Appendix D - Dual Control Head Mode - Leica MX400 Operating Instructions Manual

Operator's Manual

Appendix D - Dual Control Head Mode

The Dual Control mode, which is enabled in the CFG Dual Contr.
screen, allows you to connect two receivers in a Master / Slave
configuration where a common data base is shared between the two
receiver control heads. This configuration also allows you to use
one antenna connected to the Master unit, for both receivers. The
three remaining data ports, the MOB / Event input port, and the
alarm output ports are still available on each unit for individual use
on each receiver.
The hardware interface is accomplished by connecting NMEA
Output 4 to NMEA Input 4 between the two units. Refer to the
Installation & Service Manual for the appropriate pinouts.
MX 400 Professional DGPS Navigator
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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 satellite signals and beacon or external
RTCM SC-104 DGPS correction signals and performs the position
calculation function. The resulting position fix data is then trans-
ferred to the slave unit at a one second rate (the same as the position
calculation). 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
master unit mirrors to the slave, and the Common Data Base (see
Table D-1) 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 CFG1 Dual Control screen active, the status bar
will indicate Mirroring during the database update period.
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Appendix D - Dual Control Head Mode
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MX 400 Professional DGPS Navigator
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