Electronics

model RS-G/4
Installation Instructions

The RS-G/4 converts switch closures, relay closures, or logic levels to serial commands for the RS422 protocol as used by most video tape recorders. The -G/4 has switch inputs for Stop, Play, Pause, and Rewind (Command Set A) or Stop, Play, Pause, and Record (Command Set B). Custom command sets are also available.

All contact closures should be at least 20 milliseconds in length. There is no maximum closure limitation other than all GPI input scanning stops until all inputs have returned to open-contact conditions.

The RS-G/4 adapter simply plugs into the RS422 port of the VTR or digital disk recorder. The RS-G/4 derives its power from the RS422 port and no other power source is required. The Remote/Local switch on the deck's front panel also needs to be in the Remote position in order for the serial interface to control the deck.

RS-G/4 Connections (9-pin D female on the adapter)

Stop (pin 1)
A contact closure to ground causes the deck to Stop and unthread the tape.

Play (pin 2)
A contact closure to ground causes the deck to Play.

Pause (pin 3)
A contact closure to ground causes the deck to Pause (if already playing).

Rewind or Record (pin 4)
A contact closure to ground causes the deck to Rewind or Record.

Ground (pin 5)
This pin is the reference, or return path, for all of the above connections.

Addenda Electronics
PO Box 907
Monterey CA 93942-0907

Phone: 831 372 6205
Fax: 831 372 6192
Web: www.addenda.com