NMEA 0183 Issues
Begin with a Problem Statement
Basic configuration without enough interconnection points and with single points of failure
Some Challenges of Device Interconnection
What is the solution when you have more devices that need GPS input than you have GPS sources?
What is the solution when you have devices that need GPS and fathometer input, but one GPS or one autopilot fails?
To Err is Human, to Really Confuse Things takes a Computer
What does Windows think is on a port?
How do you connect multiple sensors (e.g., GPS and fathometer) to a single computer port?
Building Blocks of NMEA 0183 Solutions
Expanders: take 1 NMEA talker output and fan it out into multiple outputs
Expander/switches: Take 2
NMEA talker outputs, and use the preferred one only if the backup is
active, fanning out to several outputs. If the preferred output fails,
use the backup as source
Multiplexers: take multiple NMEA talkers and concentrate it into one output (see USB example)