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AP-6
APPENDIX 4 DIGITAL INTERFACE
Sentence data
Input sentences
ACK, AIQ, BBM, DSC, DSE, DTM, GBS, GGA, GLL, GNS, HDT, OSD, RMC, SSD, THS, VBW,
VSD, VTG
Output sentences
ABK, ACA, ACS, ALR, TXT, VDM, VDO
Transmission intervalABK: With each event
ACA, ACS: At RX/Switch information the region
ALR: 25 s during alarm, 2 min normally no alarm
TXT: Status is changed.VDM: At RX VHFVDO: 1 s
Load requirements as listener
Isolation: opto coupler
Input Impedance: 470 ohms
Max. Voltage: ±15 V
Threshold: 3 mA (In case of FURUNO device talker connection)
Output drive capability
Differential driver outputR=54 ohm, 1.1 V minR=60 ohm, 1.1 V minDriver short-circuit current: 250
mA max.Data transmissionData format and protocol are transmitted in serial asynchronous form
in accordance with the stan-dard referenced in 2.1 of IEC 61162-1. The first bit is a start bit and
is followed by data bits, least-significant-bit as illustrated below.
The following parameters are used:
Baud rate: 38.4 Kbps
Data bits: 8 (D7=0), parity none
Stop bits: 1
D0 D1 D2 D3 D4 D5 D6 D7
Start
bit
Stop
bit
Data bits