Guide to debugging skills of RS232 communication

In the field of industrial automation and computer control, RS232 communication is one of the most common serial communication modes. When debugging equipment, if communication problems are found, how to troubleshoot them?

First, check the serial number and baud rate.

Before communication test, it is necessary to confirm whether the serial number and baud rate used are consistent. Different devices may support different baud rates. Before setting, please check the default parameters in the manual to avoid communication failure due to parameter mismatch.

Second, the use of serial debugging function

Serial debugging function is an essential tool for targeted debugging in the current environment. Many terminal programs have their own input and output windows, which can be used for input and output testing in serial communication, which is fast and convenient. You can also choose some communication debugging software, such as SecureCRT, termites, etc. For further development and debugging.

Third, check the communication protocol.

RS232 communication often needs to be combined with specific protocols, such as MODBUS and OPC. When debugging, we should first understand the protocol adopted by the equipment and the fixed data format in the protocol, and eliminate all kinds of communication problems caused by protocol problems through targeted tests.

Four, check the equipment wiring

RS232 communication needs to establish physical connection, and both communication parties must make serial connection and the link is normal, including serial line connection and equipment power supply. On the premise of ensuring all the settings are correct, it can also be tested through multiple lines to eliminate the wiring problem of the equipment.

In a word, the debugging process of RS232 communication equipment may involve many links, so we need to choose scientific methods to eliminate possible faults one by one, and finally achieve perfect communication between devices.