Appendix B - Serial Interface SpecificationsB-16 560-0982-01 Rev L GNS 480 (CNX80) Installation ManualExample message:$PMRRV2331><Identifier is “31 ”, indicating a runway, and the localizer frequency is 110.300 MHz.B.2.1.4.6Distance/Speed/Time MessageIf an SL30 is connected to the GNS 480, the GNS 480 will send the following message to the SL30.$PMRRV41rrrrssshmmrrrr is the distance to the station in 0.1nm unitssss is the ground speed in knotshmm is the time to the station in hours and minutesThis message is used to output the range, ground speed, and ETA decoded from an external RNAV sensor(DME or GPS).Message format:“V”............ Message class. This is a VHF NAV message.“41”........... Message identifier.rrrr............. Range from DME station in 1/10th of a nautical mile units. The first two digits are the 10sand 1s place of the range, and the last digit is the 1/10ths place. This field may range invalue from 0.0 NM (“0000”) to 999.9 NM (“9999”). If the distance from the DME stationis 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 0knots (“000”) to 999 knots (“999”). If the ground speed with respect to the DME stationis 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 0minutes (“000”) to 9 hours and 59 minutes (“959”). If the time to the station is greaterthan 9 hours and 59 minutes, the value should be encoded as “---”.Example message:$PMRRV410983055147Range from DME station is 98.3 NM, ground speed with respect to station is 55 knots, and theestimated time to the station is 1 hour and 47 minutes.
