Coyote DataCom DR915L Users Manual
DR-915L/LT Data Radio
USER’S GUIDE
Coyote DataCom, Inc. 12721 Benson, Overland Park, KS 66213 • Tel. 913-685-8350 • Fax 913-685-0732
www.coyotedatacom.com • sales@coyotedatacom.com
DR-915L DATA RADIO
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TABLE OF CONTENTS
General Information..............................................................................3
Configuration........................................................................................5
Specifications......................................................................................13
DR-915L Mechanical Overview.............................................................14
DR-915LT Mechanical Overview...........................................................15
Hardware Timing ................................................................................16
In-System Configuration......................................................................20
FCC Compliance Warning and Class B Statement ..................................25
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DR-915L/LT Data Radio
General Information
This DR-915L is a data transceiver operating in the 902-928 MHz ISM band. The DR915LT is a transmit-only version. Both units are designed to operate under Part 15.249
of the FCC rules and regulations.
The unit operates on 62 discrete frequencies within the ISM band, each frequency
about 400kHz apart. Using a frequency agile phase-locked loop synthesizer, the radio is
able to operate on any of 62 non-interfering channels.
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DR-915L/LT DATA RADIO
CONFIGURATION
Default Settings
Serial Baud..............................................................................9600 bits/second
Port......................................................................................................... UART
RX buffer size.................................................................................. 180 bytes*
TX buffer size .................................................................................. 180 bytes*
CTS assert....................................................................................... 180 bytes*
CTS de-assert.................................................................................. 150 bytes*
TX assert.................................................................................180 bytes*/5 mS
Channel..........................................................................................................1
Source Address...............................................................................................1
Destination Group...........................................................................................1
Destination Address ........................................................................................1
Acknowledgement.....................................................................................None
Power save .................................................................................................. Off
*Factory setting; cannot be changed.
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DR-915L/LT DATA RADIO
CONFIGURATION
The DR-915L and DR-915LT are supplied with an easy-to-use Windows98™
configuration program. The configuration program allows the user to control the
operation of their radio network.
Installing
The configuration software does not require an installation. Simply run it from the CD
labeled “DR-915L/LT Tools” or copy it onto another drive. Start the program by
locating and double clicking on the “Programmer” icon. This will launch the
configuration program and display the screen below.
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Click on the “PC Settings” tab, then select which COM port will be used to connect to
the data radio. As shown below, COM1 thru COM4 are available. This setting will be
retained the next time the configuration program is run.
Getting Started
To configure the radio, click on appropriate tab to select the radio type being
configured. Then select the radio Communications Port. The default setting is for
asynchronous serial mode, UART (Universal Asynchronous Receiver/Transmitter). The
default baud rate is 9600 bits per second. The interface baud rate can be set to
standard values between 2400 and 57600 as shown on the following page. This mode
supports 8 data bits, 1 stop bit and no parity.
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DR-915L
DR-915L Repeater DR-915LT
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Addressing
The radio has been designed to be very versatile in its addressing functions. Each radio
unit has its own identifier consisting of a group number and address number.
The Source Group specifies which group of radios the unit being configured belongs to.
The Source Address specifies the address within that group that uniquely identifies this
radio. The radio will decode packets containing a Destination Group and Address
matching its own. With the exception of broadcast messages, all others will be ignored.
Broadcast messages are those messages where the destination address is 0 and the
group is the same as the radio receiving it, or those messages where the destination
address and group are both 0. When the destination group is set to 0, all radios in all
groups will decode the packet.
Likewise, the Destination Group specifies which group of radios the transmissions will
go to. The Destination Address specifies the individual radio within that group that will
receive the message.
Channel
The Channel selects the frequency the radio will transmit and receive on. There are 62
channels available for the use of multiple networks or to avoid interference. Radios
must be on the same channel to communicate.
TX Hold Off Time
TX Hold Off Time sets the amount of time that must elapse after the last byte to be
transmitted is received by the radio before a transmit packet will be initiated. Setting
this value higher will prevent numerous small packets from being sent when the
transmit data is not continuous. The default setting will be adequate for most
applications.
Acknowledgement (Ack-Back™)
The DR-915L has powerful, built-in path management features designed to make OEM
integration quick and easy. Activating packet acknowledgement will virtually guarantee
all data transmitted is received. Any packet transmitted by the DR-915L is then
acknowledged by the receiving radio. If any packet is not acknowledged, the
transmitting radio will resend the data. While reducing throughput, this feature also
handles missed transmissions as well as performs path management, allowing full
duplex communications.
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