Ampcontrol VAA, User Manual

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VOICECOM USER MANUAL ISSUE 4
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
SPEAK
Press the Speak button to communicate with another user. This voice communication will be broadcast on
all VAAs connected to both communication lines. When pressed, a brief, low frequency tone (752Hz) is
generated, which is used to get the attention of other users. When the SPEAK button is released, a second,
brief tone (1002Hz) is heard, higher in frequency than the first to indicate that speaker has ended his
broadcast. The display shows the text
SPEACH
while the button is pressed.
NOTE: The microphone has been designed to reduce the pick up of background noise. It is therefore
necessary to speak as close as possible to the microphone.

FUNC
The FUNC (Function) button, when pressed, causes the VCA to set a flag in the Modbus data table and
asserts digital output DO2 for a period of 5 seconds. This flag and output can be used to trigger an external
event, such as making the PLC play all the active system messages. A brief tone is generated when this
button is pressed and is only heard locally at that VAA. The display shows the text
FunC
while the button is
pressed.

CALL LOCAL
The Call Local button causes the VAA to generate a (848Hz) tone while being pressed. This tone is heard at
that VAA and across the whole system. It can be used for signalling other users. The display shows the text
CALL Lo
while the button is pressed.

CALL EXCHANGE
The Call Exchange button, when pressed, causes the VAA to generate a 5 second low (200Hz) tone. If the
VoiceCom system is connected to telephone pair, this tone can be used to open a voice circuit for
communication with the surface. The display shows the text
CALL EH
while the button is pressed.
VAA Setup Mode
The VAA Setup Mode allows the VAA’s user programmable settings to be changed locally at the VAA unit. The VCA
Operation chapter describes how to program all VAA settings from the VCA. Being able to program these settings
from the VAA means that a VAA can be correctly set up when it is connected to the communication line, without
needing to go to the VCA. These settings are: