AP-2
APPENDIX 2 DIGITAL INTERFACE
I/O Sentences
Note 1: ACK and ALR sentences are available when [Mode] in the [Alert] menu is set to
[Alert I/F 1].
Note 2: ACM, ACN, ALC, ALF, ARC and HBT sentences are available when [Mode] in the [Alert]
menu is set to [Alert I/F 2].
• Input sentences
ACM, ACK, ACN, GGA, GLL, HBT, RMA, RMC, VTG, ZDA
• Output sentences
ALC, ALF, ALR, ARC, DBK, DBS, DBT*
2
, DPT, HBT, Pfec SDmsi*
1
*1: Mandatory, for multiple (more than one) transducer installation.
*2: Only please use if transducer and keel same level.
• Transmission interval
1 s for any sentence other than ALC, ARC and HBT (At 30 seconds interval for ALC, at 50 sec-
onds interval for HBT)
Note: ALF, ARC and ALR are transmitted when occurs events. For ALR, it can be transmitted
at 30 seconds interval.
• Data transmission
Data is 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: 4800
• Data bits: 8 (D7 = 0), parity none
• Stop bits: 1
Data sentences: Input
Data format is IEC 61162-1 Edition 4 unless noted otherwise.
ACM/ACN: Alert command
D0 D1 D2 D3 D4 D5 D6 D7
Start bit
Stop bit
Data bits
$**ACN,hhmmss.ss,aaa,x.x,x.x,c,a*hh<CR><LF>
1 2 3 4 5 6
1. No use
2. Manufacturer mnemonic code (3 digit alphanumeric code), null
3. Alert identifier (0 to 999999)
4. No use
5. Alert command (A=ACK from ext. equipment, Q=Request from ext.
equipment, O=Responsibility transfer, S=Silence from ext. equipment)
6. Sentence status flag (C should not be null field. Sentence without C
is not a command.)
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