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Chengdu Ebyte Electronic Technology Co.,Ltd.
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 RS485 star topology
e. Pay attention to the load capacity of the RS485 bus. The factors that affect the load capacity are: the power supply
capacity of the RS485 converter connected to the serial port of the host computer, the communication distance, the
quality of the RS485 data wire, and the baud rate.
h. The passive RS485 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 RS485 network, an RS485 converter with power supply
should be used. Choose a good 485 dedicated communication cable and use the lowest baud rate as possible. The use of
RS485 repeaters or RS485 hubs can improve the load capacity of the RS485 bus.
3.3 Hardware connection of the second communication method
3.3.1 The Hardware connection and installation of the second communication
method(LoRa spread spectrum）
(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
a. 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)
b. Reason: The special frequency band antenna used for this product has good standing wave performance and more
stable data transmission.
(3) RF antenna installation
a. For transmission pair RF antennas, it should be as open as possible and as far as possible to see directly; RF antennas
should be as far away as possible: walls, metal shields, big trees, hills, large buildings, etc.
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