www.javad.com Maxor Operator’s Manual 2-29
CONFIGURATION
Radio Configuration
3. From the Link Rate control, select the rate at which data is
transmitted over the RF link. The JNS 2W UHF 410-470 radio
transceiver supports 4800, 9600, and 19200 baud. Note that this
setting affects the Modulation Type control and vice versa
4. From the TX control, sel
ect the operating frequenc
y that will be
used by your base radio-modem to transmit differential data.
5. Select Scrambling (see Figure 2-22 on page 2-28). If enabled, this
parameter provides more robust data communications over the
areas with possible interference.
6. For a maximum data communication reliability,
select the Forward
Error Correction check box (see Figure 2-22 on page 2-28). With
this parameter enabled, the rover radio-modem has the capability to
check
and correct transmission errors (if any) in an incoming data
stream.
Notice:
While providing error control in data transmission, FEC
adds redundant check bits to the data stream reducing
data throughput. If you are going to use FEC and a format
of differential messages requires a great deal of data
(e.g., RTCM 2.x) transmitted over the radio link, it is
recommended to select 19200@4-Level-FSK. This will
ensure reliable radio communication between the base
and rover receivers.
7. From the Protoc
ol Mode control, select the appropriate link
protocol among the following available:
• Transparent w/EOT Character
• Transparent w/EOT Timeout
•Fast Async
8. If you select T
ransparent w/EO
T Character, the EOT
Character (Dec) field will be displayed. In this field enter a
decimal value (usually a control character). Once the specified
character is found in the incoming data stream, the modem begins
data transmission.
If you select Transparent w/EO
T Timeout, the TX ACK Timeout
(in x10 ms) field will be displayed. In this field enter an integer
value between 1 (corresponds to 10 ms) and 50 (corresponds to 500
ms). Once the timeout between incoming data exceeds the specified
value, the modem begins data transmission.
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