Serial Receive only zeroes

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Jan De Vries
Jan De Vries 2011-10-15
In simulink, I use the serial receive block to receive data from my NMEA compass, which is sending me heading information through com1 in the following format:
$HCHDG,hhh.h.,,,,<CR><LF>
where hhh.h is the heading of the compass in degrees (eg 180.0 degrees means south).
When I open the port in Matlab and use the fscanf command, I receive strings in the format
$HCHDG,49.0,,,,
So thats working. My problem is I need the 49.0 in simulink as a number.
I tried using the serial receive block, but this only yields me zeroes, and sometimes a 44 (I guess it's the ascii code for the ',').
I use $HCHDG for heading and cr/lf as terminator, can anybody help to get the heading number?
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Walter Roberson
Walter Roberson 2011-10-15
Replied in your duplicate question http://www.mathworks.com/matlabcentral/answers/18364-reading-numeric-value-from-com-port

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