Dataradio DL-3282 User manual

S e r v i c e M a n u a l
DL-3282
1200BaudModem
PartNumber: 250-3282-002

DL-3282
1200 Baud Modem
Revision 001
001-3282-101/102 May 1999
Supersedes 001-3282-003 March 1999
Copyright” 1999 by Dataradio COR Ltd.
Dataradio COR Ltd. designs and manufactures radios and radio modems to serve a wide variety of data
communication needs. Dataradio produces equipment for the fixed data market including SCADA
systems for utilities, petrochemical, waste and fresh water management markets and RF boards for OEM
applications in the Radio Frequency Data Capture market.
PRODUCT WARRANTY
The manufacturer's warranty statement for this product is available from Dataradio COR, Ltd. 299
Johnson Avenue, Box 1733, Waseca, MN 56093-0833. Phone [phone].
The information in this document is subject to change without notice.
is a trademark of DATARADIO,Inc.

i
Part No. 001-3282-101/102
TABLE OF CONTENTS
1GENERAL INFORMATION
1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 MODEM DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.3 FACTORY TECHNICAL SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.4 PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.5 REPLACEMENT PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.6 FACTORY REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
DL-3282 1200 BAUD MODEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2MODEM ADJUSTMENTS AND SETUP
2.1 INTERCONNECT CABLE INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
USER INTERFACE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
3282 LEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 2-3
2.2 FACTORY DEFAULT SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
RECEIVE INPUT LEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
DIP SWITCH S101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
TRANSMIT OUTPUT LEVEL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
3THEORY OF OPERATION
3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 FULL-DUPLEX/HALF DUPLEX OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.3 DATA TONE BANDWIDTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
PHONE LINE AND RF LINK BANDWIDTH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.4 GENERAL AND LOOPBACK MODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
GENERAL MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
LOOPBACK MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.5 TRANSMITTING DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
DTR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
RTS SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
DELAY PERIOD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
DATA FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
COMPLETING DATA TRANSMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.6 RECEIVING DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
DTR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
CARRIER DETECT (CD) SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
COMPLETING DATA RECEPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7

TABLE OF CONTENTS
ii
Part No. 001-3282-101/102
4PARTS LIST
5COMPONENT LAYOUT
6SCHEMATIC
LIST OF TABLES
2-1 3282 INTERCONNECT CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 SWITCH S101 SETTINGS FOR BELL103/202. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2-3 DIP SWITCH S101 SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4
2-4 SWITCH S101 NORMAL CONVENTIONAL MODE OPTION SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
2-5 SWITCH S101 TEST MODE SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
3-1 MODEM TIMING PARAMETERS (BELL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
LIST OF FIGURES
2-1 DL-3400 EXTERNAL CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2-2 RNet/ JSLM EXTERNAL CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2-3 RS-232 CONNECTOR PINOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2-4 DIP SWITCH S101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
2-5 MODEM BOARD ADUSTMENT POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7
3-1 MODEM BOARD BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
3-2 MODEM TONE FREQUENCY BANDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
3-3 MODEM INTERCONNECT DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
5-1 3282 MODEM COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
6-1 3282 MODEM SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

SECTION 1
1-1
001-3282-101/102
GENERAL INFORMATION
1.1 INTRODUCTION
This manual contains setup and service information for the RS-232 Dataradio COR Ltd. Modem. This
modem can be purchased separately or as part of a telemetry module as described in the next section. Since the
telemetry module service manuals do not include modem servicing information, this service manual is used in all
applications.
1.2 MODEM DESCRIPTION
This modem can be purchased separately using Part No. 250-3282-002, or as part of a DRL DL-3400 or
DRL JSLM/RNetTelemetry Module using Part No. 023-3282-002.
The function of a modem is to convert digital data into an analog signal that can be used to modulate an
RF carrier. It also converts these analog signals back into digital data. This allows digital data to be transmitted and
received using an RF link.
This modem is compatible with Bell 103/202 standards for modems. It has an RS-232 compatible port for
interfacing with data equipment. An RF transmitter, receiver, or transceiver is required with this modem unless it is
used with some other type of link such as a phone line. Refer to Section 3 for a complete description of modem
operation.
1.3 FACTORY TECHNICAL SERVICE
The Technical Service Department provides customer assistance on technical problems and serves as an
interface with factory repair facilities. They can be reached in the following ways:
Dataradio COR Ltd.
299 Johnson Avenue, P.O. Box 1733
Waseca, MN 56093-0833
Technical Service hours are: Monday to Friday 7:30 AM to 4:30 PM, Central Time
Phone: [phone]
or 1-507-833-8819
Fax:[phone]
Email address: [email protected]

GENERAL INFORMATION
1-2
001-3282-101/102
1.4 PRODUCT WARRANTY
The warranty statement for the Integra-TR is available by contacting your sales representative or by
sending your request to Dataradio COR Ltd. (see Section 1.3 for address).
1.5 REPLACEMENT PARTS
This product is normally not field-serviceable, except by the replacement of complete units. Specialized
equipment and training is required to repair logic boards and radio modems.
1.6 FACTORY REPAIR
Dataradio products are designed for long life and failure-free operation. If a problem arises, factory
service is available. Contact the Technical Service Department before returning equipment. A service
representative may suggest a solution eliminating the need to return equipment.
A Return Material Authorization (RMA) is required when returning equipment to Dataradio for repair.
Contact the Technical Service Department at 800-992-7774, extension 6707 to request an RMA number. Be
prepared to give the equipment model and serial number, your account number (if known), and billing and
shipping addresses.
Include the RMA number, a complete description of the problem, and the name and phone number of a
contact person with the returned units. This information is important. The technician may have questions that need
to be answered to identify the problem and repair the equipment. The RMA number helps locate your equipment
in the repair lab if there is a need to contact Dataradio concerning the equipment. Units sent in for repair will be
returned to the customer re-tuned to the current Dataradio Test and Tune Procedure and will conform to all
specifications noted in this section
Customers are responsible for shipping charges (to Dataradio) for returned units in warranty. Units in
warranty are repaired free of charge unless there is evidence of abuse or damage beyond the terms of the warranty.
Dataradio covers return shipping costs for equipment repaired while under warranty.
Units out of warranty are subject to repair service charges. Customers are responsible for shipping charges
(to and from Dataradio) on units out of warranty. Return shipping instructions are the responsibility of the
customer.

GENERAL INFORMATION
1-3
001-3282-101/102
DL-3282 1200 BAUD MODEM SPECIFICATIONS
The following are general specifications intended for use in testing and servicing this modem. These
specifications are subject to change without notice.
FCC ID Part 15
Dimensions (LxWxH) 4.75” x 2.90” x 1.237” (12.07cm x 7.37cm x 3.14cm)
Operating Voltage 7 to 16 VDC
Current Drain Less than 50mA
Temperature Range -30°C to +60°C
Data Interface EIA RS-232C Standard: DB-25 subminiature connector, female
DRLTM Brand Radio Interface 10-pin 3M type 3325 connector
RTS/CTS 30/60/180/240 msec
Data Rates FSK: 1200, 300 BPS
Data Format Transparent to asynchronous data
Bit Error Performance Less than 1 x 10-6 at 18 dB SINAD with 3.3 kHz deviation and
25 kHz RF channel bandwidth
Transmit Keyline Driver logic low open-collection NPN transistor with emitter
grounded IC(max.) = 100 mA; VCE-ON (max.) = 0.3 V

SECTION 2
2-1
001-3282-101/102
MODEM SETUP
2.1 INTERCONNECT CABLE INSTALLATION
2.1.1 INTRODUCTION
The modem requires a power source with an operating voltage range of 7 - 16 Vdc. NOTE: Transceiver
may require a more restricted operating range. Interconnect cables are available from DRL. Contact your sales
representative for details. Table 2-1 3282 INTERCONNECT CABLES
The external connector on the modem is a 3M-type male 10-pin ribbon connector. As shown in Figures 2-
1 and 2-2, only one power connection is required. Also shown in Figures 2-1 and 2-2 are the pin designations for
these connectors. Install these cables as required for your particular installation.
Figure 2-1 DL-3400 EXTERNAL CONNECTOR
TRANSCEIVER
MODEL DRL CABLE # CONNECTOR TYPES
DL-3400 023-3410-125 10-Pin (2)*(to spade terminals)
RNet/ JSLM 697-3282-012 DE-15 (1) & DA-15 (1)*
MODEM 10-PIN CONNECTOR ASSIGNMENTS
PIN FUNCTION
TYPICAL
COLOR
1
2
3
4
5
6
7
8
9
10
BROWN
BLUE
VIOLET
GREEN
RED
ORANGE
GRAY
YELLOW
BLACK
WHITE
Wideband Out
Wideband In
NOT USED
NOT USED
SUPPLY VOLTAGE (+)
TX KEY (PTT) OUT
CARRIER DETECT IN
TX NARROW BAND DATA OUT
GROUND (-)
RX NARROW BAND DATA IN
MODEM
TRANSCEIVER
1
2
9
10
10-Pin Connector Pinout
Note: Using Pins 1 & 2 to transmit data is not FCC approved. PART NO. 023-3410-125
(length: 3 ft.)

MODEM SETUP
2-2
001-3282-101/102
Figure 2-2 RNet/JSLM EXTERNAL CONNECTORS
2.1.2 USER INTERFACE
The 3282 interfaces with user equipment through the DB-25 RS232 connector. See Figure 2-3 for pinout
details.
RS-232 PINOUT & DESCRIPTION
1 Shield_GND J101-1
2 RS232_ DCE RXD J101-2
3 RS232_ DCE TXD J101-3
4 RS232_RTS J101-4
5 RS232_CTS J101-5
6 RS232_DSR J101-6
7 RS232_GND J101-7
8 RS232_DCD J101-8
20 RS232_DTR J101-20
Interconnect Cable (697-3282-012)
Length: 18 in
(connector end to connector end)
3 ft (power supply terminals
to JSLM connector end)
RNet/JSLM
Tx_Rx
Sub_Aud_Data
7 8 9 10 11 1265432 131
14 15 16 17 18 19 20 21 22 23 24 25
Figure 2-3 RS-232 CONNECTOR PINOUT

MODEM SETUP
2-3
001-3282-101/102
2.1.3 3282 LEDS
The 3282 has 2 LEDs (CR220) that are visible through the adjustment hole in the case closest to the 10 pin connector.
One LED will flash green whenever the modem has power and the microcontroller U220 is operating correctly. The
other red LED will be solid red whenever the modem is transmitting.
2.2 FACTORY DEFAULT SETTINGS
2.2.1 INTRODUCTION
Normal
Conventional
Bell 202
Half Duplex
Active High Squelch
FSK Audio
240 ms RTS to CTS Delay
100 mS Soft Carrier Turnoff debounce time
Transmit Input Level (pre-set for 400 mVrms)
The factory default setting for the RTS to CTS time is set to the maximum delay for compatibility with a
wide range of products. When used with DRL synthesized radios (DL-3400 and JSLM/RNet) a shorter delay
time (30 ms) may be used. These settings may require adjustment in the field to optimize performance in your
application.
2.2.2 RECEIVE INPUT LEVEL
For proper operation of the modem, the carrier level from the transceiver should be 35 mVrms -1 mVrms
(or 99 mVp-p - 2.8 mVp-p). DRL transceivers are factory adjusted to provide a data level output to the modem of
707 mVrms (or 2 V p-p) for use with the DRL DL-3400. The data level output to the modem when used with the
DRL JSLM/RNet is 212 mVrms +17.5 mVrms (or 0.6 V p-p +0.05 V p-p).
2.3 ADJUSTMENTS
2.3.1 INTRODUCTION
There are two adjustments on the modem board. These adjustments have been set at the factory and may require
further adjustment in the field for your application.
DIP Switch S101
Transmit Level R400