RF-Star RF-43UP - Page 26

RF-43UP
www.szrfstar.com V1.3 - Jan., 2020
Shenzhen RF-star Technology Co., Ltd. Page 25 of 34
⚫ Serial parity bit is 8N1, and the binary representation is [00].
⚫ Baud rate is 19200, and the binary representation is [100]
⚫ Air rate is 19.2k, and the binary representation is [101]
All in all, it is [0010 0101], and converted to hexadecimal is [25]. The first four commands can be expressed as: [AT_SET
= 03,E8,25]
4. The fourth group of data represents the channel.
The channel range is 410 MHz ~ 525 MHz with 1 M interval. Channel 23 in decimal is [17] in hex, corresponding to
(410+ channels) MHz = 433 MHz. Channel 60 in decimal is [3C] in hex, corresponding to (410+ channels) MHz = 470
MHz.
The first five commands can be expressed as: [AT_SET = A0,03,E8,25,17]
5. The fifth group of data represents: transmission mode, IO driving method, wireless wake-up time, transmit
power.
The specific understanding is as follows: [40] is a hexadecimal representation, it needed to be converted to a binary
representation, that is, [0100 0000].
bit7 indicates the transmission mode
bit7
Transmission Mode
Description
0
Transparent transmission
When it is 1, the first three bytes of each user's data frame are used as
high, low address and channel. When transmitting, the module changes
its address and channel, and then restores the original settings after
completed.
1
Fixed point transmission
bit6 indicates the IO driven mode
bit6
IO Driven Mode (default as 1)
Description
0
TXD, EN open circuit output,
RXD open circuit input
This bit is used to enable the internal pull-up resistor of the module.
Open-drain mode has stronger level adaptability. In some cases, an
external pull-up resistor may be required.
1
TXD, EN push-pull output, RXD
pull-up input
bit5, bit4 and bit3 indicates the wireless wake-up time
bit3
bit2
bit1
Wake-up Time (ms)
Description
0
0
0
250 (by default)
The transceiver modules work in normal mode. The delay time is invalid
and can be any value.
0
0
1
500