User Manual

Configuration
Configuring HPT204BT
Simplex Protocol
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2.5.1. Simplex Protocol
When the HPT204BT modem is loaded with special firmware which supports Simplex protocol
1
, the
ModemVU general window will be like below:
Figure 2-4. Radio Link tab. Simplex protocol
1. On the Radio Link tab, set the following parameters (Table 2-1) and click Apply.
Table 2-1. Modem Parameters for the Radio Link Tab
1. Simplex protocol is a communications protocol that is purely one-way, and where acknowledgments are not part of any application
protocol.
Parameter Base Modem Repeater Rover Modem
Protocol Simplex Transmitter or
Simplex Transmitter to Repeater
Simplex Repeater Simplex Receiver
For Base, Repeater, and Rover modems the protocol type must be the same.
Mode receiver/
Echo to serial port
- ON- enables echoing to
serial port;
OFF - disables echoing to
serial port
Auto - allows receiving data
from base and repeater in
auto mode
1
.
Only from Repeater - allows
receive data only from
repeater
2
.
Only from transmitter to
Repeater - allows receive
data from base transmitter
3
.
Frequency
Set the frequency in band 215-255 MHz
4
with 6.25 kHz channel bandwidth.
For both Base and Rover modems the frequency must be the same.
Output power Select the transmission power
for the radio modem.
n/a
Modulation type Specifies a modulation scheme that will be used by your modem. QPSK is recommended.
For both Base and Rover modems the modulation type must be the same.
Link Rate The link rate is selected automatically