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Dataradio DL-3282 Manual

1200 baud modem
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DL-3282
1200 Baud Modem
Part Number : 250-3282-002
S e r v i c e M a n u a l

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  • Page 1 DL-3282 1200 Baud Modem Part Number : 250-3282-002 S e r v i c e M a n u a l...
  • Page 2 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.

  • Page 3: Table Of Contents

    DL-3282 1200 BAUD MODEM SPECIFICATIONS ........
  • Page 4 TABLE OF CONTENTS PARTS LIST COMPONENT LAYOUT SCHEMATIC LIST OF TABLES 3282 INTERCONNECT CABLES ............. .2-1 SWITCH S101 SETTINGS FOR BELL103/202.

  • Page 5: General Information

    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.

  • Page 6: Product Warranty

    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...

  • Page 7: Dl-3282 1200 Baud Modem Specifications

    GENERAL INFORMATION 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)

  • Page 8: Interconnect Cable Installation

    SECTION 2 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.

  • Page 9: User Interface

    MODEM SETUP Sub_Aud_Data Tx_Rx Length: 18 in (connector end to connector end) 3 ft (power supply terminals to JSLM connector end) ™ RNet /JSLM Interconnect Cable (697-3282-012) ™ 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 &...

  • Page 10: 3282 Leds

    MODEM SETUP 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.

  • Page 11: Dip Switch S101 Settings

    MODEM SETUP The following tables (2-2 through 2-4) show the various settings for Dip Switch S101 pictured in Figure 2-4. Table 2-2 SWITCH S101 SETTINGS FOR BELL 103/202 Full/ Baud Operating Mode Half Tx Freq Rx Freq DIP Switch S101 Rate Space Mark Space Mark (0=Off, 1=On)

  • Page 12: Switch S101 Test Mode Settings

    MODEM SETUP Table 2-4 SWITCH S101 NORMAL/CONVENTIONAL MODE OPTION SETTINGS DIP Switch S101 (0=Off, 1=On) Function FSK Mode (Audio from and to the Modem IC is not routed through the filters on board). This Mode is to be routed into an FSK/Audio Port of the Radio. WB Mode (Audio from and to the Modem IC is routed through the audio filters on board).

  • Page 13: Dip Switch S101

    MODEM SETUP S101 Figure 2-4 DIP SWITCH S101 2.3.2 DIP SWITCH S101 DIP switch S101 has been factory set for the “Normal / Conventional / Bell 202 Half-Duplex / Active High Squelch / 103 Originate Mode / FSK / CTS= 240 ms” mode. The factory default setting for the RTS to CTS time is set to the maximum delay for compatibility with a wide range of products.
  • Page 14 MODEM SETUP c.Monitor the AC voltage at TP400, J102. Adjust R400 for 400 mVrms if using a DRL telemetry transceiver. If another transceiver is used, adjust R400 as required. J103 pin 5 has a resistor that will drop the Tx output ™...

  • Page 15: Theory Of Operation

    SECTION 3 THEORY OF OPERATION EXTERNAL J102 CONNECTOR FREQ SELECT RSSI +13.6V +13.6V 9 GROUND 10 RX DATA WB IN WB OUT TX DATA +5V REGULATOR SQUELCH IN PTT OUT U200 +13.6V ADDRESS BUS MOBILE RADIO RESET CONNECTOR J103 PTT OUT Q250/Q251 NORM/LOOP TX MUTE OUT...

  • Page 16: Full-Duplex/Half Duplex Operation

    THEORY OF OPERATION Four integrated circuits on the modem PC board provide most of the modem functions. Microcontroller U220 provides the control functions for Modem IC U230. Modem IC U230 provides filtering and analog/digital conversion of the data. RS-232 interface IC U240 converts the -5V and +5V logic levels from the RS-232 port (J101) to the 0V and +5V TTL levels required by U230 (it also inverts these levels).

  • Page 17: Data Tone Bandwidth

    THEORY OF OPERATION 3.3 DATA TONE BANDWIDTH 3.3.1 INTRODUCTION The baud rate and modulating frequencies utilized by each of the programmable operating formats are shown in Table 2-2. As indicated, 300 baud full- or half-duplex data rates are available with the Bell 103 mode and 1200 baud full- or half-duplex data rates are available with the Bell 202 mode.

  • Page 18: Loopback Modes

    THEORY OF OPERATION 3.4.2 LOOPBACK MODES When a Loopback mode is selected, both the filters in U230 are configured for the same frequency. Half- duplex operation in the Loopback modes is the same as it would be in the General modes because the back channel is not used.

  • Page 19: Delay Period

    THEORY OF OPERATION 3.5.4 DELAY PERIOD When the RTS input of the RS-232 port goes high, a delay period tRC (On) is initiated (refer to Table 3-1). During this delay period, a carrier is transmitted to alert the other modem that data is coming. After this delay period expires, the Clear-To-Send (CTS) output of the RS-232 port goes high to indicate to the data equipment that it may start sending data.

  • Page 20: Receiving Data

    THEORY OF OPERATION Table 3-1 MODEM TIMING PARAMETERS (BELL) Symbol Description Bell 103 Orig Bell 103 Bell 202 Units Answer tRC (On) RTS to CTS on delay 30/60/180/240 30/60/180/240 30/60/180/240 tRC (Off) RTS to CTS off delay tCD (On) Carrier Det on delay 8-20 8-20 6-12...

  • Page 21: Completing Data Reception

    THEORY OF OPERATION 3.6.4 COMPLETING DATA RECEPTION When a loss of carrier tone is detected for a time tCD (Off), the CD output off the RS-232 port goes low (Off) and the RxD output is clamped to a “Mark”. MODEM ASSEMBLY TX KEYING RS-232 TELEMETRY...
  • Page 22 SECTION 4 PARTS LIST 023-3282-352 C 100 610-3674-680 68pF 5% NPO 0603 C 101 610-3674-680 68pF 5% NPO 0603 C 102 610-3674-680 68pF 5% NPO 0603 C 103 610-3674-680 68pF 5% NPO 0603 C 104 610-3674-680 68pF 5% NPO 0603 C 105 610-3674-680 68pF 5% NPO 0603...
  • Page 23 PARTS LIST C 222 610-3675-103 .01MF X7R K 0603 CHPR C 230 610-3674-220 22pF 5% NPO 0603 C 231 610-3674-220 22pF 5% NPO 0603 C 232 610-3609-104 .1UFD X7R J 1206 RL C 233 610-2625-220 22UFD 16V SMD TANT RL C 234 610-3609-104 .1UFD X7R J 1206 RL...
  • Page 24 PARTS LIST C 455 610-3675-102 .001uF 10% X7R 0603 C 456 610-3675-103 .01MF X7R K 0603 CHPR C 457 610-3675-103 .01MF X7R K 0603 CHPR C 458 610-9224-011 4.7UF, 16V,SMD A,20%, TAN C 459 610-9224-011 4.7UF, 16V,SMD A,20%, TAN CR 220 649-4001-215 DUAL COLOR, RED/GRN LED, CR 400...
  • Page 25 PARTS LIST R 221 669-0155-104 100k OHMS J 063W 0603 CHI R 222 669-0155-104 100k OHMS J 063W 0603 CHI R 223 669-0155-104 100k OHMS J 063W 0603 CHI R 224 669-0155-225 2.2 M OHM J 063W 0603 CHI R 225 669-0155-222 2.2K OHMS J 063W 0603 CHI R 227...
  • Page 26 PARTS LIST R 267 669-0155-473 47K OHMS J 063W 0603 CHIP R 268 669-0155-473 47K OHMS J 063W 0603 CHIP R 269 669-0155-473 47K OHMS J 063W 0603 CHIP R 270 669-0155-390 39 OHM J 0603 CHIP/R R 271 669-0155-390 39 OHM J 0603 CHIP/R R 272 669-0155-390...
  • Page 27 PARTS LIST R 457 662-0130-103 10K OHM SMD TRIMMER R 458 669-0155-103 10K OHMS J 063W 0603 CHIP R 459 669-0155-103 10K OHMS J 063W 0603 CHIP R 460 669-0155-471 470 OHMS J 063W 0603 CHIP RM 000 684-1606-062 SLDR 62/36/2 H20 CLEAN S 101 683-5100-108 SMT DIP SW 8 POS SPST...
  • Page 28 PARTS LIST 023-3282-002 A 001 023-3282-350 HAND INSERT 3282 MODEM RE HW 002 675-0604-010 SCR PHILLIPS PANHD 440 HW 003 674-6002-101 HOLE PLUG 3/16IN. HW 004 675-1204-006 SCR #4 PHL FLT 82 ZPS HW 005 696-4504-008 WASHER SHLDR #4X.046 HW 305 675-1604-010 4-40MACH PAN HD ZPS PH ML 000...
  • Page 29 PARTS LIST 250-3282-002 A 001 023-3282-350 HAND INSERT 3282 MODEM RE HW 002 675-0604-010 SCR PHILLIPS PANHD 440 HW 003 674-6002-101 HOLE PLUG 3/16IN. HW 004 675-1204-006 SCR #4 PHL FLT 82 ZPS HW 005 675-1206-306 3/16IN.L. STEEL MACHINE S HW 005 696-4504-008 WASHER SHLDR #4X.046...

  • Page 30: Modem Component Layout

    SECTION 5 COMPONENT LAYOUT Figure 5-1 3282 MODEM COMPONENT LAYOUT ©1999 Dataradio COR Ltd. Company Confidential 001-3282-101/102...

  • Page 31: 3282 Modem Schematic

    RX_AUDIO U450-B R453 R454 U450-C U400-E U450-A MC33174D MC33174D  R457 .XXX APPROVED BY: DATE: 0.01 100K 100K 1999 Dataradio COR Ltd. 0.01 0.01 MATERIAL: C453 R450 R452 R455 APPROVED BY: DATE: RX_DATA C454 COMPANY CONFIDENTIAL WB_SEL 220pF 0.01 C451...

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