Full-insulating bus multipoint temperature measuring single conductor communication system

Abstract

The invention discloses a full-insulating bus multipoint temperature measuring single conductor communication system, wherein a measuring major node and all temperature measuring sub nodes adopt a single bus communication mode, a single bus works in a serial mode, and a sender simultaneously detects whether the level of the bus is consistent with that of data bit sent or not after the data is sent; if not, the sender judges that transmission fails and immediately terminates the sending state and delays to try again or carry out other processing. When the measuring major node sends the data, the level of a GPIO port is detected firstly, if the level is high level, the single bus is idle, and at the moment, all the measuring sub nodes are in receiving states. The measuring major node starts to send a start bit, then 8 data is sent and then a stop bit is sent. The measuring major node can be used for continuously reading the level of the bus in the sending process. If the level is not consistent with the sending level, current transmission is immediately terminated, and the GPIO port is set as the high level.

Description

technical field [0001] The invention relates to a single-wire communication system for multi-point temperature measurement of fully insulated busbars. Background technique [0002] In order to realize the control and data collection of all temperature measurement sub-nodes (temperature measurement sensor modules) by the main measurement node (inductive power acquisition and wireless transmission module), the main measurement node and all temperature measurement sub-nodes must be connected by wires. [0003] The number of temperature measurement sub-nodes can reach up to 40, and the gap at the bus joint is very small. Therefore, the bus method must be used to realize the connection between the measurement master node and all temperature measurement sub-nodes. Commonly used serial buses include RS-485 bus, CAN bus, Ethernet and Profibus bus, etc. All of the above buses require special bus drivers and more than 2 wires, and the communication lines are required to be twisted pai...

AI Technical Summary

Problems solved by technology

[0004] The width of the gap at the bus joint is even less than 3mm. It is difficult for multi-core wires to pass through the bus, and it is not convenient for operation and maintenance; the use of multiple single-core wires cannot meet the requirements of the above-mentioned standard serial bus for wire twisting and wire impedance.

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