Esc-864 Controller Circuit Board; Tone Generator; Digital Voice (Option); Landline Or Rf Link Interfaces (Options) - Whelen Engineering Company IPS 400 Product Manual

4.1.2 ESC-864 Controller Circuit Board

The ESC-864 Controller board allows for local activation of warning signals, plus remote control interfacing. It also
monitors system status and provides visual status indicators as described in the previous tables. The ESC-864 PC board
controls the tone generator. All DTMF processing is performed on the ESC-864 board.

4.1.3 Tone Generator

The tone generator is a separate PC board that is mounted to the ESC-864 board. The tone generator receives its
commands from the ESC-864 board. All siren tones and public address audio processing are accomplished within the
tone generator. The microphone jack and microphone volume control, as well as a clipping indicator, are also part of the
tone generator functionality.

4.1.4 Digital Voice (option)

The optional digital voice module is mounted onto the tone generator in the ESC-864 case. The digital voice module
allows the IPS to store prerecorded, digitized messages for transmission over the public address portion of the system.
Prerecorded, digitized 15, 30 and 60-second messages are available.

4.1.5 Landline or RF Link Interfaces (options)

As an option. the IPS may be remotely controlled either landline or RF link. Either method communicates via a DTMF
protocol. Remote control may be one-way or two-way. The one-way option simply controls the IPS, while the two-way
option controls the IPS and reports IPS status back to a central control point.
The built-in DTMF capability responds to activation commands and generates status responses. The formats and
definitions for Activation Commands and Status Responses are described below.

4.1.6 DTMF Formats

Area Code
3 digits
Function
Area Code
Station Address
ID
CMD Group
CMD
ACTIVATION WORDS
Activation Command Format
Station Address Code
4 digits
Activation Command (Definition of above Format)
Description
3-digit code which allows up to 1000 area codes per frequency.
4-digit code assigned to each warning system within an area code.
1-digit ID code allowing up to 8 activation centers.
1-digit code allowing for 4 command groups.
1-digit code allowing for 16 commands.
9
ID & CMD Set CMD
2 digits 1 digit