National Instruments 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.

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1 USB Cable Strain Relief

Figure 1. USB-6525 Top View

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 ni.com/ info and enter rddqld.

Hardware

The block diagram in Figure 3 shows key functional components of the

USB-6525.

	Full-Speed USBInterface	Vbus	P0	SSRs	P0.<0..7>A/B	Digital I/O TerminalBlock
			USB Microcontroller
				Current-
		USB	P1	Limiting	P1.<0..7>+/
				Isolated
				Inputs

Figure 3. USB-6525 Block Diagram

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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.

3	4
1
2
3
4

1	Overlay Label with Pin Orientation Guides	3	Screw Terminal Blocks
2	Combicon Jack	4	Signal Labels

Figure 4. Signal Label Application Diagram

3.Connect the wiring to the appropriate screw terminals.

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USB-6525 User Guide and Specifications

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
	1	P0.0A
	2	P0.0B
	3	P0.1A
	4	P0.1B
	5	P0.2A
	6	P0.2B
	7	P0.3A
	8	P0.3B
	9	P0.4A
	10	P0.4B
	11	P0.5A
	12	P0.5B
	13	P0.6A
	14	P0.6B
	15	P0.7A
	16	P0.7B

Module	Terminal	Signal
	17	P1.0+
	18	P1.0–
	19	P1.1+
	20	P1.1–
	21	P1.2+
	22	P1.2–
	23	P1.3+
	24	P1.3–
	25	P1.4+
	26	P1.4–
	27	P1.5+
	28	P1.5–
	29	P1.6+
	30	P1.6–
	31	P1.7+/PFI 0+
	32	P1.7–/PFI 0–

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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 Vpk) output
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 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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USB-6525 User Guide and Specifications