• Four position coaxial antenna switch.
• Safety features prevent “hot switching”.
• Radio sense allows auto-off control to ground all positions.
• RF power: 1500 watts HF, 1000 watts 6 meters.
• Frequency range: 1.8 – 54 MHz
• Isolation: >50 db
• Loss: <1 db measured on 14 MHz.
• Serial Interface: TTL 2400 baud 8-N-1.
• Connector: 1/8" stereo. tip - RX, ring - TX, shield.
• Power requirements: 11 – 15 volts DC at 100 mA maximum
• Switch Size: 7.5” W x 4.5” D x 2.5” H
• Remote Size: 4.5” W x 3” D x 2.25” H 
• Weight: 1 lb.
  
  N4PY has added DTS-4 support to their popular rig control software. www.n4py.com.

          Add a serial interface to your computer with a TTL to RS-232 converter by Holland Electronics. Designed specifically for the LDG coax switches, it is bi-directional, using optical couplers.  It's inside a DB9 hood, and has a 6' cable with a 3.5MM 3-cond plug.  It's $33 shipped.