CN214154532U - Sensing communication node circuit and serial communication system - Google Patents
Sensing communication node circuit and serial communication system Download PDFInfo
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- CN214154532U CN214154532U CN202023154349.0U CN202023154349U CN214154532U CN 214154532 U CN214154532 U CN 214154532U CN 202023154349 U CN202023154349 U CN 202023154349U CN 214154532 U CN214154532 U CN 214154532U
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Abstract
The utility model discloses a sensing communication node circuit and serial-type communication system. When the existing sensor adopts bus transmission, a dial switch is needed for addressing, the operation is inconvenient, and the series connection stage number is very limited. The utility model discloses a control module, RS485 conversion module, the higher level interface of RJ45 and the interface of RJ45 subordinate. Three wires of the RJ45 superior interface and the RJ45 subordinate interface are respectively used as a coding wire and two communication wires. The coding input pin of the control module is connected with the coding line of the RJ45 superior interface, and the coding output pin is connected with the coding line of the RJ45 superior interface. The utility model discloses on the basis that utilizes the series connection to form the 485 bus, the coding line of each sensing communication node circuit all comes from the control module of last one-level sensing communication node circuit, can realize that the purpose of one-level sensing communication node circuit coding completion back to next one-level sensing communication node circuit transmission coding instruction.
Description
Technical Field
The utility model belongs to the technical field of the signal conversion, concretely relates to sensing communication node circuit and serial-type communication system based on RS 485.
Background
In modern industrial production, a large number of analog or switching signals are acquired by sensors. For example, in textile equipment, yarn breakage or tension signals of yarns need to be monitored, and analog signals or switching value signals are output by a tension sensor or a yarn breakage sensor; when the number of the sensors is large, the power supply and the signal transmission in a parallel mode become very inconvenient; in addition, when the existing sensor adopts bus transmission, a dial switch is needed for addressing, the operation is inconvenient, and the series connection stage number is very limited.
Disclosure of Invention
An object of the utility model is to provide a with analog quantity or switching value signal conversion for RS485 signal's sensing communication module and serial-type communication system.
The utility model relates to a sensing communication node circuit, including control module, RS485 conversion module, the higher level interface of RJ45 and the interface of RJ45 subordinate. Three wires of the RJ45 superior interface and the RJ45 subordinate interface are respectively used as a coding wire and two communication wires. The coding input pin of the control module is connected with the coding line of the RJ45 superior interface, and the coding output pin is connected with the coding line of the RJ45 superior interface.
The RS485 conversion module comprises an RS485 conversion chip U3. DI and RO pins of the RS485 conversion chip U3 are respectively connected to a serial port transmission line TX and a serial port receiving line RX of the control module. The DI pin of the RS485 conversion chip U3 is connected with the 5V output end of the voltage conversion module through a pull-up resistor R63. The A pin of the RS485 conversion chip U3 is connected with one end of a resistor R23 and a resistor FL 2. The other end of the resistor R23 is connected with the 5V output end of the voltage conversion module; the other end of the resistor FL2 is connected with one end of the TVS tube D20 and is used as a 485A interface of the RS485 conversion module. The other end of the TVS tube D20 is connected to the internal GND. The pin B of the RS485 conversion chip U3 is connected with one end of a resistor R21 and a resistor FL 1. The other end of the resistor R21 is connected with the 5V output end of the voltage conversion module; the other end of the resistor FL1 is connected with one end of the TVS tube D19 and is used as a 485B interface of the RS485 conversion module. The other end of the TVS tube D19 is connected to the internal GND. The 485A interface and the 485B interface of the RS485 conversion module are respectively connected to two communication lines of an RJ45 superior interface and two communication lines of an RJ45 subordinate interface.
Preferably, the RJ45 upper interface and the RJ45 lower interface use two wires as a power line and a ground line, respectively. The power line and the ground line of the RJ45 superior interface are respectively connected with the power line and the ground line of the RJ45 inferior interface. 24V voltage provided by the power lines and the ground wires of the RJ45 upper interface and the RJ45 lower interface is reduced by the voltage conversion module, and then power is supplied to the control module and the RS485 conversion module.
Preferably, the power line and the ground line of the RJ45 upper interface respectively provide an external 24V voltage and an external ground line EGND. The voltage conversion module comprises a voltage reduction chip U1. A VIN pin of the voltage reduction chip U1 is connected with external 24V voltage, and a GND pin is connected with an external ground wire; a capacitor EC1 and a capacitor C3 are connected between the external 24V voltage and an external ground wire in parallel; a resistor R8 and a resistor R9 are also connected in series between the external 24V voltage and an external ground wire EGND; the connection part of the resistor R8 and the resistor R9 is connected to an EN pin of the buck chip U1. The BST pin of the voltage reduction chip U1 is connected with one end of a capacitor C4, the LX pin is connected with the other end of a capacitor C4, one end of an inductor L2 and the cathode of a diode D5, and the FB pin is connected with one ends of a resistor R10 and a resistor R11. The other end of the inductor L2 is connected to the other end of the resistor R10 and one end of the capacitor C7, and is used as the 5V output end of the voltage conversion module. The anode of the diode D5, the other end of the resistor R11 and the capacitor C7 are all connected to the internal ground GND. The external ground EGND is isolated from the internal ground GND by a 0 ohm resistor R20.
Preferably, the control module is connected with an external sensor through a sensor signal isolation and conversion module.
Preferably, the sensor signal isolation conversion module comprises an optical coupling isolation chip U2. The positive input end of the optical coupling isolation chip U2 is connected with one end of a resistor R14C and a capacitor C11C and external 24V voltage, and the negative input end is connected with the other end of the resistor R14C and the capacitor C11C and one end of a resistor R16C. The other end of the resistor R16C is connected with the sensor. And the positive electrode output end of the optical coupling isolation chip U2 is connected with one end of a resistor R13C and a capacitor C10C. And the negative electrode output end of the optical coupling isolation chip U2 and the other end of the capacitor C10C are both connected with an internal ground wire GND. The other end of the resistor R13C is connected with the 5V output end of the voltage conversion module. And the positive output end of the optical coupling isolation chip U2 is used as the signal output end of the sensor signal isolation conversion module and is connected to the control module.
Preferably, the RS485 conversion chip U3
The DE pins are all connected to the transmission direction line DIR of the control module. The VCC pin of the RS485 conversion chip U3 is connected with one end of the capacitor C48 and the 5V output end of the voltage conversion module. The other end of the capacitor C48 is connected to the internal ground GND. And the GND pin of the RS485 conversion chip U3 is connected with an internal ground GND.
Preferably, the model of the RS485 conversion chip U3 is SP485 EEN.
Preferably, the main control chip in the control module adopts an STM8 series single chip microcomputer.
The utility model relates to a serial communication system, which comprises a plurality of sensing communication node circuits which are sequentially connected end to end; the lower interface of RJ45 in the former sensing communication node circuit is connected with the upper interface of RJ45 in the latter sensing communication node circuit through an RJ45 cable.
The utility model has the advantages that:
on the basis of forming a 485 bus by utilizing series connection, coding lines of all sensing communication node circuits are from a control module of a previous sensing communication node circuit; therefore, the purpose that the coding instruction is sent to the next-stage sensing communication node circuit after the previous-stage sensing communication node circuit completes coding can be achieved, and the sequential one-by-one coding of all the sensing communication node circuits is achieved. Furthermore, the utility model discloses integrate power cord, RS485 communication line and encoding line in RJ45 interface. The utility model discloses it keeps apart to have integrateed the opto-coupler, can realize the hot plug.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
fig. 2 is a schematic circuit diagram of the medium voltage conversion module according to the present invention;
fig. 3 is a schematic circuit diagram of the middle sensor signal isolation and conversion module of the present invention.
Fig. 4 is the circuit schematic diagram of the middle RS485 conversion module of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a sensing communication node circuit includes a voltage conversion module 1, a control module 2, an RS485 conversion module 3, a sensor signal isolation conversion module 4, an RJ45 upper interface 5, and an RJ45 lower interface 6. The main control chip in the control module 2 adopts an STM8 series single chip microcomputer, and is stable in work and low in cost. The voltage conversion module 1 supplies power to the control module 2 and the RS485 conversion module 3. Five wires of the RJ45 superior interface 5 and the RJ45 subordinate interface 6 are respectively a coding wire, two communication wires, a power wire and a ground wire. The 485 communication interface of the RJ45 upper interface 5 is connected with the 485 communication interface of the RJ45 lower interface 6 through two wires (485A and 485B in fig. 1). The power supply and ground wire interfaces of the RJ45 upper interface 5 and the power supply and ground wire interfaces of the RJ45 lower interface 6 are connected by two wires (24V, GND in fig. 1).
The serial port communication interface of the control module 2 is connected with the 485 communication interface of the RJ45 superior interface 5 through the RS485 conversion module 3. The coding input pin of the control module 2 is connected with a coding line (SIG _ ACK in fig. 1) of the RJ45 upper interface 5; the encoding output pin of the control module 2 is connected to the encoding line (CTL _ ACK in fig. 1) of the RJ45 upper interface 5. Each sensing communication node circuit corresponds to one sensor or a group of sensors. The signal interface and the configuration interface of the sensor are connected with the control module 2, so that the control module 2 can configure the working parameters of the sensor, and the sensor can send detected data to the control module 2 through the sensor signal isolation conversion module 4.
As shown in fig. 2, the voltage conversion module 1 includes a buck chip U1. The model of the buck chip U1 is AOZ1282 CI. A VIN pin of the voltage reduction chip U1 is connected with external 24V voltage, and a GND pin is connected with an external ground wire; a capacitor EC1 and a capacitor C3 are connected in parallel between the external 24V voltage and an external ground wire to carry out filtering and voltage stabilization; a resistor R8 and a resistor R9 are also connected in series between the external 24V voltage and an external ground wire EGND for voltage division; the connection of the resistor R8 and the resistor R9 is connected to an EN pin of the buck chip U1 for applying 12V voltage to enable the buck chip U1. The BST pin of the voltage reduction chip U1 is connected with one end of a capacitor C4, the LX pin is connected with the other end of a capacitor C4, one end of an inductor L2 and the cathode of a diode D5, and the FB pin is connected with one ends of a resistor R10 and a resistor R11. The other end of the inductor L2 is connected to the other end of the resistor R10 and one end of the capacitor C7, and serves as the 5V output terminal VDD5V of the voltage conversion module 1. The anode of the diode D5, the other end of the resistor R11 and the capacitor C7 are all connected to the internal ground GND. The external ground EGND is isolated from the internal ground GND by a 0 ohm resistor R20. The inductor L2, the diode D5 and the capacitor C4 constitute a bootstrap circuit. The output of the LX pin of the voltage reduction chip U1 is determined by the feedback voltage of the FB pin, so that the 24V external input voltage is reduced to 5V, power is supplied to the main control chip, the 485 module and the like, and the relationship between LX and FB is as follows:
voltage value of 5V output end VDD5V (namely LB) of voltage conversion module 1
Wherein R is10、R11Resistance values of the resistor R10 and the resistor R11 respectively; set R10＝6.8KΩ，R111.27K Ω; therefore, the voltage value V of the 5V output terminal VDD5V of the voltage conversion module 1o＝5.08V。
As shown in fig. 3, the sensor signal isolation conversion module 4 includes an optical coupling isolation chip U2. The model of the optical coupling isolation chip U2 is OP 3C. The positive input end of the optical coupling isolation chip U2 is connected with one end of a resistor R14C and a capacitor C11C and external 24V voltage, and the negative input end is connected with the other end of the resistor R14C and the capacitor C11C and one end of a resistor R16C. The other end of the resistor R16C is connected to a signal output interface SIG _ IN of the sensor. And the positive electrode output end of the optical coupling isolation chip U2 is connected with one end of a resistor R13C and a capacitor C10C. And the negative electrode output end of the optical coupling isolation chip U2 and the other end of the capacitor C10C are both connected with an internal ground wire GND. The other end of the resistor R13C is connected to the 5V output terminal VDD5V of the voltage conversion module 1. And the positive electrode output end of the optical coupling isolation chip U2 is used as a signal output end SIG of the sensor signal isolation conversion module 4 and is connected to a signal input interface of the control module 2.
When the sensor outputs 24V high level to the negative electrode input end of the optical coupling isolation chip U2, the voltage at two ends of the optical coupling diode in the optical coupling isolation chip U2 is 0, the optical coupling diode is cut off, and the signal output end SIG outputs 5V high level; on the contrary, when the sensor outputs a low level, the optocoupler diode is conducted, and the signal output end SIG outputs a 0V low level. The optical coupler realizes signal one-way transmission, the input end and the output end are electrically isolated, the output signal has no influence on the input end, and the anti-interference capability is strong. And the input end and output end capacitors C10 and C1 can filter the jitter and interference of the input signal, and ensure the stability of the input signal.
As shown in fig. 4, the RS485 conversion module 3 includes an RS485 conversion chip U3. The model of the RS485 conversion chip U3 is SP485 EEN. DI and RO pins of the RS485 conversion chip U3 are respectively connected to a serial port transmission line TX and a serial port receiving line RX of the control module 2. The DI pin of the RS485 conversion chip U3 is connected to the 5V output terminal VDD5V of the voltage conversion module 1 through a 10K Ω pull-up resistor R63. Of RS485 conversion chip U3
The DE pins are all connected to the transmission direction line DIR of the control module 2. The VCC pin of the RS485 conversion chip U3 is connected to one end of the capacitor C48 and the 5V output terminal VDD5V of the voltage conversion module 1. The other end of the capacitor C48 is connected with an internal ground wire GND, so that the working voltage of the RS485 conversion chip U3 is ensured to be stable. And the GND pin of the RS485 conversion chip U3 is connected with an internal ground GND. The A pin of the RS485 conversion chip U3 is connected with one end of a resistor R23 and a resistor FL 2. The other end of the resistor R23 is connected with voltage conversionThe 5V output terminal VDD5V of module 1; the other end of the resistor FL2 is connected with one end of the TVS tube D20 and is used as the 485A interface of the RS485 conversion module 3. The other end of the TVS tube D20 is connected to the internal GND. The pin B of the RS485 conversion chip U3 is connected with one end of a resistor R21 and a resistor FL 1. The other end of the resistor R21 is connected with the 5V output end VDD5V of the voltage conversion module 1; the other end of the resistor FL1 is connected with one end of the TVS tube D19 and is used as the 485B interface of the RS485 conversion module 3. The other end of the TVS tube D19 is connected to the internal GND. The 485A interface and the 485B interface of the RS485 conversion module 3 are respectively connected to two communication lines of the RJ45 upper interface 5 and two communication lines of the RJ45 lower interface 6.
The working principle of the utility model is as follows:
the external power supply inputs 24V, the voltage conversion module 1 converts the 24V voltage into 5V voltage and sends the 5V voltage to the control module 2, the sensor signal isolation conversion module 4 and the RS485 conversion module 3; the control module 2 starts to work, and the sensor signal isolation and conversion module 4 inputs the processed sensor input signal into the control module 2; after the control module 2 processes the sensor signal, the sensor signal is converted into a 485 signal by the RS485 conversion module 3, and the 485 signal is sent to a host or an upper computer through the RJ45 upper interface 5 and the RJ45 lower interface 6. In addition, the host or the upper computer can number the sensing communication node circuit and configure the sensor through the RJ45 upper interface 5 and the RJ45 lower interface 6.
Example 2
A serial communication system comprising a plurality of sensing communication node circuits as described in embodiment 1 connected end to end in sequence; up to 256 stages are connected. The lower interface 6 of the RJ45 in the previous sensing communication node circuit is connected with the upper interface 5 of the RJ45 in the next sensing communication node circuit through an RJ45 cable, so that a 485 bus is formed; each sensing communication node circuit can be connected to an upper computer by a 485 bus. The serial connection mode reduces the complexity of wiring, and 24V, GND power supply, an RS485 communication line and an automatic coding line of a plurality of nodes can be provided through an RJ45 cable.
The working principle of the serial communication system is as follows:
taking a sensing communication node circuit at the head end as a communication host, and taking the other sensing communication node circuits as communication slaves; the communication master sends addressing commands to the first level communication slave by means of a code line connected to the first level communication slave control module 2. Then, each communication slave machine sends an addressing instruction backward step by step, and addressing of each communication slave machine can be completed step by step according to the sequence; because the addressing instruction of the middle and later level communication slave machine of the utility model only comes from the former level communication slave machine; therefore, the addressing sequence of each communication slave machine can be ensured, and the addressing disorder is avoided. After addressing is finished, the serial communication system can stably upload data by using the 485 bus.
Claims (9)
1. A sensing communication node circuit comprises a control module (2) and an RS485 conversion module (3); the method is characterized in that: the system also comprises an RJ45 upper interface (5) and an RJ45 lower interface (6); three wires of the RJ45 superior interface (5) and the RJ45 subordinate interface (6) are respectively used as a coding wire and two communication wires; a coding input pin of the control module (2) is connected with a coding line of the RJ45 superior interface (5), and a coding output pin is connected with a coding line of the RJ45 superior interface (5);
the RS485 conversion module (3) comprises an RS485 conversion chip U3; DI and RO pins of the RS485 conversion chip U3 are respectively connected to a serial port transmitting line TX and a serial port receiving line RX of the control module (2); the DI pin of the RS485 conversion chip U3 is connected with the 5V output end of the voltage conversion module (1) through a pull-up resistor R63; the pin A of the RS485 conversion chip U3 is connected with one end of a resistor R23 and a resistor FL 2; the other end of the resistor R23 is connected with the 5V output end of the voltage conversion module (1); the other end of the resistor FL2 is connected with one end of a TVS tube D20 and is used as a 485A interface of the RS485 conversion module (3); the other end of the TVS tube D20 is connected with an internal GND; the pin B of the RS485 conversion chip U3 is connected with one end of a resistor R21 and a resistor FL 1; the other end of the resistor R21 is connected with the 5V output end of the voltage conversion module (1); the other end of the resistor FL1 is connected with one end of a TVS tube D19 and is used as a 485B interface of the RS485 conversion module (3); the other end of the TVS tube D19 is connected with an internal GND; the 485A interface and the 485B interface of the RS485 conversion module (3) are respectively connected to two communication lines of the RJ45 superior interface (5) and two communication lines of the RJ45 subordinate interface (6).
2. The sensing communications node circuit of claim 1, wherein: the RJ45 upper interface (5) and the RJ45 lower interface (6) respectively use two wires as a power line and a ground line; the power line and the ground line of the RJ45 superior interface (5) are respectively connected with the power line and the ground line of the RJ45 inferior interface (6); 24V voltage provided by power lines and ground wires of an RJ45 upper interface (5) and an RJ45 lower interface (6) is reduced by the voltage conversion module (1) and then supplies power to the control module (2) and the RS485 conversion module (3).
3. The sensing communication node circuit of claim 2, wherein: the power line and the ground wire of the RJ45 upper interface (5) respectively provide external 24V voltage and an external ground wire EGND; the voltage conversion module (1) comprises a voltage reduction chip U1; a VIN pin of the voltage reduction chip U1 is connected with external 24V voltage, and a GND pin is connected with an external ground wire; a capacitor EC1 and a capacitor C3 are connected between the external 24V voltage and an external ground wire in parallel; a resistor R8 and a resistor R9 are also connected in series between the external 24V voltage and an external ground wire EGND; the connection part of the resistor R8 and the resistor R9 is connected to an EN pin of the buck chip U1; the BST pin of the voltage reduction chip U1 is connected with one end of a capacitor C4, the LX pin is connected with the other end of a capacitor C4, one end of an inductor L2 and the cathode of a diode D5, and the FB pin is connected with one ends of a resistor R10 and a resistor R11; the other end of the inductor L2 is connected with the other end of the resistor R10 and one end of the capacitor C7 and is used as a 5V output end of the voltage conversion module (1); the anode of the diode D5, the other end of the resistor R11 and the other end of the capacitor C7 are all connected with an internal ground GND; the external ground EGND is isolated from the internal ground GND by a 0 ohm resistor R20.
4. The sensing communications node circuit of claim 1, wherein: the control module (2) is connected with an external sensor through a sensor signal isolation and conversion module (4).
5. The sensing communications node circuit of claim 4, wherein: the sensor signal isolation conversion module (4) comprises an optical coupling isolation chip U2; the positive input end of the optical coupling isolation chip U2 is connected with one end of a resistor R14C and a capacitor C11C and external 24V voltage, and the negative input end is connected with the other end of the resistor R14C and the capacitor C11C and one end of a resistor R16C; the other end of the resistor R16C is connected with the sensor; the positive electrode output end of the optical coupling isolation chip U2 is connected with one end of a resistor R13C and a capacitor C10C; the negative output end of the optical coupling isolation chip U2 and the other end of the capacitor C10C are both connected with an internal ground wire GND; the other end of the resistor R13C is connected with the 5V output end of the voltage conversion module (1); the positive output end of the optical coupling isolation chip U2 is used as the signal output end of the sensor signal isolation conversion module (4) and is connected to the control module (2).
6. The sensing communications node circuit of claim 1, wherein: the RE pin and the DE pin of the RS485 conversion chip U3 are both connected to a transmission direction line DIR of the control module (2); a VCC pin of the RS485 conversion chip U3 is connected with one end of a capacitor C48 and a 5V output end of the voltage conversion module (1); the other end of the capacitor C48 is connected with the internal ground GND; and the GND pin of the RS485 conversion chip U3 is connected with an internal ground GND.
7. The sensing communications node circuit of claim 1, wherein: the model of the RS485 conversion chip U3 is SP485 EEN.
8. The sensing communications node circuit of claim 1, wherein: and a main control chip in the control module (2) adopts an STM8 series single chip microcomputer.
9. A tandem communication system, characterized by: comprising a plurality of the sensing communication node circuits of claim 1 connected end to end in sequence; and the RJ45 lower interface (6) in the previous sensing communication node circuit is connected with the RJ45 upper interface (5) of the next sensing communication node circuit through an RJ45 cable.
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| CN115174523A (en) * | 2022-07-22 | 2022-10-11 | 中航电测仪器股份有限公司 | Automatic addressing system and method for sensor |
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