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SEM2410

The parameter entered for length is the decimal value of the number of 625 µsec

ticks in the desired dwell time. A value of 24 (decimal) corresponds to a hop dwell

time of 15 msec and is the default.

16 is the minimum value and 28 is the maximum

value. The dwell time is changed to optimize the data throughput for a given

installation.

set selects a limited frequency band to be used. The default value is 0 which uses

the entire frequency. For operation in France use a value of 1. The SEM radio also

has 5 additional hop sets that avoid 802.11b channels. This allows the SEM to

operate in environments with an 802.11b network without interfering with the

802.11b network. The table below provides details of the hop sets.

Hop

Set

Frequency Range

802.11b Channels

Avoided

0 2401 – 2471MHz None

1 2448 – 2473MHz (France) 1-6 & 14

2 2448 – 2473MHz 1-6 & 14

3 2471 – 2497MHz 1-10

4 2452-2477MHz 1-6 & 14

5 2401 – 2425MHz 6-14

6 2409 – 2435MHz 8-14

7 2419 – 2445MHz 1 & 10-14

8 2430 – 2455MHz 1, 2 & 11-14

9 2440 – 2465MHz 1-4 & 14

The frequency of the 802.11b channel avoided refers to the center frequency of the

802.11b channel.

slave

list displays the serial numbers of the radios in the SEMs that are currently

registered with the SEM.

disconnect terminates the connection between the master

SEM and the slave SEM with the radio serial identification number entered. The

radio serial identification number must be entered with the “-“’s and can be found

using

list.

sync These commands set the operation of the synchronization signal used in co-located

SEM networks. The default mode is the sync OFF. Sync is enabled by selecting a

synchronization

master. Synchronization will occur over the RS-485 SYNC lines.

One co-located master SEM must be configured as the sync master. If sync has been

enabled, the other co-located master SEMs will listen for a sync signal from the sync

master. If no sync is heard, a co-located master SEM will make itself a sync master

and provide a sync signal. This is called the master backup override mode.

override

toggles the master backup override on and off. The default mode is ON. In

standalone SEM installations, synchronization is not required and should be left

disabled.