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USB-5201 User's Guide  

Sensor Connections 

17 

Digital I/O connections 

You can connect up to eight digital I/O lines to the screw terminals labeled 

DIO0

 to 

DIO7

. You can configure 

each digital bit for either input or output. All digital I/O lines are pulled up to +5 V with a 47 kΩ resistor 
(default). You can request the factory to configure the resistor for pull-down to ground if desired. 

Caution!

 

If a digital bit is set up as an alarm, the bit will be configured for output on power-up, and assume 
the state defined by the alarm configuration. 

When you configure the digital bits for input, you can use the USB-5201 digital I/O terminals to detect the state 
of any TTL-level input. Refer to the schematic shown in Figure 4. If you set the switch to the +5 V input, DIO0 
reads 

TRUE

 (1). If you move the switch to GND, DIO0 reads 

FALSE

 (0). 

+5V

+GND

DIO0

 

Figure 4. Schematic showing switch detection by digital channel DIO0 

Caution!

 

All ground pins on the USB-5201 (pins 9, 19, 28, 38) are common and are isolated from earth 
ground. If a connection is made to earth ground when using digital I/O and conductive 
thermocouples, the thermocouples are no longer isolated. In this case, thermocouples must not be 
connected to any conductive surfaces that may be referenced to earth ground 

For general information regarding digital signal connections and digital I/O techniques, refer to the 

Guide to 

Signal Connections

 (available on our web site at 

www.mccdaq.com/signals/signals.pdf

). 

Configuring the DIO channels to generate alarms 

The USB-5201 features eight independent temperature alarms. All alarm options are software configurable. 

When a digital bit is configured as an alarm, that bit is configured as an output on the next power cycle and 
assumes the state defined by the alarm configuration. 

Each alarm controls an associated digital I/O channel as an alarm output. The input to each alarm is one of the 
temperature input channels. You set up the temperature conditions to activate an alarm, and the output state of 
the channel (active high or low) when activated. When an alarm is activated, its associated DIO channel is 
driven to the output state specified. 

The alarm configurations are stored in non-volatile memory and are loaded on power up. The temperature 
alarms function both in data logging mode and while attached to the USB port on a computer. 

 

Summary of Contents for USB-5201

Page 1: ......

Page 2: ...USB 5201 USB based 8 Channel Thermocouple Input Device and Data Logger User s Guide Document Revision 7 June 2008 Copyright 2008 Measurement Computing Corporation...

Page 3: ...d with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Warranty Program Any Measurement Computing pro...

Page 4: ...from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation All rights reserved No part of this publication may be reproduced sto...

Page 5: ...12 and earlier 12 Firmware revision 3 0 and later 12 Configuring the USB 5201 13 Configuring data logging options 13 Calibrating the USB 5201 13 Chapter 3 Sensor Connections 14 Screw terminal pin out...

Page 6: ...input section 22 Channel configurations 22 Accuracy 23 Thermocouple measurement accuracy 23 Throughput rate to PC 23 Digital input output 24 Temperature alarms 24 Memory 24 Microcontroller 25 Data Lo...

Page 7: ...Insert the disk or CD and click the OK button italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase For example The InstaCal installation pr...

Page 8: ...ach alarm is software configurable as active high or low You set up the temperature threshold conditions to activate each alarm When an alarm is activated the associated DIO channel is driven to the o...

Page 9: ...Isolated DC DC USB 5V 12 12 8 DIO Compact Flash connector Battery backed Real Time Clock USB Microcontroller USB PC Ext Pwr for data logging USB or External power required for data logging operations...

Page 10: ...ored on the USB 5201 The USB 5201 is plug and play There are no jumpers to position DIP switches to set or interrupts to configure You can connect the USB 5201 before or after you install the software...

Page 11: ...t The following items are shipped with the USB 5201 Hardware The following items should be included with your shipment USB 5201 with memory card USB cable 2 meter length External power supply 2 5 watt...

Page 12: ...port on your computer or to an external USB hub that is connected to your computer The USB cable provides power and communication to the USB 5201 Caution If you are connecting the USB 5201 to an exter...

Page 13: ...ions are loaded on power up The factory default configuration is Type J thermocouple Warm up Allow the USB 5201 to warm up for 30 minutes before taking measurements This warm up time minimizes thermal...

Page 14: ...ows on the bottom edge Each row has 26 connections Between each bank of screw terminals are two integrated CJC sensors used for thermocouple measurements Signals are identified in Figure 2 RSVD 1 NC 2...

Page 15: ...9 DIO7 Digital Input output 24 DIO1 Digital Input output 50 DIO6 Digital Input output 25 DIO2 Digital Input output 51 DIO5 Digital Input output 26 DIO3 Digital Input output 52 DIO4 Digital Input outpu...

Page 16: ...ing configuration Connect the thermocouple to the USB 5201 using a differential configuration as shown in Figure 3 RSVD NC C H C L NC RSVD C H C L GND RSVD Figure 3 Typical thermocouple connection Con...

Page 17: ...ital I O and conductive thermocouples the thermocouples are no longer isolated In this case thermocouples must not be connected to any conductive surfaces that may be referenced to earth ground For ge...

Page 18: ...junction voltage from the analog input s thermocouple voltage measurement Increasing the thermocouple length If you need to increase the length of your thermocouple use the same type of thermocouple...

Page 19: ...SB cable to a USB port on your computer or to an external USB hub that is connected to your computer When connected to an active USB bus the device s USB connector provides 5 V power and communication...

Page 20: ...blinks each time data is captured Any logging mode Blinks rapidly 250 ms period and continuously The memory card is full The memory card was removed during logging Insert the memory card again to sto...

Page 21: ...the device when you remove the USB 5201 when the LED is steady green This information applies to all USB 5201 devices regardless of the firmware version installed Transferring binary data after a log...

Page 22: ...IN 60 Hz 90 dB min Common mode rejection ratio fIN 50 Hz 60 Hz 100 dB min Resolution 24 bits No missing codes 24 bits Input coupling DC Warm up time 30 minutes min Open thermocouple detect Automatical...

Page 23: ...n each side of the module The accuracy listed above assumes the screw terminals are at the same temperature as the CJC sensor Errors shown do not include inherent thermocouple error Please contact you...

Page 24: ...t be connected to any conductive surfaces that may be referenced to earth ground Temperature alarms Table 6 Temperature alarm specifications Number of alarms 8 one per digital I O line Alarm functiona...

Page 25: ...ave elapsed since power on Note Data logging is not allowed when the device is attached to an active USB bus due to processing limitations The device must be connected to the standalone power supply t...

Page 26: ...ation Measurement system to PC 500 VDC min AC Adapter Power Supply used for data logging operation Output voltage 5V 5 Output wattage 2 5 W Input voltage 100 240 VAC 50 60 Hz Input current 0 2 A Note...

Page 27: ...AWG D D USB cable length 3 meters max Environmental Table 14 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 85 C Humidity 0 to 90 non condensing Me...

Page 28: ...RSVD Reserved Do Not Use CJC sensor CJC sensor 11 RSVD Reserved Do Not Use 37 RSVD Reserved Do Not Use 12 NC 38 GND 13 C2H CH2 sensor input 39 C5L CH5 sensor input 14 C2L CH2 sensor input 40 C5H CH5 s...

Page 29: ...mpatibility EN 61326 1997 Amendment 1 1998 Emissions Group 1 Class A EN 55011 1990 CISPR 11 Radiated and Conducted emissions Immunity EN61326 Annex A IEC 61000 4 2 1995 Electrostatic Discharge immunit...

Page 30: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com...

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