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* Contention/Broadcast * Model 4444 DB9 A/OFFLINE/B Switch, Catalog# 304444

    Contention Broadcast DB9 A/OFFLINE/B SwitchContention Broadcast DB9 A/OFFLINE/B SwitchContention Broadcast DB9 A/OFFLINE/B SwitchContention Broadcast DB9 A/OFFLINE/B Switch
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    • Contention Broadcast DB9 A/OFFLINE/B Switch
    • Contention Broadcast DB9 A/OFFLINE/B Switch
    • Contention Broadcast DB9 A/OFFLINE/B Switch
    • Contention Broadcast DB9 A/OFFLINE/B Switch
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Catalog No: 304444
Model No: 4444
Product Type:Switches: Copper
Positions:3, Offline
Cable Type/Port Connector:DB9 Switch Ports
Channels per Switch Chassis:2
Electronic Switches/Power Required:PathWay® Copper
Channel Control:Automatic
Security:Offline Position
Feature:Special Functions for Broadcast/Contention

DB9 switch with A, Offline, and B positions and special data activity monitoring functions for broadcast / contention switching of channels.

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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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Model 4444 Special Function Contention/Broadcast DB9 A/OFFLINE/B Switch


  • PORT & CHANNEL CONNECTORS: (2) DB9 Male connectors labeled A, and B. (1) DB9 Female connector labeled COMMON.
  • DISPLAY: (3) Red LED’s labeled A, B, and POWER indicate switch position and power status. LED A or B is illuminated when data signal was detected on that port and the port has now been connected to the COM port.
  • POWER: UL approved 100VAC-240VAC, 50Hz-60Hz wall mount power module supplies 12VDC, 500mA to the unit.  Has 2-prong, US, non-polarized plug.
  • DIMENSIONS: Desktop, 8.11” W x 7.28” D x 2.39” H. (20.3 x 20.3 x 6.4 cm)
  • WEIGHT: Approximately 1.7 lbs. (0.8 kg)

PathWay® Model 4444 Special Function Contention/Broadcast DB9 A/OFFLINE/B Application:

The Model 4444 DB9 A/OFFLINE/B Switch application drawing illustrates two DB9 Male connectors for ports A and B. The COMMON port connector is a DB9 female. Channel A and Channel B are each connected to a Contention Device A or Device B, respectively. The COMMON port is connected to a Broadcast Printer. Ports A and B are monitored for Data Activity. When Printer data activity has ended the unit switches to OFFLINE position and resumes monitoring ports A and B.    

Pathway Model 4444 Special Function Contention/Broadcast DB9 A/OFFLINE/B Switch Application


  • Pins 2 and 5 are connected among A, B and COM at all times.
  • Pin 3 on Port A and Port B are monitored for activity.
  • The unit automatically switches to the position, where data is detected.
  • Pin 3 of the DB9 interface is switched via break-before-make electromechanical relays.
  • The switch ports are transparent to all data.
  • No Front panel Control.
  • Front panel LED’s display the present position and power status.
  • Pin 2 of the COM Port is monitored for the Broadcast Printer data activity.
  • When Printer data activity is ended, the unit switches to the OFFLINE position and resumes monitoring Ports A and B for data activity.
  • Unit chassis ground is connected to the signal ground.
  • If power to the Model 4444 is lost, the switch will maintain its present position and continue to pass data.
  • Upon power restore, the unit will return to the OFFLINE position and resume monitoring ports A and B for activity.

The PathWay® Model 4444 Special Function Broadcast/Contention DB9 A/OFFLINE/B Switch allows the user the capability of sharing a single DB9 interface device connected to the COMMON port among two other devices connected to the “A” and “B” ports.  The Model 4444 is packaged in a slim desktop style enclosure.         

The front panel LED display indicates the switch position, and power status.

The unit monitors data activity on ports A and B pin 3.  If the unit detects data activity, the unit automatically switches to the port data was first detected on. The unit will then remain in the selected position, no longer monitoring data on A/B pin 3 and instead monitoring data over COMMON pin 2. Once that signal is not present for the time prescribed by the DSW1 settings, the unit will switch back to the idle disconnected OFFLINE position automatically.


(Cat No 517277) CE, RoHS, and UL listed table mount power module, 100 VAC-240 VAC, 50Hz-60Hz for use in place of standard power module that is included with the unit. Has IEC 60320 C14 inlet.  Ideal for international applications.

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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.

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

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