T&T: Interfacing autopilot and chartplotter

[Lewis Boone]

I am unable to get my navico auto pilot PH 8000 to respond to commands
issued from a R70RC Raymarine chart plotter. The auto pilot
understands the commands from a navigation program on a laptop e.g.
$ECBWC,183107,4420.66,N,07600.81,W,130.81,T,144.65,M,0.971,N,002*32
$ECBWR,183107,4420.66,N,07600.81,W,130.81,T,144.65,M,0.971,N,002*23

A sample from the chart plotter using hyper terminal

$ECBWC,211611,4421.01,N,07600.90,W,112.5,T,126.0,M,0.72,N,GOTO CURSOR,D*68
 $ECBWR,211611,4421.01,N,07600.90,W,112.5,T,126.0,M,0.72,N,GOTO CURSOR,D*79

>From what I can see the sentence structures are identical, Why does it
understand NMEA data from a laptop and not similar data from the chart
plotter? Could there be different line feed or carriage return
characters, maybe different voltages? Could feeding the data through a
multiplexer solve the problem. I have tried everything I can thing of
with no success, Does anyone have any suggestions.

Thanks



-- 
Lewis Boone
265 Poulin Ave #1705
Ottawa, Ontario
K2B 7Y8
LewisGBoone@gmail.com