Communication method and device based on parallel system, and terminal

A communication method based on a parallel system, wherein the parallel system comprises a fieldbus and two or more communication nodes connected to the fieldbus in parallel, and the communication method comprises:

• acquiring a status parameter of a target communication node;
• converting the status parameter into a logic level signal;
• generating an input differential signal based on the logic level signal;
• sending the input differential signal to the fieldbus and synchronously receiving an output differential signal from the fieldbus, wherein the output differential signal is generated by the fieldbus by performing a wired-AND operation on input differential signals received from the two or more communication nodes;
• and
• acquiring information of the communication nodes connected to the fieldbus based on the output differential signal, wherein
• before the acquiring a status parameter of a target communication node, the communication method further comprises:
• determining whether the target communication node is a master node in the parallel system;
• and
• outputting a synchronization signal in a case that the target communication node is the master node, wherein the synchronization signal instructs the communication nodes connected to the fieldbus to synchronize signal data bits;
• and wherein
• the determining whether the target communication node is a master node in the parallel system comprises:
• sending a master-slave competition signal to the fieldbus and synchronously receiving a signal returned by the fieldbus, wherein the master-slave competition signal comprises a flag bit;
• determining that the target communication node is not the master node in the parallel system, in a case that a flag bit in the returned signal is different from the flag bit in the sent master-slave competition signal and a priority of the flag bit in the returned signal is higher than a priority of the flag bit in the sent master-slave competition signal;
• and
• determining that the target communication node is the master node in the parallel system, in a case that a flag bit in the returned signal is the same as the flag bit in the sent master-slave competition signal or in a case that a priority of a flag bit in the returned signal is not higher than a priority of the flag bit in the sent master-slave competition signal.