AppconWireless RF1276 Series Руководство - Страница 13

Просмотреть онлайн или скачать pdf Руководство для Блок управления AppconWireless RF1276 Series. AppconWireless RF1276 Series 16 страниц. Lora module

on UART rate, air rate and the size of data package). In addition, it also need consume some time to transmit

from module to terminal, but the delay time is permanent in the same condition.

2）Data flux control

Although there is a buffer zone with 256 bytes in the wireless module, when the UART rate is higher than

the air rate, there must be a problem about the data flux. It may cause to lose some data because the data

overflow from the buffer. Under this condition, it must be ensured that the average UART rate should NOT

higher than 60 percent of the air rate. For instance, the UART rate is 9600bps, the air rate is 4800bps. If

UART rate is the same as the air rate, the only way is to interval the transmitting time. If terminal transmits

100bytes to UART every time, it will take 104ms every time. (104ms/0.6)*(9600/4800) =347ms. So if the

interval time that terminal transmit 100bytes to UART should NOT less than 347ms every time, those

mentioned problems can be avoided.

3）Error control

The wireless network module has strong capability of anti-interference because of the high efficiency

checking error correction with interleaving encoding technology. However, when it is in a bad circumstance

that has strong electric interference, the data may be lost or receive some error data. User can increase the

development of the system link layer protocol. For instance, if user can increase TCP/IP slip window and

repeat transmitting functions, it will improve the reliability and ability of wireless network communication.

4) Selection of antenna

Antenna is a very important factor of the communication system. The quality of antenna impacts the

capability of communication system. So user should strictly choose the quality of antenna. Generally

speaking, it mainly contains two points: the type of antenna (size) and its electric capability. The antenna

must be matched with the frequency of communication system.

11. Order information

a) RF1276-915

RF1276

LoRa module

- 13 -

V3.0

2018-2-12