Cayman Systems 2E-H-W Manual de usuario descargar pdf (Pagina 32)

NMEA Manual based on MediaTek chipset - Manual

(11) Host -> MT3329: A PMTK660 command to request the EPH info, together with a time interval

parameter

(for example, 1800sec).

(b) MT3329 -> Host: Reply 32-bit flags of 32SV to indicate which EPHs will be available after the specified

time interval.

Command number: 660

DataField:

PMTK660, Time interval

Time interval: Set the time interval for MT3329 to reply 32-bit flags of 32SV. Note that the Time interval > 0 and

<= 7200 (2 hours).

Example:

$PMTK660,1800*17<CR><LF>

Reply:

$PMTK001,660,3,40449464*17<CR><LF>

The Hex 40449464 means 01000000010001001001010001100100 and the Valid SV’s numbers are

2,10,14,17,20,22,26,27,30.

4.4 PMTK661 Q AVAILABLE SV ALM

Command purpose:

Query valid almanac after specified interval.

(a) Host -> MT3329: A PMTK661 command to request the almanac info, together with a time interval

parameter (for example, 30 days).

(b) MT3329 -> Host: Reply 32-bit flags of 32SV to indicate which almanac will be available after the

specified time interval.

Command number: 661

DataField:

PMTK661, Time interval

Time interval: Set the time interval for MT3329 to reply 32-bit flags of 32SV. Note that the Time interval > 0

Example:

Indicate which almanac will be available after 30 days

$PMTK661,30*1C<CR><LF>

Reply:

$PMTK001,661,3,fec0bfff*49<CR><LF>

The Hex fec0bfff means 11111110110000001011111111111111 and the Valid SV’s numbers are

1,2,3,4,5,6,7,9,10,17,19,20,21,22,23,24,25,26,27,28,29,30,31,32.

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Cayman Systems 2E-H-W Manual de usuario Pagina 32