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3e Technologies International 3e-250 User Manual

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Type: User Guide
Category: Adapter
Pages: 18
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3e-250

Bluetooth to 

RS

-232

Cordless Adaptor

User’s Guide

3e Technologies International
700 King Farm Blvd.
Rockville, MD 20850
(301) 670-6779 
www.3eti.com

29000107.001 

 

 

 

 

 

 

 

 

    

013003


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3e-250

Bluetooth to RS-232

Cordless Adaptor

User’s Guide

3e Technologies International

700 King Farm Blvd.
Rockville, MD 20850

(301) 670-6779 

www.3eti.com


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iii

Copyright © 2003 3e Technologies International, Inc. All rights reserved. No part of this 

documentation may be reproduced in any form or by any means or to make any derivative work 

(such as translation, transformation, or adaptation) without written permission from 3e Technologies 

International.

3e Technologies International reserves the right to revise this documentation and to make changes in 

content from time to time without obligation on the part of 3e Technologies International to provide 

notification of such revision or change.

3e Technologies International provides this documentation without warranty, term or condition 

of any kind, either implied or expressed, including, but not limited to, the implied warranties, 

terms, or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 

3e Technologies International may make improvements or changes in the product(s) and/or the 

program(s) described in this documentation at any time.

If there is any software or removable media described in this documentation, it is furnished under a 

license agreement included with the product as a separate document, in the printed documentation, 

or on the removable media in a readable file such as license.txt or the like. If you are unable to locate a 

copy of the license, contact 3e Technologies International and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States Government agency, then this documentation and the product described 

herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private 

expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-

7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with 

only such rights as are provided in 3e Technologies International’s standard commercial license for 

the software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 

(Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface 

any portion of any legend provided on any licensed program or documentation contained in, or 

delivered to you in conjunction with, this User Guide.

________________________________________________

3e Technologies International and the 3e Technologies International logo are registered trademarks.

Windows is a registered trademark of Microsoft Corporation. Macintosh and Mac OS are registered 

trademarks of Apple Computer, Inc.

Any other company and product name mentioned herein are trademarks of the respective companies 

with which they are associated.

EXPORT RESTRICTIONS

This 3e Technologies International product contains encryption and may require U.S. and/or local 

government authorization prior to export to another country.  


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iii

Table of Contents

Introduction ......................................................................................................................1
Installation 
........................................................................................................................1
Initial Setup.......................................................................................................................2
Operation and Maintenance ..........................................................................................6

Transferring data from PC to PC .............................................................................6

Connecting to a Test Instrument..............................................................................7

Using the LEDs...........................................................................................................7

Maintaining Battery Life...........................................................................................8

Configuration Commands for the 3e-250 Adapter ...............................................8

Troubleshooting .............................................................................................................10

Manufacturer’s Statement ......................................................................................10

Advices and Warnings ............................................................................................10

REGULATORY COMPLIANCE..................................................................................11

FCC Part 15 Declaration of Conformity (DoC)....................................................11

FCC Radiation Exposure Statement......................................................................11


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1

Introduction

The 3e-250 Bluetooth to RS-232 Cordless Adapter is a Plug and Play 

adapter that allows you to use your RS-232 (serial) port to communicate 

wirelessly between multiple pieces of equipment. 

In itself, the 3e-250 requires no installation of software or drivers on 

the host machine. It doesn't initiate communications, but simply acts as a 

substitute for a wired serial connection. As such, it allows direct commu-

nication between equipment such as data recorders, computers, handheld 

devices, test electronics equipment, measurement devices and the like.

It enables users to connect measurement devices wirelessly to a cen-

tral analysis and recording area, eliminating the need to download infor-

mation from an unconnected measurement device.

The adapter incorporates a Bluetooth solution containing a BT 1.1 

compliant transceiver operating in the 2.4 GHz range using frequency-

hopping at 1600 times/sec among the available frequency ranges.

The operating range of the 3e-250 is up to 30m or 100 feet. It provides 

link control functionality and supports operation within a Bluetooth 

piconet in a slave mode. It supports all Bluetooth data rates of up to 723 

Kbits/sec.

Installation

The 3e-250 Cordless Adapter comes preconfigured with certain basic 

parameters. No setup is required unless you wish to change these presets.

The pre-configured parameters are:

•  Device Name

 

The default name is 3ETI Serial Device. This name will be pre-

sented to other devices which are trying to connect to it. (You 

might want to change this name if you are going to use a number 

of these Adapters.)

•  RS-232 baud rate

 

The default baud rate is 9600, 8-N-1. (You might need to change 

this default setup depending on the device that you will be attach-

ing it to.)

If any change to the configuration is required, or you plan to imple-


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3e-250 Bluetooth to RS-232 Cordless Adapter

3

User's Guide

ment more than a direct RS-232 cable replacement function,  you will 

need to install at least one remote Bluetooth master device on a PC. 

The Bluetooth master, such as the 3e-240 Bluetooth USB Dongle, in-

stalls on a USB port on your laptop and comes with software that allows 

you to manage up to 7 slaves. Some examples of possible configurations 

are shown below.

Initial Setup

If some setup is required or you want to ensure the Adapter is work-

ing, move the power switch to the "on" position and attach the DB9 serial  

port to a serial port on your computer.

To verify that the device is working, open a "Hyper Terminal" applica-

tion on your computer. You will usually find this application by following 

the path, Start àPrograms à Accessories à Communications.

With your 3e-250 Adapter on and attached to your COM port, the 

Hyper Terminal window should prompt you to connect to, for instance, 

Com 2 (if that is where your device is plugged in) as shown in the follow-

ing picture.

DB9 connector

Off

On


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3e-250 Bluetooth to RS-232 Cordless Adapter

3

User's Guide

The New Connection wizard will ask you to name your session and 

give you a choice of icons to associate with it. You can call it anything that 

will readily identify it for you. We chose "port1."

Click OK to begin the Hyper Terminal session.

You will next see a "connect to" screen. Select the COM port to which 

the 3e-250 is connected and click OK.

Set the "connect using" dropdown menu to the COM port you are us-

ing on your computer. This is usually COM1 or COM2.

Click OK to go to the COM2 Properties screen.


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3e-250 Bluetooth to RS-232 Cordless Adapter

5

User's Guide

Initially, set the properties to 9600 8-N-1 with flow control at Hard-

ware

If you will be using the 3e-250 Adapter with test equipment and you 

know that it requires a different baud rate than 9600, you can change that 

later, using the Hyper Terminal session. Normally, the only things that 

you will need to change are the baud rate and the device name.

Click OK to save your settings and select Properties from the File 

dropdown  menu.

In the Properties window, select the Settings tab. In the Backspace 

Key Sends

 section, select the "Ctrl+H, Space, Ctrl+H" radio button. And 

click on the ASCII Setup button.

In the ASCII Setup window, make sure you check the selection for 

"Send line end with line feeds" and "Echo typed characters locally." 

Checking these options will provide feedback when you issue commands 

in hyperterminal.  (This is very useful as a means of checking that your 

command has been accepted.

Important Note: If you are working in Windows XP, and your hyper-

terminal software will not access the Bluetooth device, you may have to 

set the MODE switches to the ON position for both DSR and CTS.


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3e-250 Bluetooth to RS-232 Cordless Adapter

5

User's Guide

Then click OK and OK to close the Properties menu and return to the 

main Hyper Terminal screen. 

In the Hyper Terminal window, you can now type the command
 

 

 

 

help

 

 

 

 

 

and when you press the Enter key 

on your computer, you will get a list of the commands available to the 3e-

250 device in the Hyperterminal session.

You may want to save the Hyperterminal setup on your desktop so 

that you can use it to set up a number of the Adapters.


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3e-250 Bluetooth to RS-232 Cordless Adapter

7

User's Guide

To save it, go to FileàSave and save to the Desktop. You will see an 

icon similar to the following on your desktop.

After a Hyper Terminal session, you may also see two 

other icons on your Desktop. These two files, which should 

look similar to the two shown to the right, can be dropped in 

the Recycle Bin.

Operation and Maintenance

Transferring data from PC to PC

The 3e-250 Bluetooth to RS-232 Cordless Adapter can be used, with 

another Bluetooth device, installed on another computer, to transfer data 

between the two machines. The other Bluetooth adapter can be the 3e-240 

Bluetooth Dongle or any Bluetooth-certified RS-232, USB, or PCMCIA 

product. Refer to the manual that came with the other Bluetooth device 

for instructions on its installation and operation.

Once the other device is installed, let it discover all available devices.
(NOTE: If there is more than one Bluetooth device for it to discover, 

you may want to use your Hyper Terminal session to rename your 3e-250 

Adapter, using the devicename command. See the table of commands on 

page 9 for more information.)

Select the 3e-250 Adapter from the list of discovered devices by its 

name and double-click it to initiate the process of connecting to the 

Adapter. The Adapter provides the service "serial port."

Double-click on the "serial port" service icon and the local device 

will connect to the Adapter and set up the serial port service, using a lo-

cal COM port for the connection. Make a note of the COM port number 

selected and open a Hyper Terminal session. Connect to the virtual COM 

port you have just set up, using the procedure detailed in the section 

Initial Setup. 

You can set the baud rate for this COM port to any value up 

to 115200.


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3e-250 Bluetooth to RS-232 Cordless Adapter

7

User's Guide

At this point, you have completed the communication setup between 

the 3e-250 Adapter and the other Bluetooth device.

To verify the connection, type some characters in the Hyper Terminal 

window on one of the computers. The same characters should be visible 

in the Hyper Terminal window on the other computer. Whole files can be 

transferred using the Transfer à Send File option in the Hyper Terminal 

window.

Connecting to a Test Instrument

Connecting to a test instrument can be a bit more complex than con-

necting from PC to PC, because you will need to know the RS-232 signals 

supported by the particular instrument. Each test instrument has its own 

mechanism which that instrument uses for hardware flow control (RTS/

CTS and DTR/DSR). 

Before installing the 3e-250 Adapter on a test device, research the 

required settings for that test device in its documentation. 

The 3e-250 Adapter has two dipswitch settings accessible on the back 

(bottom) of the device.

The dipswitches allow you to configure for the particular device. 

The DTR/DSR switch is set to the ON position by default. The RTS/CTS 

switch is set OFF by default.

Once you have configured the dipswitches, connect the 3e-250 to 

the DB9 connector on the test instrument. If there is not enough space to 

directly connect to the DB9 connector, use a 9-pin straight cable with a 

male connector at one end and a female connector at the other. (This is not 

included in the install kit.)

You can now communicate to the 3e-250 from the Bluetooth device on 

the host PC.

Using the LEDs

There are three LEDs on the 3e-250. 

•  Bluetooth Link Activity Indicator

•  Battery Status Indicator

•  Battery Charging Indicator


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3e-250 Bluetooth to RS-232 Cordless Adapter

9

User's Guide

3e-250 LED Description Table

LED

Activity

Description

Bluetooth Link Activity 

Indicator

Flashing Green
No light

Indicates link activity
Indicates OFF

Battery Status Indicator

Green
Orange
Red

Battery is 75-100% charged
Battery is 25-75% charged
Battery charge less than 

25%

Battery Charging Indicator

Red

No light

Charging from external 

power source
No external hookup or fully 

charged

Bluetooth Link Actrivity

Battery Status Indicator

Battery Charging Indicator

External Power Connector

The following chart gives the variables for the indicator lights.

Maintaining Battery Life

You can recharge the internal rechargeable batteries at any point. If 

the Battery Status Indicator turns red, you should recharge at your earli-

est convenience. Plug in the 120V AC / 9V DC power adapter shipped 

with the 3e-250 and charge fully (may require up to 3 hours). Recharging 

should be done in conditions of less than 113 ° F (45 ° C) to ensure proper 

charge.

There is an RS-232 Trickle-Charge on-off switch on the back of the 

3e-250 which is provided as a discretionary battery power conserva-

tion device. The default position is OFF. And this switch should be left 

in the off position if you are running the device connected to any piece 

of test equipment that runs on battery power, as it will "steal" the power 

from the parent device in order to "trickle-charge" the 3e-250 battery. 

However, if you are running the 3e-250 on a host device that can spare 

power, you can conserve battery power extensively by setting the RS-

232 Trickle-power switch to on. When the 3e-250 is charging from an AC 

power outlet, the switch can be either on or off. It does not matter.  See the 

picture of the back of the device on the preceding page for the location of 

the Trickle-Charge switch. Move the switch with a small point object like 

a paper clip or pen point.  


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3e-250 Bluetooth to RS-232 Cordless Adapter

9

User's Guide

Configuration Commands for the 3e-250 Bluetooth RS-232 Adapter

Command

Description

  help

•  lists all the supported commands

  version

•  displays the version of the software running on the device

  config

•  places the device in configuration mode. In this mode the Bluetooth 
    Radio function is inactive; no remote device can connect to it.
•  the device will not be able to go into deep sleep in this mode
•  syntax for this mode is "config <start|end>". The "start" argument 
    places the device in configuration mode and the "end" command 
    exits the configuration mode.
•  arguments for this command are not optional. An error message is 
    echoed to the host when no arguments are supplied with the command.

  devicename

•  allows user to change default name (up to 50 characters).
•  default device name is "3ETI Serial Device."
•  command syntax is "devicename [new name for device]".
•  arguments are optional. Using devicename without argument simply 
    displays current name.
•  if new devicename is set, it will be echoed back to the host.

  changebaud

•  allows change to baud rate. (Default baud rate is 9600; maximum 
    baud rate is 115200).
•  command syntax is "changebaud <baud rate>".
•  arguments are not optional. Failure to supply argument causes an 
    error message to echo back to the host. An example of correct use 
    would be: "changebaud 115200". Baud rate will change to 115200    
    bits/sec.
•  once baud rate is changed, the host application will have to change 
    its baud rate and reset the device to effect the baud rate change.

  deviceaddress •  displays the 48bit Bluetooth device address for the device.

•  no arguments are used with the command.

  changepin

•  allows user to change the default PIN "3eti" to set authentication and 
    encryption between two Bluetooth devices. Usage of this PIN is 
    optional and will be executed only if the remote device requests 
    authentication and encryption of all communications on the link.
•  command syntax is "changepin <user pin>". The use of the argument is 
    not optional. PIN name can be from 4 to 16 alphanumeric characters.


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3e-250 Bluetooth to RS-232 Cordless Adapter

11

User's Guide

Configuration Commands for the 3e-250 Adapter

There are some configuration commands that can be useful in chang-

ing or adapting configuration settings on the 3e-250 Adapter. You can 

access these commands by plugging the 3e-250 into a laptop and opening 

a Hyper Terminal window (as described in the Setup section). 

NOTE

: The Adapter will only interpret these commands when there 

is no Bluetooth connection between it and a remote Bluetooth device. 

The chart on the following page contains a description of the currently 

available commands. You can also access these commands by typing help 

in the Hyper Terminal window.

Troubleshooting

Manufacturer’s Statement

The 3e-250 Bluetooth to RS-232 Cordless Adapter is provided with 

warranty. It is not desired or expected that the user open the device. If 

malfunction is experienced and all external causes are eliminated, the 

user should return the unit to the manufacturer for service and replace it 

with a functioning unit. If you are experiencing trouble with this unit, the 

point of contact is:

support@3eti.com

or visit our website at

www.3eti.com

Advices and Warnings

Opening the case of the 3e-250 Adapter voids the warranty.

The internal batteries must be in place for the Adapter to work, even 

in AC Power mode.

Return the device to the manufacturer for service.


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3e-250 Bluetooth to RS-232 Cordless Adapter

11

User's Guide

REGULATORY COMPLIANCE

FCC Part 15 Declaration of Conformity (DoC)

This device complies with part 15 of the FCC Rules. Operation is sub-

ject to the following two conditions: (1) This device may not cause harm-

ful interference, and (2) this device must accept any interference received, 

including interference that may cause undesired operation. 

Warning: 

This device has been tested and found to comply with 

the limits for a Class B digital device pursuant to Part 15 of the Federal 

Communications Commissions Rules and Regulations. These limits are 

designed to provide reasonable protection against harmful interference 

when the equipment is operated in a commercial environment. This 

equipment generates, uses, and can radiate radio frequency energy and, 

if not installed and used in accordance with the instruction manual, may 

cause harmful interference to radio communications. However, there is no 

guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or televi-

sion reception, which can be determined by turning the equipment off 

and on, the user is encouraged to try and correct the interference by one 

or more of the following measures:

• 

Relocate this device

• 

Increase the separation between the device and the receiver

• 

Connect the device into an outlet on a circuit different from that of 

other electronics

• 

Consult the dealer or an experienced radio technician for help.

FCC Radiation Exposure Statement

Important Note: To comply with FCC RF exposure compliance re-

quirement, the antenna used for this transmitter must be installed to pro-

vide a separation distance of at least 20cm from all persons and must not 

be co-located or operating in conjunction with any other transmitter.

This transmitter must not be co-located or operating in conjunction 

with any other antenna or transmitter.

Caution: 

Changes or modifications not expressly approved by 3e 

Technologies International could void the user’s authority to operate the 

equipment.


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3e-250 Bluetooth to RS-232 Cordless Adapter