Line detection device of serial interface and electronic equipment

Abstract

The invention provides a line detection device of a serial interface and electronic equipment. A first output terminal of a shunt is used for inputting a voltage signal which is received by the inputterminal and is less than or equal to 0 into a detection circuit; a second output terminal of the shunt is used for outputting a voltage signal which is received by the input terminal and is greater than 0 to an error correction circuit; a detection circuit is used for outputting a voltage signal with the voltage of 0 when the voltage signal is smaller than 0 and outputting a voltage signal of which the voltage is greater than 0 when the voltage signal is equal to 0; an error correction circuit is used for triggering a first switch to be connected and grounded when the voltage signal is greater than 0; a voltage output terminal is used for outputting a voltage signal greater than 0 when the error correction circuit is grounded or the voltage signal output by the detection circuit is equalto 0 and outputting a voltage signal equal to 0 when the voltage signal output by the detection circuit is greater than 0. The voltage output by the voltage output terminal does not need to be processed through software, the state of the serial interface can be accurately determined, and the real-time performance of detection is improved.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a serial interface line detection device and electronic equipment. Background technique [0002] The signal transmitted by the existing RS232 (Recommended Standard 232, recommended standard No. 232) interface does not include the cable online status indication signal. When the device is disconnected due to cable failure, equipment failure on both sides of the communication, etc., the receiver cannot directly know that the device has been disconnected through the hardware signal, and can only indirectly analyze whether the connection has been interrupted through the communication software. In the above method, For the two types of payment requests, the device is offline and the sender has not sent data, the receiver can not receive the data, so it is impossible to distinguish the difference between the device offline and the sender not sending data, the real-time performance is r...

AI Technical Summary

Problems solved by technology

When the device is disconnected due to cable failure, equipment failure on both sides of the communication, etc., the receiver cannot directly know that the device has been disconnected through the hardware signal, and can only indirectly analyze whether the connection has been interrupted through the communication software. In the above method, For the two types of payment requests, the device is offline and the sender has not sent data, the receiver can not receive the data, so it is impossible to distinguish the difference between the device offline and the sender not sending data, the real-time performance is relatively poor, and the accuracy is not high

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