Sensors & Software LMX200 Series, User Manual

Page: 21 / 133

Assembly
21
If you choose to connect a 3
rd
party GPS receiver, it must meet the following criteria:
•
Be able to communicate over RS232 with a standard 9-pin serial output cable
•
Output a NMEA GGA string in ASCII format, at a rate no faster than 20 Hz
•
Set the following parameters:
- Baud rate = 19200 bps
- Parity = None
- Stop Bits = 1
- Data Bits = 8
•
If it cannot safely accept power via the serial port (as shown below), it must have
its own battery or way of receiving power.
•
GPS must not expect any handshaking from the Display Unit
NOTE : Since the serial port of the Display Unit outputs power (current=1A, voltage=12V), it is
the responsibility of the user to confirm with the 3
rd
party GPS manufacturer that the serial cable
does not provide power to the GPS or that the GPS will accept 12V power from our serial cable
on the pins shown below. Sensors & Software is not responsible for damage caused to a GPS
from using the serial port.
See Section 4.2.7 to enable or disable power to the serial port.