NorthStar MX500 Operator's & Installation Manual page 236

Installation Manual
The hardware interface is accomplished by connecting the RJ-45
connectors of the MX 500 units using a cross-over (null) LAN cable
(for two units) or CAT5 Ethernet cables with an Ethernet switch (for
more than two units). You can purchase a pre-made LAN cross-over
cable or CAT5 Ethernet cable assembly from BNT-ME dealers or you
can make it up yourself using the diagram below.
The interface between the two (or more) units takes place over a high
speed (100 Mbps) data link. The master unit must be connected to the
smart GPS antenna unit (MX421, MX521, MX525, or MX575). The mas-
ter unit receives the position data then transfer it to the slave unit(s) 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 (or more) units.
When the two (or more) units are first configured as master and slave(s),
the master listens for a configuration polling message from the slave(s).
Once the master recognizes the slave's polling message, the Common
Data Base (see Table below) is downloaded from the master to the
slave(s). This function also takes place each time the units are powered
up.
222
Mx500
MASTER UNIT
LAN
RJ-45
Connector
LAN TX + 1
LAN TX -
2
3
LAN RX +
4
NC
5
NC
6
LAN RX -
7
NC
NC 8
MX500 LAN Cross-over (Null) Cable Diagram
Installation Notes
Mx500
SLAVE UNIT
LAN
RJ-45
Connector
LAN TX +
1
LAN TX -
6
7
LAN RX +
4 NC
NC
5
LAN RX -
6
7
NC
8
NC
No Antenna
Connected
Version 3.0