Siera Wireless MP555, Software Installation Manual

Page: 30 / 74

MP 555 GPS Software Installation and Configuration Guide
28
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GPS module. The f
details on the commands listed here (
2130304
GPS protocols and commands
Note: The “MP Rugged W
Modem TAIP Reference”
(document number 2130312
provides a description of the
TAIP commands that can be
used with the MP 555 GPS
modem. This is available on the
reless web site,
www.sierrawireless.com. Infor-
mation about the Lassen SQ
GPS modules, including more
documentation on TAIP
commands, is available at
. When
configured for NMEA, the GPS
module is mited to NMEA GGA
and NMEA VTG messages only.
More information on NMEA
message standards is available
www.nmea.org
The GPS module supports two methods of reporting naviga­
tional information, using either the TAIP (Trimble ASCII
Interface Protocol) or NMEA (National Marine Electronics
Association) protocols. When the MP 555 GPS is shipped from
the factory, the GPS module is configured for TAIP. If you are
using a GPS application that requires data to be reported
according to the NMEA protocol, the modem must be recon­
figured using an AT command. (See the next section.
NMEA is a reporting protocol only, while TAIP provides the
ability to send commands to the module to query for infor­
mation and configure reports. When the modem is set for
TAIP, TAIP commands can be sent to the modem in these
ways:
Using AT commands. (See the next section.
Using the RNAP and MT protocol (described in Chapter
Using Watcher. See page 30.)
TAIP commands can be used to:
Query the modem for its current position, heading, and
speed.
Enable and disable automatic reporting of GPS data, and
(if enabled) set the interval at which automatic reports are
sent.
Configure the format of the reports.
GPS configuration using AT commands
The table on the next page lists the AT commands that allow
you to retrieve GPS data from the modem and configure the
AT Command Re erence (document number
2130335) describes how to establish a session that allows you
to send AT commands to the modem and provides more
as well as all the other AT