RoyalTek rgm-3000 用户手册

 

15 

 Data Format 

Message ID 

$GPRMC 

   

RMC protocol header 

UTC Position 

161229.487   

hhmmss.sss 

Status 

A 

 

A=data valid or V=data not valid 

Latitude 3723.2475 

 

ddmm.mmmm 

N/S Indicator 

N 

 

N=north or S=south 

Longitude 12158.3416 

 

dddmm.mmmm 

E/W Indicator 

W 

 

E=east or W=west 

Speed Over Ground 

0.13 

knots 

 

Course Over Ground 

309.62 

degrees 

True 

Date 120598 

 

ddmmyy 

Magnetic Variation 

 

degrees 

E=east or W=west 

Checksum *10 

 

 

＜

CR＞＜LF＞ 

 

 

End of message termination 

Table 7 contains the values of the following   

example:$GPVTG, 309.62, T,    , M, 0.13, N, 

0.2, K*6E 

VTG Data Format 

Message ID 

$GPVTG 

 

VTG protocol header 

Course 309.62 

degrees 

Measured 

heading 

Reference T 

 

True 

Course  

degrees 

Measured 

heading 

Reference M 

 

Magnetic 

Speed 

0.13 

knots 

Measured horizontal speed 

Units N 

 

Knots 

Speed 

0.2 

km/hr 

Measured horizontal speed 

Units   

K 

 

Kilometer per hour 

Checksum *6E 

 

 

＜

CR＞＜LF＞ 

 

 

End of message termination 

NMEA input messages allow you to control 

the Evaluation Unit in NMEA protocol mode. 

The Evaluation Unit may be put into NMEA 

mode by sending the SiRF Binary protocol 

message “ Switch To NMEA Protocol – 

Message I.D.129 ” on page 17 using a user 

program or using SiRFdemo.exe and 

selecting Switch to NMEA Protocol from the 

Action manual. If the receiver is in SiRF 

Binary mode, all the NMEA input messages 

are ignored. Once the receiver is put into 

NMEA mode, the following messages may 

be used to command the module. 

 

Transport Message       

$PSRF<MID>1 Data2 *CKSUM3 <CR><LF>4 

 

1

Message Identifier consists of three 

numeric characters . Input messages begin 

at MID 100. 

2

Message specific data. Refer to a specific