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Switching equipment for standard serial port

A transfer device and standard serial port technology, applied in the direction of logic circuit connection/interface layout, etc., can solve problems such as restricting applications, affecting signal transmission, changing interface types, etc., and achieve the effects of restoring signal strength, extending transmission distance, and making production convenient

Inactive Publication Date: 2009-01-14
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, although RS-232 is a commonly used serial interface, its application is limited due to its maximum transmission distance of only about 30 meters
At the same time, if multiple serial ports are connected in parallel, the signal transmission will also be affected due to the voltage drop
In order to extend the transmission distance, an existing technical solution is to set a converter at the RS-232 interface to convert it into a 485 interface. Although this method can utilize the existing 232 interface to achieve longer distance transmission, But it essentially changes the interface type, its structure is more complicated, and it needs to be converted to adopt the 485 communication protocol, which does not really extend the transmission distance of the standard interface

Method used

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  • Switching equipment for standard serial port
  • Switching equipment for standard serial port

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment one: see attached figure 1 As shown, a standard serial port switching device includes a switching circuit, and the switching circuit is formed by connecting two RS-232 level and TTL level switching circuits, and the RS-232 switching circuit in the first switching circuit The flat end is the input end of the switching device, the RS-232 level end in the second conversion circuit is the output end of the switching device, the data receiving end in the TTL level end of the first conversion circuit is connected with the TTL level end of the second conversion circuit The data sending end of the flat end is electrically connected, and the data sending end of the TTL level end of the first conversion circuit is electrically connected with the data receiving end of the TTL level end of the second conversion circuit.

[0021] The above-mentioned switching circuit is set in the casing, and the casing is provided with two 9-pin serial interface connectors, the RS-232 le...

Embodiment 2

[0023] Embodiment two: referring to shown in accompanying drawing 2, a kind of transfer device of standard serial port, can be used for realizing 1 to 10 of standard serial port, it comprises a transfer circuit, and described transfer circuit adopts two-way RS-232 level and The TTL level conversion circuit is connected and formed by using the MAX232EEWE chip. The RS-232 level terminal in the first conversion circuit is used as the input terminal of the conversion device, and the RS-232 level terminal in the second conversion circuit is used as the input terminal of the conversion device. Output terminal, the data receiving end in the TTL level end of the first conversion circuit is electrically connected with the data sending end in the TTL level end of the second conversion circuit, the data sending end in the TTL level end of the first conversion circuit is connected with the second conversion circuit The data receiving end in the TTL level end of the circuit is electrically ...

Embodiment 3

[0026] Embodiment three: a standard serial port switching device, including 4 switching circuits, each switching circuit is formed by connecting two RS-232 level and TTL level conversion circuits, the TTL level of the first conversion circuit The data receiving end in the flat end is electrically connected to the data sending end in the TTL level end of the second conversion circuit, and the data sending end in the TTL level end of the first conversion circuit is connected to the data receiving end in the TTL level end of the second conversion circuit Electrically connected, the RS-232 level terminals of the first conversion circuit in each switching circuit are connected in parallel to form an input terminal, and the RS-232 level terminals of the second conversion circuit in each switching circuit respectively form an output terminal.

[0027] The above-mentioned switching circuit is arranged in the casing, and a 9-pin input interface connector and 4 output interface connector...

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Abstract

The invention discloses a standard serial port switching device characterized in that it comprises at least a switching circuit. The switching circuit is constituted by connecting two RS-232 level and TTL level conversion circuit. RS-232 level end of first switching circuit is input end of switching device, RS-232 level end of second switching circuit is output end; data receiving end of the first switching circuit TTL level terminal is electrically connected with data transmission terminal of the second switching circuit TTL level terminal; data transmission terminal of the first switching circuit TTL level terminal is electrically connected with data receiving terminal of the second switching circuit TTL level terminal. In the invention TTL terminal signal of level switching circuit innovatively enters into another level switching circuit TTL terminal in reverse direction thereby accomplishing level signal shaping, signal strength recovery and prolonged standard serial port transmission distance.

Description

technical field [0001] The invention relates to a communication interface switching device, in particular to a standard serial port switching device for extending the communication distance or increasing the number of parallel interfaces. Background technique [0002] The RS-232 interface is an interface configured by most computers, and is called a standard serial port. The communication standard it uses is "the serial binary data exchange interface technical standard between data terminal equipment (DTE) and data communication equipment (DCE)". In RS-232 communication, simplified RS-232 communication is often used, and only 3 wires are used for communication: RxD (receiving wire), TxD (sending wire) and GND (ground wire). Others are used to connect to the modem for long-distance transmission, and some can also be used as hardware handshake signals. The interface usually uses 9-pin wiring. [0003] RS-232 adopts an unbalanced transmission method, that is, the so-called sin...

Claims

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Application Information

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IPC IPC(8): H03K19/0175
Inventor 王宜怀刘纯平刘晓升
Owner SUZHOU UNIV
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