Topcon America 050902 Installation Manual
Topcon Positioning Systems, Inc.
7400 National Drive Livermore, CA 94551
GR-3 MANUAL ADDENDUM FOR DIGITAL UHF RADIO
A. Configuring a Base Station’s Digital UHF radio modem in PDL
Mode
Note: To comply with RF exposure requirements, maintain at least 25cm between the
user and the radio modem.
For the GR-3 Digital UHF, the integrated radio modem provides TX/RX UHF
communications between a Base Station and Rover. To configure the UHF radio
modems, have the following ready:
• PC running Windows 98 or later
• Modem-TPS 2.1p0 or later
• Serial cable or Bluetooth connectivity with PC
1. Connect the computer and receiver using an RS-232 cable or Bluetooth
wireless technology.
2. Turn on the receiver.
3. Open Modem-TPS and select the COM Port the receiver is connected to.
4. Click on Connect.
5. On the Radio Link tab, set the following parameters for the base station’s
radio modem in PDL protocol:
P/N XXXX-XXXX
1
Topcon Positioning Systems, Inc.
7400 National Drive Livermore, CA 94551
• Protocol – Select PDL w/EOT.
• Modulation Type – the modulation for PDL protocol is GMSK.
Link Rate – the default link rate for GMSK is 9600 and is
recommended for most applications. The link rate is the rate at
which data is transmitted over the RF Link.
• Mode – The Radio Operation mode. The GR-3 Digital UHF can be
set to Transmit and Receive in PDL Mode.
• Scrambling – Enable to provide more robust data communication
over high interference areas
• Forward Error Correction (FEC) – enable to maximize data
communication. With this parameter enabled, the rover radio
modem has the capability to check and correct transmission errors
(if any) in an incoming data stream.
NOTE: FEC reduces data throughput by adding redundant check
bits to the data stream. If using FEC with a differential messages
format that produces a great deal of data, select a link rate of 19200
and a modulation type of 4-level FSK to ensure reliable radio
communication between receivers.
• Channel – The current Transmit/Receive frequency channel in
MHz
• Output power – Select the level of power for RF transmissions
ranging from 10 mW to 1W.
6. After completing steps 1-5 in “Configuring a Base Station’s UHF Radio
modem”, click on the Serial Interface tab.
7. On the Serial Interface tab, select a baud rate for the modem’s serial port.
The same rate must be used for both the receiver and the transmitter. The
recommended baud rate is 115200.
8. On the Serial Interface tab, select the Ready to Send/Command to Send
(RTS/CTS) to be ON.
P/N XXXX-XXXX
2
Topcon Positioning Systems, Inc.
7400 National Drive Livermore, CA 94551
9. Click Apply, and then click on File-Disconnect. To close Modem-TPS,
choose File-Exit.
10. Launch PCCDU and setup the receiver to run as an RTK Base station.
B. Configuring a Rover’s Digital UHF radio modem in PDL Mode
Note: To comply with RF exposure requirements, maintain at least 25cm between the
user and the radio modem.
For the GR-3 Digital UHF, the integrated radio modem provides TX/RX UHF
communications between a Base Station and Rover. To configure the UHF radio
modems, have the following ready:
• PC running Windows 98 or later
• Modem-TPS 2.1 or later
• Serial cable or Bluetooth connectivity with PC
1. Connect the computer and receiver using an RS-232 cable or Bluetooth
wireless technology.
2. Turn on the receiver.
3. Open Modem-TPS and select the COM Port the receiver is connected to.
4. Click on Connect.
5. On the Radio Link tab, set the following parameters for the base station’s
radio modem in PDL Mode:
P/N XXXX-XXXX
3
Topcon Positioning Systems, Inc.
7400 National Drive Livermore, CA 94551
• Protocol – Select PDL w/EOT.
• Modulation Type – the modulation for PDL protocol is GMSK
and is recommended for most applications.
• Link Rate – the default link rate for GMSK is 9600 and is
recommended for most applications. The link rate is the rate at
which data is transmitted over the RF Link.
• Mode – The radio operation mode. To set the radio as a base
modem, select Transmitter. The GR-3 Digital UHF can be set to
Transmit, and Receive in PDL Mode.
• Scrambling – Enable to provide more robust data communication
over high interference areas.
• Forward Error Correction (FEC) – enable to maximize data
communication. With this parameter enabled, the rover radio
modem has the capability to check and correct transmission errors
(if any) in an incoming data stream.
NOTE: FEC reduces data throughput by adding redundant check
bits to the data stream. If using FEC with a differential messages
format that produces a great deal of data, select a link rate of 19200
and a modulation type of 4-level FSK to ensure reliable radio
communication between receivers.
• Channel – The current Transmit/Receive frequency channel in
MHz
6. After completing steps 1-5 in “Configuring a Base Station’s UHF Radio
modem”, click on the Serial Interface tab.
P/N XXXX-XXXX
4
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