User Manual

Global Transceiver Module (GXM) Wireless Data Transceiver User Manual
LUM0031AA
Version 1.0 42
Notes: A Master with firmware before x.40 will always transmit and receive on 0. With firmware of 2.40
and greater (900MHz) or 3.40 and greater (2.4GHz) the Master may be set to use alternate
Subnet ID values. Changing these settings on the Master is not recommended under normal
circumstances.
In some MultiPoint Networks, the FreqKey will be at the same setting for all transceivers. In other
networks, where parallel Repeaters are introduced, the FreqKey value will need to change. See
FreqKey and Repeater Frequency sections earlier in this manual for more information.
If both Rcv Subnet ID and Xmt Subnet ID are set to 0 the Subnet ID will show Roaming in the
menu. This setting will allow a mobile Slave to roam from subnet to subnet and possibly from
network to network.
This drawing depicts a Network in which Subnet ID’s are used to force communications. In this example,
Repeater1 must talk directly to the Master; Repeater2 must talk directly to Repeater1. Slaves 1, 2, and 3
are forced along the direction of the solid lines. Slave4 may link to the first Master or Repeater it hears.
The respective Subnet ID diagram and settings are shown below.
Subnet ID Settings
Transceiver Rcv Subnet ID Xmit Subnet ID Other Information
Master
F F In firmware levels v2.34 and below, the Master uses 0,0.
Master
0-F 0-F
In firmware levels v2.40 and above, the Xmit Subnet ID
value may be set in the Master. The default settings (F,
F) actually use 0, 0. The Rcv Subnet ID on the Master
has no affect on the network.
Repeater1
0 1 A 0 will force the transceiver to link only to the Master.
Repeater2
1 2
Rcv SubnetID = 1 forces communication through
Repeater1. Repeater1 transmits on SubnetID 1.
Slave1
0 0 or F
Rcv SubnetID = 0 forces communication through
Master.
Slave2
1 0 or F
Rcv SubnetID = 1 forces communication through
Repeater1.
Slave3
2 0 or F
Rcv SubnetID = 2 forces communication through
Repeater2.
Slave4
0 0
The 0, 0 setting allows the Slave to link with the first
Master or Repeater it hears with the correct NetWork ID.
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