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Dual Control Head Mode
Operator's Manual
Appendix E - Dual Control Head AI/ode
The Dual Control mode, which is enabled in the CFG
Dual Contr.
screen, allows you to connect two MX 420 CDUs in a
Master / Slave
configuration where a common data base is shared between the two
CDU control heads. This configuration also allows you to use one
antenna connected to the Master unit for both CDUs. This configura-
tion requires an MX 420/8 for a master unit and a MX 420/2 or MX 420/
8 slave unit. The remaining data port/s, the MOBlEvent input port,
and the alarm output ports arestill available on each unit for individual
use on each CDU.
The hardware interface is accomplished by connecting NMEA Output
I to NMEA Input I between the two units. Refer to the Ins/alia/ion &
Service Manual
for the appropriate pin outs.
MX420/8
MASTER UNIT
MX 420/2 or MX 420/8
SLAVE UNIT
CABLEA
PORT1
CABLE A
PORT 1
No Antenna
Connected
SHIELD
PRPL [NMEA 1 OUT (A)]
PRPUWHT [NMEA 1 OUT (B»)
BRN [NMEA1 IN (A)]
BRNIWHT [NMEAl IN (B)J
co--
r
1
-
) 4 "'
£
~
I I
5
1 ,
7
v
6
"
...
4
I I
•
7
• I
...
5
f
•
1
1--
1
-
-
BRN [NMEA1 IN (A)
BRNM'HT [NMEA1IN (b)]
PRPL [NMEA1 OUT (A)]
PRPlJWHT [NMEA1 OUT (B)]
SHIELD
MX 421 Antenna
5
Connected
The interface between the two units takes place over a high speed data
link. The master unit must be connected to the antenna. The master
unit receives the NMEA signals from the MX42 I antenna and pass it
along to the slave unit at a one second rate. Due to the high speed data
link, there is virtually no visible position delay between the two units.
When the two units are first configured as master and slave, the mas-
ter unit mirrors to the slave, and the Common Data Base (see Table E-
I) is downloaded from the master to the slave. This function also takes
place each time the units are powered up. If you happen to have the
CFG 1 Dual Control screen active, the status bar wiII indicate Mirror-
--=--~Version
1.5
191
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