User manual

101

USER MANUAL

6. Digital Communication Standard - Contact ID Protocol for WT-1010C2

Objectives

a) Provide information regarding events that are occurring on a customer’s premises.

This information should be in a form that can easily be interpreted by a central

station operator.

b) Spend minimum practical time on line per transaction, to minimize the number of

receivers required to handle the traffic and minimize the time the line is seized

and not available to the customer.

c) Minimize the transmission error rate.

Tolerances

Unless otherwise specified, the tolerance for measurements specified within this

standard shall be 10 percent (±10%).

Transmission Components

The transmitter to receiver communication session is composed of three basic

elements: the Handshake Tone sequence, Message Blocks, and Acknowledgements.

The Handshake Tone sequence consists of a pair of single-frequency tones

sequenced in time.

The Message Blocks consist of a series of DTMF tone bursts separated by spaces.

The Acknowledgement Tone is a single tone burst.

Handshake Tones

The Handshake Tone sequence is produced by the RECEIVER. The purpose is to

signal the TRANSMITTER that the communication channel is ready.

Placement

The Handshake Tone sequence is emitted by the receiver after going off-hook and

delaying an interval of at least 0.5 seconds but typically no greater than 2.0 seconds.

This time allows the phone network connection to settle before the communication

process begins.

Composition

The handshake tone sequence shall consist of:

WT1010C2 – USER MANUAL – Rev.2.7 – Technical Support : Technical@witura.com