(This use example builds a serial communication network through a Siemens serial communication module CP341 and a CP340 module, in which one CP341 is used as the master station, and the other two slave stations composed of CP341 and CP340 are polled through the ASCII drive protocol method. Its specific termination method and polling principle have a wide range of guiding meanings, and can be used as a Siemens serial communication module and a surface, equipment, system, etc. that support the ASCII protocol.)
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