Cavli Wireless C100QM/C10QM Hardware Manual
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attention to the protection of the data line, differential trace, control impedance is
90Ω.
✧
In order to improve the antistatic performance of the USB interface, it is
recommended to add an ESD protection device on the data line. The equivalent
capacitance of the protection device is less than 2pF.
✧
The USB interface bus supply voltage is provided internally by the module and does
not need to be externally supplied. At the same time, since the USB interface of the
module does not provide USB bus power, the module can only be used as a slave
device of the USB bus device.
The USB interface supports the following features:
✧
Software download upgrade
✧
Data communication
✧
AT Command
✧
GNSS NMEA output, etc.
3.6 UART interface
3.6.1 Main serial port
The C100QM/C10QM module provides two sets of UART interfaces. Main serial port and
debug serial port, the serial port level is 1.8V.
Main serial port:
The serial port can realize AT interactive instructions, print program log information,
and interact with peripheral data.
The module's serial port baud rate can be set to 4800, 9600, 19200, 38400, 57600,
115200, 230400, 460800, 921600bps baud rate, the default is 115200bps.