National Instruments R Series User manual

USER MANUAL
NI USB-7855R OEM
R Series for USB Multifunction RIO with Kintex-7 70T FPGA
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This document provides dimensions, connectivity information, and pinouts for the National
Instruments USB-7855R OEM device.
Caution National Instruments makes no product safety, electromagnetic
compatibility (EMC), or CE marking compliance claims for NI USB-7855R OEM
device. The end-product supplier is responsible for conformity to any and all
compliance requirements.
Caution Do not operate the NI USB-7855R OEM device in a manner not
specified in this user manual. Product misuse can result in a hazard. You can
compromise the safety protection built into the product if the product is damaged in
any way. If the product is damaged, return it to National Instruments for repair.
Hardware Overview
The following high-level block diagram represents the NI USB-7855R OEM device.

Figure 1. USB-7855R OEM Device Block Diagram
Device
Temperature
Overvoltage
Protection
Overvoltage
Protection
FPGA
Temperature
40 MHz
OSC
AO (x8)
USB
NI ASICKintex-7
FPGA
NI USB-7855R OEM
Flash
Memory
DIO
+5 V
Reference
DAC AO
ADC AI
CONNECTOR 1 CONNECTOR 2 CONNECTOR 3CONNECTOR 0
Data/
Address/
Control
AI (x8)
INA
DIO (x16)
DIO (x16)
DIO (x16)
Overvoltage
Protection
Overvoltage
Protection
Overvoltage
Protection
2 | NI USB-7855R OEM User Manual | ni.com

Parts Locator
7
8
1
2
3
4
6
5
1. USB Connector
2. Power Supply Connector
3. Power Switch
4. External LED Attachments
5. Connector 0 (Analog)
6. Connector 1 (Digital)
7. Connector 2 (Digital)
8. Connector 3 (Digital)
USB-7855R OEM Device Components
The following table lists the interfacing components on the NI USB-7855R OEM device and
the component manufacturers.
Table 1. USB-7855R OEM Device Components
Components Reference Designator Manufacturer
LEDs DS2, DS5, DS7, DS8, DS10 SunLED (XZBB54W-1TN)
DS4 Everlight Electronic (QTLP630C-2 T/R)
USB connector J5 Tyco (292304-1)
Power connector J1, J2, & J9 Phoenix Contact (1727566)
Power switch SW2 C&K (E101J1AQE2)
The following table lists and describes the I/O connectors on the NI USB-7855R OEM device.
Refer to the connector manufacturer for information about using and matching these
connectors.
NI USB-7855R OEM User Manual | © National Instruments | 3

Table 2. USB-7855R OEM Device Connectors
Connector Description Reference Designator Manufacturer
AI, AO 50-position header P2 3M (N2550-6002RB)
DIO 34-position header J9 3M (N2534-6002RB)
External LED 7-position header E1 FCI 68000-107LF
4 | NI USB-7855R OEM User Manual | ni.com

Dimensions
2X .175 (4.45)
2X 2.863 (72.72)
2X 6.055 (153.81)
6.263 (159.08)
2X 6.675 (169.55)
.119 (3.02)
.000 (0)
2X 6.435 (163.46)
3X .285 (7.24)
3X 6.115 (155.32)
6.400 (162.56)
2.055 (52.19) 3.797 (96.44) 2X 5.838 (148.29)
.000 (0)
0.285 (7.24)
NI USB-7855R OEM User Manual | © National Instruments | 5

5.830 (148.08)
2.688 (68.28)
6.500 (165.1)
3.812 (96.82)
Note Visit ni.com/dimensions for more information about the dimensions of
the NI USB-7855R OEM device, including two-dimensional drawings and three-
dimensional models.
Note The NI USB-7855R OEM device has plated mounting holes that can act as
chassis ground.
Connecting the USB-7855R OEM Device
The NI USB-7855R OEM device provides connections for eight analog input (AI) channels,
eight analog output (AO) channels, and forty-eight digital input/output (DIO) channels, as
shown in Figure 2.
6 | NI USB-7855R OEM User Manual | ni.com

Figure 2. USB-7855R OEM Device Pinout
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
2
4
6
9
10
12
14
16
18
20
22
24
26
28
30
32
34
Connector 1
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
2
4
6
9
10
12
14
16
18
20
22
24
26
28
30
32
34
Connector 3
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
7
9
11
13
15
17
19
21
23
25
27
29
31
33
9
10
12
14
16
18
20
22
24
26
28
30
32
34
DIO0
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
DIO9
DIO10
DIO11
DIO12
DIO13
DIO14
DIO15
GND
1
3
5
2
4
6
Connector 2
Connector 0
AI0-
AIGND
AI1-
AIGND
AI2-
AIGND
AI3-
AIGND
AI4-
AIGND
AI5-
AIGND
AI6-
AIGND
AI7-
AISENSE
AO0
AO1
AO2
AO3
AO4
AO5
AO6
AO7
+5V
AI0+
AIGND
AI1+
AIGND
AI2+
AIGND
AI3+
AIGND
AI4+
AIGND
AI5+
AIGND
AI6+
AIGND
AI7+
AIGND
AOGND
AOGND
AOGND
AOGND
AOGND
AOGND
AOGND
AOGND
+5V 50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
Analog Input
The NI USB-7855R OEM device provides connections for eight AI channels. Each channel
has an AI+ pin, AI- pin, and AIGND pin to which you can connect both single-ended or
differential voltage signals. Use the AISENSE pin to connect non-referenced single-ended
signals.
Connecting Single-Ended Voltage Signals
To connect referenced single-ended voltage signals to the NI USB-7855R OEM device, you
must connect the voltage ground signal to AI GND in order to keep the common-mode voltage
in the specified range, as shown in Figure 3.
Figure 3. Connecting Referenced Single-Ended Signals to the USB-7855R OEM Device
PGIA ADC
AI+
NI USB-7855R OEM
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
NI USB-7855R OEM User Manual | © National Instruments | 7

To connect non-referenced single-ended voltage signals to the NI USB-7855R OEM device,
you must connect the voltage ground signal to AI SENSE in order to keep the common-mode
voltage in the specified range, as shown in Figure 4.
Figure 4. Connecting Non-Referenced Single-Ended Signals to the USB-7855R OEM Device
PGIA ADC
AI+
NI USB-7855R OEM
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
Connecting Differential Voltage Signals
You can connect grounded or floating differential signal sources to the NI USB-7855R OEM
device. Connect the positive voltage signal to the AI+ and the negative voltage signal to AI-.
To connect grounded differential signals to the NI USB-7855R OEM device, you must also
connect the signal reference to AI GND.
Figure 5. Connecting Grounded Differential Signals to the USB-7855R OEM Device
PGIA ADC
AI+
NI USB-7855R OEM
AISENSE
AIGND
Vcm
V1
+
–
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
To connect floating differential signals to the NI USB-7855R OEM device, you must connect
the negative and positive signals to AI GND through 1 MΩ resistors to keep the voltage within
the common-mode voltage range. If the voltage source is outside the common-mode voltage
range, the NI USB-7855R OEM device does not read data accurately.
8 | NI USB-7855R OEM User Manual | ni.com

Figure 6. Connecting Floating Differential Signals to the USB-7855R OEM Device
PGIA ADC
AI+
NI USB-7855R OEM
AISENSE
AIGND
V1
+
–
Overvoltage
Protection
AI– Overvoltage
Protection
Overvoltage
Protection
1 MΩ
Resistor
1 MΩ
Resistor
Analog Output
The NI USB-7855R OEM device provides connections for eight analog output channels. Each
channel has an AO pin and AOGND pin to which you can connect a load.
Figure 7. Connecting a Load
NI USB-7855R OEM
AOGND
LOAD
AO
DAC
Digital I/O
The NI USB-7855R OEM device provides connections for 48 digital input/output (DIO)
channels. Connector 1, Connector 2, and Connector 3 contains 16 low-speed channels that can
run up to 10 MHz signal frequencies. Each connector has selectable logic levels that you can
configure as 1.2 V, 1.5 V, 1.8 V, 2.5 V, or 3.3 V. You can configure each channel as input or
output.
NI USB-7855R OEM User Manual | © National Instruments | 9

Figure 8. Connecting to the DIO Channels
NI USB-7855R OEM
Power
FPGA
Connector X/ DIO0
Connector X/ DIO1
Connector X/ DIO14
Connector X/ DIO15
2
1
1. Low-speed signal frequencies up to 10 MHz with logic levels configured as 1.2 V, 1.5 V, 1.8 V, 2.5 V, or
3.3 V. Connectors 1 and 2 share the same voltage settings.
2. LED
The DIO channels connect to the FPGA through buffers, which have overvoltage and
undervoltage protection as well as over current protection. Refer to the NI USB-7855R OEM
device Specifications for more information about the maximum voltage and current.
When the system powers on, the DIO channels are set as input low with pull-down resistors.
To set another power-on state, you can configure the NI USB-7855R OEM device to load a VI
when the system powers on. The VI can then set the DIO lines to any power-on state.
National Instruments recommends performing signal integrity measurements to test the effect
of signal routing with the cable and connection accessory for your application.
LEDs
If you are putting the NI USB-7855R OEM device in an enclosure, you can either seat the
optional lightpipes on the device or attach external LEDs, as described in the Attaching
External LEDs section. When the lightpipes are attached, the top row is Error, USB Ready,
and POWER LEDs, and the bottom row has the User LEDs.
The NI USB-7855R OEM device has six LEDs which reflect the device state.
Table 3. LED Descriptions
LED Description Location
POWER Solid blue when the power is on 6
USB READY Solid blue when the USB is ready 3
10 | NI USB-7855R OEM User Manual | ni.com

Table 3. LED Descriptions (Continued)
LED Description Location
ERROR Solid red for error cases 2
USER1 Blue, user-defined 1
USER2 Blue, user-defined 4
USER3 Blue, user-defined 5
Attaching External LEDs
Seven connectors on the device in the E1 part —1, 2, 3, 4, 5, 6, and 7— allow you to connect
an external LED circuit to the device, as shown in Figure 10.
For example, to connect an external USB READY LED, use 7 as the positive connection (+5
V) and 3 and the negative connection.
To connect the remaining LEDs, refer to Table 3.
National Instruments recommends that you limit the current to 10 mA per LED. You can limit
this current by using external resistors, as shown in Figure 9.
Figure 9. External LEDs
1234567
NI USB-7855R OEM User Manual | © National Instruments | 11

Figure 10. Attaching External LEDs
External
LED
+5 V
OEM (On-Board)
761
External
Resistor
Power Switch
Use the power switch to power the NI USB-7855R OEM device on and off. The following
figure shows the pins on the power switch and power circuitry.
Figure 11. Power Switch (Shown in the On Position)
VDC Out
100 kΩ
to Ground VDC In
Switch
123
NC NC
SW2
SW2
3
Power to
Device
J8
Power
Connector
1
2
1
2
Connector
J8
12
F1
ON
ON
100 kΩ
100 kΩ
The following table lists the pin locations and signal descriptions.
12 | NI USB-7855R OEM User Manual | ni.com

Table 4. Power Switch Pin Descriptions
Pin Signal Description
1 VDC In Connects to VDC through a non-user replaceable fuse (reference
designator F1). The VDC is the voltage provided by the power
supply through pin 2 of the power connector (reference designator
J8) and must be 9 V to 30 V, 20 W.
2 VDC Out Provides power to the circuitry on the NI USB-7855R OEM device.
When the switch is in the on position, the VDC power supply from
pin 1 is routed to pin 2.
3 100 kΩ to
Ground
Connects pin 2 to ground through a 100 kΩ resistor when the switch
is in the off position.
+5 V Power Source
Use the +5 V terminals on the I/O connector supply +5 V referenced to DGND to power
external circuitry.
Caution Never connect the +5 V power terminals to analog or digital ground or
any other voltage source on the NI USB-7855R OEM device or any other device.
Doing so can damage the device and the computer. National Instruments is not liable
for damage resulting from such a connection.
The power rating is 4.75 to 5.1 VDC at 0.5 A.
Autonomous Mode
You can run the NI USB-7855R OEM device without a USB connection to a host computer
using Autonomous Mode. To collect data the NI USB-7855R OEM device acquires in
Autonomous Mode, you must reconnect the NI USB-7855R OEM device to a host computer.
Caution Data is lost and is not recoverable upon reconnection if a DMA FIFO
overflows while the NI USB-7855R OEM device is disconnected from the host
computer or if the NI USB-7855R OEM device loses power at any point.
Autonomous Mode includes the following capabilities.
NI USB-7855R OEM User Manual | © National Instruments | 13

Table 5. Autonomous Mode Capabilities
Capability Description
Use the Open/Close FPGA
Reference VI functions to run
an FPGA VI and then
disconnect the USB cable.
Call the Close FPGA VI Reference Function without
aborting or resetting the FPGA VI before you disconnect
the USB cable.1
After you disconnect the USB cable, any VI running on the
NI USB-7855R OEM device continues to run and collect
data, which can later be retrieved by reconnecting the USB
cable and re-opening the original FPGA reference.
Use Interactive Front Panel
Communication to run an
FPGA VI and then
disconnecting the USB cable.
The front panel indicators stop updating.
After you disconnect the USB cable, any VI running on the
NI USB-7855R OEM device continues to run. Restore the
Interactive Front Panel Communication by reconnecting the
USB cable.
Download the bitfile to flash
memory and set it to run when
loaded to FPGA.
Download the bitfile to flash memory and set it to run when
loaded to FPGA. The bitfile automatically starts running
whenever power is applied to the NI USB-7855R OEM
device. To collect data, you must reconnect the NI
USB-7855R OEM device to a host computer before
powering off the device.
Refer to the LabVIEW FPGA Module Help for more
information about downloading an FPGA VI to the flash
memory.
Worldwide Support and Services
The National Instruments website is your complete resource for technical support. At ni.com/
support you have access to everything from troubleshooting and application development self-
help resources to email and phone assistance from NI Application Engineers.
Visit ni.com/services for NI Factory Installation Services, repairs, extended warranty, and
other services.
Visit ni.com/register to register your National Instruments product. Product registration
facilitates technical support and ensures that you receive important information updates from
NI.
National Instruments corporate headquarters is located at 11500 North Mopac Expressway,
Austin, Texas, 78759-3504. National Instruments also has offices located around the world.
For telephone support in the United States, create your service request at ni.com/support or
1The Host VI errors out if you do not call the Close FPGA VI Reference Function without aborting
or resetting the FPGA VI.
14 | NI USB-7855R OEM User Manual | ni.com

dial 512 795 8248. For telephone support outside the United States, visit the Worldwide
Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-
date contact information, support phone numbers, email addresses, and current events.
NI USB-7855R OEM User Manual | © National Instruments | 15

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Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents
covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the
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© 2013 National Instruments. All rights reserved.
374229A-01 Nov13