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US Digital

USB4 Encoder Data Acquisition USB Device

This product has been succeeded by the USB4 Encoder Data Acquisition USB Device.

This next generation product is highly recommended for all new designs and applications. Learn more »

USB1 Encoder Data Acquisition USB Device

Overview

  • Real-time tracking of up to four incremental encoders and 8 digital inputs
  • History buffer has programmable sample frequency from once per day to 1 kHz
  • DIN rail mounting is available
  • 8 relay driver outputs
  • 8 bit parallel input port accepts either relay closure, TTL input or high voltage input up to 30V
  • LEDs show status of each encoder and bus activity
  • Available with single-ended or differential encoder inputs
  • Includes serial encoder interface (SEI) port for reading USD's absolute encoders
  • Easy to use Windows drivers and demo software
  • Low latency input capture mode: stores position within 25 usec of digital trigger input

Product Specifications

Parameter Min Typ Max Units Notes
Supply input voltage 8 12 16 V Compatible with US Digital PS-12 power supply
Supply input current   50   mA At 12 V with no encoders or I/O connected
Regulated output voltage for encoders and I/O 4.8   5.2 V 0 to 350 mA output current, 25C, 8 to 16 VDC supply
Open collector sink current, sum of Out0 through Out7     720 mA Continuous, at 70 C
Open collector sink current, any single output     450 mA Continuous, at 70 C
Open collector saturation voltage   0.5   V Any single output, 100 mA sink current, 25 C
Open collector reverse current     500 mA Continuous, at 25 C
TTL input port high level input voltage (Vih) 2.0   30 V In0 through In7 are diode clamped to +5 V internal supply through a 10 kΩ resistor
TTL input port low level input voltage (Vil) -0.5   0.8 V In0 through In7 are diode clamped to ground through a 10 kΩ resistor
TTL input port high level input current   10   μA  
TTL input port low level input current   -500   μA In0-In7 have 10 kΩ pull-up resistors to +5 V internal supply
Encoder input high level input voltage 2.0     V Compatible with 5 V TTL optical encoders.  See note 2.
Encoder input low level input voltage (Vil)     0.8 V Compatible with 5 V TTL optical encoders.  See note 2.
Encoder input, differential model, common mode voltage -7   7 V See note 3.
 Encoder input, differential model, high level input current    0   mA  When driven by the TI 26C31 driver used in US Digital cable drivers
 Encoder input, differential model, low level input current   2.7    mA  When driven by the TI 26C31 driver used in US Digital cable drivers
Encoder input, single-ended model, high level input current     -0.2   mA When driven by HEDS or EM1 optical encoder module
 Encoder input, single-ended model, low level input current   2.7    mA  When driven by HEDS or EM1 optical encoder module 
 Quadrature cycle input frequency 0   1.5 MHz Maximum spec. requires software command to set. Default as shipped is 100 kHz
SEI port high level output voltage differential   4.75   V  
SEI port low level output voltage differential   0.1   V  
SEI port baud rates supported 2400   57.6k baud Default is 9600 baud
SEI port common-mode input voltage -7.0   12 V  

Notes:

  1. The parallel output port is actually a MOSFET driver connected in an open-drain configuration; specifications have been translated and given in the more familiar open collector nomenclature.  Note that setting a bit to 1 turns on a transistor to sink current to ground, and vice versa.
  2. Single-ended input model has encoder inputs that are terminated with 2.35 kΩ pull-up to +5 V, with a diode through 51 Ω to ground.
  3. Differential input model has encoder inputs that terminated with a 150 Ω resistor in series with 4.7 nF capacitor between each differential input pair.
Pin 5-pin 10-in
1 Ground Ground
2 Index Ground
3 A channel Index-
4 +5VDC power Index+
5 B channel A- channel
6   A+ channel
7   +5VDC power
8   +5VDC power
9   B- channel
10   B+ channel

ParameterMin.Max.Units
Storage Temperature -40 100 C
Operating Temperature 0 70 C
Humidity (non-condensing) 0 95 %
Supply Voltage 8 16 V

Features USB1 USB4
8-bit output port with high current drive yes yes
8-bit input port (24V input compatible) yes yes
Real-time tracking of up to 4 incremental encoders yes yes
Multiple triggering modes yes yes
USB version 1.0 2.0 and 1.0
Sample FIFO Buffer for data logging 4.6K 800K
Time stamp update rate 10 kHz 48 MHz
Power Supply 8V to 16V 8V to 25V
4 channel 12-bit A/D converter no yes
4 channel 12-bit D/A converter no yes
Emergency stop input no yes
Pulse duration/frequency measurement on up to 4 channels no yes
A2 Absolute Encoder Interface SEI port no*
.ocx interrupt yes no*
     
* Contact customer support for alternative solutions    

Product Description

The USB1 is a data acquisition device designed to track up to 4 incremental encoders and 8 digital inputs. Each of the 4 external encoders has a dedicated 24-bit real-time hardware up / down counter. The internal microcontroller then reads and stores the value of all four counters, the 8 digital inputs, and a 32-bit time stamp at a rate configured by the user. This historical buffer can be downloaded to the PC using the USB interface at any convenient time, even while continuing to store more samples in the internal circular buffer. The USB1 also includes the capability to use either encoder position changes or combinations of digital inputs as triggering and / or storage qualification events.

Eight relay driver type digital outputs are provided along with an SEI port that can read up to 15 US Digital absolute encoders per device. When a "1" is written a digital output port bit, the driver is asserted and the corresponding port pin is clamped to ground by a MOSFET transistor (it is an inverting 'open-collector' configuration). The USB1 takes advantage of the robustness, speed, and easy configurability of the Universal Serial Bus architecture while providing a simple and consistent software interface for the encoders and inputs that it tracks. The USB1 is intended for use with computers that have at least one free USB port and are running the Windows 98/ME/2000/XP operating systems. The USB1 is fully compatible with USB expansion hubs, allowing multiple USB1 units to be used on a single computer.

The USB1 is powered by a standard US Digital regulated DC power supply (PS-12). The USB1 provides 5VDC power to the encoders and digital I / O connectors. The USB1 may be instructed to retain configuration settings (but not count values) when power is removed. If power is lost, the incremental counters reset to zero.

The USB1 supports both indexed and non-indexed encoders in x1, x2 or x4 counting modes. Its four independent counters are able to respond to quadrature frequency rates of up to 1 MHz, with a counting range from 0 to 16,777,215. The USB1 command protocol provides access to a control register for each channel, allowing individually programmable count modes of Normal Count, Modulo-N, Non-recycle, and Range Limit for each channel. The USB1 may be configured in software to zero a channels counter when an encoder index signal is asserted.

The SEI port on the USB1 is designed for US Digital's SEI based products, such as the A2 absolute encoder. The baud rate of the SEI port is fully programmable, and supports baud rates from 2400 to 57,600 bps.

Product Notes
  • Cables and connectors are not included and must be ordered separately.
  • US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
Related

Purchasing

Configure and Purchase

1. Input


2. Mounting


Product Part Number
Quantity Price
1 $368.00
10 $330.75
50 $299.25
100 $268.00
Over 100 Call for quote
Quantity
Unit Price

$368.00

Subtotal

$368.00

For your convenience, use the above part number to order via phone 800.736.0194

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