CN218450117U - RS-232 and RS-485 isolated communication relay module - Google Patents
RS-232 and RS-485 isolated communication relay module Download PDFInfo
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- CN218450117U CN218450117U CN202222510282.2U CN202222510282U CN218450117U CN 218450117 U CN218450117 U CN 218450117U CN 202222510282 U CN202222510282 U CN 202222510282U CN 218450117 U CN218450117 U CN 218450117U
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Abstract
The utility model discloses a RS-232 and RS-485 isolated form communication relay module, including power supply circuit, 232 buffer circuit and 485 buffer circuit, power supply circuit is connected with 232 buffer circuit and 485 buffer circuit respectively and is 232 buffer circuit and 485 buffer circuit power supply, 232 buffer circuit is used for converting the 232 level signal of outside input into TTL level signal after keeping apart then transmits 485 buffer circuit, TTL level signal after keeping apart converts the 485 differential signal level after keeping apart into again, and export outward, 485 buffer circuit is used for converting the 485 differential signal into the TTL level signal after keeping apart, convey for 232 buffer circuit again, and the 232 level output after changing into keeping apart. The utility model discloses a 232 bus, 485 bus and power signal's three keeps apart each other, and RS485 signal and the interconversion between the RS232 signal in the completion transmission course that can be reliable and stable have increased the interference killing feature, have improved life.
Description
Technical Field
The utility model relates to a medical communication technology field especially relates to a RS-232 and RS-485 isolated form communication relay module.
Background
The RS485 communication interface which is commonly used in the medical component communication network at present becomes one of the most commonly used forms of network data transmission due to the advantages of good noise interference resistance, long transmission distance, multi-station capability and the like. However, the communication interface in the device manufactured by many manufacturers is the earliest serial communication interface RS232, so the device component must complete the conversion between the two communication buses before the data upload background or after receiving background data, so as to complete the data transmission between the device and the background monitoring successfully.
In summary, a bus converter is required to be added between the RS232 interface and the RS485 interface. At present, in RS232 and RS485 converters in the market, RS-485 bus signals and RS-232 bus signals are not isolated, only isolation between a power supply and the buses is conducted, data transmission is unstable due to inconsistent electrical levels, and if the RS485 buses are subjected to strong external interference in a long-distance transmission process, the situations of error codes, code loss and even non-communication are easy to occur, and signal conversion is not ideal. Therefore, how to stably and reliably complete the interconversion between the RS485 signal and the RS232 signal in the transmission process is a problem that needs to be solved at present.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems in the prior art, an object of the present invention is to provide an RS-232 and RS-485 isolation type communication relay module, which can stably and reliably complete the interconversion between the RS485 signal and the RS232 signal in the transmission process.
In order to solve the technical problem, the utility model discloses a technical scheme as follows: the power supply circuit comprises a power supply circuit, a 232 isolating circuit and a 485 isolating circuit;
the power supply circuit is respectively connected with the 232 isolating circuit and the 485 isolating circuit and supplies power to the 232 isolating circuit and the 485 isolating circuit;
the 232 isolation circuit is used for converting an externally input 232 level signal into an isolated TTL level signal and then transmitting the isolated TTL level signal to the 485 isolation circuit, converting the isolated TTL level signal into an isolated 485 differential signal level through the 485 isolation circuit and outputting the level to the outside so as to realize conversion from a 232 bus to a 485 bus;
the 485 isolation circuit is used for converting the 485 differential signal into an isolated TTL level signal, transmitting the isolated TTL level signal to the 232 isolation circuit, converting the isolated TTL level signal into an isolated 232 level signal and outputting the isolated 232 level signal, and converting the 485 bus into the 232 bus.
As a further improvement, power supply circuit includes first binding post, zener diode, first ceramic capacitor and electrolytic capacitor, first binding post's pin 1 is connected with zener diode's positive pole, first ceramic capacitor's one end and electrolytic capacitor's negative pole respectively, first binding post's pin 2 is connected with zener diode's negative pole, first ceramic capacitor's the other end, electrolytic capacitor's positive pole respectively, first binding post's pin 1 connects to power ground, and 5V operating voltage is inserted to first binding post's pin 2.
As a further improvement of the present invention, 232 isolation circuit includes 232 communication chip, second ceramic electric capacity, third ceramic electric capacity, fourth ceramic electric capacity, fifth ceramic electric capacity, sixth ceramic electric capacity, seventh ceramic electric capacity and 232 connection terminal, pin 2 and pin 3 of 232 communication chip are connected the back and are inserted 5V operating voltage and connect power ground through fourth ceramic electric capacity, pin 4, pin 5, pin 6 and pin 7 of 232 communication chip all connect the back with the other end of fourth ceramic electric capacity and connect power ground, pin 10 of 232 communication chip connects power ground, pin 11 and the one end of seventh ceramic electric capacity of 232 communication chip connect the back and connect first signal ground, pin 12 and the other end of seventh ceramic electric capacity of 232 communication chip are connected, pin 13 and the one end of sixth ceramic electric capacity of 232 communication chip are connected, pin 14 and the other end of sixth ceramic electric capacity of 232 communication chip are connected, pin 15 and pin 2 of 232 communication chip connect, pin 16 and pin 1 of 232 communication chip connect, pin 3 of first ceramic electric capacity connects pin 18 and another end of ceramic electric capacity of first ceramic electric capacity and second ceramic electric capacity of pin and connection terminal, pin 18 and another end of second ceramic communication chip connect the other end of ceramic electric capacity of 232 communication chip and connection terminal, pin 18 and second ceramic electric capacity of 232 communication chip and another terminal of 232 communication chip.
As a further improvement of the present invention, the 485 isolation circuit comprises a 485 communication chip, an eighth ceramic capacitor, a ninth ceramic capacitor, a tenth ceramic capacitor, an eleventh ceramic capacitor, a twelfth ceramic capacitor, a thirteenth ceramic capacitor, a 485 connection terminal, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a triode, wherein pin 1 of the 485 communication chip is connected with one end of the eleventh ceramic capacitor, one end of the tenth ceramic capacitor and one end of the third resistor respectively and then connected with a 5V working voltage, pin 2 of the 485 communication chip) is connected with a power ground and respectively connected with the other end of the eleventh ceramic capacitor and the other end of the tenth ceramic capacitor, pin 3 of the 485 communication chip is connected with the other end of the third resistor and pin 9 of the 232 communication chip respectively, pin 4 of the 485 communication chip is connected with pin 5 and then connected with a collector of the triode and one end of the sixth resistor respectively, the other end of the sixth resistor is connected with a 5V working voltage, pin 6 of the 485 communication pin is connected with pin 8 of the thirteenth ceramic capacitor, pin is connected with the other end of the thirteenth ceramic capacitor, pin is connected with a signal terminal, pin 7 of the 485 communication chip is connected with the other end of the ground, and the third resistor is connected with the ground, the signal terminal of the second pin of the 485 communication chip, the signal terminal is connected with the fifth resistor, the signal terminal is connected with the signal terminal of the ground and the ground, the other end of the seventh resistor is connected with a pin 16 of the 485 communication chip, a pin 13 of the 485 communication chip is respectively connected with one end of a ninth ceramic capacitor, one end of a first resistor, one end of a second resistor and the other end of a fourth resistor, the other end of the ninth ceramic capacitor is connected with a second signal ground, the other end of the first resistor is connected with the second signal ground, the other end of the second resistor is connected with a pin 1 of the 485 connection terminal, a pin 15 of the 485 communication chip is respectively connected with one end of a twelfth ceramic capacitor and one end of an eighth ceramic capacitor and then connected with the second signal ground, a pin 16 of the 485 communication chip is respectively connected with the other end of the twelfth ceramic capacitor and the other end of the eighth ceramic capacitor, and a pin 3 of the 485 connection terminal is connected with the second signal ground.
As a further improvement, the 485 isolating circuit also comprises an electrostatic discharge chip, pin 1 of the electrostatic discharge chip is connected with pin 2 of the 485 connecting terminal, pin 2 of the electrostatic discharge chip is connected with pin 1 of the 485 connecting terminal, and pin 3 of the electrostatic discharge chip is connected with the second signal ground.
As a further improvement of the utility model, the model of the 232 communication chip is ADM3251EARWZ-RE.
As a further improvement of the present invention, the model of the 485 communication chip is TD51S485HC.
As a further improvement of the present invention, the resistance values of the first resistor and the seventh resistor are 120 Ω -380 Ω, and the resistance value of the fourth resistor is 120 Ω.
Compared with the prior art, the utility model, following beneficial effect has:
1. the utility model relates to a RS-232 and RS-485 isolated form communication relay module, through adopting 232 buffer circuit and 485 buffer circuit, realized that 232 bus, 485 bus and power signal's three keeps apart each other, can be reliable and stable accomplish the interconversion between the RS485 signal in the transmission course and the RS232 signal to can effectively restrain surge voltage on the communication bus, situations such as transient state excessive pressure, increase the interference killing feature, improve life.
2. The utility model relates to a RS-232 and RS-485 isolated form communication relay module replaces the mode that traditional opto-coupler kept apart through the mode that uses the chip to keep apart, has simplified circuit complexity, has strengthened the reliability.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a circuit diagram of the power supply unit of the present invention;
fig. 3 is a diagram of the 232 isolating circuit structure of the present invention;
FIG. 4 is a view of the 485 isolation circuit structure of the present invention;
fig. 5 is a detailed table of the middle electronic component of the present invention.
In the drawings:
p1, a first connecting terminal; d1, a voltage stabilizing diode; c1, a first ceramic capacitor; e1, an electrolytic capacitor;
u1, 232 communication chip; c2, a second ceramic capacitor; c3, a third ceramic capacitor; c4, a fourth ceramic capacitor; c5, a fifth ceramic capacitor; c6, a sixth ceramic capacitor; c7, a seventh ceramic capacitor; p2, 232 terminals;
the U2 and 485 isolation circuit comprises a 485 communication chip; c8, an eighth ceramic capacitor; c9, ninth ceramic capacitor; c10, tenth ceramic capacitor; c11, an eleventh ceramic capacitor; c12, a twelfth ceramic capacitor; c13, a thirteenth ceramic capacitor; p3, 485 wiring terminals; r1, a first resistor; r2 and a second resistor; r3, a third resistor; r4, a fourth resistor; r5 and a fifth resistor; r6 and a sixth resistor; r7 and a seventh resistor; r8 and an eighth resistor; q1, a triode; u3, electrostatic discharge chip.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 to 4 are schematic structural diagrams illustrating an embodiment of an RS-232 and RS-485 isolation type communication relay module according to the present invention, and a main body of the communication relay module includes a power supply circuit, a 232 isolation circuit and a 485 isolation circuit.
The power supply circuit is respectively connected with the 232 isolation circuit and the 485 isolation circuit and supplies power to the 232 isolation circuit and the 485 isolation circuit. As shown in fig. 1, fig. 1 is an overall architecture of the entire module, and the 232 isolation circuit and the 485 isolation circuit of the module are both powered by the power supply circuit, and communication is performed between the 232 isolation circuit and the 485 isolation circuit. As shown in fig. 2, the power supply circuit includes a first connection terminal P1, a zener diode D1, a first ceramic capacitor C1, and an electrolytic capacitor E1, a pin 1 of the first connection terminal P1 is respectively connected to an anode of the zener diode D1, one end of the first ceramic capacitor C1, and a cathode of the electrolytic capacitor E1, a pin 2 of the first connection terminal P1 is respectively connected to a cathode of the zener diode D1, the other end of the first ceramic capacitor C1, and an anode of the electrolytic capacitor E1, the pin 1 of the first connection terminal P1 is connected to a power ground GND, and a pin 2 of the first connection terminal P1 is connected to a 5V operating voltage. In this embodiment, outside 5V voltage inserts the back through first binding post P1, carries out the steady voltage through zener diode D1, reduces the interference of power, carries out filtering through first ceramic capacitor C1's one end again, reduces the power ripple, passes through electrolytic capacitor E1's positive end again, carries out energy storage steady voltage effect, guarantees the stability of 5V power. The electrolytic capacitor E1 has a capacity of 47uF and an upper limit of a withstand voltage of 16V.
The 232 isolation circuit is used for converting an externally input 232 level signal into an isolated TTL level signal and then transmitting the isolated TTL level signal to the 485 isolation circuit, converting the isolated TTL level signal into an isolated 485 differential signal level through the 485 isolation circuit, outputting the level externally, and realizing conversion from the 232 bus to the 485 bus. Specifically, the 232 isolation circuit comprises a 232 communication chip U1, a second ceramic capacitor C2, a third ceramic capacitor C3, a fourth ceramic capacitor C4, a fifth ceramic capacitor C5, a sixth ceramic capacitor C6, a seventh ceramic capacitor C7 and a 232 wiring terminal P2, a 5V working voltage is connected to a pin 2 of the 232 communication chip U1 after being connected with a pin 3, the power ground GND is connected through the fourth ceramic capacitor C4, the pin 5, the pin 6 and the pin 7 of the 232 communication chip U1 are connected with the other end of the fourth ceramic capacitor C4 and then connected with the power ground GND, a pin 10 of the 232 communication chip U1 is connected with the power ground GND, a pin 11 of the 232 communication chip U1 is connected with one end of the seventh ceramic capacitor C7 and then connected with a first signal ground-1, a pin 12 of the 232 communication chip U1 is connected with the other end of the seventh ceramic capacitor C7, a pin 13 of the 232 communication chip U1 is connected to one end of a sixth ceramic capacitor C6, a pin 14 of the 232 communication chip U1 is connected to the other end of the sixth ceramic capacitor C6, a pin 15 of the 232 communication chip U1 is connected to a pin 2 of the 232 connection terminal P2, a pin 16 of the 232 communication chip U1 is connected to a pin 1 of the 232 connection terminal P2, a pin 3 of the first connection terminal P1 is connected to a first signal ground GND-1, a pin 17 of the 232 communication chip U1 is connected to one end of a fifth ceramic capacitor C5, a pin 18 of the 232 communication chip U1 is connected to the other end of the fifth ceramic capacitor C5, a pin 19 of the 232 communication chip U1 is connected to one end of a third ceramic capacitor C3, a pin 20 of the 232 communication chip U1 is connected to the other end of the third ceramic capacitor C3 and one end of a second ceramic capacitor C2, and the other end of the second ceramic capacitor C2 is connected to the first signal ground GND-1. In this embodiment, the 232 communication chip U1 is an isolated data conversion chip, the model is ADM3251EARWZ-RE, and the 232 isolation circuit converts the 232 signal of the 232 connection terminal P2 into a TTL level signal through the communication chip U1, where the 232 signal is divided into a transmitting driver TX and a receiving driver RX, and the TTL level signal is also divided into the transmitting driver TX and the receiving driver RX and connected to the 232 connection terminal P2 for output.
The 485 isolation circuit is used for converting the 485 differential signal into an isolated TTL level signal, transmitting the isolated TTL level signal to the 232 isolation circuit, converting the isolated TTL level signal into an isolated 232 level signal and outputting the isolated 232 level signal, and therefore conversion from a 485 bus to a 232 bus is achieved. Specifically, the model of the 485 communication chip U2 is TD51S485HC, the 485 isolation circuit includes a 485 communication chip U2, an eighth ceramic capacitor C8, a ninth ceramic capacitor C9, a tenth ceramic capacitor C10, an eleventh ceramic capacitor C11, a twelfth ceramic capacitor C12, a thirteenth ceramic capacitor C13, a 485 connection terminal P3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a triode Q1, a pin 1 of the 485 communication chip U2 is connected with one end of the eleventh ceramic capacitor C11, one end of the tenth ceramic capacitor C10 and one end of the third resistor R3 respectively and then connected with a 5V working voltage, a pin 2 of the 485 communication chip U2 is connected to a power ground GND and connected with the other end of the eleventh ceramic capacitor C11 and the other end of the tenth ceramic capacitor C10 respectively, the pin 3 of the 485 communication chip U2 is respectively connected with the other end of a third resistor R3 and the pin 9 of a 232 communication chip U1, the pin 4 and the pin 5 of the 485 communication chip U2 are respectively connected with the collector of a triode Q1 and one end of a sixth resistor R6, the other end of the sixth resistor R6 is connected with a 5V working voltage, the pin 6 of the 485 communication chip U2 is respectively connected with the pin 8 of the 232 communication chip U1 and one end of an eighth resistor R8, the other end of the eighth resistor R8 is connected with the base of the triode Q1, the emitter of the triode Q1 is connected with a power ground GND, the pin 7 and the pin 8 of the 485 communication chip U2 are connected with the power ground GND, the pin 9 of the 485 communication chip U2 is connected with a second signal ground GND-2, the pin 12 of the 485 communication chip U2 is respectively connected with one end of a thirteenth ceramic capacitor C13, one end of a seventh resistor R7, one end of a fourth resistor R4 and one end of a fifth resistor R5, the other end of the thirteenth ceramic capacitor C13 is connected to a second signal ground GND-2, the other end of the fifth resistor R5 is connected to a pin 2 of a 485 connection terminal P3, the other end of the seventh resistor R7 is connected to a pin 16 of a 485 communication chip U2, the pin 13 of the 485 communication chip U2 is connected to one end of a ninth ceramic capacitor C9, one end of a first resistor R1, one end of a second resistor R2 and the other end of a fourth resistor R4, the other end of the ninth ceramic capacitor C9 is connected to a second signal ground GND-2, the other end of the first resistor R1 is connected to the second signal ground GND-2, the other end of the second resistor R2 is connected to a pin 1 of the connection terminal P3, a pin 15 of the 485 communication chip U2 is connected to one end of a twelfth ceramic capacitor C12 and one end of an eighth ceramic capacitor C8, and then to the second signal ground GND-2, and a pin 16 of the 485 communication chip U2 is connected to the other end of a twelfth ceramic capacitor C12, the other end of the eighth ceramic capacitor C8 and a pin 3-P3. In this embodiment, when the half-duplex TTL level signal needs to be converted into the 485 signal, the received driver signal is pulled up by the third resistor R3 before being transmitted to the pin 3 of the 485 communication chip U2, so as to ensure the level driving capability. When the sending driver has signal transmission, the triode Q1 is conducted, and the pin 4 and the pin 5 of the 485 communication chip U2 are pulled down, so that the data sending function is realized. The pin 12 of the 485 communication chip U2 is a receiving circuit A connected with the differential driver, the pin 13 is a transmitting circuit B connected with the differential driver, the level of the pin 16 of the 485 communication chip U2 is used as a reference at the secondary end, the pin 9 of the 485 communication chip U2 is used as a signal reference, the receiving circuit A is connected with a seventh resistor R7 to pull up the level, the transmitting circuit B is connected with a first resistor R1 to pull down the level, and the middle of the transmitting circuit B is connected with a fourth resistor R4 to form a 485 differential signal. The resistance values of the first resistor R1 and the seventh resistor R7 are 120-380 omega, and the resistance value of the fourth resistor R4 is 120 omega.
Preferably, in the present embodiment, in order to ensure the reliability of the signal, the electrostatic discharge chip U3 is connected to both the receiving path a and the transmitting path B, and the reliability of the 485 signal is ensured when there is electrostatic interference in the circuit. Specifically, a pin 1 of the electrostatic discharge chip U3 is connected to a pin 2 of the 485 connection terminal P3, a pin 2 of the electrostatic discharge chip U3 is connected to a pin 1 of the 485 connection terminal P3, and a pin 3 of the electrostatic discharge chip U3 is connected to the second signal ground GND-2.
With reference to fig. 1 to 5, the specific principle of the RS-232 and RS-485 isolation type communication relay module of the present embodiment is as follows:
under the normal working condition of the 232 communication chip U1 and the 485 communication chip U2, the 232 signal connected by the 232 wiring terminal P2 can mutually convert the 232 level signal and the TTL level signal through the 232 communication chip U1; the 485 differential signal connected by the 485 wiring terminal P3 can convert the 485 differential signal and the TTL level signal into each other through the 485 communication chip U2, so that the 485 differential signal and the 232 signal are converted into each other. By adopting the 232 isolating circuit and the 485 isolating circuit, the 232 bus, the 485 bus and the power supply signal are isolated from each other, and the mutual conversion between the RS485 signal and the RS232 signal in the transmission process can be stably and reliably completed.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An RS-232 and RS-485 isolated communication relay module, characterized by comprising: the power supply circuit comprises a power supply circuit, a 232 isolating circuit and a 485 isolating circuit;
the power supply circuit is respectively connected with the 232 isolation circuit and the 485 isolation circuit and supplies power to the 232 isolation circuit and the 485 isolation circuit;
the 232 isolation circuit is used for converting an externally input 232 level signal into an isolated TTL level signal and then transmitting the isolated TTL level signal to the 485 isolation circuit, converting the isolated TTL level signal into an isolated 485 differential signal level through the 485 isolation circuit and outputting the level to the outside, so that the conversion from the 232 bus to the 485 bus is realized;
the 485 isolation circuit is used for converting the 485 differential signal into an isolated TTL level signal, transmitting the isolated TTL level signal to the 232 isolation circuit, converting the isolated TTL level signal into an isolated 232 level signal and outputting the isolated 232 level signal, and therefore conversion from a 485 bus to a 232 bus is achieved.
2. The RS-232 and RS-485 isolation type communication relay module of claim 1, wherein: the power supply circuit comprises a first wiring terminal (P1), a voltage stabilizing diode (D1), a first ceramic capacitor (C1) and an electrolytic capacitor (E1), wherein a pin 1 of the first wiring terminal (P1) is connected with the anode of the voltage stabilizing diode (D1), one end of the first ceramic capacitor (C1) and the cathode of the electrolytic capacitor (E1) respectively, a pin 2 of the first wiring terminal (P1) is connected with the cathode of the voltage stabilizing diode (D1), the other end of the first ceramic capacitor (C1) and the anode of the electrolytic capacitor (E1) respectively, the pin 1 of the first wiring terminal (P1) is connected with a power Ground (GND), and the pin 2 of the first wiring terminal (P1) is connected with a 5V working voltage.
3. An RS-232 and RS-485 isolation type communication relay module according to claim 2, wherein: the 232 isolation circuit comprises a 232 communication chip (U1), a second ceramic capacitor (C2), a third ceramic capacitor (C3), a fourth ceramic capacitor (C4), a fifth ceramic capacitor (C5), a sixth ceramic capacitor (C6), a seventh ceramic capacitor (C7) and a 232 connection terminal (P2), a 5V working voltage is connected to a pin 2 of the 232 communication chip (U1) after being connected with a pin 3, and a power Ground (GND) is connected through the fourth ceramic capacitor (C4), the pin 4, the pin 5, the pin 6 and the pin 7 of the 232 communication chip (U1) are connected with the other end of the fourth ceramic capacitor (C4) and then connected with the GND, a pin 10 of the 232 communication chip (U1) is connected with the GND, a pin 11 of the 232 communication chip (U1) is connected with one end of the seventh ceramic capacitor connection terminal (C7) and then connected with a first signal ground (GND-1), a pin 12 of the 232 communication chip (U1) is connected with the other end of the seventh ceramic capacitor (C7), a pin 13 of the pin (U1) is connected with a pin 2 of the sixth ceramic capacitor (C6) and a pin 13 of the pin (P2) of the chip (U1, a pin 2) is connected with a pin 2 of the pin (P2) of the chip (C2) of the pin (C2) of the chip (U1) and a pin (C2) of the pin (2) of the chip (C2) of the chip (U1, the pin 3 of the first wiring terminal (P1) is connected with a first signal ground (GND-1), the pin 17 of the 232 communication chip (U1) is connected with one end of a fifth ceramic capacitor (C5), the pin 18 of the 232 communication chip (U1) is connected with the other end of the fifth ceramic capacitor (C5), the pin 19 of the 232 communication chip (U1) is connected with one end of a third ceramic capacitor (C3), the pin 20 of the 232 communication chip (U1) is respectively connected with the other end of the third ceramic capacitor (C3) and one end of a second ceramic capacitor (C2), and the other end of the second ceramic capacitor (C2) is connected with the first signal ground (GND-1).
4. The RS-232 and RS-485 isolation type communication relay module of claim 3, wherein: the 485 isolation circuit comprises a 485 communication chip (U2), an eighth ceramic capacitor (C8), a ninth ceramic capacitor (C9), a tenth ceramic capacitor (C10), an eleventh ceramic capacitor (C11), a twelfth ceramic capacitor (C12), a thirteenth ceramic capacitor (C13), a 485 connection terminal (P3), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8) and a triode (Q1), wherein a pin 1 of the 485 communication chip (U2) is connected with one end of the eleventh ceramic capacitor (C11), one end of the tenth ceramic capacitor (C10) and one end of the third resistor (R3) respectively and then is connected with a 5V working voltage, a pin 2 of the 485 communication chip (U2) is connected with a power source Ground (GND) and is connected with the other end of the eleventh ceramic capacitor (C11) and the other end of the tenth ceramic capacitor (C10), a pin 2 of the 485 communication chip (U2) is connected with the sixth ceramic capacitor (R6) and a collector terminal (R1) of the 485 communication chip (R2) and a resistor (Q1) is connected with the sixth ceramic capacitor (R6) and a GND, and a collector (R2) of the chip (2) is connected with the chip (2) and a resistor (R2) and a resistor (2) respectively, pin 6 of the 485 communication chip (U2) is connected with pin 8 of the 232 communication chip (U1) and one end of an eighth resistor (R8) respectively, the other end of the eighth resistor (R8) is connected with the base of a triode (Q1), the emitter of the triode (Q1) is connected with a power Ground (GND), pin 7 of the 485 communication chip (U2) is connected with pin 8 and then connected with a power Ground (GND), pin 9 of the 485 communication chip (U2) is connected with a second signal ground (GND-2), pin 12 of the 485 communication chip (U2) is connected with one end of a thirteenth ceramic capacitor (C13), one end of a seventh resistor (R7), one end of a fourth resistor (R4) and one end of a fifth resistor (R5) respectively, the other end of the thirteenth ceramic capacitor (C13) is connected with a second signal ground (GND-2), the other end of the fifth resistor (R5) is connected with pin 2 of a connecting terminal (P3), the other end of the seventh resistor (R7) is connected with pin 2 of the second ceramic capacitor (R2), the other end of the 485 communication chip (U2) is connected with the ninth ceramic capacitor (R2), the other end of the ninth capacitor (R2) is connected with the first resistor (R1) and the second signal ground (R2), the other end of the ninth capacitor (R2) is connected with the ninth capacitor (R2) The other end of the second resistor (R2) is connected with a pin 1 of a 485 connecting terminal (P3), a pin 15 of the 485 communication chip (U2) is connected with one end of a twelfth ceramic capacitor (C12) and one end of an eighth ceramic capacitor (C8) respectively and then connected with a second signal ground (GND-2), a pin 16 of the 485 communication chip (U2) is connected with the other end of the twelfth ceramic capacitor (C12) and the other end of the eighth ceramic capacitor (C8) respectively, and a pin 3 of the 485 connecting terminal (P3) is connected with the second signal ground (GND-2).
5. The RS-232 and RS-485 isolation type communication relay module according to claim 4, wherein: the 485 isolating circuit further comprises an electrostatic discharge chip (U3), a pin 1 of the electrostatic discharge chip (U3) is connected with a pin 2 of the 485 wiring terminal (P3), the pin 2 of the electrostatic discharge chip (U3) is connected with the pin 1 of the 485 wiring terminal (P3), and the pin 3 of the electrostatic discharge chip (U3) is connected with a second signal ground (GND-2).
6. The RS-232 and RS-485 isolation type communication relay module of claim 3, wherein: the model of the 232 communication chip (U1) is ADM3251EARWZ-RE.
7. The RS-232 and RS-485 isolation type communication relay module according to claim 4, wherein: the model of the 485 communication chip (U2) is TD51S485HC.
8. The RS-232 and RS-485 isolation type communication relay module according to claim 4, wherein: the resistance values of the first resistor (R1) and the seventh resistor (R7) are 120-380 omega, and the resistance value of the fourth resistor (R4) is 120 omega.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222510282.2U CN218450117U (en) | 2022-09-22 | 2022-09-22 | RS-232 and RS-485 isolated communication relay module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222510282.2U CN218450117U (en) | 2022-09-22 | 2022-09-22 | RS-232 and RS-485 isolated communication relay module |
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| CN218450117U true CN218450117U (en) | 2023-02-03 |
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| CN202222510282.2U Active CN218450117U (en) | 2022-09-22 | 2022-09-22 | RS-232 and RS-485 isolated communication relay module |
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Effective date of registration: 20230524 Address after: Room 2001, 20th Floor, Building A, Mingjia Science and Technology Building, No. 99 Shengli Road, Jiangning District, Nanjing City, Jiangsu Province, 211106 Patentee after: Nanjing Hanke Mingde Medical Technology Co.,Ltd. Address before: 317317 Baita Industrial Cluster, Baita Town, Xianju County, Taizhou City, Zhejiang Province Patentee before: Zhejiang shouwo Medical Technology Co.,Ltd. |