National Instruments MyRIO-1950 Bedienungsanleitung

USER GUIDE AND SPECIFICATIONS

NI myRIO-1950

The National Instruments myRIO-1950 is an embedded reconfigurable I/O (RIO) device that

students can use to design control, robotics, and mechatronics systems. This document contains

pinouts, connectivity information, dimensions, mounting instructions, and specifications for the

NI myRIO-1950.

Figure 1. NI myRIO-1950

1 Reset Button

2 Power Connector

3 Device USB Connector

4 Host USB Connector

5 Mounting Hole Connected to Chassis Ground (x6)

6LEDs

7 DDR3 Memory

8UserButton

9 MXP Connector B, Pin 1

10 Processor/FPGA

11 MXP Connector A, Pin 1

POWER

STATUS

LED0

LED1

LED2

LED3

234

2|ni.com |NI myRIO-1950 User Guide and Specifications

Safety Information

Caution Do not operate the hardware in a manner not specified in this document

and in the user documentation. Misuse of the hardware can result in a hazard. You

can compromise the safety protection if the hardware is damaged in any way. If the

hardware is damaged, return it to National Instruments for repair.

Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely

dry and free from contaminants before returning it to service.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory requirements and limits for

electromagnetic compatibility (EMC) stated in the product specifications. These requirements

and limits provide reasonable protection against harmful interference when the product is

operated in the intended operational electromagnetic environment.

This product is intended for use in commercial locations. There is no guarantee that harmful

interference will not occur in a particular installation or when the product is connected to a test

object. To minimize interference with radio and television reception and prevent unacceptable

performance degradation, install and use this product in strict accordance with the instructions

in the product documentation.

Furthermore, any modifications to the product not expressly approved by National Instruments

could void your authority to operate it under your local regulatory rules.

Caution To ensure the specified EMC performance, the length of any cable

connected to the USB ports must be no longer than 3 m (10 ft), and the length of any

cable connected to the MXP ports must be no longer than 0.3 m (1 ft).

Caution To ensure the specified EMC performance, do not connect the power input

to a DC mains supply or to any supply requiring a connecting cable longer than 3 m

(10 ft). A DC mains supply is a local DC electricity supply network in the

infrastructure of a site or building.

NI myRIO-1950 User Guide and Specifications |© National Instruments |3

ESD Warning

Caution Although this product has been designed to be as robust as possible, ESD

(electrostatic discharge) can damage or upset this product. This product must be

protected at all times from ESD. Static charges may easily produce potentials of

several kilovolts on the human body or equipment, which can discharge without

detection. Industry-standard ESD precautions must be employed at all times.

The NI myRIO-1950 is designed and intended for use as a development platform for

hardware or software in an educational/professional laboratory environment. To

facilitate usage, the board is manufactured with its components and connecting traces

openly exposed to the operator and the environment. As a result, ESD sensitive

(ESDS) components on the board, such as the semiconductor integrated circuits, can

be damaged when exposed to an ESD event. To indicate the ESD sensitivity of the

NI myRIO-1950, it carries the symbol shown below.

4|ni.com |NI myRIO-1950 User Guide and Specifications

Hardware Overview

The NI myRIO-1950 provides analog input (AI), analog output (AO), digital input and output

(DIO), and power output in a compact embedded device. The NI myRIO-1950 connects to a host

computer over USB.

The following figure shows the arrangement and functions of NI myRIO-1950 components.

Figure 2. NI myRIO-1950 Hardware Block Diagram

Processor (LabVIEW RT)

FPGA (LabVIEW FPGA)

MXP A/B

(x2)

+3.3V

UART

4AI

2AO

16 16

DIO

DDR3

Nonvolatile

Memory

Watchdog

Status

LED

Reset

Button

USB Device

Port

USB Host

Port

Accelerometer Button0

Xilinx Zynq-7010

User

LEDs

NI myRIO-1950 User Guide and Specifications |© National Instruments |5

Connector Pinouts

NI myRIO-1950 Expansion Port (MXP) connectors A and B carry identical sets of signals. The

signals are distinguished in software by the connector name, as in ConnectorA/DIO1 and

ConnectorB/DIO1. Refer to the software documentation for information about configuring

and using signals. The following figure and table show the signals on MXP connectors A and B.

Note that some pins carry secondary functions as well as primary functions.

Figure 3. Primary/Secondary Signals on MXP Connectors A and B

Table 1. Descriptions of Signals on MXP Connectors A and B

Signal Name Reference Direction Description

+5V DGND Output +5 V power output.

AI <0..3> AGND Input 0-5 V, referenced, single-ended analog input

channels. Refer to the Analog Input

Channels section for more information.

AO <0..1> AGND Output 0-5 V referenced, single-ended analog

output. Refer to the Analog Output Channels

section for more information.

AGND N/A N/A Reference for analog input and output.

+3.3V DGND Output +3.3 V power output.

AO0

AO1

AGND

DGND

UART.RX

DGND

UART.TX

DGND

DIO11 / ENC.A

DGND

DIO12 / ENC.B

DGND

DIO13

DGND

DIO14 / I2C.SCL

DIO15 / I2C.SDA

+5V

AI1

AI3

AI2

DIO1

DIO2

DIO3

DIO4

AI0

DIO0

DIO5 / SPI.CLK

DIO6 / SPI.MISO

DIO7 / SPI.MOSI

DIO8/ PWM0

DIO9 / PWM1

DIO10 / PWM2

+3.3V

6|ni.com |NI myRIO-1950 User Guide and Specifications

Analog Input Channels

The NI myRIO-1950 has analog input channels on myRIO Expansion Port (MXP) connectors A

and B. The analog inputs are multiplexed to a single analog-to-digital converter (ADC) that

samples all channels.

MXP connectors A and B have four single-ended analog input channels per connector, AI0-AI3,

which you can use to measure 0-5 V signals.

Note For important information about improving measurement accuracy by

reducing noise, go to ni.com/info and enter the Info Code analogwiring.

Figure 4 shows the analog input topology of the NI myRIO-1950.

Figure 4. NI myRIO-1950 Analog Input Topology

DIO <0..15> DGND Input or

Output

General-purpose digital lines with 3.3 V

output, 3.3 V/5 V-compatible input. Refer to

the DIO Lines section for more information.

UART.RX DGND Input UART receive input. UART lines are

electrically identical to DIO lines.

UART.TX DGND Output UART transmit output. UART lines are

electrically identical to DIO lines.

DGND N/A N/A Reference for digital signals, +5 V, and +3.3 V.

Table 1. Descriptions of Signals on MXP Connectors A and B (Continued)

Signal Name Reference Direction Description

MUX ADC

AI0

AI1

AI2

AI3

AI0

AI1

AI2

AI3

0–5 V

MXP A

MXP B

NI myRIO-1950 User Guide and Specifications |© National Instruments |7

Analog Output Channels

The NI myRIO-1950 has analog output channels on myRIO Expansion Port (MXP) connectors

A and B. Each analog output channel has a dedicated digital-to-analog converter (DAC), so they

can all update simultaneously. The DACs for the analog output channels are controlled by a

serial communication bus from the FPGA. MXP connectors A and B share one bus Therefore,

the maximum update rate is specified as an aggregate figure in the Analog Output section of the

Specifications.

MXP connectors A and B have two analog output channels per connector, AO0 and AO1, which

you can use to generate 0-5 V signals.

Figure 5 shows the analog output topology of the NI myRIO-1950.

Figure 5. NI myRIO-1950 Analog Output Topology

Accelerometer

The NI myRIO-1950 contains a three-axis accelerometer. The accelerometer samples each axis

continuously and updates a readable register with the result. Refer to the Accelerometer section

of the Specifications for the accelerometer sample rates.

Converting Raw Data Values to Voltage

You can use the following equations to convert raw data values to volts:

V = Raw Data Value * LSB Weight

LSB Weight = Nominal Range ÷ 2ADC Resolution

where Raw Data Value is the value returned by the FPGA I/O Node,

LSB Weight is the value in volts of the increment between data values,

Nominal Range is the absolute value in volts of the full, peak-to-peak nominal range

of the channel,

and ADC Resolution is the resolution of the ADC in bits. (ADC Resolution = 12.)

DAC

0–5 V

MXP A

MXP B

AO0

AO1

AO0

AO1

8|ni.com |NI myRIO-1950 User Guide and Specifications

• For AI and AO channels on the MXP connectors,

LSB Weight = 5 V ÷ 212 = 1.221 mV

Maximum reading = 4095 * 1.221 mV = 4.999 V

• For the accelerometer,

LSB Weight = 16 g ÷ 212 = 3.906 mg

Maximum Positive Reading = +2047 * 3.906 mg = +7.996 g

Maximum Negative Reading = -2048 * 3.906 mg = -8.000 g

DIO Lines

The NI myRIO-1950 has 3.3 V general-purpose DIO lines on the MXP connectors. MXP

connectors A and B have 16 DIO lines per connector. Each DIO line from 0 to 13 has a 40 kΩ

pullup resistor to 3.3 V, and DIO lines 14 and 15 have 2.1 kΩ pullup resistors to 3.3 V. DGND

is the reference for all the DIO lines. You can program all the lines individually as inputs or

outputs. Secondary digital functions include Serial Peripheral Interface Bus (SPI), I2C,

pulse-width modulation (PWM), and quadrature encoder input. Refer to the NI myRIO software

documentation for information about configuring the DIO lines.

Figure 6. DIO Lines <13..0> on MXP Connector A or B

Figure 7. DIO Lines <15..14> on MXP Connector A or B

When a DIO line is floating, it floats in the direction of the pull resistor. A DIO line may be

floating in any of the following conditions:

• when the myRIO device is starting up

• when the line is configured as an input

• when the myRIO device is powering down

You can add a stronger resistor to a DIO line to cause it to float in the opposite direction.

40 kΩ

FPGA Bus Switch DIO<13..0>

+3.3V

2.1 kΩ

FPGA Bus Switch DIO<15..14>

+3.3V

NI myRIO-1950 User Guide and Specifications |© National Instruments |9

UART Lines

The NI myRIO-1950 has one UART receive input line and one UART transmit ouput line on

each MXP connector. The UART lines are electrically identical to DIO lines 0 to 13 on the MXP

connectors. Like those lines, UART.RX and UART.TX have 40 kΩ pullup resistors to 3.3 V.

Use LabVIEW Real-Time to read and write over the UART lines.

Using the Reset Button

Pressing and releasing the Reset button restarts the processor and the FPGA.

Pressing and holding the Reset button for 5 seconds, then releasing it, restarts the processor and

the FPGA and forces the NI myRIO-1950 into safe mode. In safe mode, the NI myRIO-1950

launches only the services necessary for updating configuration and installing software.

When the NI myRIO-1950 is in safe mode, you can communicate with it by using the UART

lines on MXP connector A. You need the following items to communicate with the myRIO

device over UART:

• USB-to-TTL serial UART converter cable (for example, part number

TTL-232RG-VSW3V3-WE from FTD Chip)

• Serial-port terminal program configured with the following settings:

• 115,200 bits per second

• Eight data bits

• No parity

• One stop bit

• No flow control

Using Button0

Button0 produces a logic TRUE when depressed and a logic FALSE when not depressed.

Button0 is not debounced.

Understanding LED Indications

Power LED

The Power LED is lit while the NI myRIO-1950 is powered on. This LED indicates that the

power supply connected to the device is adequate.

10 |ni.com |NI myRIO-1950 User Guide and Specifications

Status LED

The Status LED is off during normal operation. The NI myRIO-1950 runs a power-on self test

(POST) when you apply power to the device. During the POST, the Power and Status LEDs turn

on. When the Status LED turns off, the POST is complete. The NI myRIO-1950 indicates

specific error conditions by flashing the Status LED a certain number of times every few

seconds, as shown in Table 2.

LEDs 0-3

You can use LEDs 0-3 to help debug your application or easily retrieve application status. Logic

TRUE turns an LED on and logic FALSE turns an LED off.

Using the USB Host Port

The NI myRIO-1950 USB host port supports Web cameras that conform to the USB Video

Device Class (UVC) protocol as well as machine vision cameras that conform to the USB3

Vision standard and are USB 2.0 backward compatible. The NI myRIO-1950 USB host port also

supports Basler ace USB3 cameras.

The NI myRIO-1950 USB host port also supports USB Flash drives and USB-to-IDE adapters

formatted with FAT16 and FAT32 file systems. LabVIEW usually maps USB devices to the /U,

/V, /W, or /X drive, starting with the /U drive if it is available.

Table 2. Status LED Indications

Number of Flashes

Every Few Seconds Indication

2The device has detected an error in its software. This usually occurs when

an attempt to upgrade the software is interrupted. Reinstall software on

the device.

3The device is in safe mode.

4The software has crashed twice without rebooting or cycling power

between crashes. This usually occurs when the device runs out of

memory. Review your RT VI and check the memory usage. Modify

the VI as necessary to solve the memory usage issue.

Continuously flashing or

solid

The device has detected an unrecoverable error. Contact National

Instruments.

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