6-38
The NMEA messages are routed according to the following default NMEA talkers list if the
NMEAfilterT_rev.txt filter-file is in use. The following table is stored in the filter-file.
NMEA listeners Transmitted messa
es are startin
with
SPEED + DEPTH VDVBW; VDVLW; ##DPT; ??ALR; PSALL; VDHBT; VDALF;
VDALC; VDARC
SPD AVERAGE +DPT
VBW; VDVLW; ##DPT; ??ALR;
ALL
SD4 DUAL LOG VDVBW; PSALS,5; PSALS,6; PSALS,9; PSALc; PSALR,,;
PSALU,1; SDSTN
SD4 MASTER VDVBW; VDVLW; ??DPT; VDALR; PSALS,5; PSALS,6;
PSALS,9; ??ROT; PSALL; PSALR,,, PSALW; SDSTN
SD4 INVERTED @@VBW; VDVLW; ##DPT; ??ROT; @@ALL; PSALR;
SDSTN
SD4 VDVBW; VDVLW; ##DPT; ??ROT; PSALL; PSALR; SDSTN
LOG 1 PSALS,0; PSALS,1,; PSALS,1?,; PSALS,10; PSALC; VDACK
LOG 2 PSALS,0; PSALS,1,; PSALS,1?,; PSALS,10; PSALC; VDACK
ESD VDDPT; SDACK; PSALX; VDVBW; PSALW; G??; SDSTN
VDR VDVBW; VDVLW; ##DPT; ??ALR; PSALc; SDSTN
MFD VD; ??ROT; PSALL
GPS G??
OTHER Not
et implemented
Table 5 NMEA listeners
## Transmit VDDPT instead of SDDPT if no valid SDDPT for 10 sec.
@@ Modified data output. Averaged speed according to time constant in menu S15,
or negative (inverted) speed for a SD4 INVERTED nmea output channel.
?? The question mark
“?” is used as a wildcard and can be replaced by any
character.
6.1 SD4 INVERTED
If an NMEA output channel is set to be an SD4 INVERTED listener, all VBW and PSALL
messages on that channel will have inverted signs of the speed and direction information fields.
This is useful for DAT (Double Acting Tankers) and double-ended ferries. For example, an
SD4-3 display on that channel will show 5 kn in the vessel’s astern direction instead of 5 kn in
the vessel’s ahead direction, and an SD4-5 Docking Display will show 1 kn starboard at the
bow instead of 1 kn port at the stern.
It is possible to deactivate the SD4 INVERTED function by using an OPTO input. See section
5.2.3 Menu I, Inputs.
Note! The SD4-2 Main Display transverse speed window only reads the “bow speed” field in
the NMEA sentence. Therefore, the docking log functionality has to be activated in order to get
the correct data in a transverse speed window of the SD4 INVERTED.
If there is a rot-gyro NMEA input to the Sig. Distributor, enter the following in the menu
system:
x S2 DL GYRO INPUT = NMEA
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