How does the LoRa module be properly wired to the adapter board

The level adapter board is a very important auxiliary tool for the LoRa module. It can directly convert the level of different voltage interfaces into a standard USB level. With various series of digital LoRa modules, users can connect to it more conveniently. Perform configuration and communication operations on the PC side. However, customers often make mistakes in the connection method of the level adapter board, which causes the level adapter board to not be used normally. Therefore, our company takes the LoRa6500Pro LoRa module as an example to show you how the LoRa module can be correctly connected to the level switch. Board wiring (because the pins of each LoRa module are not the same, the wiring is different).

First, let's briefly introduce the connection principle of serial communication: Generally, the serial port is composed of four wires, GND (grounding pin), TX (transmitting pin), RX (receiving pin), VCC (power supply pin).

Among them, GND is a pin that all LoRa modules must connect; TX and RX need to be cross-wired; VCC pin depends on the situation, when the power of the LoRa module is too high, the power of the USB port cannot supply the normal use of the LoRa module. When an independent power supply is required, there is no need to connect the VCC power supply pin. This is the case for the LoRa6500Pro LoRa module that will be shown below.

Preparation tools:

LoRa module LoRa6500Pro

SU108 series level adapter board (232/TTL, 485)

(TTL level adapter board)            

(485 level adapter board)

(232 level adapter board)

Wiring method (the wiring port corresponds to the different pins of the LoRa6500Pro LoRa module, each port connected by the wire is a different pin, so the order of the wires must be connected correctly, otherwise the level adapter board will not be used normally) To show the corresponding pin position of each wire more clearly, so Siwei Wireless decided to use the bare board LoRa6500Pro LoRa module to show everyone the correct wiring:

The wiring sequence and pin positions of the 232 adapter board are as follows (the wiring sequence and pin positions of TTL and 232 are the same)

The white wire corresponds to the TXD pin, the yellow wire corresponds to the RXD pin, the black wire is connected to the GND pin, the orange wire is connected to the SET pin, and the green wire is connected to the CS pin first. (Please refer to the LoRa6500Pro LoRa module specification for specific pin definition)

The wiring sequence and pin positions of the 485 adapter board are as follows:

The black wire is connected to the GND pin, the white wire is connected to the A+ pin, the yellow wire is connected to the B- pin, the orange wire is connected to the SET pin first, and the green wire is connected to the CS pin first. (Please refer to the LoRa6500Pro LoRa module specification for specific pin definition)

How to check that the level adapter board can be used normally?

When the user connects to the USB adapter board, simply short the upper shorting cap to enter the configuration mode. In this mode, the red and blue transceiver indicators of the LoRa6500Pro LoRa module will always be on and the PC software can open the port normally The setting is successful, otherwise, the connection with the level adapter board fails.