How to send commands to gps via usb and defined as a serial port?

Question

Philip Nahmias 2018-12-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435804-how-to-send-commands-to-gps-via-usb-and-defined-as-a-serial-port

评论： ZICHENG 2020-3-4

Hello,

I am reading data from the BU-353S4 gps unit and have defined the connection as a serial/com. It receives commands in the NMEA system in order to define what outputs to give. This commands have the following format:

Enable WAAS/EGNOS - $PSRF151,01*0F
Disable WAAS/EGNOS - $PSRF151,00*0E
Enable GGA Output 1sec - $PSRF103,0,0,1,1*25
Disable GGA Output - $PSRF103,0,0,0,1*24
Enable GLL Output 1sec - $PSRF103,1,0,1,1*24
Disable GLL Output - $PSRF103,1,0,0,1*25
Enable GSA Output 5sec - $PSRF103,2,0,5,1*23
Disable GSA Output - $PSRF103,2,0,0,1*26 
Enable GSV Output 10sec - $PSRF103,3,0,10,1*16
Disable GSV Output - $PSRF103,3,0,0,1*27
Enable RMC Output 1sec - $PSRF103,4,0,1,1*21
Disable RMC Output - $PSRF103,4,0,0,1*20
Enable VTG Output 1sec - $PSRF103,5,0,1,1*20
Disable VTG Output - $PSRF103,5,0,0,1*21
Enable ZDA Output 1sec - $PSRF103,8,0,1,1*2D
Disable ZDA Output - $PSRF103,8,0,0,1*2C 

The commands start with the $ sign. How can I send any of these to the gps through MATLAB?

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ZICHENG 2020-3-4

Hello, do you have Matlab program to evaluate the performance of WAAS？

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Answer 1

Walter Roberson 2018-12-14

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https://ww2.mathworks.cn/matlabcentral/answers/435804-how-to-send-commands-to-gps-via-usb-and-defined-as-a-serial-port#answer_352436

serial(). set properties. fopen(). fprintf() to send data. fclose when done.

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Philip Nahmias 2018-12-14

Hey Walter,

first of all thank you for your response. I have tried both fprintf() and fwritef() and neither have worked. One possible reason I think may be because I cant enter a return (enter) character in the sent string and as a result the gps just ignores the sent command. Any suggestions on how I can correct that?