Rechargeable Bluetooth to 485 communication test box

BLE-SER_CH9140 Bluetooth←→ serial port module creates a virtual serial port directly on the computer, which is basically the same as the ordinary serial port. WeChat applet and mobile APP can also link to the Bluetooth module for serial port testing.

BLE-SER_CH9140 Bluetooth ←→ RS485 module creates a virtual serial port directly on the computer, which is basically the same as ordinary RS485 (serial port to 485). WeChat applet and mobile APP can also link to the Bluetooth module for RS485 testing.

Measured charging current 5V/0.109A

The measured charging current is 5V/330mA, and the chip temperature rise is less than 30℃.

The battery uses the long-collected Laowang 450mA 3.7V lithium battery (upgraded on the basis of the 200mA Bluetooth to serial port). In order to stabilize the output voltage of 3.3, the discharge is from 4.2 to 3.3

Current not connected after power on: 9mA

Power-on connection current: 10mA

Current when sending when turned on: 12mA

Can output 3.3V for external debugging

40 hours of continuous use when fully charged (full discharge to 3.3V)

The connection distance of mobile phones is long, and the connection distance of laptops is also acceptable. Desktop computers only have a connection range of about ten meters using a Bluetooth adapter worth more than 20 yuan.

The measured serial port software communication is normal. Since ModScan has a request before each read instruction, there is a high probability of packet loss and the instruction is not issued. Modbus reading tools and debugging wizards can communicate smoothly.

The front of the real thing (the first version of Bluetooth is copper-filled, and the second version has been modified)

The reverse side of the object

PC software screenshots