Data Bridge 2

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DataBridge

This document includes information to assist in using Starman ElectricsDataBridge Wireless I/O modules. Included is information for module

selection, antenna selection, circuit board design, and example schematics.

Getting Started with DataBridge Wireless I/O Modules

2010 Starman Electricwww.starmanelectric.com

Getting Started with DataBridge v1.0

Getting Started

DataBridge is a wireless I/O

transceiver module used for point-

to-point bridging of analog, digital,

and UART data. Two modules

automatically link together bridging

both sides through a low-latency,

full-duplex wireless RF link and

function as a wireless cable.

About DataBridge Modules

Wireless TelemetryRemote Data Acquisition

Remote Control

Industrial Wireless Systems

Serial Cable Replacement

Applications

Module Selection

Antenna Selection

Design Considerations

Design Examples:

Index

Minimum Configuration

Wireless Digital and Analog I/O Bridge

Wireless On/Off Digital Switches

Wireless Potentiometer for 5.0V Analog

Wireless Monitoring of 4-20mA Signals

Wireless UART link for Microcontrollers

Wireless microcontroller link from PC Serial

Wireless Data Acquisition to PC Serial

Wireless Data Acquisition to PC USB

Microcontroller Data Acquisition and Control

Configuring NETID for Multiple Networks


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DataBridge

DataBridge modules are manufactured with five models, each available in

SMD (surface mount) and DIP (0.100 pitch) for breadboard compatibility. All

DataBridge models can be mixed and matched.

Selecting a Module

2 2010 Starman Electric

www.starmanelectric.com


Getting Started

Models

Model Power Range Antenna

SE1200A 1mW 1km Internal Ceramic

SE1200B 1mW 1km SMA Connector

SE1200C 1mW 1km U.FL Connector

SE1200D 100mW 4km SMA Connector

SE1200E 100mW 4km U.FL Connector

When choosing a model consider the required transmission range, surroundinginterference, antenna type, manufacture quantity, and package format.

Range If long range is required or your application will be used in noisyRF environments, it is recommended to get a 100mW module.

Antenna Type An internal antenna is only available for 1mW powermodules. For 100mW modules, an external antenna is needed. You can

choose from either SMA or UFL connector type. SMA connectors arerecommended for prototyping, and UFL connectors are recommended forhigh volume manufacturing.

Package For prototyping and testing, it is recommended to use the DIPpackage for use with a breadboard. For high volume or custom PCB, it isrecommended to use the SMD package, as it provides cost savings and asmaller footprint.

Considerations


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Selecting the correct antenna can be important for good reception and noise

rejection. For low power SE1200A models with integrated antenna, no

additional antenna is needed. All other models require an external antenna.

When selecting an antenna, consider the following factors:

Frequency Should be designed for 2.4Ghz, and 50 ohm impedance.

Connector For SE1200B and SE1200D models, use an SMA-male

connector. For SE1200C and SE1200E models, use a U.FL connector.

Gain/Directivity Consider selecting an antenna with some gain as it will

concentrate the wireless signal in a particular direction and reduce

interference from sources not in that direction.

For omni-directional applications (all directions) consider selecting a half-

wave antenna with 2-4dB gain. Quarter-wave types may be inefficient.

For directional applications, many antennas are available that offer

substantial gain and directivity. These antennas can improve reception

significantly, however they can be expensive. Also, be sure to check local

laws to operate within legal limits.

Radiation Pattern If available, study the radiation pattern for the

antenna, and orient the signal towards the connecting device.

Selecting an Antenna




Getting Started


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Power Requirements It is important to maintain input voltage of 2.7V to 3.6V.

High power (100mW) modules will draw about 82mA current, and low power

(1mW) modules will draw about 35mA current. Both master and slave

configurations have the same current draw.

Design Considerations:




Getting Started

Reset on Power-up To ensure proper operation on

power-up, it is recommended to add a reset circuit to

all designs using DataBridge. Adding a reset circuit isas simple as connecting a 10k pull-up resistor to the

RESET input, along with a 100nF capacitor to ground.

See circuit on the right for an example.

Configuration Settings Refer to the datasheet and the schematic examples on

the following pages for information on device configuration. As a minimum, the

following needs to be connected for proper operation: Device Power (Pin 24, 25, 26)

Master/Slave Configuration (Pin 4)

Sleep Configuration (Pin 41)

Internal Requirement (Pin 9 to Pin 13)

Circuit Board Design When designing for SE1200A-SMD modules, it is

important to keep components, traces, and ground planes at least 20cm away

from the three sides of the antenna. Refer to the datasheet for more

information on specific PCB footprint dimensions and restrictions. Footprint

and schematic libraries are available from Starman Electric on request.


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The following pages include several circuit examples for using DataBridge

Wireless I/O modules for analog, digital, and UART data acquisition and control.

Applications and Circuit Examples




Getting Started

Minimum Configuration

Wireless Digital and Analog I/O Bridge

Wireless On/Off Digital Switches

Wireless Potentiometer for 5.0V AnalogWireless Monitoring of 4-20mA Signals

Wireless UART link for Microcontrollers

Wireless microcontroller link from PC Serial

Wireless Data Acquisition to PC Serial

Wireless Data Acquisition to PC USB

Microcontroller Data Acquisition and ControlConfiguring NETID for Multiple Networks

Example 1:

Example 2:

Example 3:

Example 4:Example 5:

Example 6:

Example 7:

Example 8:

Example 9:

Example 10:Example 11:


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Notes

Power of 3.3V and ground connected for each module.

One device is configured as Master, the other as Slave.

Sleep is disabled by connecting CFG (SLEEP) to ground.

Pins 9 and 13 connected together (used internally).

Reset circuit is added to RESET pin (recommended).

Example 1: Minimum Configuration




Getting Started


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Notes


The master is used to sample data, and the slave regenerates the signals.

In this example, the basic function of DataBridge devices is illustrated through a

digital and analog wireless bridge. The link bridges the digital and analog inputs of

the master device to the slave device outputs. Inputs are sampled and repeated 200times per second, with a latency of 5mS. Devices will connect automatically upon

power-up, and a digital link indication can be obtained from output pin 32.

Example 2: Wireless Digital and Analog I/O Bridge




Getting Started


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Notes


Master Digital Inputs 1 and 2 are connected to switches.

Slave Digital Outputs 1 and 2 are connected to LEDs.

In this example, both switches connect to ground when not pressed, so both LEDs

are off. When switch 1 is pressed, LED1 lights up. When switch 2 is pressed, LED 2lights up.

When using digital inputs, keep in mind that each input has a 40kohm pull-up so it

will be high by default unless tied to ground directly, driven low by another device,

or through a 5k or less pull-down.

Example 3: Wireless On/Off Digital Switches




Getting Started


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Notes


Master Analog Input 1 is connected to a potentiometer.

Slave Analog Output 1 is connected to a voltage amplifier.

In this example, the master device senses the voltage on a potentiometer

connected to 5.0V. Since the maximum analog input range for the device is 2.4V, it isreduced through the added 10.7k resistor. The voltage is wirelessly transmitted and

regenerated at the Slave analog output 1, with a range of 0 to 2.4V. The Analog

output is then connected to a voltage amplifier that has a gain of 2.08, set by the

resistors. The amplifier consists of a basic LM324 opamp connected as a non-

inverting voltage amplifier. The final analog output varies from 0 to 5V depending on

the position of the potentiometer. Keep in mind that the opamp must be powered

by a voltage greater than 5V.

Example 4: Wireless Potentiometer for 5.0V Analog Control




Getting Started


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Notes


MAX4072 converts the 4-20mA current to a 0-2.4V voltage.

Output of MAX4072 is connected to Slave Analog Input 1.

The MAX4072 acts as a high-side current amplifier for the 4-20mA current across

the 2.4ohm resistor. The MAX4072 is set to a gain of 50 using the GSEL input. Thiscurrent is converted at a voltage of 0 to2.4V, and sampled by the slave device. The

signal is wirelessly transmitted to the master, where it is regenerated on the analog

output (DAC1). It would also be possible to read the current value through both

master and slave UART outputs by configuring the CFG(DEBUG) setting. More detail

on the CFG(DEBUG) function is documented in the following examples.

Example 5: Wireless Monitoring of 4-20mA Signals




Getting Started


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Notes


The UART link is configured at 115.2kbps baudrate.

Both devices are connected to a micro-controller.

In this example, both devices are connected to a separate micro-controller through

the UART interface. The baud rate is configured to be 115.2kbps by pulling the CFG(UART) pin to 3.3V through a pull-up resistor. CFG (debug) is connected to GND to

prevent the output of I/O status information on the UART.

When UART data is received from one micro-controller, it is transferred to the other

micro-controller at 115.2kbps. To configure a different baud rate, adjust the voltage

on CFG(UART) using a resistor voltage divider. See the datasheet for more

information on the proper voltage settings.

Example 6: Wireless UART link for Microcontrollers




Getting Started


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Notes


Master device connects to PC using MAX3232 translator.

The UART is configured at 115.2kbps baud rate.

In this example, the PC can communicate wirelessly with the slave device which

connects to a micro-controller. The master device is connected to a PC Serialinterface through a MAX3232 logic level translator, and relays all Serial COM

information to the slave device. The baud rate is configured to be 115.2kbps by

pulling the CFG (UART) pin to 3.3V through a pull-up resistor. CFG (debug) is

connected to GND to prevent the output of I/O status information on the UART. To

configure a different baud rate, adjust the voltage on CFG(UART) using a resistor

voltage divider. See the datasheet for more information on the proper voltage

settings.

Example 7: Wireless microcontroller link from PC Serial COM Port




Getting Started


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Notes One device is configured as Master, the other as Slave.

Master device connects to PC using MAX232 translator.


CFG (debug) is connected to 3.3V to output of I/O status information on the UART.

In this example, the devices are connected for wireless data acquisition from theslave device , and data is outputted to the PC Serial Port. The slave device samplesthe information from the digital and analog inputs, and wirelessly transfers the datato the master device. The master device then outputs the slave I/O information tothe UART. The MAX3232 chip translates the logic levels from the UART, and outputthe data to the PC through the Serial COM interface. The baud rate is configured tobe 115.2kbps by pulling the CFG (UART) pin to 3.3V through a pull-up resistor. Inorder to output I/O status information to the UART, the CFG(debug) input isconnected to 3.3V. See datasheet for the data format to the I/O status information.

Example 8: Wireless Data Acquisition to PC Serial COM Port




Getting Started


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Notes One device is configured as Master, the other as Slave.

Master device connects to PC using FTDI TTL-232R-3V3 cable.


CFG (debug) is connected to 3.3V to output of I/O status information on the UART.

In this example, the devices are connected for wireless data acquisition from theslave device, and data is outputted to the PC USB Port. The slave device samples theinformation from the digital and analog inputs, and wirelessly transfers the data tothe master device. The master device then outputs the slave I/O information to theUART. The FTDI TTL-232R-3V3 cable translates the logic levels from the UART andtransfers the data to the PC through the USB interface. The baud rate is configuredto be 115.2kbps by pulling the CFG (UART) pin to 3.3V through a pull-up resistor. Inorder to output I/O status information to the UART, the CFG(debug) input isconnected to 3.3V. See datasheet for the data format to the I/O status information.

Example 9: Wireless Data Acquisition to PC USB Port




Getting Started


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Notes


Master device connects to micro-controller for control and data acquisition.

Master link output connects to micro-controller.

In this example, the master device connects to a micro-controller for data

acquisition and control of the slave device. Both analog inputs are sampled at the

slave device and transferred wirelessly to the master microcontroller. Firmware can

be written for the micro-controller to process the data, and then control outputs to

the slave device. In this example two digital inputs are connected to the micro-controller for control. The micro-controller can also see the state of the wireless

connection from the LINK output. For the Slave device, CFG(SLEEP) is connected to

3.3V so that if communication is lost the slave device goes to sleep to preserve

power. If desired, the master device can also be put to sleep by bringing CFG(SLEEP)

high. See the datasheet for more information on sleep functions for master and

slave devices.

Example 10: Microcontroller Acquisition/Control with Link Indication




Getting Started


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Network Configuration

Up to 16 device pairs can operate in the same area by

selecting a unique Network ID. The network ID is

determined through a 4-bit binary input with 16

unique possible combinations.

The 4-bit network ID is configured through the four

CFG(NET ID) inputs pins 33, 34, 35, and 36. Both

master and slave devices must have the same

Network ID configuration for communication to

occur.

The CFG(NET ID) inputs are connected to 40kohm

pull-ups connected to 3.3V. Connecting all four NET ID

pins to 3.3V is equivalent to leaving them floating.

The two figures at the top illustrate equivalent

Network ID configurations, due to internal pull-ups.

The two figures on the right are examples of two

unique networks configurations.

Example 11: Configuring Network ID for Multiple Network Pairs




Getting Started

(Default) (Equivalent)

(Network 1)

(Network 2)

(Slave)(Master)

(Slave)(Master)


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This equipment has been tested and found to comply with the limits for a Class B digital device,pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protectionagainst harmful interference in a residential installation. This equipment generates, uses, and canradiate radio frequency energy and, if not installed and used in accordance with the instructions,may cause harmful interference to radio communications. However, there is no guarantee thatinterference will not occur in a particular installation. If this equipment does cause harmfulinterference to radio or television reception, which can be determined by turning the equipmentoff and on, the user is encouraged to try to correct the interference by one of the followingmeasures:

- Reorient or relocate the receiving antenna.

- Increase the separation between the equipment and receiver.

- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

- Consult the dealer or an experienced radio/TV technician for help.

This device complies with Part 15 of FCC Regulations. Operation is subject to the following twoconditions: (1) This device may not cause harmful interference, and (2) this device must accept anyinterference received, including interference that may cause undesired operation.

FCC Caution: Any changes or modifications not expressly approved by the party responsible forcompliance could void the user's authority to operate this equipment.

WARNING!

FCC Radiation Exposure Statement:

This portable equipment with its antenna complies with FCCs RF radiation exposure limits set forthfor an uncontrolled environment. To maintain compliance follow the instructions below;

1. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

2. Avoid direct contact to the antenna, or keep it to a minimum while using this equipment.

This transmitter module is authorized to be used in other devices only by OEM integrators underthe following condition:

The transmitter module must not be co-located with any other antenna or transmitter.

Federal Communication Commission Interference Statement





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Starman Electric reserves the right to make changes without further notice to any products orinformation herein. Starman Electric makes no warranty, representation or guarantee regarding the

suitability of its products for any particular purpose, nor does Starman Electric assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all

liability, including without limitation consequential or incidental damages.

The products described are not intended for use in life support systems, appliances or systems

where malfunction of these products can reasonably be expected to result in personal injury, death

or severe property or environmental damage. Starman Electric will not be liable to you or any third

party for any claims or damages arising in connection with above-mentioned uses of the products.Should Buyer purchase or use Starman Electric products for any such unintended or unauthorized

application, Buyer shall indemnify and hold Starman Electric and its officers, employees,

subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses,

and reasonable legal fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that Starman

Electric was negligent regarding the design or manufacture of the part.

Starman Electric conveys no license or title under any patent, copyright, or mask work right to

these products, and makes no representations or warranties that these products are free frompatent, copyright, or mask work infringement, unless otherwise specified.

Copyright 2010 Starman Electric. All rights reserved. Starman Electric, Starman Electric Logo,

DataBridge and combinations thereof, are trademarks of Starman Electric in the US and other countries.

Disclaimer





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Starman Electric

Po Box 13511

San Luis Obispo, CA 93406United States of America

Phone: (805) 699-5312

Website: http://www.starmanelectric.com

Support: [email protected]: [email protected]

Support and Sales Information

User Guide Revisions

Revision Date Notes1.0 01-May-2010 Initial Release

2010 Starman Electric
http://www.starmanelectric.com/mailto:[email protected]:[email protected]:[email protected]:[email protected]://www.starmanelectric.com/

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