— 19 —
$GPGLL,4146.5894,N,07029.6952,W,173412.02,A*02
!AIVDM,1,1,,B,ENk`smq71h@@@@@@@@@@@@@@@@@=MeR6<7rpP00003vf400,4*5F
For example, to block processing of only GLL and VDM messages from connected equipment, use
the following configuration:
0183_RX_TYPE=BLACK
0183_RX=GLL,VDM
If the filter is of BLACK type, the Device ignores messages whose sentence formatter matches with one
of the filter list records. A WHITE filter passes only matched messages.
To prohibit transmission of any messages to connected NMEA 0183 equipment, set the filter type
to WHITE and the list to empty (the same effect as disconnect TX wires):
0183_TX_TYPE=WHITE
0183_TX=
Messages from connected NMEA 0183 equipment pass the 0183_RX filter first. Passed messages are
converted to NMEA 2000 (see Appendix D) and the resulting NMEA 2000 messages are processed with
N2K_TX filter (see the next parameter). Likewise for the reverse direction.
4. N2K_TX=x and N2K_RX=x
Where x – empty string or filter records separated by comma.
Factory setting: empty string.
You should be familiar with the NMEA 2000 Standard (which can be purchased from National Marine
Electronics Association,
www.nmea.org
) to operate with NMEA 2000 filters.
These filters actually contain pairs of 29-bit message identifiers and a mask. The identifier is compared
by processing the NMEA 2000 message identifier, and the second value (mask) defines the comparison
concerning which bits are significant.
The identifier contains a PGN (Parameter Group Number, described in NMEA 2000 Standard)
