Skipper DL2 User Manual

Page 42 of 60
2018-05-28
Installation DL2 Doppler Speed Log System
transmit) ALF messaging
The DL2 alarms are classed as category B, and can use the full prototcol of INS alarming.
At time of print ALF is the most modern and recommended standard for alarming. (IEC61924-2 and its
corregendum 1) This alarm method should not be used at the same time as ALR.
ALF message works in conjunction with ACN, HBT, and ALC is dened
$VDALF ALF message from VD (=Velocity Doppler)
x Total number of ALF sentences (1)
x Sentence number (1)
x Sequential message identier (1)
hhmmss.ss Time of alarm condition change, UTC (if available)
a Alert category (B)
a Alert priority, E A W or C (A)
a Alert state A,S,N,O,U or V
V= Active unacknowledged (Like ALR A,V)
S= Silenced
A=Active acknowledged (Like ALR A,A)
O = Responsibility transfered
U = Rectied unacknowedged (Like ALR V,V,...)
N = Normal (like ALR V,V with no ID)
aaa Manufacturer mnemonic code (SKP)
x..x alart identier
x..x alert instance 1-999999”
xx Revision counter 1-99
x Escalation counter 1-9
c--c Alert text (see list of alarm types)
hh Checksum
<CR><LF> Carriage return and line feed (Normally not visible)
example
$VDALF,1,1,0,124304.50,B,W,V,10234,SKP,1,1,SOG Speed Hi*hh
(received) ACN Acknowledgement (works if ALF is activated)
$_ _ ACN ACN acknowledge header
Time of aalert command UTC (if available)
aaa Manuafacturer Mnemonic (as in alarm types table)
x..x Alert identier
x..x Alert instance
c Alert command A,Q,O,S
A= Acknowledge
Q= Request to repeat ALF
O= responsibility transfer
S= silence
a Sentence status ag
hh Checksum
< CR><LF> Carriage return and line feed
Example
$IIACN,124305.50,10234,SKP,A,A*hh

Skipper DL2 Specifications

General

Brand	Skipper
Model	DL2
Category	Marine GPS System
Language	English