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AP-51
Appendix 5: Digital Interface
Digital Interface
Input sentence
ABK, ACK, DBS, DBT, DPT, DTM, GGA, GLL, GNS, HDT, MTW, MWV, NRX, RMC, ROT, THS, VBW, VDR,
VHW, VTG, ZDA, !AIVDM, !AIVDO, $AIALR
Output sentences
ABM, ALR, BBM, OSD, SSD, TLB, TTD, TTM, RSD, VSD
Data reception
Data is received in serial asynchronous form in accordance with the standard referenced in IEC 61162-2.
The following parameters are used:
Baud rate: 38,400 bps: HDT, THS, !AIVDM, !AIVDO and $AIALR. All other sentences: 4800 bps
Data bits: 8 (D7 = 0), Parity: none, Stop bits: 1
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits
Validity and integrity of input data (mode indicator)
Data
indication
HDG Latitude and Longitude SPD COG/SOG
GREEN color
(normal data)
THS-A
HDT
GNS-A,D
GGA-1 2,3
GLL-A, D and (status: A)
RMC- A, D and (status: A)
VBW-A
VHW
VTG-A, D
no indication THS-E, M, S, V
GNS-E, M, S, N
GGA-0, 4, 5, 6, 7, 8
GLL-E, M, S, N or (status:V)
RMC-E, M, S, N or (status:V)
VBW-V VTG-E, M, S, N