CN106679698A - Absolute-value-encoder simulation system based on synchronized serial interface signal - Google Patents

Abstract

The invention discloses an absolute value encoder simulation system based on a synchronous serial interface signal. The system includes a setting terminal and an absolute value encoder simulation board; the setting terminal searches the absolute value encoder simulation board through Bluetooth, and Displayed in the device list; the user sets the SSI signal parameters through the setting terminal, and sends these parameters to the absolute encoder simulation board; the absolute encoder simulation board receives the parameters sent by the setting terminal, and generates the SSI signal according to these parameters , and the SSI signal is output by the serial interface on the board. The system simulates the absolute encoder to output reliable SSI signals, which is used to solve the problem that the failure of the SSI signal acquisition device is difficult to be detected in actual production, and reduces the detection cost of the SSI signal acquisition device.

Description

Absolute encoder simulation system based on synchronous serial interface signal

technical field

The invention relates to a simulation system, more specifically to an absolute value encoder simulation system based on a synchronous serial interface signal.

Background technique

In today's industrial measurement and control field, the Synchronized Serial Interface (SSI) is widely used in various measurement devices due to its good anti-interference performance and long transmission distance, such as valve opening and hydraulic cylinder stroke. display etc. The collection of SSI signals has increasingly become an important link in industrial applications, and the reliability of the SSI signal collection device is the key to ensure that the SSI signals are accurately collected and displayed.

At present, the acquisition sources of SSI signal acquisition devices mainly rely on various SSI signal absolute encoders, such as rotary absolute encoders and displacement absolute encoders. In the process of SSI signal acquisition, problems such as spikes, wrong codes, and jumps often appear in the SSI signal acquisition display, and it is difficult to accurately output regular SSI signals by relying on the SSI signal absolute value encoder controlled manually, so that the SSI signal acquisition Device problems are reproduced and diagnosed.

Contents of the invention

The object of the present invention is to provide a synchronous serial interface-based absolute encoder simulation system for the shortcomings of synchronous serial signal acquisition device fault reproduction and diagnosis technology.

The object of the present invention is achieved through such a technical solution: an absolute value encoder simulation system based on a synchronous serial interface signal. The system includes a setting terminal and an absolute value encoder simulation board; the setting terminal searches the absolute value code through Bluetooth and display it in the device list; the user sets the SSI signal parameters through the setting terminal and sends these parameters to the absolute encoder simulation board; the absolute encoder simulation board receives the signal sent by the setting terminal parameters, generate SSI signals according to these parameters, and output SSI signals through the serial interface on the board.

Further, the SSI signal parameters include channel number, bit width, minimum value, maximum value and increment.

Further, set the terminal to synchronously display the connection status, MAC address and RSSI strength value of the Bluetooth signal of the absolute encoder simulation board in the device list.

Further, the absolute encoder simulation board includes a controller, a Bluetooth module, a power supply module, a power supply module indicator light, a PROM storage module, a PROM program storage indicator light, a crystal oscillator module, an external clock signal acquisition module and an SSI signal output module ; Among them, the Bluetooth module, power module, PROM storage module, crystal oscillator module, external clock signal acquisition module, and SSI signal output module are all connected to the controller; the indicator light of the power module is connected to the power input; the PROM program storage indicator is connected to the PROM storage module .

Further, after the controller is powered on, it first completes the initialization work, and then enters the waiting state, waiting for the external clock signal and the input signal of the setting terminal; the user inputs the parameters of the SSI signal to be output at the setting terminal, and sends the parameters to the absolute The value encoder simulates the Bluetooth module of the board; after sending the SSI signal parameters and accessing the external clock signal, the controller enters the SSI signal output state, first collects the SSI signal parameters received by the Bluetooth module, and then generates the SSI signal and outputs it through the SSI signal Module output; the user sends new SSI signal parameters again, and the controller will collect new SSI signal parameters from the Bluetooth module and output new SSI signals through the SSI signal output module.

Further, the controller is based on FPGA, uses 8MHz crystal oscillator, the core operating voltage is 1.2V, and the IO interface operating voltage is 2.5V and 3.3V; the Bluetooth module chip is CC2541, and its serial port communication rate is 9600 baud rate; SSI signal output The level signal conversion chip used by the module is MAX490; the power supply module supplies power to all other modules, and is divided into three power supply lines of 1.2V, 2.5V, and 3.3V after the level conversion chip; the 1.2V power supply line is for the core of the FPGA chip Power supply, the 2.5V line supplies power to some FPGA IO interfaces, and the 3.3V line supplies power to some FPGA IO interfaces and PROM storage modules; the PROM program storage indicator shows the working status of the PROM storage module; the power module indicator shows the working status of the power module; The system also includes a housing. There are two interfaces on one side of the housing, namely the DB9 single-channel SSI signal output interface and the DB25 four-channel SSI signal output interface; the other side has four interfaces, which are the power module indicator light observation window, Power switch, power access hole and reset switch; DB9 single-channel SSI signal output interface is used to output single-channel SSI signal to the outside; DB25 four-channel SSI signal output interface is used to output four-channel SSI signal to the outside; power module indicator light The observation window displays the status of the indicator light; the power switch controls the disconnection of the absolute encoder analog board; the power access hole is connected to an external 5V1A DC power adapter; the reset switch controls the reset operation of the absolute encoder analog board.

Further, the setting terminal is composed of a bluetooth device search module and a signal parameter setting module; the bluetooth device search module searches and displays surrounding bluetooth devices, and establishes a connection with the selected bluetooth device; the signal parameter setting module displays and selects The connection state of the Bluetooth device, the MAC address and the RSSI strength of the Bluetooth signal, accept the SSI signal parameters input by the user and send these parameters to the absolute encoder analog board.

The beneficial effects of the present invention are: the system of the present invention can flexibly configure different SSI signal parameters by setting the terminal, and the absolute value encoder analog board can accurately output reliable SSI signals, which solves the problem that the current absolute value encoder is difficult to adjust manually Issues with accurately outputting SSI signals. By regularly outputting accurate SSI signals, problems such as spikes, error codes, and jumps that occur during the SSI signal acquisition process can be effectively reproduced, thereby further diagnosing the faults of the SSI signal acquisition device and ensuring the reliability of industrial measurement and control. reliability. The system of the invention supports single-channel SSI signal output and four-channel SSI signal output at the same time, has low cost, convenient software and hardware setting, and effectively reduces the detection cost of the SSI signal acquisition device.

Description of drawings

Fig. 1 is an overall structural block diagram of the present invention;

Fig. 2 is the interface diagram of setting the terminal host computer, (a) is to display the bluetooth device interface around, (b) is the parameter setting interface;

Figure 3 is a hardware block diagram of the absolute encoder simulation board.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Fig. 1, the present invention is an absolute value encoder simulation system based on a synchronous serial interface, including terminal host computer software and a synchronous serial interface absolute value encoder simulation board. Set the terminal host computer software to set the channel number, bit width, minimum value, maximum value and increment of the SSI signal to be output, and send these parameters to the synchronous serial interface absolute value encoder analog board through Bluetooth; synchronous serial interface The interface analog board receives and collects the SSI signal parameters sent by Bluetooth. After receiving the SSI clock signal sent by the external SSI collection device, it generates a sinusoidal output SSI signal according to these parameters, and passes through the two interfaces of DB9 and DB25 respectively. Perform single-channel SSI signal output and four-channel SSI signal output to the SSI signal acquisition device. The analog board uses a common 5V1A DC adapter on the market as the adapted input working current, which can run stably for a long time.

As shown in Figure 2, described setting terminal is made of bluetooth device search module and signal parameter setting module; Described bluetooth device search module searches and displays surrounding bluetooth device, establishes the connection with selected bluetooth device; Signal parameter setting module Display the connection status, MAC address and RSSI strength of the Bluetooth signal with the selected Bluetooth device, accept the SSI signal parameters input by the user and send these parameters to the absolute encoder analog board.

The working process of setting the terminal host computer software is as follows:

(1) Set terminal host computer software initialization: initialize the program interface, search and display the surrounding Bluetooth devices;

(2) Parameter setting and sending operation: the interface displays whether it is connected to the previously selected Bluetooth device; the user fills in the channel number, bit width, minimum value, maximum value and increment of the SSI signal to be output in the corresponding input column, After all parameters are input, the data can be sent to the absolute encoder simulation board.

(3) Parameter refresh configuration operation: When a new SSI signal needs to be output, the user can re-input the parameters of the SSI signal in the setting terminal host computer software, and send it to the absolute encoder simulation board again after all parameters are input.

As shown in Figure 3, the synchronous serial interface absolute value encoder analog board is composed of a controller, a bluetooth module, a power input and voltage stabilizing module, an LED indicator light of the power input and voltage stabilizing module, a PROM storage module, and a PROM program storage LED indicator light, 8MHz crystal oscillator module, external clock signal acquisition module, SSI signal output module and shell; Bluetooth module, power input and voltage regulator module, PROM storage module, 8MHz crystal oscillator module, external clock signal acquisition module, SSI signal output The module is connected to the FPGA module; the power input and voltage stabilization module LED indicators are connected to the power input and voltage stabilization module; the PROM program storage LED indicator is connected to the PROM storage module; FPGA controller, Bluetooth module, power input and voltage stabilization module, The PROM storage module, PROM program storage LED indicator light, 8MHz crystal oscillator module and external clock signal acquisition module are located in the shell, the power supply and voltage stabilization module LED indicator light, and the SSI signal output module are located in the edge opening of the shell.

The controller is based on FPGA, the chip model is XC3S-4TQG144 400, uses 8MHz crystal oscillator, the core operating voltage is 1.2V, and the IO interface operating voltage is 2.5V and 3.3V; the controller is connected to the PROM storage module, and the chip model used by the PROM storage module It is XCF04S with a capacity of 4Mbit. The firmware program executed by the storage controller is developed using ISE 14.7. The firmware program is burned into the PROM storage module through the JTAG interface using a dedicated programmer. When the controller is powered on, the firmware program is The program is read and executed from the PROM storage module; the controller is connected to the Bluetooth module, and reads the SSI signal configuration parameters sent by the host computer of the mobile terminal from the serial port of the Bluetooth module. The Bluetooth chip model is CC2541, and its serial port communication rate is 9600 waves baud rate; the controller is connected with the external clock signal acquisition module to read the external input SSI clock signal, and the external clock signal acquisition module converts the two-way differential SSI clock signal input from the outside into single-ended through the protection circuit and the MAX490 level conversion chip The signal is read by the controller; the controller is connected to the SSI signal output module to output the SSI data signal generated after the execution of the firmware program, and the SSI signal acquisition module also converts the single-ended output SSI data signal through the protection circuit and the MAX490 level conversion chip It is two-way differential SSI data signal output for the reading of SSI signal acquisition device; the controller is connected to the 8M crystal oscillator module, and the 8M crystal oscillator module provides the global clock input for the FPGA to drive the execution of the firmware program; the controller is connected to the power supply input and the voltage regulator module , the power input and voltage stabilization module accepts an external 5V1A DC power input, which is divided into three power supply lines of 1.2V, 2.5V, and 3.3V after the level conversion chip; the 1.2V power supply line supplies power to the core of the FPGA chip, and the 2.5V line Supply power to some FPGA IO interfaces, 3.3V line to supply power to some FPGA IO interfaces and PROM storage modules, the models of the level conversion chips are LM2651 and LM2655; The access state of the power supply; the PROM program storage LED indicator is an in-line green light-emitting diode, indicating whether there is a firmware program stored in the PROM storage module.

There are 6 interfaces on both sides of the shell, 2 interfaces on one side, which are respectively DB9 single-channel SSI signal output interface and DB25 four-channel SSI signal output interface; the other side has 4 interfaces, which are power input and the voltage stabilization module LED indicator light observation window, power switch, power access hole and reset switch; DB9 single-channel SSI signal output interface is used to output single-channel SSI signal to the outside; DB25 four-channel SSI signal output interface is used to external Output four SSI signals; the power input and the LED indicator light observation window of the voltage stabilization module display the status of the LED indicator light; the power switch controls the on-off of the absolute encoder board; the power access hole is connected to the external 5V1A DC power adapter; The reset switch controls the reset operation of the absolute encoder.

The working process of the synchronous serial interface absolute encoder is as follows:

(1) Board initialization operation: After the board is powered on, the firmware program is read from the PROM storage module and starts to execute, initialize each register in the firmware program, and wait for the external SSI clock signal and the SSI data sent from the upper computer software of the mobile phone terminal Input of signal configuration parameters;

(2) SSI data signal configuration parameter acquisition operation: the board collects the SSI data signal configuration parameters sent from the upper computer software of the mobile phone terminal through Bluetooth low energy consumption, and distributes these parameters to each register of the firmware program, and prepares to output SSI data Signal;

(3) SSI data signal output operation: the board outputs the SSI data signal sinusoidally according to the collected SSI signal configuration parameters, the DB9 interface outputs a single SSI signal, and the DB25 interface synchronously outputs four SSI signals;

(4) Refresh and synchronization operation: When the board collects new SSI signal configuration parameters, it will wait for the bit width of the external SSI clock signal to be consistent with the bit width of the parameter setting data. When the consistent condition is reached, the board will continue to output the SSI data signal sinusoidally according to the new parameters, otherwise continue to wait.

Claims (7)

1. a kind of absolute value encoder simulation system based on synchronous serial interface signal, it is characterised in that：The system includes setting Put terminal and absolute value encoder simulation board；Set terminal by bluetooth discovery absolute value encoder simulate board, and by its It is displayed in list of devices；User sends these parameters to absolute encoder by setting terminal profile SSI signal parameters Device simulates board；The clamping of absolute value encoder analog board is received and sets the parameter that terminal sends, and SSI letters are generated according to these parameters Number, and SSI signals are exported by the serial line interface on board.

2. the absolute value encoder simulation system based on synchronous serial interface signal according to claim 1, its feature exists In：The SSI signal parameters include channel position, bit wide, minimum value, maximum and increment.

3. the absolute value encoder simulation system based on synchronous serial interface signal according to claim 1, its feature exists In：Connection status, MAC Address and the bluetooth of absolute value encoder simulation board of the terminal simultaneous display in list of devices are set Signal RSSI intensity levels.

4. the absolute value encoder simulation system based on synchronous serial interface signal according to claim 1, its feature exists In：The absolute value encoder simulation board includes that controller, bluetooth module, power module, power module indicator lamp, PROM are deposited Storage module, PROM program storages indicator lamp, crystal oscillator module, external timing signal acquisition module and SSI signal output modules；Wherein Bluetooth module, power module, PROM memory modules, crystal oscillator module, external timing signal acquisition module, SSI signal output modules It is connected with controller；Power module indicator lamp is connected with power input；PROM program storages indicator lamp and PROM memory modules It is connected.

5. the absolute value encoder simulation system based on synchronous serial interface signal according to claim 4, its feature exists In：On the controller after electricity, initial work is first completed, subsequently into wait state, wait external timing signal and setting The input signal of terminal；User is setting the parameter of the terminal SSI signals to be exported, and parameter is sent into absolute encoder Device simulates the bluetooth module of board；Send after SSI signal parameters and access external timing signal, controller enters SSI signals Output state, first gathers the SSI signal parameters that bluetooth module is received, and then generates SSI signals and passes through SSI signal output modules Output；User sends new SSI signal parameters again, and controller will gather new SSI signal parameters simultaneously from bluetooth module again New SSI signals are exported by SSI signal output modules.

6. the absolute value encoder simulation system based on synchronous serial interface signal according to claim 1, its feature exists In：The controller is based on FPGA, using 8MHz crystal oscillators, core operating voltage 1.2V, I/O interface operating voltage be 2.5V and 3.3V；Bluetooth module chip is CC2541, and its serial communication speed is 9600 baud rates；SSI signal output modules are used Level signal conversion chip is MAX490；Power module gives other all module for power supply, by being divided into after electrical level transferring chip The tunnel supply line of 1.2V, 2.5V, 3.3V tri-；Wherein 1.2V supply lines power to fpga chip core, and 2.5V circuits are to part FPGA I/O interfaces are powered, and 3.3V circuits are powered to part FPGA I/O interfaces and PROM memory modules；PROM program storages are indicated Lamp shows the working condition of PROM memory modules；Power module indicator lamp shows the working condition of power module；The system is also wrapped Shell is included, the side of shell there are 2 interfaces, be respectively DB9 single channel SSI signal output interfaces and the road SSI signal outputs of DB25 tetra- Interface；Opposite side has 4 interfaces, is respectively that power module indicator lamp watch window, power switch, plant-grid connection hole and reset are opened Close；DB9 single channel SSI signal output interfaces are used for the SSI signals to outside output single channel；The road SSI signal output interfaces of DB25 tetra- For to four road SSI signals of outside output；Power module indicator lamp watch window shows the state of the indicator lamp；Power switch control Absolute value encoder processed simulates cut-offfing for board；Plant-grid connection hole is connected with outside 5V1A DC power source adapters；Reset switch The reset operation of control absolute value encoder simulation board.

7. a kind of absolute value encoder simulation system based on synchronous serial signal according to claim 1, its feature exists In the setting terminal is made up of bluetooth equipment search module and signal parameter setup module；The bluetooth equipment search module The bluetooth equipment of surrounding is searched for and shown, the connection with selected bluetooth equipment is set up；Signal parameter setup module shows and selectes The RSSI intensity of the connection status, MAC Address and Bluetooth signal of bluetooth equipment, receives the SSI signal parameters of user input and incites somebody to action These parameters are sent on absolute value encoder simulation board.