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.
DR-915L DATA RADIO ___________________________________________________________________________________________ TABLE OF CONTENTS General Information ..............................................................................3 Configuration........................................................................................5 Specifications...................................................................................... 13 DR-915L Mechanical Overview ..............................................
DR-915L DATA RADIO ___________________________________________________________________________________________ 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.
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO C ONFIGURATION Default Settings Serial Baud ..............................................................................9600 bits/second Port......................................................................................................... UART RX buffer size ..................................................................................
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO C ONFIGURATION 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.
DR-915L DATA RADIO ___________________________________________________________________________________________ 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.
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L DR-915L Repeater Revision G DR-915LT USER’S GUIDE 7
DR-915L DATA RADIO ___________________________________________________________________________________________ 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.
DR-915L DATA RADIO ___________________________________________________________________________________________ The numeric value populated in the Retries field specifies the number of attempts the radio will make in trying to resend unacknowledged packets. The value in the Timeout field determines how long the radio will wait for the acknowledgement before resending. (See Hardware Timing for more information) Number of Repeaters The range of the DR-915L/LT may be extended by using repeaters.
DR-915L DATA RADIO ___________________________________________________________________________________________ Path Management The DR-915L/LT has powerful path management tools to help ensure successful field installations. The Path Management window has two modes, Continuous and On Sync. The Continuous mode allows the installer to look at competing signals on the radio’s channel and determine if there is a potential interference problem.
DR-915L DATA RADIO ___________________________________________________________________________________________ The On-Sync mode allows the installer to look only at radio transmissions for DR-915L or DR-915LT radios. When packets are received, the transmission’s current and maximum signal strength is displayed along with the packets’ source group code and address. This allows the installer to ensure there is adequate signal strength with enough fade margin to guarantee reliable operation.
DR-915L DATA RADIO ___________________________________________________________________________________________ Code Upgrading The DR-915L and DR-915LT have been designed for easy field upgrades. Using the RS232 Serial Adapter board, a DR915 Programming cable, a standard Serial Configuration cable and a current version of the DR-915L/LT Configuration program running on the user’s PC, the radio can be re-flashed with new operating code. Special customer code can also be loaded in this manner.
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO S PECIFICATIONS Overall Frequency .................................................................................... 902-928 MHz Frequency Control......................................................................PLL Synthesizer Transport .............................................. Transparent, Point-to-Point Guaranteed Data Interface ...............................
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT Data Radio R ADIO H ARDWARE I NTERFACE DR-915L Mechanical Overview Revision G USER’S GUIDE 14
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO R ADIO H ARDWARE I NTERFACE DR-915LT Mechanical Overview Revision G USER’S GUIDE 15
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO H ARDWARE I NTERFACE Pin Definitions for Connector P2 (915L) and P4 (915LT) PIN 1 2 3 4 5 6 7 8 9 10 FUNCTION Ground CTS DTR Receive Data Transmit Data Reset SPI Clock SPI MISO/Fail SPI MOSI/Sending VCC PIN 1 – Ground Power and signal ground for the data radio. PIN 2 – CTS Clear to Send. This line will be low when the radio is ready to accept data to transmit.
DR-915L DATA RADIO ___________________________________________________________________________________________ level interface. Applications requiring RS-232 must use an appropriate interface circuit or a DR-915L RS-232 interface board. PIN 5 – Transmit Data This is the data sent by the user device for the radio to transmit. The data format is a standard asynchronous stream at the user-set baud rate with one start bit (low) followed by eight data bits and at least one stop bit (high).
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO H ARDWARE T IMING Ack-Back™ Handshaking When configured for Ack-Back™ mode, the radio will attempt to resend packets that are not acknowledged as received by the destination radio. While this virtually guarantees that data will be correctly transmitted, there is still the possibility that the destination radio is unavailable.
DR-915L DATA RADIO ___________________________________________________________________________________________ If and acknowledgement is not received within the Ack-Back™ Timeout time, the radio will resend the packet up to the Ack-Back™ Retries setting. If an acknowledgment is received during one of the retries, the SNDING signal will return low, indicating a successful transmission.
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915 D ATA R ADIO I N -S YSTEM C ONFIGURATION The DR-915 may be reconfigured while in a host system. This allows the users system to change the source or destination address and group codes on-the-fly, adding great versatility to the Ack-Back™ delivery mode.
DR-915L DATA RADIO ___________________________________________________________________________________________ Command Structure The format of the data bytes for sending a command to the radios is as follows: Read command: - 0x01 (1 byte) - memory select (1 byte) (0 = read from EEPROM, 1 = read from RAM) - beginning address (high byte) (1 byte) - beginning address (low byte) (1 byte) - number of bytes to be read (1 byte) Write Command: - 0x02 (1 byte) - memory select (1 byte) (0 = write to EEPROM, 1 = writ
DR-915L DATA RADIO ___________________________________________________________________________________________ Addresses of Settings CAUTION! The radio software performs no validation of settings. Great care should be taken when programming any of these settings. DR915L Address Map: 0x0001 = Channel (Valid range = 0 – 63) 0x0002 = Tx Holdoff (Valid range = 5 - 255. Default = 5.) 0x0003 = Preamble Bytes (high byte) (Valid range = 16 - 1000. Default = 16.
DR-915L DATA RADIO ___________________________________________________________________________________________ DR915L Repeater Address Map: 0x0001 = Channel (Valid range = 0 – 63) 0x0002 = Preamble Bytes (high byte) (Valid range = 16 - 1000. Default = 16. A value of less than 16 will cause improper operation.
DR-915L DATA RADIO ___________________________________________________________________________________________ *Baud Rate settings for the DR915L and Repeater are as follows: 2400 baud = 215 4800 baud = 107 9600 baud = 53 (default) 14400 baud = 35 19200 baud = 26 28800 baud = 17 38400 baud = 12 (not recommended for use) 57600 baud = 8 *Baud Rate settings for the DR915LT are as follows: 2400 baud = 207 4800 baud = 103 9600 baud = 51 (default) 14400 baud = 34 19200 baud = 25 28800 baud = 16 38400 baud = 12 5
DR-915L DATA RADIO ___________________________________________________________________________________________ DR-915L/LT D ATA R ADIO R EGULATORY FCC Compliance Warning Changes or modifications to the DR-915L/LT not expressly approved by Coyote DataCom, Inc. could void the user’s authority to operate this product. Note: 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.
