Murata Electronics Corporation 20 6/2/2021
Set Default Handle
Sets handle number between 1 and 62 inclusive for a remote. This handle will override the
automatic handle assignment by the base station. This command can be used in applications
where it is desired to have specific modems have specific handles. When specified for the
base, the default handle determines which remote it will address when transparent protocol
mode is in effect. When 3FH is specified for the base, broadcast mode is entered.
Enable Global Network Mode
For networks with multiple base stations, remotes are ordinarily only able to link to one base
station, set by the hopping pattern. Mode 1 enables the global mode that allows remotes to
link to any base station they can hear, acquiring whatever hop pattern is required. In this
mode a remote can only change base stations once it is no longer registered with a base
station. Mode 2 enables seamless roaming where a remote will seamlessly register with a
new base station based on received signal strength before it has lost registration with the old
base station. To implement seamless roaming without the potential for data loss,
synchronization between base stations is required. This feature is available in the SNAP2420
family of products.
Set Hopping Pattern
The WIT2420 has 64 preprogrammed hopping patterns (also referred to as network
numbers). By using different hopping patterns, nearby or 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.
Set Transmit Power
The WIT2420 has two preset transmit power levels, 10mW (10dBm) and 100mW (20dBm).
Control of the transmit power is provided through this command. Default is 100mW.
Read Receive Signal Strength Indicator (RSSI)
This command reports the relative signal strength averaged over the last 10 hops. This
command returns a one byte value that is proportional to received signal strength and can
range from 00H to FFH. Typical values range from 30H to 80H where the lower the number
the lower the received signal strength and the higher the number the higher the received
signal strength. This is a relative indication and does not directly correspond to a field
strength number. This is available only at the remotes as the base station is the only source
that transmits on a regular basis. Plus, in a point-to-multipoint network the base will receive
different signal strengths from each remote.
Set Range Optimization
For ranges in excess of 1.1 miles, this command optimizes the over-the-air timing to provide
the most robust communications. Each increment of this parameter adds 0.101 miles to the
default 1.1 mile optimized range. For example, for a communications range of 2 miles, set
this parameter to 09H to optimize the timing for 1.1 + 9 x 0.101 = 2.09 miles.
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