449 three DB9 COMMON ports, for Channel 1, Channel 2 and Channel 3. Each channel is connected to two devices via ports 1 and 2.  The three channels are switched simultaneously.

LineSelect Model 9449 Tri-Channel DB9 RS422 A/B Switch Application


  • Each of three channels allows quick connection to any one of two devices from one COMMON device.
  • Simultaneously switches all three channels via front-panel rotary switch.
  • High quality sealed switch with self-wiping low impedance contacts.
  • All 9 pins of the DB9 interface are switched via break-before-make rotary switch.
  • Ideal for RS422 applications that have a DB9 connector interface.
  • Transparent to data speed and format.
  • Improves computer network efficiency by allowing sharing of peripherals.
  • Eliminates the need to plug and unplug cables.
  • Attractive all metal black box packaging provides EMI/RFI shielding.
  • Rackmount configuration is standard, height 1U (1.75")
  • Lifetime warranty against manufacturing defects.

With each of its three channels, the LineSelect® Model 9449 DB9 RS422 A/B Switch allows the user to access two DB9 devices connected to its A and B ports with one DB9 Device connected to its COMMON port. The three channels are switched simultaneously via a knob located on the front panel. See the application diagram above. The LineSelect® Model 9449 is enclosed in a 1U, full rack size, all metal black chassis designed to provide EMI/RFI shielding and fit in a standard 19" rack.

Don't forget to order your DB9 Cables! 

Custom Length DB9 cables available for your switch installation. 
State cable length (in Feet) when ordering.
Part Number  Description
990127 DB9 F/F, 9-Conductor Unshielded PVC Cable
990125 DB9 M/F, 9-Conductor Unshielded PVC Cable
990126 DB9 M/M, 9-Conductor Unshielded PVC Cable 

Electro Standards can supply all your Network Cable requirements. Click here to reach our CABLES, COPPER NETWORK Webpage.

For custom network switches call our friendly customer support staff at 401-943-1164, email eslab@electrostandards.com, or complete our online form: /Products-Custom/Copper-Switch/

All data switches, data communication products, and data acquisition products are subject to a one year warranty against manufacturing defects.  The limit of ESL liability is limited to the cost of the ESL product provided.

*Prices online are subject to change and verification.

All ESL products are available for export.

Electro Standards welcomes International inquiries: commutateur d'ordinateur,  equipo interruptor, interruttore del calcolatore, interruptor do computador, dator switch.

Available Combo Deals