Provide optional cards for CAN, RS232, RS485, and RTC

The controller achieves multi scenario application and cost savings by selecting specific functional optional cards

CAN: CAN optional card, used to expand one CAN communication channel

RS232: 2-channel RS232 optional card, can be used as a master or slave station separately

RS485: 2-channel RS485 optional card, can be used as a master or slave station separately

RTC: Perpetual Calendar Battery Card (After the controller is powered off, the perpetual calendar time can continue to count)

Detailed fault diagnosis, quick positioning and analysis of problem causes