SPEED DIRECTION (CD401EB/CD401DB ONLY)
CD401EB and CD401DB are speed log displays developed for vessels going in
both directions, like ferry boats.
On these systems the NMEA signal out to repeaters are reversable. The wanted
speed direction can be switched by connecting the DIMUP-input to Vcc and
connect a switch between the DIMCOM-input and ground. The screen will
show the same direction but NMEA VBW will change polarity. The NMEA output
sentence VMXDR is used to indicate the speed direction for the CD401EB/
CD401DB system. The VMXDR NMEA output sentence is sent if the VMVBW
NMEA sentence output is enabled.
Note: Only multi repeater should be used in this mode. These read the XDR
message and rotate the axis when requred.
If DIMCOM is left open the VMXDR output will be (backward direction):
$VMXDR,A,180,D,SPDD*hh<CR><LF>
If DIMCOM is grounded the VMXDR output will be (forward direction):
$VMXDR,A,0,D,SPDD*hh<CR><LF>
A small arrow symbol is used in front of the STW text on the screen to indicate
the congured vessel direction.
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