CN207148811U - Parallel port monitoring device and print system - Google Patents
Parallel port monitoring device and print system Download PDFInfo
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- CN207148811U CN207148811U CN201720904909.9U CN201720904909U CN207148811U CN 207148811 U CN207148811 U CN 207148811U CN 201720904909 U CN201720904909 U CN 201720904909U CN 207148811 U CN207148811 U CN 207148811U
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Abstract
A kind of parallel port monitoring device and a kind of print system, the parallel port monitoring device include：Parallel port data transmit-receive module, for receiving parallel port data, and export parallel data corresponding with the parallel port data；Data conversion module, it is connected with the output end of the parallel port data transmit-receive module, for receiving the parallel data of the parallel port data transmit-receive module output, and the parallel data is converted into exporting by serial line interface after serial data；Switch module, one input of the switch module is used to obtain gating signal, another input is used to receive switching signal, when receiving shutdown signal, the switch module is used to block the gating signal to transmit, when receiving open signal, the switch module is used to the gating signal being converted into enable signal output.The parallel port monitoring device can monitor the parallel port data that printer is sent in print system, and started and turn off control.
Description
Technical field
It the utility model is related to electronic technology field, more particularly to a kind of parallel port monitoring device and print system.
Background technology
Existing current printer is mainly or using parallel interface as printer port, using 25 pin D row joints.And
Line interface printer is transmitted by parallel line simultaneously using 8 data, while takes 8 pins, and transmission rate is than tradition
Serial interface it is outspoken a lot, this interface is still having substantial amounts of actual use scene now.
Prior art is directly beaten print data by simultaneously port transmission in print procedure, by main frame to printer
Print, function are more single.
Some users want to data flow of the monitoring between main frame to printer in real time, to do analytic statistics use；
And also wanting to can possess switching function between main frame and printer, lower electricity turns off the printing of printer.
A kind of parallel port monitoring device is needed to realize to the data monitoring between main frame and printer and to printer
It is controlled
Utility model content
Technical problem to be solved in the utility model is to provide a kind of parallel port monitoring device, including：Parallel port data transmit-receive
Module, for receiving parallel port data, and export parallel data corresponding with the parallel port data；Data conversion module, it is and described
The output end connection of parallel port data transmit-receive module, for receiving the parallel data of the parallel port data transmit-receive module output, and will
The parallel data is exported after being converted into serial data by serial line interface；Switch module, an input of the switch module
To hold for obtaining gating signal, another input is used to receive switching signal, when receiving shutdown signal, the switch module
For blocking the gating signal to transmit, when receiving open signal, the switch module is used to turn the gating signal
Change enable signal output into.
Optionally, the parallel port data transmit-receive module includes the first octal bus treiver chip, and described one or eight total
The data input pin of line transceiver chip is used to receive parallel port data, the data output of the first octal bus treiver chip
Hold for exporting parallel data.
Optionally, the data conversion module includes USB fifo chips and USB interface, the number of the USB fifo chips
The data output end of the first octal bus treiver chip is connected to according to input, the data of the USB fifo chips are defeated
Go out end and be connected to the USB interface.
Optionally, the switch module includes：Second octal bus treiver chip, voltage monitoring chip and three poles
Pipe；The input of the voltage monitoring chip is used to receive switching signal, and the output end of the voltage monitoring chip is connected to institute
State the base stage of triode；The colelctor electrode of the triode is connected to power supply by a resistance, and connects the two or eight BITBUS network
The Enable Pin of transponder chip；One data-out pin of the second octal bus treiver chip is used to obtain gating letter
Number, a data output pins of the second octal bus treiver chip are used to export enable signal.
Optionally, the data output pins for being used to export enable signal of the second octal bus treiver chip also connect
The write-in for being connected to the USB fifo chips enables pin.
Optionally, the input of the voltage monitoring chip is connected to the power pins of the USB interface；As the USB
When electric on interface, switching signal that the input of the voltage monitoring chip receives is open signal, the voltage monitoring chip
For exporting low level；When the USB interface powers off, the switching signal that the input of the voltage monitoring chip receives is pass
Signal is closed, the voltage monitoring chip is used to export high level.
To solve the above problems, the utility model also provides a kind of print system, including：First main frame, including an output
Parallel port, for exporting parallel port data to be printed；Printer, including an input parallel port, the data input pin of the input parallel port
It is connected with the data output end of the output parallel port；The parallel port monitoring device, including parallel port data transmit-receive module, data conversion
Module and switch module；The input of institute's parallel port data transmit-receive module is connected to the data output end of the output parallel port, uses
In the reception output parallel port to the input and the parallel port data of port transmission, and output is corresponding with the parallel port data parallel
Data；The data conversion module, it is connected with the output end of the parallel port data transmit-receive module, for receiving the parallel port data
The parallel data of transceiver module output, and the parallel data is converted into exporting by serial line interface after serial data；It is described
One input of switch module is connected to the gating signal output pin of the output parallel port, for obtaining the output parallel port
The gating signal of output, an output end are connected to the enabled pin of the input parallel port, for being exported to the input parallel port
Enable signal, another input is used to receive switching signal, and when receiving shutdown signal, the switch module is used to block institute
Gating signal transmission is stated, closes the data transmission channel between the input parallel port and the output parallel port, when receiving out
When opening signal, the switch module is used to output enable signal to input parallel port, makes output parallel port and the number inputted between parallel port
Opened according to transmission channel.
Optionally, the parallel port data transmit-receive module includes the first octal bus treiver chip, and described one or eight total
The data input pin of line transceiver chip is connected to the data output end of the output parallel port, first octal bus treiver
The data output end of chip is used to export corresponding parallel data.
Choosing, the data conversion module includes USB fifo chips and USB interface, the data of the USB fifo chips
Input is connected to the data output end of the first octal bus treiver chip, the data output of the USB fifo chips
End is connected to the USB interface.
Optionally, the switch module includes：Second octal bus treiver chip, voltage monitoring chip and three poles
Pipe；The input of the voltage monitoring chip is used to receive switching signal, and the output end of the voltage monitoring chip is connected to institute
State the base stage of triode；The colelctor electrode of the triode is connected to power supply by a resistance, and connects the two or eight BITBUS network
The Enable Pin of transponder chip；One data-out pin of the second octal bus treiver chip is described for being connected to
The gating signal output pin of parallel port is exported, a data output pins of the second octal bus treiver chip are used to connect
It is connected to the enabled pin of the input parallel port.
Optionally, the data output pins for being used to export enable signal of the second octal bus treiver chip also connect
The write-in for being connected to the USB fifo chips enables pin.
Optionally, the input of the voltage monitoring chip is connected to the power pins of the USB interface；As the USB
When electric on interface, switching signal that the input of the voltage monitoring chip receives is open signal, the voltage monitoring chip
For exporting low level；When the USB interface powers off, the switching signal that the input of the voltage monitoring chip receives is pass
Signal is closed, the voltage monitoring chip is used to export high level.
Optionally, in addition to the second main frame, it is connected with the data conversion module, for receiving the serial data.
Parallel port monitoring device of the present utility model and the print system with the monitoring device, it can be beaten completing data
While print, the acquisition function of print data is completed, greatly facilitates statistics and analysis demand of the user to various data, and
Possess switch control functions, can easily control the printing of printer and opening and shutting off for data acquisition function.
Brief description of the drawings
Fig. 1 is the structural representation of the parallel port monitoring device of the embodiment of the utility model one；
Fig. 2 is the structural representation of the print system of the embodiment of the utility model one；
Fig. 3 is the structural representation of the print system of the embodiment of the utility model one；
Fig. 4 is the circuit structure diagram of the parallel port monitoring device of the embodiment of the utility model one；
Pin connection diagram of the output parallel port of the embodiment of Fig. 5 the utility model one with inputting parallel port.
Embodiment
The embodiment of parallel port monitoring device provided by the utility model and print system is done below in conjunction with the accompanying drawings
Describe in detail.
Fig. 1 is refer to, is the structural representation of the parallel port monitoring device of the embodiment of the utility model one.
The parallel port monitoring device includes：Parallel port data transmit-receive module 101, data conversion module 102 and switch module
103.The parallel port monitoring device can be used for monitoring the data between main frame and printer, be acquired and control printing work(
Energy is switched on and off.
The parallel port data transmit-receive module 101 is used to receive parallel port data, and exports corresponding simultaneously with the parallel port data
Row data.The parallel port data transmit-receive module 101 can be connected to the output parallel port of main frame, obtain main frame and export to printer simultaneously
The parallel port data of mouth.The parallel port data transmit-receive module 101 is additionally operable to carry out the parallel port data of reception buffered-display driver, output pair
The parallel data answered, such as the parallel port data use Transistor-Transistor Logic level signal, the parallel port data transmit-receive module 101 will described in simultaneously
After mouth data carry out level conversion, the parallel data of CMOS level forms is exported, will to meet the level voltage of other modules
Ask.
The data conversion module 102, it is connected with the output end of the parallel port data transmit-receive module 101, for receiving
The parallel data of the output of parallel port data transmit-receive module 101 is stated, and the parallel data is converted into after serial data by serial
Interface exports.The data conversion module 102 converts parallel data into serial data output, is transmitted by serial line interface to it
His main frame, carry out data acquisition, statistics or analysis etc..
One input of the switch module 103 is used to obtain gating signal, and another input is used to receive switch letter
Number, when receiving shutdown signal, the switch module 103 is used to block the gating signal to transmit, and letter is opened when receiving
Number when, the switch module 103 be used for by the gating signal be converted into enable signal output.
During main frame sends print data by parallel port to printer, export a pin in parallel port and send gating
Signal, it can just carry out data transmission when the input parallel port of printer receives gating signal.One of the switch module 103 is defeated
The gating signal pin of main frame output parallel port, the gating signal that Receiving Host is sent can be connected to by entering end.Switch module 103 receives
During to shutdown signal, switch module 103 does not work, no signal output, so as to block the transmission of gating signal so that main frame with
Data channel between printer is closed；When receiving open signal, the switch module 103 is used for the gating signal
Enable signal is converted into export to the input parallel port of printer so that gating signal turns on, so as to open main frame and printer it
Between data channel.The switching signal can be level signal, such as high level is open signal, and low level is believed to close
Number；Or low level is open signal, high level is shutdown signal.
In this specific embodiment, the switch module 103 can also be connected with the data conversion module 102, when
When the switch module 103 receives open signal, enable signal is sent to the data conversion module 102, opens the number
According to the data converting function of modular converter 102.So that when only switch module 103 receives open signal, printing is connected
And data acquisition function；And when receiving shutdown signal, turn off printing function and data acquisition function.In the utility model
Other embodiments in, the switch module 103 can not also with the data conversion module 102, not to the number
It is controlled according to modular converter 102.
Fig. 2 is refer to, is the structural representation of the print system of the embodiment of the utility model one.
The print system includes：First main frame 201, printer 202 and parallel port monitoring device 203.
First main frame 201, including an output parallel port, for exporting parallel port data to be printed.
The printer 202, including an input parallel port, the data input pin of the input parallel port and the output parallel port
Data output end connects.
One input of the parallel port monitoring device 203 and the data output end of the output parallel port of the first main frame 201 connect
Connect, for receiving the output parallel port to the input and the parallel port data of port transmission, and export serial data；The parallel port prison
Another input of device for tone frequencies 203 is connected with the gating signal output pin of the output parallel port of the first main frame 201, for obtaining
State the gating signal of output parallel port output；One output end of the parallel port monitoring device 203 is connected to the printer 202
The enabled pin of parallel port is inputted, for exporting enable signal to the input parallel port；The parallel port monitoring device 203 it is another defeated
Enter end to be used to receive switching signal, when receiving shutdown signal, the parallel port monitoring device 203 is used to block the gating letter
Number transmission, make first main frame 201 input parallel port and the printer 202 output parallel port between data transmission channel
Close, when receiving open signal, the parallel port monitoring device 203 is used for the input for outputing enable signal to printer 202
Parallel port, open the data transmission channel between the output parallel port of the first main frame 201 and the input parallel port of printer 202.
In the embodiment, the print system also includes the second main frame 204, second main frame 204 with it is described
Parallel port monitoring device 203 connects, the serial data exported for receiving the parallel port monitoring device 203.Of the present utility model
In other embodiments, the print system can not also include second main frame 204, need data acquisition when
Wait, reconnect second main frame 204.
Fig. 3 is refer to, is the structural representation of the print system of the embodiment of the utility model one.
The parallel port monitoring device 203 includes：Parallel port data transmit-receive module 301, data conversion module 302 and switching molding
Block 303.
The parallel port data transmit-receive module 301 is used to receive parallel port data, and exports corresponding simultaneously with the parallel port data
Row data.The parallel port data transmit-receive module 301 is connected to the output parallel port of the first main frame 201, obtains main frame and exports to printing
The parallel port data of the parallel port of machine 202.The parallel port data transmit-receive module 301 is additionally operable to carry out data buffering to the parallel port data of reception
Driving, parallel data corresponding to output.The parallel port data transmit-receive module 301 by the parallel port data carry out level conversion it
Afterwards, the parallel data of CMOS level forms is exported, to meet the level voltage requirement of other modules.
The data conversion module 302, it is connected with the output end of the parallel port data transmit-receive module 301, for receiving
The parallel data of the output of parallel port data transmit-receive module 301 is stated, and the parallel data is converted into after serial data by serial
Interface exports.The data conversion module 102 converts parallel data into serial data output, is transmitted by serial line interface to it
His main frame, carry out data acquisition, statistics or analysis etc..
One input of the switch module 303 can be connected to the gating signal that first main frame 201 exports parallel port
Pin, receive the gating signal that first main frame 201 is sent；One output end of the switch module 303 is connected to described
The enabled pin of the input parallel port of printer 202；303 another input of switch module is used to receive switching signal, described
When switch module 303 receives shutdown signal, switch module 303 does not work, no signal output, so as to block gating signal
Transmission so that the data channel between the first main frame 201 and printer 202 is closed；When receiving open signal, the switch
Module 303 is exported to the input parallel port of printer 202 for the gating signal to be converted into enable signal so that gating signal
Conducting, so as to open the data channel between the first main frame 201 and printer 202.
In this specific embodiment, the switch module 303 can also be connected with the data conversion module 302, when
When the switch module 303 receives open signal, enable signal is sent to the data conversion module 302, opens the number
According to the data converting function of modular converter 302.So that when only switch module 303 receives open signal, printing is connected
And data acquisition function；And when receiving shutdown signal, turn off printing function and data acquisition function.In the utility model
Other embodiments in, the switch module 303 can not also with the data conversion module 302, not to the number
It is controlled according to modular converter 302.
The serial line interface of the data conversion module 302 is connected with second main frame 204, for second main frame
204 output serial datas.
Fig. 4 and Fig. 5 are refer to, is the parallel port monitoring device of the embodiment of the utility model one and the tool of print system
Body electrical block diagram, Fig. 4 are the circuit structure diagram of parallel port monitoring device, and Fig. 5 is output parallel port and the printing of the first main frame
The pin connection figure of the input parallel port of machine.
In the embodiment, the parallel port data transmit-receive module 401 includes the first octal bus treiver chip U2,
Data input pin B0~B7 of the first octal bus treiver chip U2 is used to receive parallel port data, specifically, printing
In system, data input pin B0~B7 of the first octal bus treiver chip U2 is connected to the output parallel port of the first main frame
J1 data output end D0~D7, the first octal bus treiver chip U2 data output end A0~A7 are used to export simultaneously
Row data.Other pins of the first octal bus treiver chip U2 are attached according to the definition of the pin of chip.It is described
Export parallel port J1 model CONN DB25Male public mouth, the mother of the input parallel port J3 model CONN DB25Female
Mouthful.
In this specific embodiment, the chip model that the first octal bus treiver chip U2 is used for
74HCT245PW, in other embodiments of the present utility model, eight BITBUS networks of other models can also be used to receive and dispatch
Device chip.
The data conversion module 402 includes USB fifo chips (the USB chips with first in first out data buffer)
U1 and USB interface J2, data input pin D0~D7 of the USB fifo chips U1, it is connected to the one or the eight BITBUS network transmitting-receiving
Device chip U2 data output end A0~A7, for receiving the first octal bus treiver chip U2 is exported and line number
According to；Data output end USBDM, USBDP of the USB fifo chips U1 is connected to the data input pin D- of the USB interface J2
And D+.
In this embodiment, the model FT245RL of the USB fifo chips U1, USB interface J2 are USB
TypeB interfaces.
The switch module 403 includes：Second octal bus treiver chip U3, voltage monitoring chip U4 and triode
Q1；The input Vin of the voltage monitoring chip U4 is used to receive switching signal, the output end of the voltage monitoring chip U4
Vout is connected to the base stage of the triode Q1 by a resistance R20；The colelctor electrode of the triode Q1 is connected by a resistance R19
Power supply is connected to, and is connected to the Enable Pin OE of the second octal bus treiver chip U3, for total to described two or eight
Line transceiver chip U3 sends enable signal STROBE_EN；A data of the second octal bus treiver chip U3 are defeated
Enter the gating signal output pin 1 that pin B0 is used to be connected to the output parallel port J1 of first main frame, for receiving gating letter
Number/STROBE；A data output pins A0 of the second octal bus treiver chip U3 is used to be connected to the input
Parallel port J3 enabled pin 1, for sending write-in enable signal WR to the input parallel port J3.
In this specific embodiment, the number for being used to export enable signal of the second octal bus treiver chip U2
The write-in that the USB fifo chips U1 is additionally coupled to according to output pin A0 enables pin, enable signal WR is inputted, described in control
USB fifo chips U1 write operation.
In this specific embodiment, the input Vin of the voltage monitoring chip U4 is connected to the USB interface J2's
Power pins VBUS, the voltage monitoring chip U4 input Vin receive power pins VBUS voltage signal, as opening
OFF signal.When electric on the USB interface J2, switching signal that the input Vin of the voltage monitoring chip U4 is received is opens
Signal is opened, the voltage monitoring chip U4 is used to export low level；When the USB interface J2 is powered off, the voltage monitoring core
The switching signal that piece U4 input Vin is received is shutdown signal, and the voltage monitoring chip U4 is used to export high level.
The power end of the parallel port data transmit-receive module 401, data conversion module 402 and switch module 403 can also
It is connected to the power pins VBUS of the USB interface J2.When electric on the USB interface J2, such as USB interface is connected to second
During main frame, the second main frame is powered to the power pins VBUS, upper 5V power supplys, and the parallel port data transmit-receive module 401, data turn
Mold changing block 402 works, the USB fifo chips U1 and the first octal bus treiver chip U2, the second octal bus treiver
Chip U3 is also both powered up work.Input parallel port J1 output parallel port data by the tunnel of parallel port data transmit-receive module 401 1 transmit to
Parallel port J3 is exported, another way changes into serial data by data conversion module 402 and exported.In other specific realities of the present utility model
Apply in mode, the power end of the parallel port data transmit-receive module 401, data conversion module 402 and switch module 403 can also
It is powered additionally by power supply.
In the embodiment, because the power pins VBUS of USB interface J2 voltage is power supply power supply source,
Originally can directly as switching signal, but export parallel port J1 output /STROBE signals acquiescence be high level, so power pins
VBUS voltage can leak electricity by the second octal bus treiver chip U3 so that level is less than 4.5V, therefore can not play out
The effect of pass.Therefore, voltage monitoring chip U4 is added, does the comparison of level.Voltage monitoring chip U4 input Vin connections electricity
Source pin VBUS, if electric leakage is then less than 4.5V, voltage monitoring chip U4 output end vo ut output low levels, triode Q1
Base stage to be low, triode Q1 disconnects, and is high level at colelctor electrode, the enabled pin of the second octal bus treiver chip U3
OE is high level, and U3 does not work, so export parallel port /STROBE signals are just blocked, serve the effect of shut-off.If
Electric on USB interface J2, the voltage on power pins VBUS is higher than 4.5V, voltage monitoring chip U4 output end vo ut outputs for 5V
High level, triode Q1 base stage is height, and triode Q1 is turned on, and is low level at colelctor electrode, the two or the eight BITBUS network transmitting-receiving
Device chip U3 enabled pin OE is low level, and U3 works, parallel port /STROBE signal conductions, serve the effect of unlatching.
The colelctor electrode of the triode Q1 is also connected to power supply by one light emitting diode D1 of resistance R5 series connection, works as power supply
When upper electric, the light emitting diode D1 is lighted, and prompts the parallel port monitoring device to work.
Above-mentioned parallel port monitoring device and the print system with the monitoring device, the same of data-printing can be completed
When, the acquisition function of print data is completed, greatly facilitates statistics and analysis demand of the user to various data, and possess out
Control function is closed, can easily control the printing of printer and opening and shutting off for data acquisition function.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (13)
- A kind of 1. parallel port monitoring device, it is characterised in that including：Parallel port data transmit-receive module, for receiving parallel port data, and export parallel data corresponding with the parallel port data；Data conversion module, it is connected with the output end of the parallel port data transmit-receive module, for receiving the parallel port data transmit-receive The parallel data of module output, and the parallel data is converted into exporting by serial line interface after serial data；Switch module, an input of the switch module are used to obtain gating signal, and another input, which is used to receive, to be switched Signal, when receiving shutdown signal, the switch module is used to block the gating signal to transmit, when receiving open signal When, the switch module is used to the gating signal being converted into enable signal output.
- 2. parallel port monitoring device according to claim 1, it is characterised in that the parallel port data transmit-receive module includes first Octal bus treiver chip, the data input pin of the first octal bus treiver chip are used to receive parallel port data, institute The data output end for stating the first octal bus treiver chip is used to export parallel data.
- 3. parallel port monitoring device according to claim 2, it is characterised in that the data conversion module includes USB FIFO Chip and USB interface, the data input pin of the USB fifo chips are connected to the first octal bus treiver chip Data output end, the data output end of the USB fifo chips are connected to the USB interface.
- 4. parallel port monitoring device according to claim 3, it is characterised in that the switch module includes：Second octal bus treiver chip, voltage monitoring chip and triode；The input of the voltage monitoring chip is used In receiving switching signal, the output end of the voltage monitoring chip is connected to the base stage of the triode；The collection of the triode Electrode is connected to power supply by a resistance, and connects the Enable Pin of the second octal bus treiver chip；Described 2nd 8 One data-out pin of BITBUS network transponder chip is used to obtain gating signal, the second octal bus treiver chip A data output pins be used for export enable signal.
- 5. parallel port monitoring device according to claim 4, it is characterised in that the second octal bus treiver chip The write-in that data output pins for exporting enable signal are additionally coupled to the USB fifo chips enables pin.
- 6. parallel port monitoring device according to claim 4, it is characterised in that the input connection of the voltage monitoring chip To the power pins of the USB interface；When electric on the USB interface, what the input of the voltage monitoring chip received opens OFF signal is open signal, and the voltage monitoring chip is used to export low level；When the USB interface powers off, the voltage The switching signal that the input of monitoring chip receives is shutdown signal, and the voltage monitoring chip is used to export high level.
- A kind of 7. print system, it is characterised in that including：First main frame, including an output parallel port, for exporting parallel port data to be printed；Printer, including an input parallel port, the data input pin of the input parallel port and the data output end of the output parallel port Connection；The parallel port monitoring device, including parallel port data transmit-receive module, data conversion module and switch module；The input of institute's parallel port data transmit-receive module is connected to the data output end of the output parallel port, for receiving the output Parallel port exports parallel data corresponding with the parallel port data to the input and the parallel port data of port transmission；The data conversion module, it is connected with the output end of the parallel port data transmit-receive module, for receiving the parallel port data The parallel data of transceiver module output, and the parallel data is converted into exporting by serial line interface after serial data；One input of the switch module is connected to the gating signal output pin of the output parallel port, described for obtaining The gating signal of parallel port output is exported, an output end is connected to the enabled pin of the input parallel port, for the input Parallel port exports enable signal, and another input is used to receive switching signal, and when receiving shutdown signal, the switch module is used In blocking the gating signal transmission, close the data transmission channel between the input parallel port and the output parallel port, when When receiving open signal, the switch module is used to output enable signal to input parallel port, makes output parallel port and input parallel port Between data transmission channel open.
- 8. print system according to claim 7, it is characterised in that the parallel port data transmit-receive module includes the one or eight Bus transceiver chip, the data input pin of the first octal bus treiver chip are connected to the data of the output parallel port Output end, the data output end of the first octal bus treiver chip are used to export corresponding parallel data.
- 9. print system according to claim 8, it is characterised in that the data conversion module includes USBFIFO chips And USB interface, the data input pin of the USB fifo chips are connected to the data of the first octal bus treiver chip Output end, the data output end of the USB fifo chips are connected to the USB interface.
- 10. print system according to claim 9, it is characterised in that the switch module includes：Two or eight BITBUS network is received Send out device chip, voltage monitoring chip and triode；The input of the voltage monitoring chip is used to receive switching signal, described The output end of voltage monitoring chip is connected to the base stage of the triode；The colelctor electrode of the triode is connected to by a resistance Power supply, and connect the Enable Pin of the second octal bus treiver chip；The one of the second octal bus treiver chip Individual data-out pin is used for the gating signal output pin for being connected to the output parallel port, second octal bus treiver One data output pins of chip are used for the enabled pin for being connected to the input parallel port.
- 11. print system according to claim 10, it is characterised in that the use of the second octal bus treiver chip The write-in that the USB fifo chips are additionally coupled in the data output pins of output enable signal enables pin.
- 12. print system according to claim 10, it is characterised in that the input of the voltage monitoring chip is connected to The power pins of the USB interface；When electric on the USB interface, switch that the input of the voltage monitoring chip receives Signal is open signal, and the voltage monitoring chip is used to export low level；When the USB interface powers off, the voltage prison The switching signal that the input of control chip receives is shutdown signal, and the voltage monitoring chip is used to export high level.
- 13. print system according to claim 7, it is characterised in that also including the second main frame, with the data conversion mould Block connects, for receiving the serial data.
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| CN107391058A (en) * | 2017-07-25 | 2017-11-24 | 上海慧银信息科技有限公司 | Parallel port monitoring device and print system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107391058A (en) * | 2017-07-25 | 2017-11-24 | 上海慧银信息科技有限公司 | Parallel port monitoring device and print system |
| CN107391058B (en) * | 2017-07-25 | 2023-09-12 | 上海慧银信息科技有限公司 | Parallel port monitoring device and printing system |
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