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305924 Model 9924 5-Channel DB9 A/B Switch, Simultaneous Switching

    5-Channel DB9 A/B Switch, Simultaneous Switching5-Channel DB9 A/B Switch, Simultaneous Switching5-Channel DB9 A/B Switch, Simultaneous Switching5-Channel DB9 A/B Switch, Simultaneous Switching
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    • 5-Channel DB9 A/B Switch, Simultaneous Switching
    • 5-Channel DB9 A/B Switch, Simultaneous Switching
    • 5-Channel DB9 A/B Switch, Simultaneous Switching
    • 5-Channel DB9 A/B Switch, Simultaneous Switching
Base Price:
Catalog No: 305924
Model No: 9924
Product Type:Switches: Copper
Cable Type/Port Connector:DB9 Switch Ports
Channels per Switch Chassis:5
Manual Control/No Power Required:LineSelect® Manual Operation
Channel Control:Simultaneous Channel Control
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 9924 Five-Channel DB9 A/B Switch, Manual, Simultaneous Switching, Rackmount

  • Switch Five Channels to an Alternate Path, Simultaneously!

  • Popular in TV station Switching Applications


  • PORT CONNECTORS: (3) DB9 female connectors labeled A, B, and COMMON for each of the 5 channels.
  • FRONT PANEL CONTROL: (1) Rotary Switch on front panel selects A or B position for all 5 channels.
  • POWER: No power required. Manually operated.
  • DIMENSIONS: Rackmount 19.0" W x 1.75" H x 8.66" D (48.3 x 4.4 x 22.0 cm)
  • WEIGHT: Approximately 4.4 lb. (2.0 kg)


The drawing illustrates five DB9 COMMON ports connected to a COMMON Device. Each Channel has a COMMON port with access to two other devices, " Device A" and " Device B". All five channels simultaneously switch from "A" position to "B" position and back from "B" position to "A" position.

LineSelect Model 9445 5-Channel DB9 A/B Switch Application


  • Each of five channels allows quick connection to any one of two devices from one COMMON device.
  • Simultaneously switches all five 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 RS232, RS422, RS485 or ANY application that has a DB9 connector interface.
  • The switch ports are transparent to all data.
  • 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.
  • Lifetime warranty against manufacturing defects.

 With each of its five channels, the Model 9924 DB9 A/B Switch allows the user to access two DB9 interface devices connected to its A and B ports with one DB9 interface device connected to its COMMON port.  The five channels are switched simultaneously via a knob located on the front panel. See the application diagram above.  The Model 9924 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.

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/

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 

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