Unit has positioned on top 1/4" Phone Jacks for Transmit Port B, A, and Dial. It has Dip Switch Setting for Address, & Modem, GPIC/IEEE488 Connector, Modem/DCE and Peripheral/DTE 25-Pin Female Connectors.
Provided Inputs are for Sequencer, Functions, Modes, Entry, and an area for output codes via LED.
Sierra 809B