RV-M50-E Technical Manual
13
2
500kHz
26dBm
To comply with FCC regulations, 125kHz channels may only be used if exactly one 500kHz channel and
exactly two 125kHz channels are in use.
1.1.12.
Channel Data Rate
Channel data rate is set with
ATR2 <rate>
, where
<rate>
is set according to the table below:
ATR2 Setting
Bit Rate for 125kHz Channels
Bit Rate for 500kHz Channels
6
9.37 kbps
37.50 kbps
7
5.46 kbps
21.87 kbps
8
3.12 kbps
12.50 kbps
9
1.75 kbps
7.03 kbps
10
3.90 kbps
11
2.14 kbps
12
1.17 kbps
Note that adjusting data rate will affect maximum allowable packet size.
1.1.13.
Channel Occupancy
Regardless of the number of channels employed, a channel may not be used for longer than 400mS in a
period of 400mS * channel count, to comply with FCC 15.247(f). The modem automatically enforces this,
and may temporarily delay a transmission to comply as needed.
3.4
Data Transmission
To transmit data, send one or more bytes of data into the serial port of the modem. When a full packet
of data has been collected into the internal buffer of the modem; there is a pause in the data per ATR3;
or the maximum packet size is reached, the modem will automatically key its transmitter, and send the
data over the air.
3.5
Position Transmission
Position Transmission is enabled by setting either TXRATE or IDLERATE to a nonzero value.
When position transmission is enabled, the device will send its position and other status information
over-the-air automatically, per the configurations below.
1.1.14.
Idle Transmission Rate
IDLERATE sets the idle reporting interval. This should be set to the longest acceptable time between
position reports. Conditions (detailed in the following sections) can cause the modem to transmit faster
than the IDLERATE. Set to 0 will disable any idle reporting.
1.1.15.
Active Transmission Rate
TXRATE sets the active transmission rate. This is the rate the modem will send its position when one of
the conditions below arises, which can be enabled or disabled individually:
1.
Motion
2.
Distance Traveled
