CN112383355A - Novel RS485 changes optical fiber communication module - Google Patents
Novel RS485 changes optical fiber communication module Download PDFInfo
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- CN112383355A CN112383355A CN202011253645.8A CN202011253645A CN112383355A CN 112383355 A CN112383355 A CN 112383355A CN 202011253645 A CN202011253645 A CN 202011253645A CN 112383355 A CN112383355 A CN 112383355A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/028—Subscriber network interface devices
Abstract
The invention relates to a novel RS 485-to-optical fiber communication module, which comprises an optical fiber receiving and transmitting integrated module, an optical fiber receiving and transmitting combined module, a jumper wire unit, a logic module and a 485 communication chip, wherein the optical fiber receiving and transmitting integrated module is arranged on the optical fiber receiving and transmitting integrated module; when the single optical fiber is used for receiving and transmitting, the jumper unit is connected with the optical fiber receiving and transmitting integrated module and is connected to the 485 communication chip through the logic module; when one optical fiber receives and transmits the other optical fiber, the jumper unit is connected with the optical fiber transceiving combined module and is connected to the 485 communication chip through the logic module. The communication module has the characteristics of small volume and convenient use. The problem that the communication distance of the traditional RS485 interface is short is solved, the problems of electromagnetic interference, ground ring interference and lightning damage are solved, and the reliability of data communication is greatly improved. The method is the best choice for the quick connection of the remote terminal to the host or the distributed equipment acquisition system.
Description
Technical Field
The invention relates to the technical field of communication conversion, in particular to a novel RS 485-to-optical fiber communication module.
Background
With the increase of global energy tension, the development of new energy has become a trend. At present, the centralized communication adopted by the domestic new energy converter adopts an optical fiber communication mode, and because the traditional communication board adopts an RS485 interface as an external interface and adopts electric signal transmission, an RS 485-to-single optical fiber device needs to be additionally arranged to realize interactive communication. At present, the conversion module mostly adopts an import module, and has a complex internal structure and high price. The existing conversion module adopts the receiving and transmitting separation, the number of optical fibers is two, and the distribution wiring is not facilitated.
Aiming at the above dilemma, how to replace an import module without changing the design of a main control board and the design of a cabinet, and the technical problem of simple materials and low cost are urgent to be solved in the field.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a novel RS 485-to-optical fiber communication module. The structure that a pure analog circuit is additionally provided with a 485 chip is adopted, the receiving and transmitting enabling pin of the 485 chip is ingeniously interlocked through a triode circuit, the level of a transmitting signal is utilized to restrict the enabling pin, and the receiving and transmitting process of the 485 chip is indirectly controlled. For the optical module which is integrated with the transceiver, the same signal can be received when the optical module sends the signal, and the problem of data recovery while sending the data is solved by adopting the triode circuit, and the design is just that the half-duplex RS485 data transmission can be carried out by a single optical fiber.
In order to achieve the purpose, the invention provides a novel RS 485-to-optical fiber communication module, which comprises an optical fiber transceiving integrated module, an optical fiber transceiving combined module, a jumper wire unit, a logic module and a 485 communication chip;
when the single optical fiber is used for receiving and transmitting, the jumper unit is connected with the optical fiber receiving and transmitting integrated module and is connected to the 485 communication chip through the logic module; when one optical fiber receives and transmits another optical fiber, the jumper unit is connected with the optical fiber transceiving combined module and is connected to the 485 communication chip through the logic module;
the logic module comprises an enabling unit, a sending driving unit and a receiving driving unit;
when the 485 communication chip does not output signals to the optical fiber, the enabling unit enables the enabling end of the 485 communication chip to be arranged high, and the 485 communication chip is in a receiving state; when the 485 communication chip receives a low level signal output by a sending drive unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a sending state, and the sent data is '0'; when the 485 communication chip receives a high-level signal output by a sending driving unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a receiving state, and sent data is '1';
the optical fiber transceiving integrated module or the optical fiber transceiving combined module receives data through optical fibers, sends the data to the sending driving unit for logic reversal and then sends the data to the 485 communication chip, and the 485 communication chip outputs the data; and after the 485 communication chip receives the data, the data is output to a receiving driving unit to be reversely transmitted to the optical fiber through the optical fiber receiving and transmitting integrated module or the optical fiber receiving and transmitting combination.
Further, the enabling unit comprises a first resistor, a second resistor and a first MOS (metal oxide semiconductor) tube; the grid electrode of the first MOS tube is connected to the TTL level sending end of the 485 communication chip through a first resistor, the source electrode of the first MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the enabling end of the 485 communication chip and is connected with the positive electrode of a power supply through a second resistor.
Further, the sending driving unit comprises a third resistor, a fourth resistor, a fifth resistor and a second MOS transistor; the grid electrode of the second MOS tube is connected with the TTL level receiving end of the 485 communication chip; the third resistor is connected between the grid electrode and the drain electrode of the second MOS tube, and the source electrode of the second MOS tube is grounded; and the drain electrode of the second MOS tube is connected to the positive electrode of the power supply through a fourth resistor and a fifth resistor which are connected in parallel.
Furthermore, the receiving driving unit comprises a sixth resistor and a third MOS transistor, a gate of the third MOS transistor is connected to the TTL level transmitting end of the 485 communication chip, a source of the third MOS transistor is grounded, and a drain of the third MOS transistor is connected to the positive electrode of the power supply through the sixth resistor.
Further, the optical fiber transceiver-integrated module comprises a transceiver-integrated chip and a reverse unit;
the reverse unit receives the signal sent by the 485 communication chip through the sending driving unit, performs reverse processing and sends the signal to a receiving port of the receiving and sending integrated chip, and the signal is sent to the optical fiber by the receiving and sending integrated chip;
and the receiving and transmitting integrated chip receives the signal sent by the optical fiber, outputs the signal by an output port, and sends the signal to the receiving driving unit after being reversed by the reversing unit.
Further, the inverting unit comprises a fourth MOS transistor, a fifth MOS transistor, a seventh resistor and an eighth resistor; the grid electrode of the fourth MOS tube is connected to the output end of the sending driving unit and the receiving port of the receiving-transmitting integrated chip, the source electrode of the fourth MOS tube is grounded, and the drain electrode of the fourth MOS tube is connected with the receiving end of the receiving driving unit;
the grid electrode of the fifth MOS tube is connected with the output port of the transceiver integrated chip, the source electrode of the fifth MOS tube is grounded, and the drain electrode of the fifth MOS tube is connected with the positive electrode of a power supply through a seventh resistor; and the eighth resistor is connected between the receiving end of the receiving driving unit and the output port of the transceiving integrated chip.
Further, the optical fiber transceiving combined module comprises a receiving optical module and a transmitting optical module.
Furthermore, the RS485 optical fiber conversion communication module is arranged in the plastic shell, one side of the RS485 optical fiber conversion communication module is provided with a hanging lug, and the RS485 optical fiber conversion communication module is externally hung on the installation guide rail. The technical scheme of the invention has the following beneficial technical effects:
(1) the transmitting and receiving enable pins of the 485 chip are interlocked through the triode circuit, and the transmitting and receiving process of the 485 chip is indirectly controlled by restricting the enable pins by the level of the transmitted signal.
(2) For the optical module which is integrated with the transceiver, the same signal can be received when the optical module sends the signal, and the problem that the data is received when the data is sent is solved by adopting the triode circuit.
(3) The invention realizes the communication of two optical fibers or one optical fiber through the jumper wire, and has good compatibility. This RS485 changes optical fiber communication module's design, the communication mode of compatible single and two optic fibre, inside wire jumper cap design, under the condition that an optic fibre damaged, can set the mode of single communication rapidly.
(4) The communication module has the characteristics of small volume and convenience in use.
(5) The invention breaks through the problem of short communication distance of the traditional RS485 interface, also solves the problems of electromagnetic interference, ground ring interference and lightning destruction, and greatly improves the reliability of data communication. The method is the best choice for the quick connection of the remote terminal to the host or the distributed equipment acquisition system.
Drawings
FIG. 1 is an internal schematic diagram of an RS485 fiber conversion module;
FIG. 2 is an RS485 chip and peripheral configuration;
FIG. 3 is a schematic diagram of the inverse logic of the RO, DI signals and the TD, RD signals;
FIG. 4 is a schematic diagram of a COM pull-up of a COM enable pin controlled by DI signal data;
fig. 5 is a schematic diagram of signal transformation of TD and RD signals and Tx and Rx modules;
FIG. 6 is a composite platelet that receives and transmits;
FIG. 7 is an internal structure of a composite platelet;
FIG. 8 is a schematic view of the installation and use of an RS485 fiber conversion module;
fig. 9 is an application diagram of an RS485 to single fiber module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The invention provides a novel RS 485-to-optical fiber communication module, which is combined with a figure 1 and comprises an optical fiber receiving and transmitting module, a logic module and a 485 communication chip, wherein the definition of each pin is shown in a table 1.
Table 1:
it should be noted that, when a receiving and transmitting module loops back to connect, the receiving and transmitting logic is consistent. And TD1 is low, the light emitting tube emits light. RD1 is low after the receiving tube receives light.
As shown in fig. 1, the conversion module 1 is identical to the conversion module 2, and 2, the module has two different types of external interfaces: one is two external connectors with separated receiving and transmitting, and the other is one external connector with integrated receiving and transmitting. And 3, selecting connection according to the connection requirement of the optical fibers, and selecting the two forms by adopting a jumper cap inside the optical fiber connector.
The conversion of external wiring RS485A and RS485B signals into RD and TD signals is the signal conversion stage of 485 chips, and the signal transmission of the RD and TD signals and the rear-stage optical module is the second stage.
1. Signal conversion stage of 485 chips:
the receiving direction is defined as RS485A, RS485B signal (A, B) → RD, TD signal, and the transmitting direction is defined as RD, TD signal → RS485A, RS485B signal.
Data reception: when no data is sent, the DI1 signal defaults to high level due to the pull-up of the subsequent stage, the triode is turned on to enable the low level of the 485 chip COM1, the RO1 receives the data enable, and the data received from A, B is transmitted to the TD1 through the RO channel, so that the data receiving process is completed.
Data transmission: when data '0' is transmitted, the head of the data frame to be transmitted can make the DI signal have a pull-down level to indicate that the data transmission is started, at the moment, the triode is cut off, the COM1 is at a high level, and the transmission is enabled. When data '0' is transmitted, since the port DI1 is connected to ground, data '0' is transmitted to the port AB, a-B <0, and '0' is transmitted, completing the low level transmission. When sending '1', the DI signal is set high, the triode is conducted, COM1 is low, and receiving is enabled, but the state is determined by pulling up the pull-down resistor B by A because the DI signal is still in sending data, and the transmission of '1' is completed when A-B > 0.
2. And (3) signal transmission of RD and TD signals and a rear-stage optical module:
when RD and TD send signals 1 to the optical module: TD1 is put high, Tx1 is put high, Rx1 is put low, RD1 is put low because of being controlled by a triode, Rx2 is put low after passing through the optical fiber, RD2 is put high, and 1 transmission is completed. At this time, since TD2 is in a non-transmission state and is set low for a long time, RD2 signal is not controlled by TD2, the received high level signal is an active signal, and it should be noted that RD1 is controlled by TD1 to be set low, and data is transmitted to the optical fiber through the optical fiber.
When RD and TD send signals 0 to the optical module: RD1 is low, Tx1 is low, Rx1 is high, RD1 is low, Rx2 is high after passing through the optical fiber, RD2 is low to complete transmission, and at this time, because RD1 is still in a low level state, the low level of RD1 is ensured in the whole module 1 transmission process.
As shown in fig. 2, the periphery of the 485 chip is connected to a receiving enable terminal and a sending enable terminal, where RO is a TTL level receiving terminal, DI is a TTL level sending terminal, and A, B is a differential signal transmitting and receiving positive terminal and a differential signal receiving and sending negative terminal.
A novel RS 485-to-optical fiber communication module comprises an optical fiber receiving and transmitting integrated module, an optical fiber receiving and transmitting combined module, a jumper wire unit, a logic module and a 485 communication chip.
When the single optical fiber is used for receiving and transmitting, the jumper unit is connected with the optical fiber receiving and transmitting integrated module and is connected to the 485 communication chip through the logic module; when one optical fiber receives and transmits another optical fiber, the jumper unit is connected with the optical fiber transceiving combined module and is connected to the 485 communication chip through the logic module;
the logic module comprises an enabling unit, a sending driving unit and a receiving driving unit;
when the 485 communication chip does not output signals to the optical fiber, the enabling unit enables an enabling end (COM) of the 485 communication chip to be high, and the 485 communication chip is in a receiving state; when the 485 communication chip receives a low level signal output by a sending drive unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a sending state, and the sent data is '0'; when the 485 communication chip receives a high-level signal output by a sending driving unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a receiving state, and sent data is '1';
the optical fiber transceiving integrated module or the optical fiber transceiving combined module receives data through optical fibers, sends the data to the sending driving unit for logic reversal and then sends the data to the 485 communication chip, and the 485 communication chip outputs the data; and after the 485 communication chip receives the data, the data is output to a receiving driving unit to be reversely transmitted to the optical fiber through the optical fiber receiving and transmitting integrated module or the optical fiber receiving and transmitting combination.
With reference to fig. 3, the transmitting driving unit includes a third resistor R11, a fourth resistor R12, a fifth resistor R13, and a second MOS transistor Q2; the grid electrode of the second MOS tube Q2 is connected with a TTL level receiving end RO of the 485 communication chip; the third resistor R11 is connected between the gate and the drain of the second MOS transistor Q2, and the source of the second MOS transistor Q2 is grounded; the drain of the second MOS transistor Q2 is connected to the positive power supply via a fourth resistor R12 and a fifth resistor R13 connected in parallel. The receiving driving unit comprises a sixth resistor R9 and a third MOS tube Q1, the grid electrode of the third MOS tube Q1 is connected with the TTL level sending end DI of the 485 communication chip, the source electrode of the third MOS tube Q1 is grounded, and the drain electrode of the third MOS tube Q1 is connected to the positive electrode of the power supply through a sixth resistor R9.
With reference to fig. 4, the enable unit includes a first resistor R14, a second resistor R3, and a first MOS transistor Q3; the grid electrode of the first MOS tube Q3 is connected to the TTL level sending end DI of the 485 communication chip through a first resistor R14, the source electrode of the first MOS tube Q3 is grounded, and the drain electrode of the first MOS tube Q3 is connected with the enabling end COM of the 485 communication chip and is connected with the positive electrode of a power supply through a second resistor R3.
Referring to fig. 5, the optical transceiver module includes a transceiver chip U3 and a reversing unit;
the reverse unit receives the signal sent by the 485 communication chip through the sending driving unit, performs reverse processing on the signal and sends the signal to a receiving port TX of the integrated transceiving chip U3, and the signal is sent to an optical fiber by the integrated transceiving chip U3;
after receiving the signal sent by the optical fiber, the transceiver integrated chip U3 is output by the output port RX, and is sent to the receiving driving unit after being inverted by the inverting unit.
The inversion unit comprises a fourth MOS transistor Q7, a fifth MOS transistor Q6, a seventh resistor R5 and an eighth resistor R4; the grid electrode of the fourth MOS transistor Q7 is connected to the output end TD of the transmitting driving unit and the receiving port TX of the transceiver integrated chip U3, the source electrode of the fourth MOS transistor Q1 is grounded, and the drain electrode of the fourth MOS transistor Q1 is connected to the receiving end RD of the receiving driving unit;
the grid electrode of the fifth MOS tube Q6 is connected with an output port RX of the transceiver integrated chip U3, the source electrode of the fifth MOS tube Q6 is grounded, and the drain electrode of the fifth MOS tube Q6 is connected with the positive electrode of a power supply through a seventh resistor R5; the eighth resistor R4 is connected between the receiving terminal RD of the receiving driving unit and the output port RX of the transceiver chip U3.
With reference to fig. 6, the optical fiber transceiving combined module includes a receiving optical module and a transmitting optical module to form a combined small circuit board, which is beneficial to the compatible design of other products.
Referring to fig. 7, RD 'is a receive optical module receive signal, TD' is a transmit optical module drive signal, and logic of the transmit-receive combined platelet is directly driven when the logic of RD 'and TD' is consistent, and no special logic processing is required. AFBR-2418 chip and HFBR-1414 chip were used, respectively. With reference to fig. 8, the RS485 to single fiber module adopts a three-sided lead wire and one-sided suspension loop design. The upper terminal is used for supplying power to the module, the power supply adopts wide-range input of DC9-36V, the lower terminal is an RS485 signal line A, B which is directly connected with a 485 interface of the communication board, and a grounding terminal is reserved in addition and is used for connecting a shielding line.
Fig. 9 is an application schematic diagram, in which a monitoring host and a device are both equipped with the optical fiber communication module of the present invention to implement communication interconnection.
This RS485 changes optical fiber communication module's design, principle design benefit adopts the structure of pure analog circuit plus 485 chips, and the receiving and dispatching of 485 chips enables the pin and carries out ingenious interlocking through triode circuit, utilizes the level restriction of signal transmission self to enable the pin, and indirect control 485's receiving and dispatching process. For the optical module which is integrated with the transceiver, the same signal can be received when the optical module sends the signal, and the problem of data recovery while sending the data is solved by adopting the triode circuit, and the design is just that the half-duplex RS485 data transmission can be carried out by a single optical fiber. The system has no any main control chip and processing chip, and is controlled by using the automatic enabling of the data, so that the zero-delay conversion design is really realized, and meanwhile, the power consumption and the heating problem of the module are greatly reduced. External dial configuration is not needed, plug and play are realized, conversion is rapid, and the error rate is low.
This RS485 changes fiber communication module's design, the mode that adopts single optic fibre to carry out data communication to the external interface, and the receiving and dispatching of data multiplexes an optical fiber splice. The type of the optical fiber is not limited to a certain material, and the external interface is not limited to a certain fixed form of the optical fiber connection joint. The winding has been avoided to single optic fibre, when practicing thrift optic fibre, also very big saving the cabinet space wire casing space, make the inside wiring of regulator cubicle clearer.
This RS485 changes optical fiber communication module's design, the shell adopts one shot forming mould, takes the buckle design certainly, need not the screw and can fast assembly. The back is from taking the guide rail fixer, can easily realize articulating the guide rail operation, very big saving the cabinet space, reducing the technical degree of difficulty of installation.
The new energy power station equipment is dispersed, the converter needs to be communicated with a control room through RS485 signals when being connected to the grid, when the distance is long, the RS485 attenuation is seriously interrupted, the RS485 to optical fiber communication module can convert the RS485 signals at the two ends of the converter and the control room into optical signals, and long-distance communication transmission is realized through an optical fiber connection mode.
In summary, the present invention relates to a novel RS 485-to-fiber communication module, which includes an optical fiber transceiving module, an optical fiber transceiving combined module, a jumper unit, a logic module, and a 485 communication chip; when the single optical fiber is used for receiving and transmitting, the jumper unit is connected with the optical fiber receiving and transmitting integrated module and is connected to the 485 communication chip through the logic module; when one optical fiber receives and transmits the other optical fiber, the jumper unit is connected with the optical fiber transceiving combined module and is connected to the 485 communication chip through the logic module. The communication module has the characteristics of small volume and convenient use. The problem that the communication distance of the traditional RS485 interface is short is solved, the problems of electromagnetic interference, ground ring interference and lightning damage are solved, and the reliability of data communication is greatly improved. The method is the best choice for the quick connection of the remote terminal to the host or the distributed equipment acquisition system.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A novel RS 485-to-optical fiber communication module is characterized by comprising an optical fiber receiving and transmitting integrated module, an optical fiber receiving and transmitting combined module, a jumper wire unit, a logic module and a 485 communication chip;
when the single optical fiber is used for receiving and transmitting, the jumper unit is connected with the optical fiber receiving and transmitting integrated module and is connected to the 485 communication chip through the logic module; when one optical fiber receives and transmits another optical fiber, the jumper unit is connected with the optical fiber transceiving combined module and is connected to the 485 communication chip through the logic module;
the logic module comprises an enabling unit, a sending driving unit and a receiving driving unit;
when the 485 communication chip does not output signals to the optical fiber, the enabling unit enables an enabling end (COM) of the 485 communication chip to be high, and the 485 communication chip is in a receiving state; when the 485 communication chip receives a low level signal output by a sending drive unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a sending state, and the sent data is '0'; when the 485 communication chip receives a high-level signal output by a sending driving unit, the enable end of the 485 communication chip is set to be low, the 485 communication chip is in a receiving state, and sent data is '1';
the optical fiber transceiving integrated module or the optical fiber transceiving combined module receives data through optical fibers, sends the data to the sending driving unit for logic reversal and then sends the data to the 485 communication chip, and the 485 communication chip outputs the data; and after the 485 communication chip receives the data, the data is output to a receiving driving unit to be reversely transmitted to the optical fiber through the optical fiber receiving and transmitting integrated module or the optical fiber receiving and transmitting combination.
2. The novel RS 485-fiber communication module according to claim 1, wherein the enabling unit comprises a first resistor (R14), a second resistor (R3) and a first MOS transistor (Q3); the grid electrode of the first MOS tube (Q3) is connected to a TTL level sending end (DI) of the 485 communication chip through a first resistor (R14), the source electrode of the first MOS tube (Q3) is grounded, and the drain electrode of the first MOS tube (Q3) is connected with an enabling end (COM) of the 485 communication chip and is connected with the positive electrode of a power supply through a second resistor (R3).
3. The novel RS 485-fiber communication module according to claim 2, wherein the transmission driving unit comprises a third resistor (R11), a fourth resistor (R12), a fifth resistor (R13) and a second MOS transistor (Q2); the grid electrode of the second MOS tube (Q2) is connected with a TTL level receiving end (RO) of the 485 communication chip; the third resistor (R11) is connected between the grid electrode and the drain electrode of the second MOS tube (Q2), and the source electrode of the second MOS tube (Q2) is grounded; the drain of the second MOS transistor (Q2) is connected to the positive electrode of the power supply through a fourth resistor (R12) and a fifth resistor (R13) which are connected in parallel.
4. The novel RS 485-to-fiber communication module according to claim 3, wherein the receiving driving unit comprises a sixth resistor (R9) and a third MOS transistor (Q1), a gate of the third MOS transistor (Q1) is connected to a TTL level transmitter (DI) of the 485 communication chip, a source of the third MOS transistor (Q1) is grounded, and a drain of the third MOS transistor (Q1) is connected to a positive power supply via the sixth resistor (R9).
5. The novel RS 485-fiber communication module according to claim 1 or 2, wherein the optical fiber transceiver-integrated module comprises a transceiver-integrated chip (U3) and a reversing unit;
the reverse unit receives the signal sent by the 485 communication chip through the sending driving unit, performs reverse processing, sends the signal to a receiving port (TX) of the integrated transceiving chip (U3), and sends the signal to an optical fiber through the integrated transceiving chip (U3);
and the receiving and transmitting integrated chip (U3) receives the signals sent by the optical fiber, outputs the signals by an output port (RX), and sends the signals to the receiving driving unit after the signals are reversed by the reversing unit.
6. The novel RS 485-fiber communication module according to claim 5, wherein the reversing unit comprises a fourth MOS transistor (Q7), a fifth MOS transistor (Q6), a seventh resistor (R5) and an eighth resistor (R4); the grid electrode of the fourth MOS tube (Q7) is connected to the output end (TD) of the sending driving unit and the receiving port (TX) of the receiving-transmitting integrated chip (U3), the source electrode of the fourth MOS tube (Q1) is grounded, and the drain electrode of the fourth MOS tube (Q1) is connected with the receiving end (RD) of the receiving driving unit;
the grid electrode of the fifth MOS tube (Q6) is connected with the output port (RX) of the transceiver integrated chip (U3), the source electrode of the fifth MOS tube (Q6) is grounded, and the drain electrode of the fifth MOS tube (Q6) is connected with the positive electrode of a power supply through a seventh resistor (R5); the eighth resistor (R4) is connected between the receiving end (RD) of the receiving driving unit and the output port (RX) of the integrated transceiver chip (U3).
7. The novel RS 485-fiber communication module according to claim 1 or 2, wherein the optical fiber transceiver module comprises a receiving optical module and a transmitting optical module.
8. The novel RS 485-fiber communication module according to claim 1 or 2, wherein the RS 485-fiber communication module is installed in a plastic shell, and a hanging lug is arranged on one surface of the RS 485-fiber communication module and hung outside on an installation guide rail.
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