B&G H2000 Pilot *DISCONTINUED* - Manual (Page 169)

HB-0845-06 169
When input sentences containing these indicators are
decoded by the Performance Unit the status of the indicators
is checked. If an invalid status is found then all the data in
that sentence is marked as invalid when stored internally.
When output sentences are being constructed the validity of
the data for each field is checked, and if any field is found to
be invalid the invalid indicator is set in the output sentence.
If no valid data has been received for a period of 15 seconds
the corresponding B&G function will display ‘OFF’.
5.14.5 NMEA-based Data on the B&G Network
Data derived from NMEA sources is normally transmitted
on the B&G network once a second. However, in the case of
heading, if the incoming data is being rapidly updated the
network data will be sent at up to four times a second. This
allows improved performance to be obtained from the
h2000 autopilot, if fitted.
5.15 RS232 INTERFACING
The RS232C is an internationally used electrical standard
for communications between computers of all different
makes and sizes. It is widely used in personal computers to
allow the transfer of files and other information between
PC’s or from PC’s to printers. Using the RS232C interface
on the h2000 allows you to send data to an on-board PC
running B&G’s Deckman Software. This can be used, for
example, to update your polar tables.
The RS232C differs from the NMEA standard in that it only
provides the electrical specifications and not the data format
standard. Your external device will have to be programmed
to send and receive the information according to the format
of the B&G data. The remainder of this section is dedicated
to the commands and data sentences understood by the
h2000 with its RS232C port.