National Instruments Marine RADAR NI USB 6525 User Manual
USER GUIDE AND SPECIFICATIONS  
NI USB-6525  
This user guide describes how to use the National Instruments USB-6525  
data acquisition (DAQ) device.  
Introduction  
The NI USB-6525 is a full-speed USB 2.0 device that provides  
eight 60 VDC channel-to-channel isolated digital inputs (DI),  
eight 60 VDC/30 Vrms channel-to-channel isolated solid-state relay (SSR)  
outputs, and a 32-bit counter.  
1
1
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Figure 1. USB-6525 Top View  
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Refer to the Safety Guidelines section of this document for important safety  
information.  
Setting Up Hardware  
Complete the following steps to set up the hardware:  
1. Install combicon screw terminal blocks by inserting them into the  
combicon jacks.  
Note The USB-6525 kit ships with signal labels. You can apply the signal labels on the  
screw terminal blocks for easy signal identification.  
2. Refer to Table 1 and Figure 4 for label orientation and affix provided  
signal labels to the screw terminal blocks. Insert the screw terminal  
blocks into their respective matching combicon jacks. Refer to  
Figure 4 for more information about signal label orientation.  
4
3
1
2
3
4
1
2
Overlay Label with Pin Orientation Guides  
Combicon Jack  
3
4
Screw Terminal Blocks  
Signal Labels  
Figure 4. Signal Label Application Diagram  
3. Connect the wiring to the appropriate screw terminals.  
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I/O Connector  
The USB-6525 device ships with two detachable terminal blocks for digital  
signals. Each individual terminal accepts a wire gauge between  
16 AWG–28 AWG.  
Table 1. Digital Terminal Assignments  
Module  
Terminal  
Signal  
P0.0A  
P0.0B  
P0.1A  
P0.1B  
P0.2A  
P0.2B  
P0.3A  
P0.3B  
P0.4A  
P0.4B  
P0.5A  
P0.5B  
P0.6A  
P0.6B  
P0.7A  
P0.7B  
Module  
Terminal  
17  
Signal  
P1.0+  
1
2
18  
P1.0–  
3
19  
P1.1+  
4
20  
P1.1–  
5
21  
P1.2+  
6
22  
P1.2–  
7
23  
P1.3+  
8
24  
P1.3–  
9
25  
P1.4+  
10  
11  
12  
13  
14  
15  
16  
26  
P1.4–  
27  
P1.5+  
28  
P1.5–  
29  
P1.6+  
30  
P1.6–  
31  
P1.7+/PFI 0+  
P1.7–/PFI 0–  
32  
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Signal Descriptions  
Table 2 describes the signals available on the I/O connectors.  
Table 2. Signal Descriptions  
Signal Name  
P0.<0..7>A/B  
Direction  
Output  
Input  
Description  
Solid-state relay 60 VDC/30 Vrms (42.4 Vpk) output  
60 VDC digital input.  
P1.<0..6>+/–  
P1.<0..6>+ corresponds to the positive input terminal.  
P1.<0..6>– corresponds to the negative input terminal.  
P1.7+/– or PFI 0+/–  
Input  
This channel is configurable as either a digital input or  
an event counter.  
Digital Input Signal— 60 VDC digital input.  
P1.7+ corresponds to the positive input terminal.  
P1.7– corresponds to the negative input terminal.  
CTR—As a counter, this signal can be used as an event  
counter input source.  
PFI 0+ corresponds to the positive counter terminal.  
PFI 0– corresponds to the negative counter terminal.  
Digital I/O  
USB-6525 has eight channel-to-channel optically isolated inputs,  
P1.<0..7>, and eight channel-to-channel optically isolated solid-state relay  
outputs, P0.<0..7>. P1.7/PFI 0 can also function as a 32-bit counter. Refer  
to the Event Counter section for more information about the counter.  
Optically Isolated Inputs  
The USB-6525 provides eight channels of isolated digital inputs. These  
inputs consist of an optocoupler, a depletion-mode MOSFET-based  
current-limiting circuit, and Schottky diode.  
Each channel has its own positive and negative terminals. The input range  
on the channels is –60 VDC to +60 VDC.  
Sensing DC Voltages  
The USB-6525 detects a wide range of DC signals, from TTL-like logic  
levels to DC power supply levels up to 60 V.  
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Applying a DC voltage of at least 3.2 V across two input terminals registers  
logic high. Applying no voltage or a voltage difference of 1 V or less  
registers logic low. DC voltages between 1 V and 3.2 V may not register a  
consistent or usable value.  
Signal Connection Example  
Figure 5 shows signal connections for a power supply and load connected  
to an isolated input.  
Vcc  
MOSFET-Based  
Current-Limiting  
Circuitry  
P1.x+  
P1.x–  
Digital  
Logic  
+
Vsupply  
_
Load  
Twisted-Pair  
Wiring  
Computer  
Ground  
Schottky  
Isolation  
USB-6525  
Figure 5. Connecting a Power Supply and Load to the Isolated Input  
Caution Use twisted-pair field wiring to reduce EMC noise.  
In Figure 5, the USB-6525 is sensing a powered load that is connected to  
the power supply through a switch.  
Note Power supplies must be within the USB-6525 device range. Refer to the  
Specifications section for information about these ranges.  
When the switch is open, no current flows through the load and no voltage  
is applied to the load or to the USB-6525 input. The digital logic of the  
USB-6525 then registers a logic low for the channel. When the switch is  
closed, current flows through both the load and the USB-6525 optocoupler,  
and the USB-6525 registers a logic high for the channel.  
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Solid-State Relay (SSR) Outputs  
You can connect loads to the USB-6525. Connect the load to one of the  
leads of the power source. Connect either the P0.xA or the P0.xB terminal  
to the load and the other terminal to the other lead of the AC or DC power  
source. Figure 6 shows a possible configuration where the load is  
connected to the P0.xB terminal and the DC or AC power source.  
Twisted-Pair  
Wiring  
P0.xA  
+
or  
_
AC  
Load  
P0.xB  
USB-6525  
Figure 6. Connecting a Load to the USB-6525  
Caution Use twisted-pair field wiring to reduce EMC noise.  
Power-On and Power-Off Conditions  
The default power-on state of the solid-state relays is open. By default, the  
solid-state relays remain open when the chassis and the USB-6525 device  
are powered off.  
Protecting Inductive Loads  
When inductive loads are connected to the USB-6525 SSR outputs, a large  
counter-electromotive force may occur at switching time because of the  
energy stored in the inductive load. These flyback voltages can damage the  
SSR outputs and/or the external power supply.  
Limit flyback voltages at your inductive load by installing one of the  
following:  
•
•
For DC loads—Install a flyback diode within 18 in. of the load.  
For AC loads—Install a metal oxide varistor (MOV) rated for 30 Vrms  
or slightly higher.  
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Figures 7 and 8 show examples of using an external flyback diode to  
protect DC inductive loads and an MOV to protect AC inductive loads,  
respectively.  
Flyback Diode for  
DC Inductive Loads  
P0.xA  
Inductive  
Load  
+
–
VDC  
P0.xB  
USB-6525  
Figure 7. Contact Protection for DC Inductive Loads  
MOV for AC  
Inductive Loads  
P0.xA  
Inductive  
VAC  
Load  
P0.xB  
USB-6525  
Figure 8. Contact Protection for AC Inductive Loads  
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Using the USB-6525 as a TTL Output Device  
Figure 9 shows a signal connection example for a TTL-level application  
with an external supply voltage of +5 V.  
To External  
+5 V Supply  
P0.xA  
P0.xB  
VOUT  
Isolated  
Ground  
USB-6525  
Figure 9. TTL Device Signal Connection Example  
When the SSR is open, a small amount of current flows through RL and the  
output voltage is close to 5 V, a logic high. When the SSR is closed, current  
flows through RL and the output voltage is close to 0 V, a logic low.  
Choose an RL value small enough to provide the necessary source current  
but large enough to reduce sink current and to avoid consuming  
unnecessary power. Many TTL-level applications use an RL value of 5 kΩ.  
Event Counter  
You can configure PFI 0 (an alias to P1.7) as the source for a 32-bit counter.  
In this mode, the device counts low to high transitions on P1.7. The counter  
can be armed and disarmed and the count can be read or reset through  
software. For more information about event timing requirements, refer to  
the Specifications section. Refer to your software documentation for more  
information about counter programming techniques.  
Specifications  
The following specifications are typical at 25 °C, unless otherwise noted.  
Isolated Inputs  
Number of input channels...................... 8, ch-ch isolated  
Input voltage range................................. –60 VDC to 60 VDC  
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Level  
Min  
Max  
Input low voltage  
Input high voltage  
–60 VDC  
3.2 VDC  
1 VDC  
60 VDC  
Input current ...........................................3.0 mA/channel max  
Solid-State Relay Outputs  
Number of output channels.....................8, ch-ch isolated  
Relay type...............................................Normally open solid-state  
relay (SSR)  
Switching voltage ...................................60 VDC/30 Vrms max  
Switching current (per channel)..............500 mA max, full operation  
temperature range  
Switching rate (90% duty cycle) ............5 operations per second  
Relay open time......................................60 μs typ  
Relay close time......................................1.2 ms typ  
On resistance...........................................550 mΩ max  
Off state leakage .....................................0.6 μA typ  
Counter  
Number of counters ................................1 (P1.7 can be configured  
as a counter)  
Resolution...............................................32 bits  
Counter measurements ...........................Rising edge counting  
Maximum input frequency .....................5 KHz  
Minimum high pulse width.....................20 μs  
Minimum low pulse width......................180 μs  
Bus Interface  
USB specification...................................USB 2.0 full-speed (12 Mb/s)  
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Power Requirements  
USB  
Input voltage ................................... 4.5 to 5.25 VDC in  
configured state  
Active current ................................. 150 mA max  
Suspend current............................... 350 μA typ  
Physical Characteristics  
Dimensions  
Without connectors......................... 6.35 cm × 8.51 cm × 2.31 cm  
(2.50 in. × 3.35 in. × 0.91 in.)  
With connectors .............................. 8.18 cm × 8.51 cm × 2.31 cm  
(3.22 in. × 3.35 in. × 0.91 in.)  
I/O connectors........................................ USB series B receptacle,  
(2) 16 position (screw terminal)  
plug headers  
Screw-terminal wiring............................ 16 to 28 AWG copper conductor  
wire with 10 mm (0.39 in.) of  
insulation stripped from the end  
Torque for screw terminals .................... 0.22 – 0.25 N · m  
(2.0 – 2.2 lb · in.)  
Weight  
With connectors .............................. Approx. 87 g (3.1 oz)  
Without connectors......................... Approx. 64 g (2.3 oz)  
Safety  
Standards  
The USB-6525 is designed to meet the requirements of the following  
standards of safety for electrical equipment for measurement, control,  
and laboratory use:  
•
•
IEC 61010-1, EN 61010-1  
UL 61010-1, CSA 61010-1  
Note For UL and other safety certifications, refer to the product label, or visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
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Isolation  
Channel-to-channel.................................60 VDC continuous  
Channel-to-earth ground.........................60 VDC continuous  
Withstand................................................60 VDC continuous  
Caution Do not use this module for connection to signals or for measurements within  
Measurement Categories II, III, or IV.  
Hazardous Locations  
The USB-6525 is not certified for use in hazardous locations.  
Environmental  
The USB-6525 device is intended for indoor use only.  
Operating temperature  
(IEC 60068-2-1 and IEC 60068-2-2)......0 to 55 °C  
Operating humidity  
(IEC 60068-2-56) ...................................10 to 90% RH, noncondensing  
Maximum altitude...................................2,000 m (at 25 °C ambient  
temperature)  
Storage temperature  
(IEC 60068-2-1 and IEC 60068-2-2)......–40 to 85 °C  
Storage humidity  
(IEC 60068-2-56) ...................................5 to 90% RH, noncondensing  
Pollution Degree (IEC 60664)................2  
Electromagnetic Compatibility  
This product is designed to meet the requirements of the following  
standards of EMC for electrical equipment for measurement, control,  
and laboratory use:  
•
•
•
EN 61326 EMC requirements; Minimum Immunity  
EN 55011 Emissions; Group 1, Class A  
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A  
Note For EMC compliance, operate this device according to product documentation.  
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CE Compliance  
This product meets the essential requirements of applicable European  
Directives, as amended for CE marking, as follows:  
•
•
73/23/EEC; Low-Voltage Directive (safety)  
89/336/EEC; Electromagnetic Compatibility Directive (EMC)  
Note Refer to the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Waste Electrical and Electronic Equipment (WEEE)  
EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling  
center. For more information about WEEE recycling centers and National Instruments  
WEEE initiatives, visit ni.com/environment/weee.htm.  
Safety Guidelines  
Caution Operate the hardware only as described in these operating instructions.  
The following section contains important safety information that you must  
follow when installing and using the USB-6525.  
Do not operate the USB-6525 in a manner not specified in this document.  
Misuse of the device can result in a hazard. You can compromise the safety  
protection built into the device if the device is damaged in any way. If the  
device is damaged, contact National Instruments for repair.  
Do not substitute parts or modify the device except as described in this  
document. Use the device only with the chassis, modules, accessories, and  
cables specified in the installation instructions. You must have all covers  
and filler panels installed during operation of the device.  
Do not operate the device in an explosive atmosphere or where there may  
be flammable gases or fumes. If you must operate the device in such an  
environment, it must be in a suitably rated enclosure.  
If you need to clean the device, use a dry cloth. Make sure that the device  
is completely dry and free from contaminants before returning it to service.  
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Operate the device only at or below Pollution Degree 2. Pollution is foreign  
matter in a solid, liquid, or gaseous state that can reduce dielectric strength  
or surface resistivity. The following is a description of pollution degrees:  
•
Pollution Degree 1 means no pollution or only dry, nonconductive  
pollution occurs. The pollution has no influence.  
•
Pollution Degree 2 means that only nonconductive pollution occurs in  
most cases. Occasionally, however, a temporary conductivity caused  
by condensation must be expected.  
•
Pollution Degree 3 means that conductive pollution occurs, or dry,  
nonconductive pollution occurs that becomes conductive due to  
condensation.  
You must insulate signal connections for the maximum voltage for which  
the device is rated. Do not exceed the maximum ratings for the device. Do  
not install wiring while the device is live with electrical signals. Do not  
remove or add connector blocks when power is connected to the system.  
Avoid contact between your body and the connector block signal when hot  
swapping modules. Remove power from signal lines before connecting  
them to or disconnecting them from the device.  
Operate the device at or below the Measurement Category I1. Measurement  
circuits are subjected to working voltages2 and transient stresses  
(overvoltage) from the circuit to which they are connected during  
measurement or test. Measurement categories establish standard impulse  
withstand voltage levels that commonly occur in electrical distribution  
systems. The following is a description of measurement categories:  
•
Measurement Category I is for measurements performed on circuits  
not directly connected to the electrical distribution system referred to  
as MAINS3 voltage. This category is for measurements of voltages  
from specially protected secondary circuits. Such voltage  
measurements include signal levels, special equipment, limited-energy  
parts of equipment, circuits powered by regulated low-voltage sources,  
and electronics.  
•
Measurement Category II is for measurements performed on circuits  
directly connected to the electrical distribution system. This category  
refers to local-level electrical distribution, such as that provided by a  
standard wall outlet (for example, 115 V for U.S. or 230 V for Europe).  
Examples of Measurement Category II are measurements performed  
on household appliances, portable tools, and similar USB devices.  
1
Measurement Category as defined in electrical safety standard IEC 61010-1. Measurement Category is also referred to as  
Installation Category.  
2
3
Working Voltage is the highest rms value of an AC or DC voltage that can occur across any particular insulation.  
MAINS is defined as a hazardous live electrical supply system that powers equipment. Suitably rated measuring circuits may  
be connected to the MAINS for measuring purposes.  
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•
Measurement Category III is for measurements performed in the  
building installation at the distribution level. This category refers to  
measurements on hard-wired equipment such as equipment in fixed  
installations, distribution boards, and circuit breakers. Other examples  
are wiring, including cables, bus-bars, junction boxes, switches,  
socket-outlets in the fixed installation, and stationary motors with  
permanent connections to fixed installations.  
Measurement Category IV is for measurements performed at the primary  
electrical supply installation (<1,000 V). Examples include electricity  
meters and measurements on primary overcurrent protection devices and  
on ripple control units.  
Where to Go for Support  
The National Instruments Web site 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.  
A Declaration of Conformity (DoC) is our claim of compliance with the  
Council of the European Communities using the manufacturer’s  
declaration of conformity. This system affords the user protection for  
electronic compatibility (EMC) and product safety. You can obtain the DoC  
for your product by visiting ni.com/certification. If your product  
supports calibration, you can obtain the calibration certificate for your  
product at ni.com/calibration.  
National Instruments corporate headquarters is located at  
11500 North Mopac Expressway, Austin, Texas, 78759-3504.  
National Instruments also has offices located around the world to help  
address your support needs. For telephone support in the United States,  
create your service request at ni.com/support and follow the calling  
instructions or dial 512 795 8248. For telephone support outside the United  
States, contact your local branch office:  
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Netherlands 31 0 348 433 466, New Zealand 0800 553 322,  
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National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
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names of their respective companies. For patents covering National Instruments products, refer to the  
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© 2006 National Instruments Corporation. All rights reserved.  
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