Specifications
LBI-39062
7
CEC/IMC Interface
The PC's COM1 serial port provides the control data
connection for the C3 Maestro. This serial data link
between the Maestro and the Console Interface Module
(CIM) within the CEC/IMC can be configured for RS-232
or RS-422 operation. Detailed configuration and wiring
information is contained in the Installation, Set-Up and
Testing maintenance manual (LBI-39055) included with
this manual set.
LOGIC BOARD
The Logic Board is installed in one of the PC's internal
expansion slots. It contains interface circuitry for the
Dispatch Keyboard and the Audio Tower. Connections are
made at the Logic Board's rear cover plate on the back of
the PC. The Dispatch Keyboard connects to the Logic
Board via a round 4-pin interlocking plug and the Audio
Tower connects via an interconnect cable with DB-37
subminiature type connectors on both ends.
Using the Logic Board, all Audio Tower functions are
controlled via the 37-conductor interconnect cable.
Basically, this cable provides a parallel-type interface.
Switching signals are sent through the cable only when an
event, such as a console PTT, occurs. Other than PTT pull-
up and Vu meter dc voltages, the cable is idle at most
times. This prevents induction of unwanted signals into the
audio system.
Many console audio routing functions are controlled
directly by the Logic Board without PC intervention. For
example, when the Logic Board senses a microphone
change via a mic jack sense line from the Audio Tower, it
switches the matrix circuitry on the Audio Matrix Board
appropriately.
DISPATCH KEYBOARD
("CUSTOM KEYBOARD")
The C3 Maestro's Dispatch Keyboard provides instant
dispatcher operations. Keys with similar functions are
grouped together and most frequently used key groups are
located near the bottom of the keyboard for quick and easy
access. For example, transmit and module pick keys are at
the bottom. Seldom used keys are located near the top of
the keyboard. Key groups include:
• a selected transmit (PTT) key
• fourteen (14) module pick keys
• fourteen (14) instant module transmit keys
• nine (9) module control keys
• three (3) emergency keys
• nine (9) edit control keys
• three (3) tone keys
• a numeric keypad (telephone style)
• eight (8) common control function keys
ESC
F1 F2
F3 F4 F5 F6 F7
F8 F9
F10
SIMULSELECT
CALL
RLSE
CALL
HOLD
CALL
ANSR
CALL
FNCS
PHN / ICOM
TX
PICK
MODULE CONTROL EMERGENCY
ALRM
RST
EMR
CLR
EMR
DCLR
SIMUL
S1 S2
S3
S4
VIEW
PATCH
TONES
ALRT PLSE WRBL
COMMON CONTROL FUNCTIONS
TELEPHONE/ICOM
C3 Maestro
ABC DEF
GHI JKL
MNO
PRS
TUV WXY
*
12
3
456
78
9
0
#
CLR
EDIT CONTROL
HOME
END
PAGE
HIST
SCRL
PAGE
DWN
UP
INSTANT TX
SELECTED TX
P1 P2 P3 P4 P5
PTCH
VIEW
P1
P2 P3
P4
P5
TX TX
TX
TX TX
ENTER
6
MODLMODL
7
13
12345
MODLMODLMODLMODLMODL
8 9 10 11 12
MODLMODLMODLMODLMODLMODLMODL
14
MODLMODLMODLMODLMODLMODLMODL
MODLMODLMODLMODLMODLMODLMODL
1234567
8 9 10 11 12 13 14
TX TX TX TX TX TX TX
TX TX TX TX TX TX TX
MODULE
SELECT
VOL VOL MODLMODLCONV
MUTE MDFY FNCS
MODLMODL
FNCS HIST
PVT
MENU ALL SEL
HELP
MAIN MUTE ICALL
TX TX TX
ALT
PRMT DRCR ICALL
Figure 2 −− C3 Maestro Dispatch Keyboard