Multi-Tech Systems CDMA Wireless Modem - Manual (Page 87)

Chapter 13 – Position Determination (GPS) AT Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 87
C
HAPTER
13 - P
OSITION
D
ETERMINATION
(GPS) AT C
OMMANDS
These AT commands are supported on gpsOne equipped CDMA modems. GpsOne is a wireless-assisted
hybrid solution that utilizes both GPS and base-station trilateration to determine the mobile positions in more
covered situations other than GPS alone.
The following includes several set-up commands (+WPDST, +WPDOM, +WPDDD, +WPDFR, +WPDPL), the
start-session command (+WPDSS), the end-session command (+WPDES), and responses. Setup
commands are not required in most cases (as defaults will be provided) before the start-session commands.
Note that these commands are preliminary. Changes may be made when carrier plans for location services
are more readily available.
Position Determination Session Type +WPDST
Description: This command sets and returns the PD session type.
Values: <type>
0: session to provide the last position info available
1: session to provide single-shot fix
2: tracking mode independent fixes – session to provide continuous independent
position fixes
3: tracking mode – session to provide continuous position fixes
4: data download – session to download ephemeris/almanac data only to minimize
delays to obtain future fixes
Note that when a tracking mode is requested (continuous position fixes) and the TCP/IP
transport layer is used, the position fixes will not be retrieved until the data call ends. Only
the last 10 position fixes will be presented.
Syntax: Command syntax: AT+WPDST=<type>
Command Possible Responses
AT+WPDST?
Note: Request current setting type +WPDST: 0
OK
AT+WPDST=0
Note: select the last position info available OK
+CME ERROR: tbd (PD session already active)
AT+WPDST=9 +CME ERROR: tbd (invalid PD parameter)
Note that these 2 errors can happen on all +WPD requests below, and may not be listed.