Page 19 of 32
Open connects the GPS COM2 to the serial connector CN6 for connection to external
devices.
JP8 3-4 Jumper – Default Closed
Closed selects normal baud clock. The UART clock for both UARTS is set to the PC
standard 1.8432 MHz. The highest baud rate possible is 115.2K baud.
Open selects high speed baud clock. This 14.7456 MHz UART clock will enable high
speed baud clocks. The highest baud rate possible is 921.6K baud. This jumper also
puts the serial port on CN6 into RS-422/485 mode. With this setting, baud rate divisors
will be 8 times larger for the same baud rate. For example, in normal mode 9600 baud
has a baud rate divisor of 12. In high speed mode 9600 baud has a baud rate divisor of
96.
DIO Pullup/Pulldown Configuration (Default: JP1 & JP2 2-3 =
closed)
JP1 Jumper – Default 2-3
2-3 closed selects a 10 Kohm pulldown on digital I/O DIO8 – DIO15. 1-2 closed selects a
10 Kohm pullup on digital I/O DIO9 – DIO16.
JP2 Jumper – Default 2-3
2-3 closed selects a 10 Kohm pulldown on digital I/O DIO1 – DIO8. 1-2 closed selects a
10 Kohm pullup on digital I/O DIO1 – DIO8.
Active Antenna Supply
The antenna connector supplies up to 100 ma of 4.75 - 5.10 volts for active GPS antennas.
