3.9
Jumper wire configuration
QLG2 provides a great deal of flexible functionality. Configuration of the module is done by
jumper wires, of which there are quite a few on the board.
As discussed in the former section headed “Powering the board from the USB port”, you
may either solder in actual jumper wires, or pin headers and jumper pin connectors (not
supplied).
The diagram below shows the default jumper wire configuration, these are actually tinned
copper traces on the underside of the board. If you want to change any of the defaults, you
must remember to carefully cut the traces under the board, with a sharp knife, taking care
to avoid any nearby traces. This is described in the former section headed “Connecting
external LEDs”.
The jumpers fall into four categories:
1. Onboard LED enable: discussed above in section headed “Connecting external
LEDs”
2. Power from USB: discussed above in section headed: “Powering the board from the
USB port”
3. Interface configuration: discussed in following section
4. Microcontroller configuration: discussed in following section
3.10 Interface configuration
The configuration of the 6-pin interface (and indeed, the 4-pin interface on the right edge of
the board) is controlled by the jumper wire area above the 6-pin interface pin header pads.
In the default configuration (specified by the tinned copper traces jumper wires), all outputs
are 5V logic level, the RXD interface pin is not connected, and the GNSS RXD pin is
connected to the microcontroller (USB to Serial port)’s TXD pin.
QLG2 manual for firmware 1.00a
14
