Industrial sites often require both isolated RS-232 and isolated RS-485. The conventional solution is to design with two isolated DC-DCs with separate signal isolation circuits. ZLG's MPM module integrates RS-232 and RS-485 interfaces, and the power supply, RS-232, and RS-485 are isolated from each other, simplifying similar applications. The following is an example of a communication management machine.
I. Brief description of the interface circuit of the communication management machineThe communication management machine can collect data of multiple subsystems in the power system, and complete data interaction in the power system through centralized processing and receipt. Externally, it is necessary to integrate multiple RS-232, RS-485, CAN, and Ethernet interfaces.
Figure 1 Communication Manager Application Topology
The communication management machine has high requirements on the interface resources of the embedded main control CPU, and it is often necessary to expand the communication interface by various means. At the same time, the working environment of the power communication device is relatively complicated, and there is a rigid requirement for isolation and anti-interference performance. However, according to the conventional design scheme, the interface isolation circuit designed by discrete isolated DC-DC, signal isolation, transceiver, protection circuit, etc. occupies a large PCB area, and there are many kinds of material procurement, and it is not convenient to separately test the performance of the communication interface. .
Figure 2 Common communication management machine
Second, the combination of MPM features and communication management machineZLG Zhiyuan's MPM series modules creatively combine the commonly used RS-232 and RS-485, combined with the application of the communication management machine, the additional advantages are mainly as follows:
Some details of the MPM's electrical parameters are as follows:
Figure 3 MPM module selection table
Third, the application of MPM to RS-232 to RS-485Because MPM's RS-485 supports automatic flow control, it means that only TXD and RXD are needed to complete RS-485 communication. Therefore, the MPM product RS-232 and RS-485 UART port cross-connect, that is, support RS-232 to RS-485, while RS-232 and RS-485 also have complete electrical isolation, for debugging serial port, Applications such as isolated bus interference are very convenient, as shown below.
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