When recommending a scanning module for our customer's bus validator project, we did very much internal testing. Finally, we chose to supply this EP3000 2D fixed-mount scanning module to our guest.

We did the following tests and considerations for our customer's usage scenario:

1. Anti-vibration design 

 The bus will have continuous and different intensity of shaking and vibration during traveling, so the scanner must also be able to withstand long time vibration without being affected, otherwise the components of the scanner will be prone to false soldering, poor contact, and other phenomena, resulting in failure to work properly.

2. Scanning under different light conditions

In winter, when some city buses are running, the sun has not yet risen and the buses are still dark, so the scanner must be able to accurately sense the barcode/QR code to be scanned in the dark environment. Thanks to the two IR sensors, the EP3000 can accurately sense and trigger the scanning in absolutely low light environment.

3. High and low temperature

In some cities, it can be very cold in winter and very hot in summer. At the beginning of the bus, when the air conditioning/heating equipment is not working, the temperature inside the bus is still very low or high, so the scanner must be able to operate properly in high/low temperature environments.

4. Easy to develop

Customers use RS232 to communicate and control the scanner, so the scanner's communication protocol must be simple and easy to use. At the same time in hardware, the scanner must easily be embedded into the bus device.

5. Scanning performance

The scanner must be able to scan paper QR codes and screen QR codes quickly.

6. Size

Because of the small size of the bus fare collection machine, a small scanner must be used, but not at the expense of stability and scanning performance.