User's Manual

Trimble R7/R8 GPS Receiver User Guide 115
Setting up the Receiver 13
Trimble R8 GPS Receiver Operation
131.2 Cellular modems and external radios
For a data communications link, you can use an internal or external
radio, or an internal or external cellular modem.
To connect an external cellular modem to a Trimble R8 receiver, you
need the following:
• A Trimble R8 receiver.
• A cellular modem, or a cellphone that can transmit and receive
data.
• Serial (cellphone to DB9) cable (supplied with the cellular
modem or phone).
Note – For more information, refer to the document Using
Cellular and CDPD Modems for RTK, which is available from
the Trimble website.
• Port 2 of the receiver supports full RS-232 protocol, and should
function properly with most cellular phone cables. Some cellular
units may require custom cabling.
Alternatively, the receiver also supports a cable-free Bluetooth
connection with Bluetooth enabled cell phones.
For more information on using an external cellular modem as a data
link, refer to the Trimble Survey Controller User Guide.
To connect an external radio modem to a Trimble R8 receiver, you need
the following:
• A Trimble R8 receiver.
• An external radio capable of receiving and decoding Trimble
data packets.
• Serial cable for either Port 1 or Port 2 of the Trimble R8, as
supplied by the radio manufacturer.
• Radio mount for the range pole.