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RF Neulink
NL6000 User Guide
17
If a reliable path does not exist between a remote unit and a base
station, you can configure one or more NL6000 units as a repeater to
reach the hidden unit. The repeater can work with both simplex and half
duplex networks. See Section 5.5 for additional detail on the unique
behavior of a repeater unit.
You can select from three radio channel transmission modes that provide
increasing levels of error control. By evaluating the signal strength and
path between two modems, you can select a transmission mode that
results in the best performance. See Section 5.6 for a description of each
transmission mode.
5.3. Unique Data Requirements for a Base Station
When configured as a base station, there are specific requirements for the
data strings sent through the NL6000s serial port. Because a base station
is the central point of a network, it must be able to selectively transmit to
any remote. To provide for selective destinations, each data string coming
into the serial port must begin with a colon (:) followed by four ASCII
characters that specify the destination TOID. The data string must
immediately follow the ASCII characters with no pause between them as
in the example
:
:ABCD[user data]
5.4. Source and Destination Addressing
Specify a unique identification number for each NL6000 unit in the
network plan. This number, the MYID, references the source of the data
packet. The TOID is the destination address for the packet, so the TOID is
the MYID of the unit for which the data is intended. Both the MYID and
TOID are a hexadecimal value from 0000 to FFFF. Figure 7 illustrates
point-to-point addressing.
Figure 7: Point-to-Point Addressing
Use the FF character as a wildcard to designate a group of destination
units. For example, a TOID may be FF56 or 42FF. A packet sent with a
TOID of FF56 is a match to destination units with a MYID of 1256 and
8856. A packet sent with a TOID of 12FF is a match to destination units
with a MYID of 1277 and 1219. A TOID of FFFF is a broadcast to all units.