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Catalog # 309256 - Model 9256 2-Channel DB25 A/B Switch, RS530

    2-Channel RS530 DB25 A/B Switch2-Channel RS530 DB25 A/B Switch2-Channel RS530 DB25 A/B Switch2-Channel RS530 DB25 A/B Switch
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    • 2-Channel RS530 DB25 A/B Switch
    • 2-Channel RS530 DB25 A/B Switch
    • 2-Channel RS530 DB25 A/B Switch
    • 2-Channel RS530 DB25 A/B Switch
Base Price:
Catalog No: 309256
Model No: 9256
Product Type:Switches: Copper
Cable Type/Port Connector:DB25 Switch Ports
Channels per Switch Chassis:2
Manual Control/No Power Required:LineSelect® Manual Operation
Channel Control:Independent Channel Control
Pins Switched:25
Local Control:Rotary Knob
Feature:Supports the complete RS530 interface

Model 9256:

  • Dual Channel A/B Switch

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.

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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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DB25 Manual Network Switches, RS530, Rotary Switches
Model 9256 Dual Channel RS530 DB25 A/B Switch

  • Also applicable to RS232 Serial Data Interface, DB25 Parallel Printer Interface, and ANY DB25 Connector Interface (All 25 pins are switched).


  • PORT CONNECTORS: (3) DB25 female connectors for each of two channels labeled "A", "B", and "COMMON".
  • FRONT PANEL CONTROL: (2) Rotary Switches on front panel, one knob per channel to switch each channel independently.
  • POWER: No power required. Manually operated.
  • MTBF: 157, 945 HRS.
  • DIMENSIONS: Rackmount 19.0" W x 1.75" H x 8.7" D. (48.3 x 4.4 x 22.1 cm)
  • WEIGHT: Approximately, 4.3 lb. (2.0 kg)


The drawing illustrates two channels of independent switching via local controls. A COMMON device is connected to the DB25 COMMON port for each of two channels (Channel 1 and Channel 2). Both COMMON Devices, (COMMON Device 1 and COMMON Device 2), each has access to two other devices connected to the DB25 A and B ports of the Model 9256 unit.

LineSelect® Model 9256 Dual Channel RS530 DB25 A/B application


  • Each of two channels allows quick connection to any one of two devices from one COMMON device.
  • Independently switches each of two channels via two front-panel rotary switches.
  • High quality sealed switch with self-wiping low impedance contacts.
  • All 25 pins of the DB25 interface are switched via break-before-make rotary switch.
  • Supports the complete RS530 or ANY DB25 interface device.
  • Transparent to data speed and format.
  • Eliminates the need to plug and unplug cables.
  • Attractive all metal, black box packaging provides EMI/RFI shielding.
  • Chassis extrusions (front, rear, sides, and ears) are 6063T6 Aluminum, black anodized.  The top and bottom covers are vinyl clad cold-rolled steel.
  • Rackmount configuration is standard.
  • Lifetime warranty against manufacturing defects.
  • For an example of similar switch with custom labeling, see Model 9257, Cat No 309257.

The LineSelect® Model 9256 Dual Channel RS530 DB25 A/B Switch allows the user to access two DB25 interface devices connected to its A and B ports with one DB25 interface device connected to its COMMON port, for each channel.  Independent switching of each of the two channels is accomplished via the two knobs located on the front panel. The Model 9256 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.

Ask about our popular Model 900 EIA/TIA RS-530 Interface Analyzer

  • Red and Green light emitting diodes indicate status of key signals at the EIA/TIA data interface.
  • Easy to use, for fault isolation.
  • Electro Standards can supply all your Network Cable requirements.

Model 900 EIA/TIA RS520 Interface Analyzer

 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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