USGlobalsat ER-506 - Manual (Page 16)

ER-506
High Performance GPS Module
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Example 2: Enable VTG message for a 1Hz constant output with checksum enabled
＄PSRF103,05,00,01,01*20
Example 3: Disable VTG message
＄PSRF103,05,00,00,01*21
E). LLA Navigation lnitialization ID: 104 Parameters required to start using Lat/Lon/Alt
This command is used to initialize the module for a warm start, by providing current position (in
Latitude, Longitude, Altitude coordinates), clock offset, and time. This enables the receiver to
search for the correct satellite signals at the correct signal parameters. Correct initialization
parameters will enable the receiver to acquire signals more quickly, and thus, will produce a faster
navigational soution.
When a valid LLA Navigation Initialization command is received, the receiver will restart using the
input parameters as a basis for satellite selection and acquisition.
Format:
＄PSRF104,<Lat>,<Lon>,<Alt>,<ClkOffset>,<TimeOfWeek>,<WeekNo>,<ChannelCount>,
<ResetCfg>*CKSUM<CR><LF>
<Lat> Latitude position, assumed positive north of equator and negative south of
equator float, possibly signed
<Lon> Longitude position, it is assumed positive east of Greenwich and negative
west of Greenwich Float, possibly signed
<Alt> Altitude position float, possibly signed
<ClkOffset> Clock Offset of the receiver in Hz, use 0 for last saved value if available. If
this is unavailable, a default value of 75000 for GSP1, 95000 for GSP1/LX
will be used.
INT32
<TimeOfWeek> GPS Time Of Week
UINT32
<WeekNo> GPS Week Number
UINT16
<ChannelCount> Number of channels to use. 1-12 UBYTE
<ResetCfg> bit mask
0×01=Data Valid warm/hot starts=1
0×02=clear ephemeris warm start=1
0×04=clear memory. Cold start=1
UBYTE
Example: Start using known position and time.
＄PSRF104,37.3875111,-121.97232,0,96000,237759,922,12,3*37