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Serial Interface Specifications
70 Apollo SL30 Installation Manual
“V”.................Message class. This is a VHF NAV message.
“34”................Message identifier.
vvv .................OBS Value in degrees, ranging from “000” to “359”.
Example message:
$PMRRV34310<chksm><CR><LF>
Set the OBS value to 310 degrees.
DME SENSOR INPUT
This message is used to input the range, ground speed, and ETA decoded from an external DME
sensor.
Message format:
“V”.................Message class. This is a VHF NAV message.
“41”................Message identifier.
rrrr..................Range from DME station in 1/10
th
of a nautical mile units. The first two
digits are the 10s and 1s place of the range, and the last digit is the 1/10
th
s
place. This field may range in value from 0.0 NM (“0000”) to 999.9 NM
(“9999”). If the distance from the DME station is greater than 999.9NM,
the value should be encoded as “----”.
sss...................Ground speed with respect to DME station in knots. This field may range
in value from 0 knots (“000”) to 999 knots (“999”). If the ground speed
with respect to the DME station is greater than 999 knots, the value should
be encoded as “---”.
hmm ...............Time to station in hours and minutes. This field may range in value from
0 hours and 0 minutes (“000”) to 9 hours and 59 minutes (“959”). If the
time to the station is greater than 9 hours and 59 minutes, the value should
be encoded as “---”.
Example message:
$PMRRV410983055147<chksm><CR><LF>
Range from DME station is 98.3 NM, ground speed with respect to station is 55 knots, and the
estimated time to the station is 1 hour and 47 minutes.
OUTPUT MESSAGES
RESET STATUS
This message is sent to indicate to the host that the SL30 is running and ready to accept data on
the serial port. It will be sent once upon startup and when requested by the host.
Message format:
“V”.................Message class. This is a VHF NAV message.
“20”................Message identifier.