Operation
RFI-9256 Radio Modem User Manual
Page 38 of 109
other route can be matched in the routing table. On slave units this destination address must always
be the address of the master unit.
Single route:
This route explicitly maps a single RTU address to a radio address. If a single route
exists, then it overrides any matching mapped route or range route.
Mapped route:
This route maps a relationship between RTU addresses and radio addresses. This is
an efficient method of describing a network providing the RTUs and radios are numbered
sequentially. This route configuration requires an RTU address to be assigned as the base address
for the route and an end RTU address to define the range of addresses to be used by the route. It
also requires a radio address associated with the base RTU address.
The decoder subtracts the RTU base address from each decoded RTU address. This result is then
added to the radio base address. Consider the situation shown in Figure 13.
Controller
RFI-9256
Master
Main
RFI-9256
Slave
Addr=1000
RTU
20
Main
RFI-9256
Slave
Addr=1001
RTU
21
Main
RFI-9256
Slave
Addr=1002
RTU
22
Main
Figure 13: Range routing relationship between radio address and RTU address
The base RTU address is 20.
The end RTU address is 22, therefore the range of RTU addresses is 20, 21 and 22.
The base radio address is 1000 with port extension 00 (main port).
