Yacht Devices YDNB-07N, User Manual, Page: 17 / 46

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VII. Description of the Settings
Note that a vertical bar (pipe) is used in the descriptions below to separate alternative setting values.
ON|OFF means, that the setting can have two different values — ON or OFF.
1. Forwarding of messages
FW_CAN1_TO_CAN2=ON|OFF
FW_CAN2_TO_CAN1=ON|OFF
Sets the default forwarding rules — defines the behaviour for messages with no corresponding
match()
filters. ON — forward, OFF — do not forward (drop).
2. Assembly of NMEA 2000 fast-packet messages
PGNS_TO_ASSEMBLY=x
x — from one to five PGN, entered as decimal or hexadecimal values, separated by commas.
NMEA 2000 Standard defines a special protocol extension for PGNs with payload overall length higher than
8 bytes (from 9 to 223 bytes) — payload is transmitted in a series of standard CAN frames, each having a
payload length from 8 to 1 byte (refer NMEA 2000 Standard, section "3.1 Fast-packet messages").
The Device can "assemble" NMEA 2000 fast-packet PGNs from the series of CAN frames and present the
whole PGN payload to the program. Messages not completely assembled will be discarded. Assembly takes a
lot of RAM though, so you can select only up to five PGNs for assembly.
Note that assembly also takes time, as Device will wait until the last CAN frame will be received before
passing the assembled PGN to the program, this will introduce a delay. Use frame-by-frame data processing
technique whenever possible (see Section IX).