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Catalog # 305581 - Model 8581 DB9 2 x 3 Matrix Switch

    DB9 2 x 3 Matrix SwitchDB9 2 x 3 Matrix Switch
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    • DB9 2 x 3 Matrix Switch
    • DB9 2 x 3 Matrix Switch
Base Price:
Catalog No: 305581
Model No: 8581
Product Type:Switches: Copper
Cable Type/Port Connector:DB9 Switch Ports
Channels per Switch Chassis:1
Manual Control/No Power Required:LineSelect® Manual Operation
Pins Switched:9
Local Control:Rotary Knob


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.

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Model 8581 2 x 3 Manual Matrix Switch, Desktop

  • Ideal for sharing peripherals or backup data line. Easily switches two inputs to three outputs!


  • (2) DB9 male input ports, labeled A, B.
  • (3) DB9 female output ports, labeled 1,2,3.
  • (1) RJ45 female switch status port, labeled MONITOR
  • FRONT PANEL CONTROL: (1) Three position rotary selector, labeled A, NORMAL, and B.  Custom labeling available.
  • POWER: No power required.  Manually operated.
  • DIMENSIONS: 8.0" W x 2.5" H x 8.0" D.
  • (20.3 x 6.35 x 20.3 cm)
  • WEIGHT: Approximately 1.5 lbs. (0.7 kg)

LineSelect® Model 8581 2 x 3 DB9 MATRIX Switch APPLICATION:

The drawing illustrates two sources connected to DB9 ports A and B. The two sources have access to three devices connected to the DB9 ports, 1, 2 and 3.  The backup channel is line 3 which is a shared resource between Source A and Source B. You can see the six combinations (A-1, B-2), (A-1, B-3), (A-2, B-1), (A-2, B-3) (A-3, B-2), (A-3, B-2) in the diagram below.

Application Diagram of Model 8581 2x3 DB9 Matrix Switch Network


  • Allows quick access to a shared backup channel or a shared peripheral for either one of two input devices labeled A and B.
  • Manual operation via front-panel rotary switch.
  • All 9 pins of the DB9 interface are switched.
  • High quality sealed switch with self-wiping low impedance contacts.
  • Transparent to data speed and format.
  • Eliminates the need to plug and unplug cables.
  • Rugged aluminum packaging provides EMI/RFI shielding.
  • No external power is required.
  • Monitor port supplies switch position info via contact closure.
  • Improves computer network efficiency by allowing sharing of backup data line or peripherals.
  • Custom switch position labeling and custom wiring optionally available.
  • Custom length DB9 cables available for your switch installation.
  • Lifetime guarantee against manufacturing defects.
  • Municipalities, schools, government: On GSA Schedule!

LineSelect® Model 8581 2 x 3 Manual Matrix Switch, Desktop

Ideal for sharing peripherals or backup data line. Easily switches two inputs to three outputs!

 The Model 8581 allows two devices labeled A and B to share a backup channel or a backup peripheral.  Its standard configuration is desktop.  This is considered to be a matrix switch that can be custom-modified to connect the two input ports A and B to the output ports 1, 2, and 3 in a variety of configurations.

There are six possible combinations between inputs and outputs.

They are: (A-1, B-2) (A-1, B-3) (A-2, B-1) (A-2 B-3) (A-3, B-1) (A-3, B-2).

The three selected as standard for this model are: (A-1, B-3) (A-1, B-2) (A-3, B-2).

Any three combinations are optionally available.

This high-quality network switch is available to city, state, and federal government purchasers at a discounted price and favorable payment and shipping terms via GSA Schedule GS-35F-0286V. Click here for GSA details.

Model 8581 is available to government purchasers on our GSA Schedule GS-35F-0286V. Call for discounted price and terms.

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.

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