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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 USB Cable Strain Relief
Figure 1. USB-6525 Top View
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Figure 2. USB-6525 Back View Installing Software Software support for the USB-6525 for Windows 2000/XP is provided by NI-DAQmx. The NI-DAQmx CD contains example programs that you can use to get started programming with the USB-6525. Refer to the NI-DAQmx for USB Devices Getting Started Guide, that shipped with your device and is also accessible from Start»All Programs»National Instruments»NI-DAQ for more information. Note For information about non-Windows operating system support, refer to
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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 termi
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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 Module Terminal Signal 1 P0.0A 17 P1.0+ 2 P0.0B 18 P1.0– 3 P0.1A 19 P1.1+ 4 P0.1B 20 P1.1– 5 P0.2A 21 P1.2+ 6 P0.2B 22 P1.2– 7 P0.3A 23 P1.3+ 8 P0.3B 24 P1.3– 9 P0.4A 25 P1.4+ 10 P0.4B 26 P1.4– 11 P0.5A 27 P1.5+ 12 P0.5B 28 P1.5– 13 P0.6A 29 P1.6+ 14 P0.6B 30 P1.6– 15
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Signal Descriptions Table 2 describes the signals available on the I/O connectors. Table 2. Signal Descriptions Signal Name Direction Description P0.<0..7>A/B Output Solid-state relay 60 VDC/30 Vrms (42.4 V ) output pk P1.<0..6>+/– Input ±60 VDC digital input. 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
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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 P1.x+ Digital Current-Limiting Logic Circuitry Vsupply Load Twisted-Pair Computer Wiring Ground P1.x– Schott
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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 P0.x A Wiring or AC Load P0.xB USB-6525 Figure 6. Connecting a Load to the USB-6525 Caution Use twist
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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.x A Inductive + V DC Load – P0.xB USB-6525 Figure 7. Contact Protection for DC Inductive Loads MOV for AC Inductive Loads P0.x A Inductive V AC Load P0.xB USB-6525 Figure 8. Contact Protection for AC Inductive Loads USB-6525 User Guide and Specifications 8 ni.com
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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.x A V OUT P0.xB Isolated Ground USB-6525 Figure 9. TTL Device Signal Connection Example When the SSR is open, a small amount of current flows through R and the L output voltage is close to 5 V, a logic high. When the SSR is closed, current flows through R and the output voltage is close to 0 V, a logic low. L Choo
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Level Min Max Input low voltage –60 VDC 1 VDC Input high voltage 3.2 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
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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 ......
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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. Operati
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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
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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 co
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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 measure
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