ASI 650 Multiplexer & DSC Messages

[Chuck - Raymarine - Moderator]

Wil,

Q1) What I do not know is whether in the configuration where the VHF is the only device attached to the AIS via NEMA at 4800 and the E80 is the only device attached to the AIS at 38400, would this still cause the potential conflict? Does the E80 take the GP sentences and repeat them into the SeaTalk network so other devices on the network would get conflicting data with other GPS data sources?
A1) E-Series Classic MFDs doe not support multiple data sources. Enabling the GNSS output of the AIS650 would cause it to transmit GPS data sentences in addition to AIS data sentences to the MFD. Should the MFD presently be interfaced to a source of GPS data, then enabling the GNSS output of the AIS650 would introduce a second source of GPS data, resulting in a conflict. The E-Series Classic MFDs will indeed bridge GPS data received via its NMEA 0183 port to SeaTalk.

Q2) Is there a way to have the AIS send out the "Output of GNSS Sentences" only via the 4800 NMEA output port (attached to the VHF only) and not on the 38400 output port (attached to the E80). If it is, then it seems to be this would be the optimal/simplest solution in my configuration.
A2. No.

Q3) What are the "performance issues" mentioned in the manual related to having "Output of GNSS Sentences" enabled? This does not make much sense to me either.
A3) The AIS650 outputs only a subset of the data items produced by a GPS sensor, hence the reason for not using it as the system's primary source of GPS data.

Should it not be desirable to install an E70196 VHF NMEA 0183 to STng Converter Kit, then the alternative would be to install a dedicated NMEA 0183 GPS Sensor to support the GPS data requirements of the VHF radio.