CN216216903U - Anti-interference 32 way RS422 serial ports optical transmitter and receiver - Google Patents

Abstract

The utility model discloses an anti-interference 32-channel RS422 serial port optical transceiver, and relates to the technical field of RS422 serial port optical transceivers. The utility model comprises an RS422 serial port optical transmitter and receiver, which consists of a transmitter and a receiver; the transmitter and the receiver comprise a power supply input and output end, an RS422 signal input and output end, an optical module and a power supply module; the power supply module consists of a first switching power supply module and a second switching power supply module, wherein the first switching power supply module is a switching power supply module for converting 5V into 3.3V, and the second switching power supply module is a switching power supply module for converting 5V into 1.8V; the optical module of the transmitter adopts the optical module of the single-fiber bidirectional and FC interface of T1310/R1550, and the optical module of the receiver adopts the optical module of the single-fiber bidirectional and FC interface of T1550/R1310. The utility model can realize the real-time transmission of 32 RS422 serial port signals, has small delay and higher self-adaptive rate, can realize the full-duplex communication of the RS422 signals, has the mutual independence of the 32 RS422 signals and effectively avoids the interference among multiple paths of signals.

Description

Anti-interference 32 way RS422 serial ports optical transmitter and receiver

Technical Field

The utility model belongs to the technical field of RS422 serial port optical transceivers, and particularly relates to an anti-interference 32-path RS422 serial port optical transceiver.

Background

The anti-interference multi-channel serial port optical transmitter and receiver comprises a transmitter and a receiver and completes the function of electric-optical and optical-electric conversion. The optical fiber transmission has the advantages of small attenuation, wide frequency band, strong anti-interference performance, high safety performance, small volume, light weight and the like, so the optical fiber transmission has incomparable advantages in the aspects of long-distance transmission, special environment and the like, and has wide application in the field of modern communication. The RS422 electrical interface is adopted in the electrical signal transmission, the characteristics of full duplex, difference and simple electrical structure are achieved, and the ADI company's electrical interface is adopted in the electrical interface design

The technique integrates a three-channel isolator, a tri-state differential line driver, a differential input receiver, and an isoPower DC/DC converter in a single package. The device adopts a 5V or 3.3V single power supply to supply power, thereby realizing a completely isolated solution, and the integration level is higher than the optical isolation speed, and the speed can reach 16Mbps at most.

However, in the process of implementing the embodiment of the present invention, the inventor finds that the existing RS422 serial port optical transceiver still has the following disadvantages: (1) the real-time transmission of signals is inconvenient, the delay time is long, and the self-adaptive rate is low; (2) the environmental adaptability is poor, and the method is not suitable for application in complex electrical environments; (3) the structure size is great, and weight is great, and the later maintenance is inconvenient and need program. Therefore, an anti-interference 32-channel RS422 serial port optical transceiver and an implementation method thereof are designed to solve the technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anti-interference 32-channel RS422 serial port optical transceiver which can realize full duplex and anti-interference optical fiber communication of 32-channel RS422 serial port signals, and can meet the requirements of RS422 serial port communication in most fields without programmable logic chips such as FPGA, CPLD and the like.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model relates to an anti-interference 32-channel RS422 serial port optical transceiver, which consists of a transmitter and a receiver; the transmitter and the receiver comprise a power supply input and output end, an RS422 signal input and output end, an optical module and a power supply module; the power supply module consists of a first switching power supply module and a second switching power supply module, wherein the first switching power supply module is a 5V-to-3.3V switching power supply module, and the second switching power supply module is a 5V-to-1.8V switching power supply module; the optical module of the transmitter adopts an optical module of a single-fiber bidirectional and FC interface of T1310/R1550, and the optical module of the receiver adopts an optical module of a single-fiber bidirectional and FC interface of T1550/R1310; the transmitter further includes a SerDes module for serialization of multiple signals; the receiver further comprises a deserializer for signal recovery.

Further, the first switching power supply module converts 5V voltage into 3.3V voltage, and the elements supplied with the 3.3V voltage include an RS422 signal transceiver chip, a SerDes chip, an optical module, and a crystal oscillator.

Further, the second switch power supply module converts the 5V voltage into the 1.8V voltage, and the 1.8V voltage is supplied to the core voltage of the SerDes chip.

Further, a chip adopted by the RS422 signal receiving and sending module of the RS422 serial port optical transceiver is a fully integrated isolated data transceiver.

The utility model has the following beneficial effects:

1. the utility model can realize the real-time transmission of 32 RS422 serial port signals, has small delay and higher self-adaptive rate, can realize the full-duplex communication of the RS422 signals, has the mutual independence of the 32 RS422 signals and effectively avoids the interference among multiple paths of signals.

2. The implementation method is stable and reliable, can be applied to complex electrical environments, has strong environmental adaptability, and can be applied to the environment of-40-75 ℃; the fixing mode is stable and reliable, and the transmitter and the receiver can be flexibly configured.

3. The utility model has small structure size, light weight, simple and convenient later maintenance and no programming.

Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of the circuit of the present invention.

Fig. 2 is a schematic diagram of the circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the utility model is an anti-interference 32-channel RS422 serial port optical transceiver, which is composed of a transmitter and a receiver; the transmitter and the receiver comprise a power input and output end, an RS422 signal input and output end, an optical module and a power module; except the optical module, the transmitter and the receiver have consistent structural size, appearance installation form and electrical characteristics, and are more convenient to produce and debug;

the power supply module consists of a first switching power supply module and a second switching power supply module, wherein the first switching power supply module is a switching power supply module for converting 5V into 3.3V, and the second switching power supply module is a switching power supply module for converting 5V into 1.8V;

the power module chip adopts an LMR14050SDDA chip, can support 5-24V voltage input, can output 6A current at most, and can output 3.3V and 1.8V voltage for a transmitter and a receiver to use through the configuration of a feedback resistor;

the optical module of the transmitter adopts an optical module of a single-fiber bidirectional and FC interface of T1310/R1550, the rate is 2.5Gbps, and the optical module of the receiver adopts an optical module of a single-fiber bidirectional and FC interface of T1550/R1310; the packaging size is 1 × 9 packaging size which is commonly used, and the optical module occupies small space and has low power consumption. Optical modules are used in a matched mode;

the transmitter also comprises a SerDes module which is used for serializing the multipath signals; the receiver also comprises a deserializer for signal recovery; the SerDes module adopts MAX9259 and MAX9260 chips of MAXIM company, under 32bit width, the maximum LVTTL speed supported by the chips can reach 78Mhz, the bit width can support the serialization requirement of 32-path LVTTL, and the adopted coding format is 8b/10b, and the chip can be butted with an optical module.

Preferably, the first switching power supply module converts 5V voltage into 3.3V voltage, and the elements supplied with 3.3V voltage include an RS422 signal transceiver chip, a SerDes chip, an optical module and a crystal oscillator; an active 50Mhz crystal oscillator is adopted to provide a Serder chip and a packaging and unpacking clock.

Preferably, the second switching power supply module converts the 5V voltage into the 1.8V voltage, and the 1.8V voltage is supplied to the SerDes chip core voltage.

Preferably, the chip adopted by the RS422 signal receiving and transmitting module of the RS422 serial port optical transceiver is ADM2582E, and the transceiver is a completely integrated isolated data transceiver with a ± 15kV ESD protection function, which is already in mass production, has high speed, small volume and high isolation, and can be applied in a complex electrical environment.

An implementation method of an anti-interference 32-path RS422 serial port optical transceiver comprises the following steps:

firstly, an RS422 signal of a client sending end enters a transmitter through a J30J connector after being sent, and the RS422 differential signal is converted into an LVTTL single-ended signal after the signal conversion from differential to single-ended is carried out;

secondly, after the LVTTL single-ended signal enters a time division multiplexing serial chip in a SerDes module, serialization of a plurality of LVTTL signals is realized, an interface level CML after serialization is consistent with an interface level CML of an optical module of a transmitter, coding formats all adopt 8b/10b coding formats, and electro-optic conversion can be directly carried out;

thirdly, after the serialized signals pass through an optical module of the transmitter, converting the electric signals into optical signals and sending out the optical signals;

and fourthly, after receiving the optical signal, the receiver performs photoelectric conversion to convert the optical signal into an electrical signal, realizes signal reduction after the electrical signal enters a deserializer of the receiver, and converts the signal into an RS422 signal after single-end conversion differential signal processing.

The RS422 signal of the client sending end is sent to the transmitter, the transmitter sends the optical signal to the receiver through the FC optical fiber adapter, and the received electrical end restores the RS422 signal, so that the optical fiber transmission function of the RS422 signal is realized; meanwhile, after receiving the RS422 signals, the receiver can also send the signals to the sending end in the same processing mode, so that full-duplex communication of the RS422 signals is realized, and 32 paths of RS422 signals are independent.

Preferably, the fourth step comprises the following specific steps:

after receiving the optical signal, the receiver performs photoelectric conversion, converts the optical signal into an electrical signal, the signal form is still the CML level standard, the CML signal enters the corresponding deserializer and is restored into 32-path LVTTL signals, and then the LVTTL signals are subjected to single-end conversion difference and are converted into the RS422 signal form.

In order to cause the local circuit board temperature to be too high and even exceed the upper limit of the working temperature of a certain device, the utility model adopts the following thermal design:

1. to avoid the placement of the chips in a bundled mode, the more uniform the chips are, the better the connection between MX9259 and MAX9260 bottom heat dissipation and the whole copper clad plate is increased;

2. the large-area ground is the ground layer, except the through holes, and the ground of the full plate. The heat is convenient to be uniformly conducted;

3. the through hole, the shell and the J30J socket are connected with the ground in the largest area as possible, so that heat is conveniently led out;

4. other power supply parts also need to be provided with holes on the back, large-area grounding, and copper laying on the bottom layer of the upper layer as much as possible and exposing copper.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims (4)

1. The utility model provides an anti-interference 32 way RS422 serial ports optical transmitter and receiver which characterized in that: the RS422 serial port optical transmitter and receiver consists of a transmitter and a receiver;

the transmitter and the receiver comprise a power supply input and output end, an RS422 signal input and output end, an optical module and a power supply module;

the power supply module consists of a first switching power supply module and a second switching power supply module, wherein the first switching power supply module is a 5V-to-3.3V switching power supply module, and the second switching power supply module is a 5V-to-1.8V switching power supply module;

the optical module of the transmitter adopts an optical module of a single-fiber bidirectional and FC interface of T1310/R1550, and the optical module of the receiver adopts an optical module of a single-fiber bidirectional and FC interface of T1550/R1310;

the transmitter further includes a SerDes module for serialization of multiple signals; the receiver further comprises a deserializer for signal recovery.

2. The anti-interference 32-channel RS422 serial port optical transceiver of claim 1, wherein the components of the first switching power supply module for converting 5V voltage into 3.3V voltage and supplying 3.3V voltage comprise an RS422 signal transceiver chip, a SerDes chip, an optical module and a crystal oscillator.

3. The anti-interference 32-channel RS422 serial port optical transceiver of claim 1, wherein the second switch power supply module converts 5V voltage to 1.8V voltage, and the 1.8V voltage is supplied to SerDes chip core voltage.

4. The anti-interference 32-channel RS422 serial port optical transceiver of claim 1, wherein a chip adopted by the RS422 signal receiving and transmitting module of the RS422 serial port optical transceiver is a fully integrated isolated data transceiver.

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