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When programming normal COM port communication, it is generally necessary to judge the communication status of the COM port, so that data can be sent normally when the data enable signal is valid, and data can be received normally when the data enable signal is valid. This is what we usually call the "RTS" communication method. In order to facilitate programming and improve the execution speed of the program, ordinary users directly identify the communication status of the COM port when designing hardware, and no longer query the sending and receiving status when programming. This is the "AUTO" communication method. Considering the versatility, usually, the COM ports on the motherboard are all "RTS" communication methods, so when you use it for RS-485 communication, due to the difference in the above communication methods, there will be a phenomenon of "can send but not receive, or can receive but not send". The simplest solution is to use the EVOC product ARK-14520 (RS232 to RS485 module), but if it is communication between the COM ports on the motherboard, there will generally be no such problem.

1. The CPU frequency sometimes automatically decreases. This may be because the CMOS battery has been used for a long time and the voltage has decreased. Replace the CMOS battery.

2. Entering the self-protection state, the system crashes

(1) The fan may not be installed; (2) The fan may be installed upside down; (3) The CPU fan is not well lubricated, causing the fan blades to rotate slowly and lose the heat dissipation function.

CPU maintenance: (1) Heat dissipation is the top priority; (2) Pressure reduction and shock absorption; (3) Do not use overclock; (4) Dust removal, use silicone grease and other methods.

This type of problem is rare in newly installed computers, but common in computers that have been used for a period of time. It is usually caused by frequent plugging and unplugging of PCI or ISA cards, unstable fixation, poor dust prevention measures, etc., which lead to poor slot contact. You can solve the problem by repeatedly plugging and unplugging the card several times or changing the slot.