PathWay® Model 4209 DB25 Automatic Fallback Switch with Telnet Remote
Overview
The PathWay® Model 4209 DB25 A/B Automatic Fallback Switch with Telnet Remote allows the user the capability of sharing a single DB25 interface device connected to the Common port among two other devices connected to the A and B ports. The Model 4209 is packaged in a slim desktop style enclosure.
The switch may be controlled manually via front panel pushbutton, or Remote Control. Remote access can be accomplished using an Ethernet 10/100Base-T connection and Telnet commands. The front panel LED display indicates the switch position, and power status.
The unit monitors data activity on port "B". If the unit is in the A position and data activity is present on port B, the unit automatically switches to the B position. The unit will then remain in the B position until signal is not present, in which the unit will switch back to the A position automatically.
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Automatic Fallback Mode or Manual Mode
FEATURES OF THE MODEL 4209 DB25 AUTOMATIC FALLBACK SWITCH:
- The switch ports are transparent to data.
- All (25) pins of the DB25 interface are switched via break-before-make electromechanical relays.
- Pins 4 and 19 of the B port are monitored for RTS being active.
- The unit maintains last set position on power loss and continues to pass data.
- Front panel pushbutton control.
- Automatic fallback mode and manual mode.
- Control of the switch position from a 10/100Base-T LAN Ethernet environment.
- Remote Control Telnet command interface that allows the user to control switch position, lockout front panel operations, toggle between automatic and manual modes, obtain switch status, as well as, query firmware version number, query serial number and enable/disable autosend of switch positions.
- Front panel LED's display the present position and power status.
- The unit automatically switches to the B position, when data is detected on port B.
- Unit chassis ground is connected to the signal ground.
- Attractive all metal black box packaging provides EMI/RFI shielding.
- Custom length DB25 cables available for your switch installation.
TECHNICAL SPECIFICATIONS:
- PORT CONNECTORS: (3) DB25 female connectors labeled A, B, and COMMON.
- FRONT PANEL CONTROL: (3) Manual pushbuttons; (1) Positional, (1) Manual Mode, and (1) Automatic Fallback Mode).
- DISPLAY: (4) LED's;(2) Positional Green LED's, (1) Blue LED (Auto Fallback Mode), (1) Blue LED (Manual Mode)
- REMOTE CONTROL: (1) RJ45 female connector on rear panel accepts 10/100 Base-T LAN Access Ethernet that uses TELNET commands for Remote Control operation.
- POWER: UL approved 100VAC/240VAC 50 Hz/60Hz wall mount power module supplies 12VDC, 500 mA to the unit.
- DIMENSIONS: Desktop configuration 8.11" W x 2.42" H x 7.30" D (20.6 x 6.2 x 18.6 cm)
- WEIGHT: Approximately 2.0 lbs. (0.9 kg)
PathWay® Model 4209 DB25 Automatic Fallback Switch with Telnet Remote:
The drawing illustrates a COMMON Device connected to the DB25 COMMON port with access to a Primary Line connected to Port A and a Secondary Line connected to Port B. The unit monitors Port B for data activity. The Remote RJ45 10/100Base-T LAN Ethernet port can be used to remotely control the unit via Telnet Commands and is IP Addressable!
- Activity on Port B = B position;
- No activity on Port B = A position
- Auto Sense to automatically change position based on presence or absence of signal on Port B.

Ordering Information
- Catalog Number: 304209
- Model Number: 4209
- Base Price: See website or contact us for current pricing and availability.
- Optional Wide-Range power supply: Catalog Number 517277 IEC C14 Inlet, 100-240VAC, 12 VDC
Documentation & Support
- Specification Sheet (PDF) Download Available.
- Product Manual available upon request.
- For custom fiber optic network switch requirements contact our sales support team 401-943-1164 or email eslab@electrostandards.com
- We welcome international inquiries and ship worldwide.
Shipping and Returns 
- Shipped via UPS ground (unless otherwise requested).
- Freight Charges prepaid and added to invoice. We can estimate freight charges for you.
- Return policy: contact us within 30 days of shipment for an RMA number. Items returned without RMA not accepted. Please refer to our full return policy in our Terms and Conditions found on our website.
Wide Range Power Option Available: (Cat No. 517277) CE, RoHS, and UL listed table mount power module, 100VAC/240VAC, 50/60Hz for use in place of the standard power module that is included with the unit. Has IEC 60320 C14 inlet. Ideal for international applications.
All data switch boxes, 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.