Hardware Connection Of The Second Communication Method - Ebyte K62-DL20 User Manual

Chengdu Ebyte Electronic Technology Co.,Ltd. K62-DL20 User Manual
connections. By using 485 hubs or 485 repeaters flexibly, the bus topology can be connected into a star or tree topology.
It greatly facilitates the pre-construction and post-maintenance work.
Figure 3-2 485 star topology
5. Pay attention to the load capacity of the 485 bus. The factors that affect the load capacity include: the power supply
capacity of the 485 converter connected to the serial port of the host computer , the communication distance, the quality
of the 485 data wire, and the baud rate.
6. The passive 485 converter steals electricity from the serial port of the computer, the power supply is poor, and the load
capacity is insufficient. If there are many devices on the 485 network, a 485 converter with a power supply should be
used. Choose a good 485 dedicated communication cable and use the lowest baud rate as possible. Using 485 repeaters or
485 hubs can improve the load capacity of the 485 bus.

3.3 Hardware connection of the second communication method

The second communication method is: LoRa spread spectrum hardware connection and installation
(1) RF antenna connection, installation and instructions
The connection method of the product antenna: see the " Product connection antenna and power supply " section above.
(2) What antenna should be used for wireless communication
1. When the user chooses the antenna, the antenna frequency band should match the wireless operating frequency and
impedance requirements of the product. (For parameter details, see the " Basic Parameters " chapter)
2. Reason: The special frequency band antenna used for this product has good standing wave performance and more
stable data transmission.
(3) RF antenna installation
RF antennas of the transmission pair need to be as open as possible and can be viewed directly; the RF antennas should
be as far away as possible: walls, metal shields, big trees, hills, large buildings, etc.
2. The radio frequency antenna should not be close to objects that have a great attenuation effect on radio frequency,
such as metal, walls, ground, trees, sea water, etc., so as not to affect the transmission of radio frequency signals.
3. When the suction cup antenna is installed, the wire should be as straight as possible, and the suction cup base should
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