P-6
Digital Interface
Sentence data
Input sentences
ACK, AIQ, BBM, DSC, DSE, DTM, GBS, GGA, GLL, GNS, HDT, OSD, RMC, SSD, VBW,
VSD, VTG
Output sentences
ABK, ACA, ACS, ALR, TXT, VDM, VDO
Transmission interval
ABK: With each event
ACA, ACS: At RX/Switch information ion the region
ALR: 25 s during alarm, 2 min normally no alarm
TXT: Status is changed.
VDM: At RX VHF
VDO: 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 output
R=54 ohm 1.1 v min.
R=60 ohm 1.1 V min.
Driver short-circuit current
250 mA max.
Data transmission
Data format and protocol are transmitted in serial asynchronous form in accordance with
the standard 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 /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
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