In the following description, the nomenclature
adopted is – as illustrated in the diagram
(right):
UPPER: means the jumper wire is connected
from the center of the group of three pads, to
the top pad.
LOWER: means the jumper wire is connected
from the center of the group of three pads, to the lower pad.
1. PPS voltage level:
UPPER: 5V logic level (DEFAULT)
LOWER: 2.8V logic level
2. SER voltage level
(GNSS module serial data output, which is the TXD pin on the 4-pin
header at the right of the board):
UPPER: 5V logic level (DEFAULT)
LOWER: 2.8V logic level
3. TXD voltage level
(the USB to Serial converter transmit output pin):
UPPER: 2.8V logic level
LOWER: 5V logic level (DEFAULT)
4. RXD source
(where the USB to Serial converter receive signal is connected to):
UPPER: Receive signal is connected to the GNSS Serial data output (DEFAULT)
LOWER: Receive signal is connected to the RXD pin for external use
5. GNSS RXD source
(where the GNSS receive signal is connected to):
UPPER: GNSS RXD is connected to the USB to Serial converter transmit signal
(DEFAULT)
LOWER: GNSS RXD is connected to the RXD pin for external use
6. JP4
is not used currently
NOTE:
External RXD pin may be 2.8V, 3.3V or 5V logic and is automatically converted.
QLG2 manual for firmware 1.00a
15
