Manual revision 017
Appendix II: NMEA Message Simulation Program
SBE 33
49
5.
When in mode 3:
A.
Type
10
and press the Enter key to switch to mode 10. Mode 10
transmits all NMEA messages in raw form. The menu response
indicates that the SBE 33 has
diagnostic level 1 enabled
.
B.
Type
11
and press the Enter key to switch to mode 11. Mode 11
transmits NMEA messages in decoded form. The menu response
indicates that the SBE 33 has
diagnostic level 1 enabled
and
diagnostic level 2 enabled
, so NMEA messages will be transmitted in
raw form followed by decoded form.
6.
On computer 2, double click on
nmeatest.exe
(in same directory as
SBE Data Processing). The NMEATest screen appears.
7.
On the NMEATest screen, click on the Configure menu. The Configure
dialog box appears. Select:
NMEA message to be simulated (RMA, RMC, GLL, or GGA)
or
select an existing NMEA data file on your computer by clicking
Send
File
and browsing to the desired file. If selecting a NMEA data file,
the NMEA message must be compatible with the SBE 33 (GGA,
GLL, RMA, RMC, TRF, DBT, or DPT).
Baud rate for transmission of simulated NMEA data to SBE 33 (4800
or 9600) –
must match SBE 33 setup
.
COMM port on computer 2 for transmission of NMEA data to
SBE 33.
Message interval (time between simulated messages to be transmitted
to SBE 33).
Click OK.
8.
On the NMEATest screen, click Start. NMEA data should begin to
display on the NMEATest screen on computer 2 and in Seaterm on
computer 1. The yellow
NMEA transmit
light should flash each time the
simulation program transmits a new position.
The data displayed by Seaterm should correspond to that of the simulation
program (see
Appendix I: NMEA Navigation Device Message and Data
Formats
for the raw and decoded NMEA message formats). If properly
decoded data appears on the screen, the SBE 33 is working properly.
If the system works with the simulation program but does not work when
connected to the actual NMEA navigation device, the problem is with the
cable from the NMEA navigation device to the SBE 33, or in the NMEA
navigation device itself.
Verify that the cable pinouts are correct, especially at the NMEA
navigation device. See
Wiring System
in
Section 4: Mounting and Wiring
System
and also refer to the NMEA navigation device documentation.
If the cable is correct, verify that the NMEA navigation device is on and is
configured to send data. Many NMEA navigation devices have
programmable NMEA outputs and may need to be configured before they
will transmit NMEA messages. Again, refer to the NMEA navigation
device documentation, or contact the device’s manufacturer for
customer support.
