Measurement Computing BTH-1208LS-OEM Manuale utente

BTH-1208LS-OEM

Wireless Multifunction DAQ Device

Document Revision 5A

December 2014

User's Guide

HM BTH-1208LS-OEM

Trademark and Copyright Information

Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are

either trademarks or registered trademarks of MeasurementComputing Corporation. Refer to the Copyrights &

Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.

Other product and company namesmentioned herein are trademarks or trade names of their respective

companies.

reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic,mechanical, by

photocopying, recording, or otherwise without the prior written permission of Measurement Computing

Corporation.

Notice

Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for

use in life support systems and/or devices without prior written consent from Measurement Computing

Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation

into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in

injury. Measurement Computing Corporation products are not designed with the components required, and are

not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of

people.

Table of Contents

Preface

About this User's Guide .......................................................................................................................5

What you will learn from this user's guide .........................................................................................................5

Conventions in this user's guide .........................................................................................................................5

Where to find more information.........................................................................................................................5

Chapter 1

Introducing the BTH-1208LS-OEM ......................................................................................................6

Functional block diagram...................................................................................................................................7

Chapter 2

Installing a BTH-1208LS-OEM..............................................................................................................8

Unpacking...........................................................................................................................................................8

Downloading the software..................................................................................................................................8

Pairing with the host device................................................................................................................................8

Installing the hardware in USB mode (Windows only)......................................................................................9

Configuring Bluetooth settings...........................................................................................................................9

Calibrating the hardware.....................................................................................................................................9

Chapter 3

Functional Details ...............................................................................................................................10

Analog input acquisition modes .......................................................................................................................10

Software paced mode.......................................................................................................................................................10

Hardware paced mode......................................................................................................................................................10

BURSTIO........................................................................................................................................................................11

Board components............................................................................................................................................11

USB connector.................................................................................................................................................................11

Power/pairing button........................................................................................................................................................12

LEDs................................................................................................................................................................................12

Connector J1....................................................................................................................................................................13

Connector J2....................................................................................................................................................................13

Connector J3....................................................................................................................................................................13

Signal connections............................................................................................................................................14

Analog input....................................................................................................................................................................14

Analog output ..................................................................................................................................................................15

External clock input.........................................................................................................................................................15

Digital I/O........................................................................................................................................................................15

External pull-up/pull-down capability .............................................................................................................................15

Bulkhead signals..............................................................................................................................................................16

Trigger input....................................................................................................................................................................16

Counter input...................................................................................................................................................................16

Ground.............................................................................................................................................................................17

Power output....................................................................................................................................................................17

Mechanical drawing .........................................................................................................................................17

Chapter 4

Specifications......................................................................................................................................18

Analog input.....................................................................................................................................................18

Accuracy..........................................................................................................................................................................19

Noise performance...........................................................................................................................................................20

Analog output...................................................................................................................................................20

Digital input/output...........................................................................................................................................21

External trigger.................................................................................................................................................22

External clock input..........................................................................................................................................22

BTH-1208LS-OEM User's Guide

Counter.............................................................................................................................................................23

Memory ............................................................................................................................................................23

Microcontroller.................................................................................................................................................23

Power................................................................................................................................................................24

Bluetooth ..........................................................................................................................................................24

USB ..................................................................................................................................................................24

Environmental ..................................................................................................................................................24

Mechanical .......................................................................................................................................................25

Signal connectors..............................................................................................................................................25

Analog signals (J1) ..........................................................................................................................................................25

Digital signals (J2)...........................................................................................................................................................25

Bulkhead signals (J3).......................................................................................................................................................26

Preface

About this User's Guide

What you will learn from this user's guide

This user's guide describes the Measurement Computing BTH-1208LS-OEM wireless data acquisition device

and lists device specifications.

Conventions in this user's guide

For more information

Text presented in a box signifies additional information and helpful hints related to the subject matter you are

reading.

Caution! Shaded caution statements present information to help you avoid injuring yourself and others,

damaging your hardware, or losing your data.

bold text Bold text is used for the names of objects on a screen, such as buttons, text boxes, and check boxes.

italic text Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.

Where to find more information

Additional information about the BTH-1208LS-OEM is available on our website at www.mccdaq.com. You can

also contact Measurement Computing Corporation with specific questions.

Knowledgebase: kb.mccdaq.com

Tech support form: www.mccdaq.com/support/support_form.aspx

Email: techsupport@mccdaq.com

Phone: 508-946-5100 and follow the instructions for reaching Tech Support

For international customers, contact your local distributor. Refer to the International Distributors section on our

website at www.mccdaq.com/International.

Chapter 1

Introducing the BTH-1208LS-OEM

The BTH-1208LS-OEM is a multifunction data acquisition device that communicates using Bluetooth®

wireless technology.

The Bluetooth radio host used with the device must support Bluetooth 2.0 or later. The following Bluetooth

stack protocols are supported on Windows:

Microsoft Bluetooth stack

Broadcom ® Bluetooth stack (not supported by Windows XP)

The device supports USB 2.0 full-speed when connected to a USB port. The device is also compatible with

USB 1.1 ports; however, the speed of the device may be limited when using a USB 1.1 port due to the

difference in transfer rates on USB 1.1 versions of the protocol (low-speed and full-speed).

The BTH-1208LS-OEM provides the following features:

Eight 11-bit single-ended (SE) or four 12-bit differential (DIFF) analog input channels

1 kS/s max sample rate in Bluetooth continuous scan mode

47 kS/s sample rate in Bluetooth BURSTIO mode and when communicating over USB connection

Software-selectable analog input ranges of ±10 V (SE), and ±20 V, ±10 V, ±5 V, ±4 V, ±2.5 V, ±2.0 V,

±1.25 V, and ±1.0 V (DIFF).

Two 12-bit analog outputs

Eight individually-configurable digital I/O channels

One 32-bit event counter

One external digital trigger input

One external clock input

Three header connectors for field wiring

Header connectors available for user-supplied power; can also be powered by a USB power supply in

Bluetooth mode or from the USB host device in USB mode. Connectors for battery power and battery

charging are also included.

Caution! There are no product safety, electromagnetic compatibility (EMC), or CE marking compliance

claims made for the BTH-1208LS-OEM. The BTH-1208LS-OEM is intended for use as a

component of a larger system. MCC can help developers meet their compliance requirements. The

end product supplier, however, is responsible for conforming to any and all compliance

requirements.

BTH-1208LS-OEM User's Guide Introducing the BTH-1208LS-OEM

Functional block diagram

BTH-1208LS-OEM functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

Microcontroller

Analog Input

8 Single-Ended Channels (11-bit)

4 Differential Channels (12-bit)

Analog Output

2 Channels

Bluetooth

Module

USB

Power Supplies

with Shutdown and Soft-Start

Charger

Control

3.3 V

1.8 V

5.5 V

Digital I/O

Trigger Input

Event Counter

1 Channel

(32-bit)

Clock Input

Chapter 2

Installing a BTH-1208LS-OEM

Unpacking

As with any electronic device, you should take care while handling to avoid damage from static

electricity. Before removing the board from its packaging, ground yourself using a wrist strap or by simply

touching the computer chassis or other grounded object to eliminate any stored static charge.

Downloading the software

Refer to the BTH-1208LS-OEM product page on the Measurement Computing website for information about

the supported software you can download.

For instructions on deploying and running apps in an Android environment, refer to the UL for Android

Example Projects topic in the Universal Library for Android Help that installs with the UL for Android

software library.

Install the software before you install the hardware

The driver needed to run the device is installed when you install the software. Therefore, you need to install the

software package you plan to use before you install the hardware.

Pairing with the host device

Pairing creates a bond between a Bluetooth device and a host device. A host device can be either a Windows-

based computer or an Android device (tablet, phone, or mini-PC).

The BTH-1208LS-OEM must be paired with the host device before it can establish a wireless connection and

transmit acquired data to the device. A BTH-1208LS-OEM only has to be paired once with a particular host

device.

The BTH-1208LS-OEM can be paired or connected when powered by:

batteries (standard or rechargeable)

an external USB power supply

The BTH-1208LS-OEM cannot be paired when powered by a USB host device.

To pair the BTH-1208LS-OEM as a Bluetooth device, make sure the device is not connected to a USB host, and

complete the following steps (refer to Figure 2 on page 11 for the location of device components referenced in

this section):

1. Make sure the host device is configured to host a Bluetooth device. Refer to host device documentation to

learn how to enable Bluetooth and how to search for and pair with Bluetooth devices.

2. If powered by batteries, press and hold the button for at least five seconds to power on the device and put it

into pairing mode.

If powered by a USB power supply, press and hold the button for at least three seconds to put the device

into pairing mode.

When the Power and Status LEDs blink alternately, the device is in pairing mode and is ready to pair with

the host device.

3. Select the Bluetooth device setup in the host device OS software, and then select the BTH-1208LS-OEM

when it displays. Refer to the Bluetooth documentation of your host device to learn how to pair it with a

Bluetooth device.

For example, in Windows, select Bluetooth Devicefrom the Control Panel, and then double-click on

BTH-1208LS-OEM-xxxx in the Add a device dialog box (xxxx are the last four digits of the device serial

number. You may need to wait a few seconds for the device to display.

4. If host device requests a passkey, PIN or pairing code, enter the default value for the device (0000).

BTH-1208LS-OEM User's Guide Installing a BTH-1208LS-OEM

5. Press and hold the power/pairing button for two seconds to remove the device from pairing mode.

Once the BTH-1208LS-OEM is paired to the host device, run an application that communicates with the device

(such as InstaCal or a UL for Android example program) to establish a connection. The Status LED turns on to

indicate a Bluetooth connection is established.

Digital ground to earth ground connection recommended

Measurement Computing recommends that you connect one of the digital grounds (GND) to earth ground to

reduce the chance of the BTH-1208LS-OEM unexpectedly powering down due to electrostatic discharge.

Installing the hardware in USB mode (Windows only)

The driver needed to run the BTH-1208LS-OEM device is installed when you install the software. Therefore,

you need to install the software package you plan to use before you install the hardware. For operation on a

Windows operating system, Measurement Computing recommends that you run Windows Update to update

your operating system with the latest USB drivers.

Connect the USB cable to an available USB port on the computer or to an external USB hub connected to the

computer. Connect the other end of the USB cable to the USB connector on the device. No external power is

required.

Configuring Bluetooth settings

All Bluetooth settings except for the pairing code can be changed when the BTH-1208LS-OEM is either

physically or wirelessly connected to the host device. The pairing code can only be changed when the BTH-

1208LS-OEM is physically connected to the host device.

You can configure the following Bluetooth settings on the BTH-1208LS-OEM through software. For example,

if you are using the device in a Windows environment, you can configure these settings with InstaCal.

Pairing code – Four digit code that identifies the BTH-1208LS-OEM to the host device (default = 0000).

The pairing code cannot be changed when the BTH-1208LS-OEM is connected wirelessly to the host

device.

Bluetooth connection status notifications – You can set values that indicate when the device is

connected over Bluetooth, and when the Bluetooth connection terminates. Connected and disconnected

values can be set for digital outputs, analog output channel 0, and analog input channel 1

Auto shutdown – When the device is powered by batteries, you can configure the device to power down a

specified amount of time after the Bluetooth connection terminates.

Battery charging – When the device is powered by rechargeable batteries, you can configure the device to

recharge batteries from the USB power supply when connected over Bluetooth.

Calibrating the hardware

The Measurement Computing Manufacturing Test department performs the initial factory calibration. Return

the device to Measurement Computing Corporation when calibration is required. The recommended calibration

interval is one year.

Field calibration is not supported.

Chapter 3

Functional Details

Analog input acquisition modes

The BTH-1208LS-OEM can acquire analog input data in three different modes – software paced, hardware

paced, and BURSTIO.

Software paced mode

In software paced mode you can acquire one analog sample at a time. You initiate the A/D conversion by

calling a software command. The analog value is converted to digital and returned to the computer. You repeat

this procedure until you have the total number of samples that you want from one channel.

When communicating over a Bluetooth connection, the typical throughput sample rate in software paced

mode is 10 S/s (system-dependent).

When communicating over a USB connection, the typical throughput sample rate in software paced mode

is 250 S/s (system-dependent).

Hardware paced mode

In hardware paced mode you can acquire data from up to eight channels. The analog data is acquired and

converted to digital values until you stop the scan.

When communicating over a Bluetooth connection, the maximum sample rate of 1024 S/s is an aggregate

rate. The total acquisition rate for all channels cannot exceed 1024 S/s. The following table lists the sample

rates when scanning from one to eight channels in Bluetooth mode.

Maximum per channel sample rate in Bluetooth mode

# channels scanned Sample rate (S/s)

1 1024

2 512

3 341.33

4 256

5 204.8

6 170.67

7 146.28

8 128

When communicating over a USB connection, the maximum sample rate of 47 kS/s is an aggregate rate.

The total acquisition rate for all channels cannot exceed 47 kS/s. Data is transferred in blocks of 32 samples

from the device to the memory buffer on your computer.

The following table lists the sample rates when scanning from one to eight channels in USB mode.

Maximum per channel sample rate in USB mode

# channels scanned Sample rate (kS/s)

1 47

2 23.5

3 15.67

4 11.75

5 9.40

6 7.83

7 6.70

8 5.88

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