Shenzhen KYL Communication Equipment Co., Ltd
Fax: +86-755-83408785 [email protected] www.rf-data.com
8
2400
48
19200
10
4800
30
Timing diagram:
c. Error dealing procedure:
To enhance the reliability and stability of user’s systems, a verified bit or a
Cyclic Redundancy Check (CRC) mode is highly recommended to resist wrong
information while using KYL-500L modules.
d. Large-number data transmission
In theory, when the interface data rate is faster than the RF data rate, KYL-500L
transceivers can sent unlimited-long data package, but any long packages more
than 120B are not recommended. The length of each package should be between
60~100B. We also recommend users to resist the wrong information by using
Automatic Error Request Equipment (ARQ).
Reasons:
If the actual transmission BER (Bit Error Rate) is 10
-4
, 1 packet with 1KB data,
which is about 10-thousand bits, is sent, theoretically, at least 1 bit will be
received wrongly. So the 1KB information will never be received correctly.
But if we package the data into 10 packets with 100B for each, when all 10
packets are sent, there will be only 1 packet wrong according to this probability.
After that, it will resend this wrong packet using ARQ mode. So resending one
more packet and the efficiency rate is reduced 10%, all data will be absolutely
received correctly.
10. Antenna configuration:
Many appropriative antennas for low power RF modules are selected to meet
different users’ antenna configurations. Please ask our Sales for further
information about the antenna’s dimension and performance.
a.
Helical SMA antennas
KYL-ANT-433-10-SMA: 100mm helical SMA antennas with high gain and low
cost, reach a long distance.