Transparent Data Transmission
Radio Protocol Support
15
SRL-35 Operator’s Manual P/N: 1003224-01
Radio Protocol Support
The SRL-35 radio modem supports the following radio protocols for data transfer.
•
Satelline-3AS
•
PCC 4-FSK
•
PCC GMSK
•
TrimTalk450s(P)
•
TrimTalk450s(T)
•
PCC-FST
The SRL-35 radio modem supports additional to the original SATEL 3AS data transfer also:
•
Pacific Crest compatible data transfer over the air, if the opponent Pacific Crest modems operate in
the transparent mode/FEC ON/Scrambling ON that is the most common setup among RTK
applications. The other modes are currently not supported.
•
TRIMTALK® 450s compatible data transfer over the air.
The SRL-35 radio modem provides the following radio compatibility settings:
•
Pacific Crest 4-FSK modulation, Transparent mode/FEC ON/Scrambling ON.
•
Pacific Crest GMSK modulation, Transparent mode/FEC ON/Scrambling ON.
•
TRIMTALK GMSK modulation, Transparent mode
•
TrimTalk450s(T) = TrimTalk450s GMSK (RX fitted to Trimble transmitter)
•
Pacific Crest-FST = Pacific Crest Transparent FST (4-FSK), FEC ON/Scrambling ON.
So far, only the transparent mode is implemented, since it is the most commonly used and recommended
by the user manuals. The ARQ based protocols with ACK/NACK schemes are not preferred in RTK applica-
tions that apply one-way communication.
Table 13. Radio Protocols
a
a. Use of PDL and Satel protocols is recommended in applications where possible.
Compatibility with TrimTalk is subject to some restrictions.
Protocol Modulation
Link rate
(@ 12.5 kHz)
Link rate
(@ 25 kHz)
Satelline-3AS 4-FSK 9600 19200
PCC 4-FSK 4-FSK 9600 19200
PCC GMSK GMSK 4800 9600
TrimTalk450s(P) GMSK 4800 9600
TrimTalk450s(T) GMSK 4800 9600
PCC-FST GMSK 9600 19200
Refer to “Settings” on page 20 for setting the radio protocol.
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