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X21

Uses X21 dialling for numbers in the DVST menu

Connection can be made in the direct mode, where the number to be called is stored in

the terminal adapter, or in the X21 dialling mode where the DVST passes the number to

be dialled to the Terminal Adapter, or ATMODE.

V35

V35=ON/OFF

Applicable in all modes (ATMODE, DIRECT and X21)

8.2 Connecting a terminal adapter in direct mode

This uses the signalling lines; C (control) and I (indicate), to respond to and initiate calls.

Making a Call

The DVST initiates a call by raising C

The TA then dials its stored number

When the call is connected the TA raises I

Call continues

Answering a Call

The TA indicates an incoming call by raising I

The DVST responds by raising C

Call continues

Call disconnection

The DVST ends a call by dropping C

The TA confirms disconnection by dropping I

Configuring a Terminal Adapter for direct mode operation

As the control linesI&Careused to control calls, the following is required of the system:

Answer : C

Originate : C

Disconnect : C

Alerting : I

DCD/I : Delay

Note: The above settings are the basic requirements. TAs have many other settings which

can affect transmission such as speed of call, type of call, circuit switch etc.

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Terminal Adapters DVST Installation Guide

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Guardian Technologies , LLC Home Security System DVST User Manual Page 44