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A-B Switch

2-Ports with Dry Contacts
For RS-232

Supports RS-232
** UL 60950 & UL 62368 Approved


Features / Benefits

  • Economical Secure A/B Switch, No Volatile Memory Parts Utilized
  • Allows Remote A/B Switching
  • Supports Common Input and Port A or Port B Switching
  • Dry Contact Relay Switching
  • Three DB-9 Connectors – Compact Design
  • Supports 4-Wires and Ground for RS-232
  • All wires & Power are Surge Protected
  • Loss of Power Default Switch to Port A
  • Status LED’s Port A or Port B Active
  • Reliable 5V DC Power Supply is UL, cUL and PSE Approved, RoHS
  • Compact Sturdy Aluminum Enclosure


The A/B Switch allows secure and safe switching between RS-232 or any ITU V.24 data ports. The unit supports switching 4-wires of user data traffic from the common port to Ports A or Port B. All switching is accomplished with dry contact positive latching relays for years of dependable service. In the event of local power failure, the A/B Switch will default to Port A.

The switching between Port A to Port B are accomplished with a remote device that applies a positive or negative voltage to the A/B Switch via the RS-232 RJ45 port.

The front panel has three status LED’s that present the user with Port A or Port B active status. A power LED is also present to indicate that the A/B Switch has power applied.

The A/B Switch is housed in a sturdy metal enclosure and operates on a simple reliable 5V DC power supply.

The A/B Switch has a 3-year warranty and a 24-hour turnaround on warranty repairs..


Application Allows a user to connect to a Single Common Input Port and Remotely Switch between two Output A and B Ports with local visual port indicators.
Capacity Three Ports Common Port A and Port B
Data Interface 4-Wire & Ground Interface supports RS-232 or any ITU V.24 compliant balanced interface
Data Format Data Transparent at all Data Rates
Data Rates Up to 19.2Kbps
Indicators Power, Port A and Port B
Surge Protection Main power supply and all Data Ports
Power Source - MTBF External Wall Mount AC to DC Supply, Input Voltage 90-240VAC. Output Voltage is 5VDC with 300,000 Hour MTBF

EMI Approvals

FCC 47CFR, Part 15, Subpart B for conducted emissions from a Class A
FCC 47CFR, Part 15, Subpart B for radiated emissions from a Class A

Safety Approvals

UL 60950, UL 62368

Electric Discharge

IIEC EN-61000-4-2


Operating Temperature: 32º to 104º F (0º to 40º C) Operational Altitude: 0 to 6,600 feet
Operational Relative Humidity: 30º C at 93%
Non-Operational Temperature: -30 degC to 56 degC Non-Operational Altitude: 0 to 50,000 feet above sea level

Dimensions Height ....... 1.75 inches (4.445 cm) Width ........ 5.75 inches (14.605 cm) Length ....... 5.54 inches (14.072 cm)
Weight 1 Pound (0.045Kg)
Warranty Three Years, Return To Factory
Ordering Information Main Unit Part Number: 273000
Model: A/B Switch RS-232
Description: 2-Port A/B Switch with Common
Included with each unit: 1) Operations Manual
2) PT# 711019: AC to DC Power Supply N America For further detailed technical information on this prod- uct, contact East Coast Datacom Technical Assistance toll free at (321) 637-9922