Leica Geosystems GPS System 500 - Technical Reference Manual - Manual (Page 345)

345 Appendix H Technical Reference Manual-4.0.0en
Press the OPT (F4) key to access the
GSM options. The GSM options
enable you to define the AT com-
mands used for communiction
between the sensor and the GSM
phone.
Under Type select User and modify
the remaining parameters. Alterna-
tively select a standard GSM phone
type from the list and press SET-U
(F5) to turn these parameters into
user parameters and then modify
them.
Init 1 and Init 2 - This is the initialisa-
tion sequence to initialise the phone.
Between Init1 and Init 2, a check for
the PIN is inbuilt.
Dial - This is the dialing string used to
dial the phone number. A placeholder
shall be used to insert the phone
number as defined in GSM Connec-
tion.
Hangup - This is the hangup se-
quence used to end the network
connection.
Escape - This is the escape se-
quence used to switch to the com-
mand mode before using the hangup
sequence.
The characters below may be used to
define the AT commands:
^M Inserts a carriage return and
send command
^# Inserts the phone number as
defined in GSM Connection
^S Bearer Service: Speed (Proto-
col and NetDataRate)
^C Bearer Service: Connection
Element
~ Inserts a delay of 1/4 second
^^ Insert character ^
Please refer to the instruction manual
of your GSM phone for information
about which AT commands to use.
Using the GSM Phone
The way in which GSM phones are
used for Real-Time GPS differs from
radios. The Rover contacts the
Reference. The Reference phone just
has to be switched on. One Rover
can then dial in to the Reference
Station phone. As soon as the Refer-
ence is contacted, it sends the data to
the Rover that has called it.
Therefore you can pre-define several
GSM Connections and use them to
switch between different Reference
Stations.
In CONFIGURE\ Interfaces highlight
the device to switch stations and
press CTRL (F5).