Data acquisition system and method for RS485 bus
A data acquisition system, RS485 technology, applied in the field of communication, can solve the problems of limited RS485 bus topology characteristics, inability to guarantee, and the number of communication connection lines, etc., to achieve the effect of facilitating accurate location of fault points, simplifying construction wiring, and improving stability
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Embodiment 1
[0052] see again figure 1 , the host 310 includes a first transceiver state control port 360 connected to the first transceiver 330, and a second transceiver state control port 370 connected to the second transceiver 340;
[0053] The first transceiver state control port 360 is used to set the first transceiver 330 to switch between the sending state and the receiving state;
[0054] When the main link fails, the second transceiver state control port 370 is used to set the second transceiver 340 to switch between the sending state and the receiving state.
[0055] After the host 310, the first transceiver 330, the plurality of slaves 350 and the second transceiver 340 form a daisy-chain communication link, the host 310 communicates with the plurality of slaves 350 To collect data, it is necessary to detect the communication link. At this time, the host 310 preferentially sets the first transceiver 330 to the sending state through the first transceiver state control port 360 a...
Embodiment 2
[0071] refer to image 3 , the serial port 320 is also connected to the first transceiver 330 and the second transceiver 340 respectively through a double-pole double-throw switch 390, and the host 310 also includes a switch for controlling the double-pole double-throw switch 390 Control port 380;
[0072] When the serial port 320 is connected to the first transceiver 330, the first transceiver state control port 360 is used to switch the first transceiver 330 between the sending state and the receiving state;
[0073] When the main link fails, the serial port 320 is connected to the second transceiver 340, and the second transceiver state control port 370 is used to control the second transceiver 340 between the sending state and the receiving state. to switch between.
[0074] The double pole double throw switch 390 includes a fixed end and a movable end, the fixed end is connected to the serial port 320, and the movable end is used to connect with the first transceiver 33...
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