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Appendix C - Multiple unit control | 151

Appendix C - Multiple Unit Control (Via LAN)

Dual Control Conguration:

The Dual Control mode allows you to connect one MX51x as a Master and another MX51x

as a Slave unit. This allows a common data base to be shared between the two CDU

control heads. This configuration also allows you to use one antenna connected to the

Master unit for both CDUs. The remaining data ports, the MOB/Event input port, and the

alarm output ports are still available on each unit for individual use on each CDU.

The hardware interface is accomplished by connecting the two units together via the

Local Area Network (LAN) port. You can use an Ethernet cross-over (null) cable or a LAN

hub (or Ethernet switch). Refer to page 77 of this manual to setup LAN.

The interface between the two units takes place over a high speed (100 Mbps) data link.

The master unit must be connected to the antenna. The master unit receives the NMEA

signals from the smart antenna and pass it along to the slave unit. 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.

Data Base Comments

Present Position Update once per second

Time Update once per second. Displayed in the same mode on both units

Date

Routes Only one unit can make changes at any given time

Waypoints Only one unit can make changes at any given time

Reset XTE Only one unit can make changes at any given time

DGPS SEtup Only one unit can make changes at any given time

Dual Control Alarms

Man Over Board Only one unit can make changes at any given time

Table D-1. Master/Slave Common Database

The items detailed in Table D-2 are independently controlled at the individual CDU heads.

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 199 200

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