Murata Electronics North America SEM2410 Manual Do Utilizador
2000, 2001 Cirronet
Incorporated
15 022101
network
The radio in the SEM has 64 preprogrammed hopping patterns or network
numbers. By using different network numbers, nearby co-located networks
can avoid interfering with each other’s transmissions. Even if both
networks tried to use the same frequency, on the next hop they would be at
different frequencies. nwt can range from 0 to 63.
numbers. By using different network numbers, nearby co-located networks
can avoid interfering with each other’s transmissions. Even if both
networks tried to use the same frequency, on the next hop they would be at
different frequencies. nwt can range from 0 to 63.
param
This command allows certain special radio parameters to be modified.
These are only useful in debugging circumstances and should not be used
unless directed to by Cirronet Technical Support. Modifying these
parameters without direction by Cirronet may render the equipment
inoperable.
These are only useful in debugging circumstances and should not be used
unless directed to by Cirronet Technical Support. Modifying these
parameters without direction by Cirronet may render the equipment
inoperable.
show
This command displays a list of the current radio parameters including the
network number, maxremotes and the sys outmax value.
network number, maxremotes and the sys outmax value.
Distance Optimization
In installations where the distance between SEMs will be more than 1/10 of a mile, the
distance optimization parameter should be set in the remote SEMs. This parameter is set
using the
In installations where the distance between SEMs will be more than 1/10 of a mile, the
distance optimization parameter should be set in the remote SEMs. This parameter is set
using the
radio a param
command with
dx
as the sub-command. The dx sub-command
has a single argument that is a hexadecimal value between 0 and FF. The default setting
of 00H is suitable for ranges of 0 to 0.8 miles (1287 m), with optimal performance at 0.1
miles (162m). Each increment of this parameter adds 0.1 miles (162 m) to the working
range. Thus the optimal and max ranges are determined by:
of 00H is suitable for ranges of 0 to 0.8 miles (1287 m), with optimal performance at 0.1
miles (162m). Each increment of this parameter adds 0.1 miles (162 m) to the working
range. Thus the optimal and max ranges are determined by:
optimal = 0.1mi + 0.1mi x dx = 0.162km + 0.162km x dx
max = 0.8mi + 0.1mi x dx = 1.33km + 0.162km x dx
The following table presents various values of dx and the associated optimal and max
ranges.
ranges.
dx setting
range:
min
optimal
max
00H 0mi/0km 0.1mi/0.2km 0.8mi/1.3km
01H 0mi/0km 0.2mi/0.3km 0.9mi/1.5km
04H 0mi/0km 0.5mi/0.8km 1.2
01H 0mi/0km 0.2mi/0.3km 0.9mi/1.5km
04H 0mi/0km 0.5mi/0.8km 1.2
mi/2.0km
06H 0.1mi/0.2km 0.7mi/1.2km 1.4mi/2.3km
09H 0.4mi/0.7km 1.0mi/1.6km 1.8
09H 0.4mi/0.7km 1.0mi/1.6km 1.8
mi/3.0km
13H 1.4mi/2.3km 2.0mi/3.3km 2.8mi/4.7km
31H 4.4mi/7.3km 5.0mi/8.3km 5.8
31H 4.4mi/7.3km 5.0mi/8.3km 5.8
mi/9.7km
45H 6.4mi/10.7km 7.0mi/11.7km 7.8mi/13.0km
64H 9.4mi/15.7km
64H 9.4mi/15.7km
10.0mi/16.7km 10.8mi/18.0km
C8H 9.4mi/32.3km
20.0mi/33.3km 20.8mi/34.7km
FAH 4.4mi/40.7km
25.0mi/41.7km 25.8mi/43.0km