CN2161025Y

CN2161025Y - Two-wire remote transmission apparatus

Info

Publication number: CN2161025Y
Application number: CN 93234013
Authority: CN
Inventors: 单建刚; 李吉绍
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-05-26
Filing date: 1993-05-26
Publication date: 1994-04-06
Anticipated expiration: 2003-05-26

Abstract

The utility model relates to a two-wire remote transmission apparatus, which is used for remote data communication among computers and among computers and peripheral devices. The circuits of the utility model is composed of an emission electrical level conversion circuit (1), an emission electrical level indication circuit (2), an amplification and drive circuit (3), a control isolation circuit (4), a channel protection network (5), a noise elimination shaping circuit (6), an acceptance circuit (7), an acceptance electrical level indication circuit (8) and an acceptance electrical level conversion circuit (9). The utility model adopts a half duplex series asynchronous communication mode and base band transmission, the transmission distance can reach 75m to 100 km, and the communication wires of the utility model adopt ordinary telephone wires and twisted pair wires. The utility model has the advantages of strong anti-interference ability, low error rate and high safety.

Description

Two-wire remote transmission apparatus

The utility model relates to a kind of for transmission channel provides multiduty digital information transmission device, further is meant a kind of two-wire system remote transmission device that adopts half-duplex serial asynchronous communication mode.

At present, carry out the special equipment of telecommunication between computer and computer and computer and ancillary equipment, its key technology is a transmission range.Yet domestic to have only transmission range be the product of 4～6KM, the representative RDS-3 type of producing for Zhejiang Province institute of computing technology.Also having only transmission range abroad is the product of 10KM, and representative is the LCM1010 type that U.S. Generol Data COmon Inc produces.Adopt baseband transmission as for transfer of data, then according to the foreign document record, critical distance is 5 miles (8KM).

The purpose of this utility model, to be to provide a kind of communication modes be that half-duplex serial asynchronous communication, transfer of data adopt baseband transmission and transmission range can reach the two-wire system remote transmission device of KM up to a hundred.

Referring to Fig. 1 the utility model electricity functional-block diagram, solution of the present utility model is as follows.Its circuit part is by launching electrical level change-over circuit (1); launching electrical level indicating circuit (2); amplification driving circuit (3); control buffer circuit (4); channel guard network (5); de-noising shaping circuit (6); receiving circuit (7); incoming level indicating circuit (8) and incoming level change-over circuit (9) are formed; the annexation of foregoing circuit and signal flow are to being; the output of launching electrical level change-over circuit (1) joins with the input of launching electrical level indicating circuit (2) and amplification driving circuit (3) and the control end of control buffer circuit (4) respectively; the input of control buffer circuit (4) is connected in the output of amplification driving circuit (3); the output of control buffer circuit (4) will have transmitting of driving power and supply with channel guard network (5); channel guard network (5) is supplied with received signal the input of de-noising shaping circuit (6); the input of the output of de-noising shaping circuit (6) and receiving circuit (7) joins, and the output of receiving circuit (7) links to each other with the input of incoming level indicating circuit (8) with incoming level change-over circuit (9) respectively.

The utility model is when concrete the use; with the identical transmitter of two covers with foregoing circuit structure; be divided in the two places of carrying out telecommunication; adopt two communication transmission lines (available plain old telephone special line or common twisted-pair wire) between two transmitters; two ends respectively with the communication transmission ends A of the channel guard network (5) of two transmitters; B links to each other; respectively the input of the launching electrical level change-over circuit (1) of each transmitter is joined with the transmitting terminal TxD of the general standard interface RS-232C of this ground computer respectively simultaneously; the output of the incoming level change-over circuit (9) of each transmitter is joined with the receiving terminal RxD of the general standard interface RS-232C of this ground computer respectively, with the circuit of each transmitter introduce bipolar power supply+Vcc that this ground computer system has and-Vcc is as working power.After having carried out above-mentioned connection, the utility model transmitter can drop into communication and use.

During work; the serial digital signal of sending from the TxD end is input to launching electrical level change-over circuit (1); transmit and after circuit (1) amplifies and carries out level conversion, divide three tunnel outputs; one the road delivers to the luminous indication that launching electrical level indicating circuit (2) is made launching electrical level; another road is delivered to amplification driving circuit (3) and is amplified and be converted to the bipolarity high level signal output with certain power; also have one the tunnel to deliver to the control end of control buffer circuit (4) as control signal; this control signal is used for Synchronization Control flows to control buffer circuit (4) from amplification driving circuit (3) the break-make that transmits; have transmitting of driving power and deliver to channel guard network (5), from its communication transmission ends A from control buffer circuit (4) output; B enters two communication transmission lines and sends the other side to.

Deliver to the communication transmission ends A of channel guard network (5) through two communication transmission lines from the serial digital signal of outer end; B; by channel guard network (5) with the signal conveys that receives to de-noising shaping circuit (6); through the de-noising shaping; make signal waveform undistorted; deliver to receiving circuit (7) by de-noising shaping circuit (6) then; received signal is divided two-way output after being converted into Transistor-Transistor Logic level here again; one the road delivers to incoming level indicating circuit (8) does the luminous indication of incoming level; incoming level change-over circuit (9) is delivered on another road; be converted to the bipolarity level and do and amplify output, send into the RxD end of computer standard interface.

The utility model is owing to adopted control buffer circuit reasonable in design, de-noising shaping circuit and amplification driving circuit in circuit structure, therefore transmission range improves greatly, can reach 75m～100km, be more convenient between computer and the computer and the telecommunication between computer and the ancillary equipment; Its communication modes adopts the half-duplex serial asynchronous communication, and transfer of data adopts baseband transmission, directly digital signal is transmitted on the line, and connection adopts ordinary telephone line or twisted-pair wire, and circuit is reduced to a pair of, and this has just reduced track investment and hardware costs; This transmitter antijamming capability is strong, the transmission rate height, and the error rate is low, and is safe and reliable.

Below in conjunction with drawings and Examples the utility model is further specified:

Fig. 1 is the utility model electricity functional-block diagram;

Fig. 2 is the schematic diagram of a kind of physical circuit of Fig. 1 block diagram.

Referring to Fig. 2, launching electrical level change-over circuit (1) is by photoelectrical coupler IC ₁, line receiver IC ₂And resistance R ₁To R ₃Form, launching electrical level indicating circuit (2) is by inverter ic ₄, LED ₁And resistance R ₄Form, amplification driving circuit (3) comprises by line drive IC ₃, diode D ₁, resistance R ₆And capacitor C ₄The line drive circuit of forming and by triode BG ₁With BG ₂And resistance R ₇With R ₈The complementary emitter follower of forming, control buffer circuit (4) comprises by time-base integrated circuit IC ₅, resistance R ₅And capacitor C ₁To C ₃The time base control circuit of forming and by linear isolator IC ₆And resistance R ₉The circuit linearity insulating circuit of forming, channel guard network (5) is by surge suppressor TVP ₁With TVP ₂, voltage-stabiliser tube DW ₁With DW ₂, piezo-resistance Rv and capacitor C ₅To C ₇Form, de-noising shaping circuit (6) is by XOR gate IC ₇, flip and flop generator IC ₈, NOR gate IC ₉, d type flip flop IC ₁₀, integrated transporting discharging IC ₁₁, resistance R ₁₀To R ₁₄And capacitor C ₈To C ₁₀Form, receiving circuit (7) is by line receiver IC ₁₂And resistance R ₁₅Form, incoming level indicating circuit (8) is by inverter ic ₁₃, LED ₂And resistance R ₁₆Form, incoming level change-over circuit (9) is by line drive IC ₁₄, photoelectrical coupler IC ₁₅And resistance R ₁₇To R ₂₂Form.

In conjunction with Fig. 2, below the principal character of this transmitter circuit is done the analysis in a step: 1. owing to adopt photoelectrical coupler IC ₁With IC ₁₅To carry out insulation blocking between computer and the transmitter,, also improved the antijamming capability of channel simultaneously so improved the coefficient of safety of computer.2. from IC ₂The TTL signal of output is delivered to IC ₅Carry out level ratio after, go control IC again ₆, make IC ₆Abundant conducting when sending signal, the degree of depth is ended when stopping paying out signal, realize Synchronization Control, both guaranteed that signal entered channel linearly synchronously when transmitting, have driving power, guarantee that again signal is unattenuated and undistorted when received signal, thereby improve transmission range greatly, reduce the error rate, improve reliability.3. owing to be telecommunication, line transmission signals waveform will produce distortion, distortion, or be loaded with various noise jamming compositions, and through IC ₇To IC ₁₁Various interference of noise can be effectively eliminated in the processing of the de-noising shaping circuit of being formed, and distorted waveform is carried out shaping, make signal output waveform keep original shape, and have improved Frequency Response, thereby reduce the error rate significantly.4. lead in the protecting network at letter, high-effect surge suppressor---TVP device has been installed respectively between two transmission lines and the earth, this device volume is little, power is big, response speed height, noiseless, moment can absorb the surge power up to number KW, is the anti-lightning strike effective measure of disturbing with overcurrent proof; Be provided with piezo-resistance and make auxiliary protection, eliminated the induction high pressure on the transmission line, with protection communication interface circuit; Adopt the double voltage stabilizing tube clamp, further eliminate overvoltage; Low pass filter is set, has eliminated High-frequency Interference effectively, improved reliability.5. adopt bipolar power supply+Vcc and-Vcc, complementary emitter follower is set, on the basis of line drive, increase power output again, improved transmission range effectively.6. adopt baseband transmission, and make channel have certain DC component, can eliminate effects of distribution parameters on the channel effectively.Correctly choose component parameter, the direct current on the strict control channel can make transmission range reach in various degree requirement, has improved antijamming capability and transmission rate simultaneously, has reduced the error rate effectively.

Line receiver IC ₂And IC ₁₂Model all can adopt MC1489, line drive IC ₃And IC ₁₄Model all can adopt MC1488, linear isolator IC ₆Model can adopt MCL-723C, surge suppressor TVP ₁And TVP ₂Model all can adopt SA24.0A.Line receiver, line drive, linear isolator and surge suppressor are the international uniform title.

This transmitter has carried out data communication on the spot in the 30km section, satisfies technical indicator; Carry out simulation test at 30km～100km, reached specification requirement.

Claims

1; a kind of two-wire system remote transmission device; it is characterized in that; circuit part is by launching electrical level change-over circuit (1); launching electrical level indicating circuit (2); amplification driving circuit (3); control buffer circuit (4); channel guard network (5); de-noising shaping circuit (6); receiving circuit (7); incoming level indicating circuit (8) and incoming level change-over circuit (9) are formed; the output of launching electrical level change-over circuit (1) joins with the input of launching electrical level indicating circuit (2) and amplification driving circuit (3) and the control end of control buffer circuit (4) respectively; the input of control buffer circuit (4) is connected in the output of amplification driving circuit (3); the output of control buffer circuit (4) will have transmitting of driving power and supply with channel guard network (5); channel guard network (5) is supplied with received signal the input of de-noising shaping circuit (6); the input of the output of de-noising shaping circuit (6) and receiving circuit (7) joins, and the output of receiving circuit (7) links to each other with the input of incoming level indicating circuit (8) with incoming level change-over circuit (9) respectively.

2, two-wire system remote transmission device as claimed in claim 1 is characterized in that, launching electrical level change-over circuit (1) is by photoelectrical coupler IC ₁, line receiver IC ₂And resistance R ₁To R ₃Form, launching electrical level indicating circuit (2) is by inverter ic ₄, LED ₁And resistance R ₄Form, amplification driving circuit (3) comprises by line drive IC ₃, diode D ₁, resistance R ₆And capacitor C ₄The line drive circuit of forming and by triode BG ₁With BG ₂And resistance R ₇With R ₈The complementary emitter follower of forming, control buffer circuit (4) comprises by time-base integrated circuit IC ₅, resistance R ₅And capacitor C ₁To C ₃The time base control circuit of forming and by linear isolator IC ₆And resistance R ₉The circuit linearity insulating circuit of forming, channel guard network (5) is by surge suppressor TVP ₁With TVP ₂, voltage-stabiliser tube DW ₁With DW ₂, piezo-resistance Rv and capacitor C ₅To C ₇Form, de-noising shaping circuit (6) is by XOR gate IC ₇, flip and flop generator IC ₈, NOR gate IC ₉, d type flip flop IC ₁₀, integrated transporting discharging IC ₁₁, resistance R ₁₀To R ₁₄And capacitor C ₈To C ₁₀Form, receiving circuit (7) is by line receiver IC ₁₂And resistance R ₁₅Form, incoming level indicating circuit (8) is by inverter ic ₁₃, LED ₂And resistance R ₁₆Form, incoming level change-over circuit (9) is by line drive IC ₁₄, photoelectrical coupler IC ₁₅And resistance R ₁₇To R ₂₂Form.