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RS-485 interface chip with automatic transceiving function and control method of RS-485 interface chip

A RS-485 and interface chip technology, which is applied in logic circuit interface devices, logic circuit connection/interface layout, instruments, etc., can solve the problems of weak drive capability of RS-485 chips, transmission speed limitation, etc., and facilitate miniaturization design , saving external components, the effect of unlimited transmission speed

Pending Publication Date: 2017-05-17
南京国博电子股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor finds that the prior art has at least the following problems: because the existing RS-485 chip realizes the automatic sending and receiving function by the peripheral circuit, and the upper / lower resistance is used to drive to high / low level, resulting in RS-485 -485 chip has weak driving ability and limited transmission speed

Method used

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  • RS-485 interface chip with automatic transceiving function and control method of RS-485 interface chip
  • RS-485 interface chip with automatic transceiving function and control method of RS-485 interface chip
  • RS-485 interface chip with automatic transceiving function and control method of RS-485 interface chip

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Embodiment Construction

[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] figure 2 It is a schematic structural diagram of an RS-485 interface chip with automatic transceiver function according to an exemplary embodiment.

[0038] The RS-485 interface chip with automatic sending and receiving function includes an RS-485 chip 110 and a control signal identification circuit 120 arranged in the RS485 chip 110 .

[0039] The control signal identification circuit 120 is connected with the driver input terminal DI of the RS-485 chip;

[0040] The control signal identification circuit 120 is connected with the state machine 111 in the RS-485 chip;

[0041] The state machine 111 is connected to the receiver 112 in the RS-485 chip 110;

[0042] The state machine 111 is connected to the driver 113 in the RS-485 ch...

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Abstract

The invention discloses an RS-485 interface chip with an automatic transceiving function and a control method of the RS-485 interface chip, and belongs to the technical field of communication circuits. The RS-485 interface chip with the automatic transceiving function comprises an RS-485 chip and a control signal recognition circuit arranged in the RS-485 chip; the control signal recognition circuit is connected with the driver input end of the RS-485 chip and a stae machine arranged in the RS-485 chip. Accordingly, the problems that in the related technique, an RS-485 chip can achieve the automatic transceiving function only by being connected with a peripheral circuit and is weak in driving capacity, and the data transmission speed of the RS-485 chip is limited are solved, and the advantages that the automatic transceiving function can be achieved without the peripheral circuit, the transmission speed is not limited, external elements are reduced, and miniaturization design of the equipment is promoted are achieved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of communication circuits, and in particular, to an RS-485 chip with automatic transceiver function and a control method thereof. Background technique [0002] RS-485 is a serial communication protocol based on differential signal transmission, which has the characteristics of long-distance transmission. Since RS-485 is a half-duplex communication protocol, the receiving state and the sending state need to be converted during communication. [0003] In the traditional RS-485 circuit networking communication, three signal lines are required, which are the sending signal line, the receiving signal line and the state control signal line. When the state control signal line is high, the RS-485 chip is in the sending state. When the status signal control line is low, the RS-485 chip is in the receiving state. This kind of RS-485 chip does not have the function of automatic sending and recei...

Claims

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Application Information

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IPC IPC(8): H03K19/0175G06F13/42
CPCH03K19/017509G06F13/4282
Inventor 徐义强范建林朱波康明辉郭玮刘瑞有
Owner 南京国博电子股份有限公司
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