Extra pins RTS, CTS, DTR, DSR are available - useful to auto enter download mode
RED
TXD:
Sending end, generally expressed as its own sending end, normal
communication must be connected to the RXD of another device.
RXD:
Receiver, generally expressed as its own receiver, normal communication
must be connected to the TXD of another device. During normal
communication, its own TXD is always connected to the device's RXD!
Self-receiving
and self-transmitting: During normal communication, the RXD is
connected to the TXD of other devices, so if you want to receive the
data sent by yourself, as the name suggests, that is, you will receive
the data sent by yourself, that is, your own TXD is directly connected
to the RXD to test its own transmission and reception. Whether it is
normal or not is a quick and simple test method. When there is a
problem, first do the test to determine whether the product is faulty.
Also called loopback test.
Level logic:
TTL
level: Usually the data is expressed in binary, it is stipulated that
+5V is equivalent to logic "1", 0V is equivalent to logic "0", called
TTL signal system, it is positive logic
RS232 level: use -12V to -3V, equivalent to logic "0", +3V to +12V logic level, equivalent to logic "1", is negative logic
Product Description:
1. The main chip is CP2102. After installing the driver, a virtual serial port is generated.
2.
USB power supply, the lead-out interface includes 3.3V (<40mA), 5V,
GND, TX, RX, the signal pin level is 3.3V, positive logic
3.
On-board status indicator, transceiver indicator, the status indicator
will be always on after the driver is installed correctly, the
transceiver indicator will flash when communicating, the higher the baud
rate, the lower the brightness
4. Support baud rate from 300bps to 1Mbps
