CN212341294U - Two-wire transmitter display instrument - Google Patents
Two-wire transmitter display instrument Download PDFInfo
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- CN212341294U CN212341294U CN202020929318.9U CN202020929318U CN212341294U CN 212341294 U CN212341294 U CN 212341294U CN 202020929318 U CN202020929318 U CN 202020929318U CN 212341294 U CN212341294 U CN 212341294U
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Abstract
The utility model discloses a two-wire transmitter display, which comprises a controller, a display screen, a wiring terminal and an ADC sampling module; the display screen, the wiring terminal and the ADC sampling module are respectively connected with the controller; the wiring terminal comprises a grounding terminal, a first communication wiring terminal, a second communication wiring terminal, a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are connected with the transmitter; the display instrument is connected with the transmitter and is used for displaying a current value and a measured value of the transmitter; the display screen is used for outputting and displaying the current value and the measured value. The utility model provides a two-wire system changer display instrument shows changer measurement parameter when realizing showing the current value, need not insert by extra power, promotes the interference killing feature of display instrument, and simultaneously, the display instrument is connected portably, and convenient to use reduces maintenance work volume.
Description
Technical Field
The utility model relates to a changer display technical field especially relates to a two-wire system changer display.
Background
The current universal 4mA-20mA current display instrument can only display the current value and can not simultaneously display the measurement parameters of the transmitter. When the current display instrument is installed on the centralized display cabinet, the display instrument cannot identify which current value corresponds to which field test parameter, and cannot intuitively read the field test parameter value corresponding to the current, such as liquid level, temperature, pressure, flow and the like. Meanwhile, the display instrument needs to be connected with a power supply or a battery during working, the connection is troublesome, the use is inconvenient, the external circuit can interfere or influence the display instrument during working, and the battery needs to be maintained when the battery is not powered.
SUMMERY OF THE UTILITY MODEL
The utility model provides a two-wire system changer display instrument aims at realizing showing the simultaneous display changer measurement parameter of current value through providing a two-wire system changer display instrument, solves external power supply's interference problem and display instrument and changer's connection problem simultaneously.
In order to achieve the above object, the present invention provides a two-wire transmitter display device, which includes a controller, a display screen, a connection terminal, and an Analog to Digital Converter (ADC) module; the display screen, the wiring terminal and the ADC sampling module are respectively connected with the controller; the wiring terminal comprises a grounding terminal, a first communication wiring terminal, a second communication wiring terminal, a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are connected with the transmitter; the display instrument is connected with the transmitter and is used for displaying a current value and a measured value of the transmitter; the display screen is used for outputting and displaying the current value and the measured value.
Preferably, the positive terminal is connected with the negative pole of the transmitter, and the negative terminal is connected with the negative pole of the direct current power supply; correspondingly, the positive pole of the transmitter is connected with the positive pole of the direct current power supply.
Preferably, the positive terminal is connected with the positive pole of the direct power supply, and the negative terminal is connected with the positive pole of the transmitter; correspondingly, the negative pole of the transmitter is connected with the negative pole of the direct current power supply.
Preferably, the Display screen is a Liquid Crystal Display (LCD), the Display screen is divided into two lines to Display, the first line displays the parameter value to be measured on site, and the second line displays the loop current value.
Preferably, the ADC sampling module is a 16-bit ADC sampling.
Preferably, the first communication connection terminal is connected to a universal asynchronous Receiver Transmitter/Transmitter (UART) communication port.
Preferably, the second communication terminal is connected with a USB interface.
Preferably, the display instrument adopts a guide rail type installation mode.
The utility model provides a two-wire system changer display instrument shows changer measurement parameter when realizing showing the current value, need not insert by extra power, promotes the interference killing feature of display instrument, and simultaneously, the display instrument is connected portably, and convenient to use reduces maintenance work volume.
Drawings
Fig. 1 is a schematic structural diagram of a two-wire transmitter display according to an embodiment of the present invention;
fig. 2 is a schematic structural view of the connection terminal of fig. 1;
fig. 3 is a schematic diagram of a connection between a display and a transmitter according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of the connection between the display and the transmitter provided by the second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2 in combination, an embodiment of the present invention provides a two-wire transmitter display, where the two-wire transmitter display 1 includes a controller 10, a display screen 20, a connection terminal 30, and an ADC sampling module 40; the display screen 20, the wiring terminal 30 and the ADC sampling module 40 are respectively connected with the controller 10; the controller 10 is used as a main control manager of the display instrument to realize the management of each module of the display instrument and the storage of the setting data and the test data; the connection terminals 30 include a first Ground (GND) terminal 31, a first communication connection terminal 32, a second communication connection terminal 33, and a positive terminal 34 and a negative terminal 35 for connecting a transmitter and/or a dc power supply; wherein the first communication connection terminal 32 comprises a Transmit (TX) terminal 321 and a Receive (RX) terminal 322, and the second communication connection terminal 33 comprises a D + terminal 331, a D-terminal 332, a Vusb terminal 333 and a second GND terminal 334; the ADC sampling module is a 16-bit ADC for sampling, provides high-precision sampling capability and can ensure that the acquired 4-20mA loop current is not distorted. The display instrument is connected with the transmitter and is used for displaying a current value and a measured value of the transmitter; the display screen 20 is used for outputting and displaying the current value and the measured value. The display screen 20 is a Liquid Crystal Display (LCD), and the display screen displays in two lines, wherein the first line displays the parameter value to be measured on site, and the second line displays the loop current value.
The first communication terminal 32 is connected to a universal asynchronous Receiver/Transmitter (UART) communication port, which is convenient for electrical engineers to perform secondary development on a product basis. The second communication wiring terminal 33 is connected with a USB interface, the USB interface can be in data communication with external equipment, specifically, in one embodiment, the USB interface is used for performing data communication with an upper computer, the communication of the USB interface is electrified from the upper computer, no influence is caused on the power consumption of the display instrument and the transmitter, and the test display precision and the display result of the display instrument and the transmitter are not influenced.
Referring to fig. 3, in a first embodiment of the present invention, the display device 1 and the transmitter 2 are connected as follows: the positive terminal 34 of the display instrument 1 is connected with the negative LOOP-terminal 201 of the transmitter 2, and the negative terminal 35 of the display instrument 1 is connected with the negative connecting terminal 102 of the direct-current power supply; the positive LOOP + terminal 202 of the transmitter 2 is connected to the positive terminal 101 of the dc power supply, and the transmitter 2 also has a ground terminal 103 to ground.
Referring to fig. 4, in the second embodiment of the present invention, the display device 1 and the transmitter 2 are connected as follows: the positive terminal 34 of the display 1 is connected with the positive connecting terminal 101 of the direct current power supply, and the negative terminal 35 of the display 1 is connected with the positive LOOP + terminal 202 of the transmitter 2; a negative LOOP-terminal 201 of the transmitter 2 is connected with a negative wiring terminal 102 of the direct-current power supply; transmitter 2 also has ground terminal 103 to ground.
In the above embodiments of the utility model, the display instrument supplies display instrument self work after getting and handling through 4-20mA LOOP (LOOP) current signal that comes to the transmitter conveying, reads in real time and turns into the current value corresponding transmitter measured value (pressure/flow/temperature/liquid level/humidity etc.) with the current value 4-20mA LOOP current signal of input simultaneously, and measured value and current value are shown on the display screen together in real time, supply the person on duty to check meter and control. The display instrument power supply derives from loop 4-20mA electric current, need not extra power supply, need not external power supply, need not the battery, consequently, the utility model provides a two-wire system changer display instrument is passive changer display instrument, has simplified the connection assembly of display instrument, and convenient to use reduces maintenance work volume. Because the display instrument and the transmitter are connected by using the two-wire loop, no external power supply is used, and no connection is made with an external circuit, the display instrument is ensured not to have any interference or influence on the parameter measurement precision of the monitoring transmitter, and the display effectiveness of the display instrument is improved.
The display instrument adopts a guide rail type installation mode and meets the industrial standard of product installation.
Compared with the prior art, the two-wire transmitter display instrument provided by the utility model can display the current value and simultaneously display the measurement parameters of the transmitter, does not need to be accessed by an additional power supply, improves the anti-interference capability of the display instrument, and ensures that the display instrument can display the measurement parameters of the transmitter without any interference and influence; meanwhile, the display instrument is simple and convenient to connect and convenient to use, and the maintenance workload is reduced.
The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.
Claims (8)
1. The two-wire transmitter display instrument is characterized by comprising a controller, a display screen, a wiring terminal and an Analog-to-Digital Converter (ADC) sampling module; the display screen, the wiring terminal and the ADC sampling module are respectively connected with the controller; the wiring terminal comprises a grounding terminal, a first communication wiring terminal, a second communication wiring terminal, a positive terminal and a negative terminal, wherein the positive terminal and the negative terminal are connected with the transmitter; the display instrument is connected with the transmitter and is used for displaying a current value and a measured value of the transmitter; the display screen is used for outputting and displaying the current value and the measured value.
2. The two-wire transmitter display of claim 1, wherein the positive terminal is connected to a negative terminal of the transmitter, and the negative terminal is connected to a negative terminal of a dc power supply; correspondingly, the positive pole of the transmitter is connected with the positive pole of the direct current power supply.
3. The two-wire transmitter display of claim 1, wherein the positive terminal is connected to a positive pole of a direct power supply and the negative terminal is connected to a positive pole of a transmitter; correspondingly, the negative pole of the transmitter is connected with the negative pole of the direct current power supply.
4. The two-wire transmitter Display of claim 1, wherein the Display screen is a Liquid Crystal Display (LCD) screen that displays in two lines, a first line displaying a value of a parameter to be measured on site and a second line displaying a loop current value.
5. The two-wire transmitter display of claim 1, wherein the ADC sampling module is a 16-bit ADC sampling.
6. The two-wire Transmitter display of claim 1, wherein the first communication terminal is coupled to a Universal Asynchronous Receiver/Transmitter (UART) communication port.
7. The two-wire transmitter display of claim 1, wherein the second communication terminal is connected to a USB interface.
8. The two-wire transmitter display of claim 1, wherein the display is rail mounted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020929318.9U CN212341294U (en) | 2020-05-27 | 2020-05-27 | Two-wire transmitter display instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020929318.9U CN212341294U (en) | 2020-05-27 | 2020-05-27 | Two-wire transmitter display instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212341294U true CN212341294U (en) | 2021-01-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020929318.9U Active CN212341294U (en) | 2020-05-27 | 2020-05-27 | Two-wire transmitter display instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212341294U (en) |
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2020
- 2020-05-27 CN CN202020929318.9U patent/CN212341294U/en active Active
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