$175.49 CAD

Black Box RS232 Passive Splitter - DB25, 3-Port

Use our Modem Splitter to connect three terminals to one modem and save money - you won't need extra modems and extra lines!

No special cables are needed. It uses ordinary straight-pinned cables for a hookup, and includes a 6-ft. DB25 male/DB25 female extension cable and a serial DB9 female/DB25 male AT adapter.

The Modem Splitter is transparent to speed and protocol and works equally well in sync and async environments.

The TL073A-R4 includes (1) modem splitter, (1) 6-ft. DB25 male/DB25 female extension cable, and (1) serial DB9 female/DB25 male AT adapter.

A 6-Port Modem Splitter is also available. See "Similar Products."


  • Only one SLAVE port may transmit data to the MASTER port at any one time, Pin 2 on the three SLAVE ports are not tied in common and are isolated from each other by an OR gate.

  • Data coming into the MASTER port on pin 3 of the RS232 DB25 Passive Splitter goes to all three Slave ports since they are all tied common.

  • The total combined length of all cables connected to the unit should be less than 50 feet (15.2 m).

  • Signals present on the PORT connectors at pins 2, 4, and 20 are passively stored and sent to the corresponding pins on the MASTER connector.

  • Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are sent to the corresponding pins on each of the PORT connectors.

  • MASTER port is configured DTE and PORTS 1-3 are configured DCE

Product Type: Signal Splitter
Environmentally Friendly: Yes
Taa Compliant: Yes
Country Of Origin: Taiwan
Brand Name: Black Box
Manufacturer: Black Box Corporation
Product Name: RS232 Passive Splitter - DB25, 3-Port
Manufacturer Part Number: TL073A-R4
Manufacturer Website Address: http://www.blackbox.com
Packaged Quantity: 1
Package Contents:
  • RS232 Passive Splitter - DB25, 3-Port
  • 1 x 6-ft. DB25 Male/DB25 female Extension Cable
  • 1 x Serial DB9 Female/DB25 male AT Adapter
Limited Warranty: 1 Year
Weight (Approximate): 900 g
Feature1: Only one SLAVE port may transmit data to the MASTER port at any one time, Pin 2 on the three SLAVE ports are not tied in common and are isolated from each other by an OR gate.
Feature2: Data coming into the MASTER port on pin 3 of the RS232 DB25 Passive Splitter goes to all three Slave ports since they are all tied common.
Feature3: The total combined length of all cables connected to the unit should be less than 50 feet (15.2 m).
Feature4: Signals present on the PORT connectors at pins 2, 4, and 20 are passively stored and sent to the corresponding pins on the MASTER connector.
Feature5: Signals present on the MASTER connector at pins 1, 3, 5, 6, 7, 8, 15, and 17 are sent to the corresponding pins on each of the PORT connectors.
Feature6: MASTER port is configured DTE and PORTS 1-3 are configured DCE