RS485 communication circuit with signal transceiving control
A RS485, signal sending and receiving technology, applied in the field of power system, can solve the problems of signal management defects and inability to signal control, and achieve the effect of preventing malfunction and improving the effect of signal control.
Inactive Publication Date: 2016-11-09
HENGYE ELECTRONICS JIAXING CITY
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Problems solved by technology
[0003] In the existing smart meters, the RS485 communication circuit used only has the functions of signal receiving and signal transmission, so there are defects in the management of signals, and the signals in the RS485 communication circuit cannot be effectively controlled
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Embodiment 1
[0016] The present invention provides RS485 communication circuit with signal transceiving control, micro-control unit 1 is arranged in RS485 communication circuit, micro-control unit 1 is electrically connected with signal receiving circuit 2, signal transmitting circuit 3 and signal transceiving control circuit 4, signal The transceiver control circuit includes a first optocoupler 41, a first resistor 42, a second resistor 43 and a third resistor 44;
[0017] The first end pin in the first optocoupler 41 is connected on the microcontroller unit 1, one end of the first resistance 42 is connected on the first end pin of the first optocoupler 41, and one end of the second resistance 43 is connected on the second end pin. On the second terminal pin of an optical coupler 41, one end of the third resistor 44 is connected on the third terminal pin of the first optocoupler 41, and the other end of the third resistor 44 is connected to the second terminal pin of the first optocoupler ...
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The invention provides a RS485 communication circuit with signal transceiving control. A micro-control unit, a signal receiving circuit, a signal transmitting circuit and a signal transceiving control circuit are arranged in the RS485 communication circuit, wherein the first end pin in a first optical coupler is connected onto the micro-control unit; one end of a first resistor is connected onto the first end pin of the first optical coupler; one end of a second resistor is connected onto the second end pin of the first optical coupler; one end of a third resistor is connected onto the third end pin of the first optical coupler; and the other end of the third resistor is connected with the second end pin of the first optical coupler. The signal transceiving process in the RS485 communication circuit is controlled through matching of the optical coupler in the signal transceiving control circuit and multiple resistors; the disadvantage that the function of the RS485 circuit is incomplete in function in the prior art can be made up; simultaneously, a weak pull-up resistor is also additionally arranged in the RS485 communication circuit; when a signal in the circuit is non-steady, wrong operation of the optical coupler can be avoided; and thus, the signal control effect is improved.
Description
technical field [0001] The invention belongs to the field of power systems, in particular to an RS485 communication circuit with signal sending and receiving control. Background technique [0002] At present, due to the characteristics of accurate measurement and convenient communication, smart meters have replaced the old-fashioned energy meters and become mainstream products in the power system. [0003] In existing smart meters, the RS485 communication circuit used only has the functions of signal reception and signal transmission, so there are defects in signal management, and the signals in the RS485 communication circuit cannot be effectively controlled. Contents of the invention [0004] In order to solve the shortcomings and deficiencies in the prior art, the invention provides an RS485 communication circuit with signal transceiving control which improves the signal control effect. [0005] In order to achieve the above-mentioned technical purpose, the RS485 commu...
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IPC IPC(8): H04B1/40
CPCH04B1/40
Inventor 胡萌傅亮孙林忠
Owner HENGYE ELECTRONICS JIAXING CITY