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Jumpers
The following sections describe the jumper configuration options available on the GPS6185HR.
For a reference that shows the location of each set of jumpers, refer to the diagram of the
GPS6185HR at the beginning of this chapter. The default factory jumper settings are listed in the
following table:
Jumper Description
Default Factory Setting
GPS Base Address Jumpers
Set to 3E8h (COM3:)
COM Base Address Jumpers
Set to 2E8h (COM4:)
GPS IRQ Jumpers
IRQ 5 and G jumper closed
COM IRQ Jumpers
IRQ 10 and G jumper closed
GPS Configuration Jumper JP8 1-2
Closed, GPS COM2 to UART
GPS Configuration Jumper JP8 3-4
Closed, PC compatible baud clock
DIO Pullup/Pulldown JP1 and JP2
Pulldown
RS-422/485 Termination JP3
Open
GPS or COM Base Address Jumpers (Default: GPS = 3E8h, COM
= 2E8h)
The base address selection jumpers (A3 through A8) allow you to set the base address of the first
UART that connects to the GPS module COM1 and the second UART that connects to the GPS
COM2. Any software that accesses the board will do so through reads and writes to the I/O
address set by the jumpers. To function properly, the I/O address the software is expecting must
match the base address set by the jumpers.
As shown in the figure below, A3 is located at the left end of the jumper block, while A8 is located
at the right end:
The table on the following pages shows the possible base address settings for the GPS6185HR.
All base addresses are in hexadecimal. An ‘X’ indicates a closed jumper, while an empty cell
indicates an open jumper.
Jumpers
Base Address
(Hexadecimal)
A8
A7
A6
A5
A4
A3
200
208
X
210
X
218
X
X
220
X
228
X X
230
X
X
238
X
X
X
