I'm not sure if this is useful now but at least the info is all in one place, I found an English explanation from a Chinese seller who seems to know what he's talking about -
# Arduino driver for nRF24L01 2.4GHz Wireless Transceiver
Description:
USB wireless serial data transmission module, support AT commands
With a stable CH340T do USB to serial
Built-in anti-crash watchdog procedures, under the harsh environment of industrial control occasions.
With this module you can do wireless serial transmission distance farther (100 ~ 1100m, depending on the use of the wireless module), far higher than Bluetooth (10m) serial transmission distance
Parameters and commands:
1. The number of bytes in a single transmission valid: 1-31 bytes.
The first 0 byte system reserved for each transmitted packet length statistics; for example serial port to send "123" (ASCII code, 3 bytes), the actual transfer when the first byte 0 to 3, the receiving end of the actual should be handled to determine the packet length byte received under this number.
2. Module Baud Rate: 4800,9600,14400,19200,38400,57600,115200.
Covers common baud rate, (factory default 9600)
Baud rate modification command: send ASCII code [AT + BAUD = x] (x is 1,2,3,4,5,6,7 4800,9600,14400,19200,38400,115200 the corresponding baud)
Such as: Modify the baud rate to 115200, the serial debugging assistant sending ASCII [AT + BAUD = 7], the system replies:
Baud rate setting success !!
Baud Rate: 115200
At this baud rate of 115200, serial debugging assistant need to switch to 115 200 to communicate with the module.
Note: The command must be in uppercase letters!
3.NRF24L01 module transmission rate: 1Mbps, 2Mbps (factory default 1Mbps)
Transmission rate setting command: send ASCII code [AT + RATE = x] (x 1,2 respectively 1Mbps, the transmission rate of 2Mbps)
Such as: modify the transmission rate of 2Mbps, then sending ASCII serial debugging assistant [AT + RATE = 2], the system replies:
Transmission rate setting success !!
Transmit power: 0dBm
Transfer rate: 2Mbps
Low-noise amplifier gain: open
4, NRF24L01 module address setting: 5 address, local address and the receiver address matches 0 (factory default 0xFF, 0xFF, 0xFF, 0xFF, 0xFF)
Address Set command: Send ASCII code [AT + ADD = 0x ??, 0x ??, 0x ??, 0x ??, 0x ??] (0x ?? address you want to set a comma, the comma must be in English half-width )
Such as: change the address for 0x11,0x22,0x33,0x44,0x55, then sending ASCII serial debugging assistant [AT + ADD = 0x11,0x22,0x33,0x44,0x55], the system replies:
Address Setting Success !!
Local Address: 0x11,0x22,0x33,0x44,0x55
Receiving end address 0: 0x11,0x22,0x33,0x44,0x55
5, System Information inquiry:
Query: sending ASCII [AT?], The system replies:
AT?
System Information:
Baud Rate: 115200
Local Address: 0x11,0x22,0x33,0x44,0x55
Receiving end address 0: 0x11,0x22,0x33,0x44,0x55
Transmit power: 0dBm
Transfer rate: 2Mbps
Low-noise amplifier gain: open
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I thought a pair of these might be useful for using with quasi pro-weather stations which have a USB output to PC connection used to chart the data and to upload to the wunderground.com weather website. The idea being to allow the flashy Weatherstation unit to be placed anywhere within the house and communicate to the PC somewhere else. Not sure about the CH340 interface though, may have to have a Nano or something on the WS side and power of course - tests will tell.