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3.3
STATUS DISPLAY
The Station Parameter
Status Display Matrix consists of
eight 8 element
LED packages
located behind the re-
cessed sceened
panel of the DMP. The screening identi-
fies each of 641vlUXbus bits, via a specific mnemonic des-
ignation, as shown in Thole 1.
The STATUS DisplaY.Pl"()vides a visible indication of the
major portion of the main control related activities that
are occurring at any timejn. the station. These include var-
ious push-to-talk
signals, the state of the squelch circuits,
the presence
of properly coded squelch signals, the sta-
tion channel,
the station-level
alarms and "wild" card
functions, as well as specialized activities such as
Chan-
nel-Scan
or
DVP
operation.
NOTE
To check to see if all the LEDs in this sec-
tion of DMP are functional,
momentarily
switch the ENIER
DATA-TEST
switch to
the TEST position.
AU 64 LEDs in the
STATUS display area should light, and the
two-digit CHANNEL
display should indi-
cate $FF.
The STATUS Display indicates the active control condi-
tions within the station with a corresponding
illuminated
LED. The absence of an expected condition can be readily
observed as the station is operated,
leading to rapid iden-
tification of a defective area.
To simulate an active condition
in the station using the
DMP, select the address or row in the display containing
the particular signal with the ADDRESS
switch. Next, set
one of the data switches DO through D3 corresponding
to
the column in the display containing the signal. Momen-
tarily switch the ENTER DATA-TEST
switch to the EN-
TER DATA position and the condition will become ac-
tive. To clear the condition, return the data switch to the
OFF position and flip the switch to the ENTER DATA
position once again.
CAUTION
It is recommended
that the DMP be dis-
connected from the control tray (via J8oo)
during station power up. This prevents the
station from being initially activated
in a
possible undesirable
function. However, if
the station is powered
up with the DMP
connected,
and an undesirable
condition
does occur, place the four DATA switches
to the OFF position, and then toggle the
ENTER DATA switch. This will deactivate
the four DMP data bits applied
to the
MUXbus Data Line and remove the unde-
sirable condition
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An active condition is also cleared when the ADDRESS
switch is moved to a different
address, and the ENTER
DATA switch is used to activate a MUXbus bit at the new
address.
For example, suppose
it
is desired to verify that the proper
alarm tones would be sent by the station in the event of
a PA failure. To simulate this alarm condition using the
DMP, set the ADDRESS
switch to 12 (the row containing
the PA alarm signal) and flip the data switch up (for the
column
containing
this signal (D1). Flip the ENfER
DATA switch, illuminating
the LED in the status display
for PA alarm and activating a simulated PA failure alarm.
If the station is working properly, two beeps will be heard.
If the Dl switch is turned to the OFF position and the EN-
TER DATA switch is activated,
the PA alarm LED will
tum off, and the alarm beeps will cease. Likewise, if the
ADDRESS
switch is moved to address
1, and the D1
switch is left in the up position, then when the ENTER
DATA switch is activated, the PA alarm LED will turn off,
the alarm beeps will cease, the LOCal PTf LED will illu-
minate, and the station will key up.
NOTE
"Status only" bits, when activated by the
DMP, will cause their corresponding
LED
to light, but will not affect a change in sta-
tion operation.
The station causes these
LEDs to light when
it
has successfully ac-
complished
a certain function.
4. MUXBUS BIT DEFINITIONS
4.1
INTRODUCTION
The following paragraphs
provide definitions for each of
the 64 operating parameters
(MUXbus Bits) displayed by
the DMP. Each of these bits may have their state changed
by the DMP. Each paragraph
title gives the MUXbus Bit
mnemonic, definition, and row-column
address required
for access (in the form: #, D#), respectively.
4.2
SP XMIT (SPECIAL TRANSMIT)
0, D3
The SP XMIT bit indicates that the deviation and/or the
rf PA power should be either boosted or cut, defined by
information
in the station control module code plug. The
default condition in the station control module code plug,
upon activation of this MUXbus bit, is deviation control.
This bit will only have an effect during a PIT. The activa-
tion of this bit, by itself, will not key the station.
4.3
SCAN (SCAN ENABLE) 0, D2
The SCAN bit forces the station control module to enable
the primary receiver as a scanning receiver. The station
must be ordered
with the
Channel-Scan
option in order
for this feature to operate. Only the primary receiver can
scan.
5
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