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JPS RTU-292 Installation And Operation Manual

Jps communications, inc. rtu-292 radio / telephone interface unit installation and operation manual
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Installation and Operation Manual
RTU-292
RADIO / TELEPHONE
INTERFACE UNIT
Designed and Manufactured by:
JPS Communications, Inc.
5800 Departure Drive
Raleigh, NC 27616
e-mail: jps@jps.com
JPS P/N 5970-600200
Revision 1.62
July, 2005
1
JPS Communications, Inc.

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Summary of Contents for JPS RTU-292

  • Page 1 Installation and Operation Manual RTU-292 RADIO / TELEPHONE INTERFACE UNIT Designed and Manufactured by: JPS Communications, Inc. 5800 Departure Drive Raleigh, NC 27616 e-mail: jps@jps.com JPS P/N 5970-600200 Revision 1.62 July, 2005 JPS Communications, Inc.

  • Page 2: Warranty

    RTU-292 Operations Manual JPS Communications, Inc. warrants its manufactured equipment to be free from defects in materials and workmanship, and to conform to published specifications for a period of 18 months from the date of shipment from the factory or 12 months from installation, whichever occurs first.

  • Page 3: Table Of Contents

    POWER REQUIREMENTS ... 2-4 INPUT POWER SELECTION ... 2-4 2.7.1 LINE VOLTAGE SELECTION ... 2-4 2.7.2 DC INPUT POWER SELECTION... 2-4 CONFIGURING THE RTU-292 ... 2-5 2.8.1 PROGRAMMING MODE SETUP PARAMETERS ... 2-5 2.8.2 SETTING TELEPHONE SEND AND RECEIVE LEVELS... 2-5 2.8.3 VOX HANGTIME...
  • Page 4 3.3.7 P1 AC POWER CONNECTOR ...3-4 OPERATION ...3-5 3.4.1 OPERATION OVERVIEW ...3-5 3.4.2 USE OF THE RTU-292 SPEAKER TO MONITOR AUDIO ...3-5 3.4.3 PLACING A TELEPHONE CALL...3-5 3.4.4 RECEIVING A TELEPHONE CALL ...3-6 3.4.5 PUTTING A TELEPHONE CALL ON HOLD ...3-6 3.4.6...
  • Page 5 DIAL/BUSY GENERATORS ... 4-26 4.6.3 LOCAL TELEPHONE LINE INTERFACE... 4-26 REMOTE CONTROL PROTOCOL ... 5-1 GENERAL ... 5-1 RS-232 REMOTE CONTROL OVERVIEW ... 5-1 COMMANDS SENT TO THE RTU-292 ... 5-1 5.3.1 NULL Command ... 5-3 5.3.2 Auto Answer Command... 5-3 5.3.3 Audible Ring Command...
  • Page 6 Initiate Call Via Attention Signal ...7-11 7.5.2 RTU-292 Response to Attention Signal ...7-11 7.5.3 Radio Caller Provides Calling Directions...7-11 7.5.4 RTU-292 Plays Back Phone Number & Prompts for Confirmation...7-11 7.5.5 RTU-292 Places the Call ...7-11 7.5.6 After the Call Begins ...7-12 SQUELCH BREAK ACCESS OPTION...7-13 7.6.1...
  • Page 7 IGURE UTLINE IMENSIONS IGURE ONTROL AND ONNECTOR IGURE OCATION NTERNAL IGURE NTERNAL PTION ETTING IGURE UDIO NTERFACE IRING ... 2-23 IGURE NTERFACE ETAILS IGURE YBRID ALANCE VOX S IGURE ENSITIVITY IGURE OICE ROMPT PTION IGURE OCAL HONE PTION VMM-100 O IGURE PTION NSTALLATION...

  • Page 8: List Of Tables

    RTU-292 Operations Manual ABLE QUIPMENT AND CCESSORIES ABLE PTIONAL QUIPMENT RTU-292 SPECIFICATIONS...1-6 ABLE RTU-292 F ABLE ACTORY ABLE ECOMMENDED HONE ABLE ELEPHONE ECEIVE VOX H ...2-7 ABLE ANGTIME VOX S ...2-7 ABLE ENSITIVITY ...2-8 ABLE ...2-9 ABLE UPLEX ...2-9 ABLE...

  • Page 9: Jps Communications,

    Adaptation The process whereby the RTU-292 DSP algorithms detect reflected signal information in a connected line and tune the DSP hybrid for a broadband null with minimum reflection. Carrier Operated Relay - A receiver signal that gives a positive indication that a carrier or signal is being received and that the receiver is unsquelched.
  • Page 10 RTU-292 Operations Manual This page intentionally left blank. JPS Communications, Inc.

  • Page 11: Jps Communications,

    First, a radio-to-radio link is established. Then, using the telephone in the RTU-292, the operator places a phone call to the distant telephone that will be patched into the radio link. Once the telephone-to-telephone link is made, the operator simply pushes a front panel pushbutton.

  • Page 12: Assemblies

    The Local Phone Option allows a standard telephone set to be plugged into the rear panel of the RTU-292; this local phone may then be used in place of the unit's keypad and handset.

  • Page 13: Front Panel Switch Assemblies

    LEDs, audio prompts, etc., are controlled accordingly. 1.3.1.6 Power Supply Section The power supply in the RTU-292 is a quiet and reliable passive regulator type. It furnishes regulated voltages of +12V, -12V, +5V and -5V to the unit. 1.3.2 FRONT PANEL SWITCH ASSEMBLIES There are three separate front panel switch assemblies that contain the pushbutton switches and LED indicators for the RTU-292.

  • Page 14: A Ccessories S Upplied

    RTU-292 Operations Manual Table 1-1 Part Number 5970-600000 5970-600200 5970-600150 Accessory Kit Consists of: Part Number 0150-200000 0313-037770 0313-060000 0360-009000 0650-005100 0650-010100 0827-000001 0827-102401 0833-063205 0837-103200 0848-100001 JPS Communications, Inc. Equipment and Accessories Supplied Item RTU-292 Standard Operation & Maintenance Manual...

  • Page 15: Options

    1.3.4 OPTIONS RTU-292 options include the: The Voice Prompt Option, which gives verbal prompts to the user as an aid in all aspects of unit operation; The Local Phone Option, which allows a DTMF telephone set to be plugged into the unit, allowing control and access from the phone set; and the VMM-100 module, used to add VMR (Voice Modulation Recognition) and DSP noise reduction capability.

  • Page 16: Table 1-3 Rtu-292 Specifications

    RTU-292 Operations Manual Table 1-3 TELEPHONE LINE INTERFACE (J2, Male DB-9 Connector) Output & Input Levels to Phone Line Frequency Response Output Impedance to Phone Line VOX Sensitivity VOX Hang Time Hybrid Balance/Adaptation Speed (into 600 Ohm) Ultimate Hybrid Balance (into 600 Ohm)

  • Page 17: Installation

    2.1 GENERAL This section provides the instructions for unpacking, inspection, installation and set-up. Also included are directions for reshipment of damaged parts or equipment. 2.2 UNPACKING AND INSPECTION After unpacking the unit, retain the carton and packing materials until the contents have been inspected and checked against the packing list.

  • Page 18: Figure

    Careful attention to the following installation suggestions should result in the best unit/system performance. Figure 2.1 provides overall unit dimensions. The RTU-292 must be installed in a structure that provides both protection from the weather and assurance of ambient temperatures between -20 and +55 degrees C. Since the unit is neither splashproof nor corrosion resistant, it must be protected from exposure to salt spray.

  • Page 19: D Efault S Ettings

    Table 2-1 This table describes the settings of all RTU-292 internal adjustments and switch positions as set when the unit is shipped. Feature / Function Telephone Send and Receive Levels Dial Mode VOX Sensitivity VOX Hangtime Full/Half Duplex RX Audio Interface...

  • Page 20: Power Requirements

    RTU-292 Operations Manual 2.6 POWER REQUIREMENTS The RTU-292 is designed to operate from 115V or 230V, 47 to 63 Hz, single phase AC power source. The unit will meet all of its specifications over a voltage range of +15% from nominal.

  • Page 21: Figure

    The RTU-292 is set in the factory to the +24/+28 VDC position. 2.8 CONFIGURING THE RTU-292 The RTU-292 factory default settings are listed in Table 2-1. The factory set-up will be correct for most installations; explanations of each feature selection method or other adjustment are provided for systems requiring different set-ups.

  • Page 22: R Eceive L Evels

    Field Wire not connected to a telephone network When using the RTU-292 in a domestic U.S. dial-up telephone network, the MAXIMUM level allowed into a telephone line at the subscriber end is -9 dBm. Putting more level into the line than this will NOT increase performance, but will result in distortion, crosstalk into other circuits and the telephone company may disconnect the call.

  • Page 23: Vox Hangtime

    2.8.3 VOX HANGTIME The RTU-292 VOX circuitry holds the radio in the keyed state for a short time after the telephone audio signal is no longer detected. This delay, called hangtime, ensures that the VOX is not de-activated between syllables or during short pauses in speech. The standard VOX hangtime duration is 2.0 seconds.

  • Page 24: Rx Line Input Impedance

    The dialing mode of the RTU-292’s internal telephone is set by internal dipswitch SW1-4. The dial mode choices are DTMF and 10pps Pulse. DTMF should always be used if the RTU-292 is interfaced with a touch-tone (DTMF) capable telephone line. Note that, even when set for pulse dialing, the RTU-292 can still send DTMF tones onto the phone line to control automated systems such as voice mail.

  • Page 25: Serial Port Baud Rate

    SW1-1 2.8.11 RADIO CONTROL MODE Dipswitch SW1-3 enables the RTU-292 to be put into the Radio Control Mode via one of its DTMF commands. In this mode the RTU-292 can be used to relay radio control commands via its RS-232 port to a companion Motorola URC-200 radio. The factory default disables this mode, with SW1-3 set to OFF.

  • Page 26: Enable

    SW1-8 enables the Local Phone Ring-Through feature. This causes the local phone to ring whenever a call is received by the RTU-292 via the PSTN input. When disabled, the local phone may still be used to send and receive calls, but will not ring when a call is received. Set SW1-8 to On to enable Local Phone Ring-Through, and Off to disable this feature.

  • Page 27: R Ingthrough

    Table 2-12 SW1-7 Table 2-13 SW1-8 2.8.15 TRANSMIT LEVEL SET-UP MODE Dipswitch SW2-7 is used by the factory to enable a special set-up mode. See section 2.10 for instructions. This switch must remain Off (Normal Mode) for standard operation. Table 2-14 SW2-7 2.8.16 MISCELLANEOUS JUMPERS The following jumpers are installed in the factory as required.

  • Page 28: Table

    Connect the radio system to the RADIO J2 connector. The TX output and RX input are designed to interface with 600 Ohm line connections at the radio, but the RTU-292 audio interface is extremely flexible and can accommodate a wide variety of sources and loads. By making different connections, the inputs and outputs may be configured for balanced or unbalanced lines.

  • Page 29: Table

    Table 2-16 2.9.3 HANDSET CONNECTOR The handset supplied with the RTU-292 is plugged into front panel jack J7. Table 2-17 P1-RADIO (DB-9 Male) Function Balanced Receive Audio Input B Chassis Ground Transmit Audio Output A External Signal Input /Key Output A (Relay Closure to Ground)

  • Page 30: Terminal Block

    RTU-292 Operations Manual 2.9.4 TERMINAL BLOCK The terminal block on the rear panel is supplied for convenience when interfacing the RTU-292 to a communications system. The terminal block connections are in parallel with the I/O terminals of the same name found on different connectors. If the telephone line connections at Pin 1 and 2 of the terminal block are used to connect to PSTN line, then the TEL LINE connector, J1, should not be used.

  • Page 31: Onnector (Db-9 M Ale )

    There are two ways (detailed below) to set the transmit level: First apply TX audio by one of two methods: (A) Use a 1 kHz test tone supplied by the RTU-292 when in the Transmit Level Set-Up Mode, or (B) simply speak into the telephone line to supply typical audio to the RTU- 292.

  • Page 32: Setting The Receive Level

    OFF, and turning the power back on. 2.10.2 SETTING THE RECEIVE LEVEL The audio level into the RTU-292 from the radio receiver is set by the internal RX Level adjustment potentiometer, R116. The PEAK LED responds to the receiver audio coming from the radio and is provided as a guide to setting this level (there are two peak LEDs, CR24 on the Main Board as well as the front panel PEAK LED).
  • Page 33 The proper operation and excellent performance of the RTU-292 will not be obtained if the audio level from the receiver into the RTU-292 is not set correctly. Excessive audio will overload the telephone line and equipment, causing distortion, VOX falsing and poor hybrid operation.
  • Page 34 RTU-292 Operations Manual Figure 2-1 Outline Dimensions JPS Communications, Inc. 2-18...

  • Page 35: Onnector L Ocations

    -292 Operations Manual Figure 2-2 Control and Connector Locations 2-19 JPS Communications, Inc.

  • Page 36: O Ption S Ettings

    RTU-292 Operations Manual Figure 2-3 Location Of Internal Option Settings JPS Communications, Inc. 2-20...

  • Page 37: S Etting D Etails

    -292 Operations Manual Figure 2-4 Internal Option Setting Details 2-21 JPS Communications, Inc.

  • Page 38: W Iring D Iagram

    RTU-292 Operations Manual Figure 2-5 Audio Interface Wiring Diagram JPS Communications, Inc. 2-22...
  • Page 39 -292 Operations Manual Figure 2-6 Interface Details 2-23 JPS Communications, Inc.

  • Page 40: Table

    See section 7 for installation instructions for all field-installable options. Section 7 also explains how to set-up any options that have configuration switches, jumpers, potentiometers, etc. For any options not covered in section 7, refer to custom notes supplied with the RTU-292 or the option, or contact JPS for information.

  • Page 41: Operation

    (mounting screws are installed in the front panel, remove the nuts from these screws, throw the nuts away, and use the screws to attach the hanger). This hanger, supplied in the RTU-292's accessory kit, may also be installed elsewhere on the equipment rack.

  • Page 42: Keypad

    These three buttons, PHONE, RADIO and OFF, determine whether the internal telephone, the radio, both, or neither (OFF) are connected to the telephone line. Pushing the TEL LINE/PHONE button connects the RTU-292 internal telephone to the telephone line and allows dialing using the keypad. Pushing this button will also answer an incoming telephone call.

  • Page 43: Speaker Buttons

    (incoming call) is always provided. 3.2.15 KEY PUSHBUTTON This pushbutton operates the key function of the RTU-292, sending a key command to the associated transmitter. This button is functional at all times. The red KEYED LED next to the...

  • Page 44: Rear Panel Connectors

    AC power connector/voltage selector/fuse holder assembly. See section 2.9 for full pin-out information. 3.3.1 P1 RADIO CONNECTOR This male DB9 connector is the interface between a radio system and the RTU-292. It contains transmit audio, receive audio, and keylines. 3.3.2 J1 TEL LINE The RJ11C jack provides the telephone line connection to the RTU-292.

  • Page 45: Operation

    3.4 OPERATION 3.4.1 OPERATION OVERVIEW The RTU-292 is a flexible piece of equipment that contains a telephone and a radio/telephone interface circuit with a unique adaptive hybrid. These circuits are arranged so that they can be used together or independently in several different ways. The unit may be used to manually create the telephone to radio connection, or an unmanned connection can be made in the automated mode.

  • Page 46: Receiving A Telephone Call

    3.4.7.1 Initial Adaptation The two-wire to four-wire hybrid in the RTU-292 adapts to the phone line each time the TEL LINE/RADIO button is engaged. To adapt, it measures the characteristics of the line by placing a white noise source (built into the unit), on the line for a short time.

  • Page 47: Manual Phone Patch Procedure

    Because the adaptation algorithm is very robust, connection to an unquiet phone line is about the only case where the RTU-292 will fail to adapt, as the hybrid has the ability to adapt to line conditions from a short-circuit to an open-circuit, as well as the impedance presented by the extremely complex distributed network of a telephone line.

  • Page 48: Transmitter Keying, Half Duplex System

    (disconnected). 3.4.9 TRANSMITTER KEYING, HALF DUPLEX SYSTEM For a normal half-duplex radio link, it is usual for the VOX in the RTU-292 to key the transmitter. The VOX responds to signals from the telephone line and operates the keying circuits when voice is present.

  • Page 49: Transmitter Keying, Full Duplex System

    Thus, VOX is not required. In this case, the transmitter may be keyed from the RTU-292 by pulling either of its external KEY inputs low. The Full/Half Duplex dipswitch setting has no effect on transmitter keying.

  • Page 50: Table

    3.7.1.4 Radio Is Keyed (KEYED) When the RTU-292 wants to signal that the user has keyed the radio it will play 1 short high- pitched tone. The RTU-292 will play KEYED whenever the user has manually keyed the radio by entering the correct telephone command.
  • Page 51 3.7.1 are provided by the RTU-292 whether or not the Voice Prompt Option is installed. 3.7.3.1 The Caller Dials The RTU-292 When a call is made over the telephone line by a distant telephone to the RTU-292, the unit answers the phone and plays the greeting voice prompt: “RTU-292 Automatic Phone Patch”.

  • Page 52: Table

    3.7.4 PLACING A CALL IN THE COMMAND MODE: When a phone call is initiated by the RTU-292 to a distant phone on the outside line, and the called party picks up the phone, the unit's DSP will immediately execute the adaptation process.

  • Page 53: Dtmf Control Commands

    3. Pressing the OFF button on the front panel of the RTU-292 will also cause the system to disconnect.

  • Page 54: Table 3-1 Standard Dtmf Operational Commands

    RTU-292 Operations Manual Table 3-1 These commands may be entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. See 3.7.6 for special instructions regarding the use of the front panel keypad to send DTMF Commands.

  • Page 55: M Ode Dtmf C Ommands

    Table 3-2 These commands may be entered by the RTU-292 front panel keypad*, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. The unit must be put into the programming mode by entering *99 before these commands can be executed.

  • Page 56: Password Protection

    If no activity is detected for a time equal to the Inactivity Disconnect Timer setting, the RTU-292 will notify the users by three short beeps that they have five seconds to respond or the call will be terminated. If either the radio user or the PSTN caller initiates activity within 5 seconds of the warning beeps, the timer is reset.

  • Page 57: Using The Rtu-292 Speed Dial Feature

    6. The user may review the contents of the speed dial directory by entering the command “ 5”. 7. When programming is complete, enter the “* #” sequence to take the RTU-292 out of programming mode. 3.7.10.2 Using the Speed Dial Feature Operation is the same as standard, except when queried for a phone number by the RTU-292, the radio enters the speed dial location instead of the telephone number.

  • Page 58: Optional 4 Wire Operation

    I/O is handled by header J6 on the main PCB. The STU-III option makes use of this capability. To put the RTU-292, first place the unit in programming mode with the *99 command. Then enter the * 6 1 DTMF command. To return to 2 wire operation, enter * 6 0.

  • Page 59: Theory Of Operation

    4 RTU-292 Theory Of Operation 4.1 GENERAL This section gives enough detail of the theory of operation of the RTU-292 audio and power supply sections to allow them to be troubleshot in the field. The same level of detail is not supplied for the DSP module and the CPU portion as they are considered impractical to field troubleshoot because of the specialized knowledge and test equipment required.

  • Page 60: Telephone Interface Circuits

    The constant current load provides a means of sinking the DC holding current from the phone line so that the RTU-292 will seize and hold the line. Bridge CR1 corrects the DC polarity so that a positive voltage is always applied to the collector of Q1, eliminating the need to be concerned about the polarity of the phone line.

  • Page 61: Radio Interface Circuits

    This signal is fed to the DSP module on J14-28, where the DSP strips off the ring frequency and passes the a signal with the ring cadence alone on J14-7 to the ring tone generator circuit. Circuits U31 and U32 form a tone ringer to provide the audible ring signal for the RTU-292’s speaker.

  • Page 62: Handset/ Speaker Interface

    RTU-292 Operations Manual 4.3.3.4 DTMF Detector Circuit U25 is a DTMF detector/decoder dedicated to listening for DTMF signals from the radio. Its input is connected to the leveled radio receive signal at U20B-7. The DTMF data is read by the processor. A separate DTMF detector running in DSP software listens for DTMF from the telephone line.
  • Page 63 -292 Operations Manual 4.3.6.1 Adaptive Hybrid The adaptive hybrid is the central function of the RTU-292. Its purpose is to separate and isolate the telephone receive signal by subtracting the telephone send signal from the mixed telephone send and receive signals. If this subtraction is done perfectly, the telephone receive signal is completely isolated.

  • Page 64: Power Supply

    -12V adjustable by R212. 4.3.7.2 DC Power Supply The DC power supply allows the RTU-292 to be powered from either a +12V or +24V DC source as well as the standard AC supply line input. Slide switch S6 configures the supply for either +12V or +24/28V operation.

  • Page 65: Prompt Tone Generator

    4.5 VOICE PROMPT OPTION The Voice Prompt Option outputs prerecorded voice prompts into the telephone send signal or into the radio transmit audio output from the RTU-292. See figure 8-5. 4.5.1 SPEECH PROCESSOR The heart of the voice prompt option board is the speech processor chip, U7. This chip is an ADPCM (Adaptive Pulse Code Modulation) processor containing built-in A/D and D/A, and can be used for recording as well as playback.

  • Page 66: Voice Prompt Software

    The Local Phone Option allows a standard telephone set to be plugged into an RJ-11C modular jack at the rear of the RTU-292. This telephone set may then be used to place or receive calls via the RTU-292 to the PSTN or an associated radio. The Local Phone Option can also be used to control the RTU-292 remotely, changing various configuration options (see section 3.7).

  • Page 67: Remote Control Protocol

    (LF). Status information returned from the RTU-292 will always be preceded by a "%" character, and is also terminated by a CR. This protocol allows control and monitoring of the RTU-292 via a dumb terminal or a computer program. The commands issued to the RTU- 292 are not case sensitive.

  • Page 68: Table 5-1 Command Summary

    RTU-292 Operations Manual When a command is sent to the RTU-292 it is buffered up and acted on as soon as possible. Once the command has been executed, the RTU-292 will return a "Status" response. The format of this status response is explained in greater detail in the section 5.4, "Status Returned From The RTU-292".

  • Page 69: Null Command

    5.3.1 NULL Command <CR> This command may be used as a quick way to insure that RS-232 communication with the RTU-292 is functioning. The command has no parameters. Expected Response: NULL Response. Example: <CR> ; Command sent to the RTU-292.

  • Page 70: Date Command

    5.3.4 Date Command DATE <ddmmyy> <CR> This command is used to check or set the date on the RTU-292 internal clock. If no parameters are given the command simply returns the time/date. The parameter format is day (01-31), month (01-12), year (00-99).

  • Page 71: Disconnect Command

    Expected Response: DTMF Response. Examples: DTMF 1234 <CR> ; Command requesting the RTU-292 to generate DTMF for the digits 1 2 3 and %DTMF 1234 E0 <CR> ; Status returned indicating that DTMF for the number(s) 1234 was generated. DTMF 1234 <CR>...

  • Page 72: Handset Phone Command

    RTU-292 Operations Manual 5.3.8 Handset Phone Command HS_PH <ON|OFF|?> <CR> This command is to enable, disable or query the current status of Handset Phone Expected Response: Handset Phone Response. Examples: HS_PH ON <CR> ; Command to enable the Handset Phone path.

  • Page 73: Speaker Phone Command

    -292 Operations Manual 5.3.10 Speaker Phone Command SPKR_PH <ON|OFF|?> <CR> This command is to enable, disable or query the current status of the Speaker Phone path. Expected Response: Speaker Phone Response. Examples: SPKR_PH ON <CR> ; Command to enable the Speaker Phone path. %SPKR_PH ON E0 <CR>...

  • Page 74: Speed Dial Command

    RTU-292 Operations Manual 5.3.12 Speed Dial Command SD <nn|ALL> <num|.|?> <CR> This command is used to program or review data in speed dial memory. There are 99 locations in speed dial memory. These range from 1 to 99, with location 0 being used by the system as “scratch pad”...

  • Page 75: Tel-Line Phone Command

    This command is to enable, disable or query the current status of Tel-Line Radio. Note that enabling Tel-Line Radio will put the PSTN in an Off-Hook status and cause the DSP telephone hybrid to adapt. Disabling Tel-Line Radio will only put the PSTN back on hook if Tel-Line Phone is also disabled. To quickly disconnect the PSTN use the DISC command.

  • Page 76: Time Command

    5.3.15 Time Command TIME <hhmmss> <CR> This command is used to check or set the time on the RTU-292 internal clock. If no parameters are given the command simply returns the time/date. The parameter format is hour (00-23), minutes (00- 59), seconds (00-59).

  • Page 77: Table

    RTU-292 that was not directly due to a command being issued. In this case the RTU-292 simply volunteers this information without being asked for it. • Multi, the response may be given as a result of a command being issued to the RTU-292 or because of a change in the RTU-292 operating status.

  • Page 78: Null Response

    Asynchronous. Response To: Start of a Radio/Telephone call. This response indicates that a Radio/Telephone call has been started. The response shows the current time and date. The time is shown in 24-hour format. Note: the Call Logging Feature must be enabled before use.

  • Page 79: Dial Response

    5.4.5 Disconnect Response %DISC Exx <CR> Type: Multi. Response To: Disconnect Command, Telephone Command (*#) Disconnect, System Initiated Disconnect This response indicates that the PSTN, Operator, or Local Phone has been disconnected Examples: %DISC E0 <CR> ; Status returned indicating that the PSTN was disconnected.

  • Page 80: Elapsed Time Response

    The time is shown in 24-hour format. Note: the Call Logging Feature must be enabled before use. See 3.7.12. Examples: Status indicating that a radio/telephone call has finished and the call lasted for 1 hour, 12 minutes, 34 seconds. %Connection dropped, elapsed time: 01:12:34 E0 <CR>...

  • Page 81: Speaker Phone Response

    5.4.10 Speaker Phone Response %SPKR_PH <ON|OFF> Exx <CR> Type: Synchronous. Response To: Speaker Phone Command. This response indicates the Speaker Phone path status. Examples: %SPKR_PH ON E0 <CR> ; Status indicating that the Speaker Phone path is enabled. %SPKR_PH OFF E0 <CR> ; Status returned indicating that the Speaker Phone path is disabled. 5.4.11 Speaker Radio Response %SPKR_RAD <ON|OFF>...

  • Page 82: Speed Dial Response

    RTU-292 Operations Manual 5.4.12 Speed Dial Response %SD <nn> <num|”is empty.”> Exx <CR> Type: Synchronous. Response To: Speed Dial Command. This response shows the contents of a given speed dial memory location. Examples: %SD 5 5551212 E0 <CR> ; Status indicating that speed dial location 5 contains the number 555- 1212.

  • Page 83: Time/Date Response

    %VER a.bb Exx <CR> Type: Synchronous. Response To: Version Command. This response gives the RTU-292 firmware version data. The data is in the format "a.bb" where "a" is the major version (0-9), and "bb" is the minor version (00-99). Example: ^ VER <CR>...

  • Page 84: Code

    %CP_AUTO_ANSWERED Exx <CR>. 5.6 RESPONSE ERROR CODES All responses from the RTU-292 include an error code. This error code allows the user to see if there were any problems with a given command. Unless otherwise noted the user may assume that a non-zero error code indicates that the command was not acted upon.

  • Page 85: Maintenance And Repair

    6.5 PERFORMANCE TESTING This section describes how to test and verify the basic performance of the RTU-292. Extensive test procedures pin-pointing the location of internal faults to the component level are beyond the scope of this manual.

  • Page 86: Hybrid Balance Measurement

    RTU-292. This characteristic determines how much radio receiver input signal will leak into the transmitter output of the RTU-292. In the test set-up, the noise generator simulates the radio receiver, the audio voltmeter simulates the transmitter and the resistor simulates the telephone line.
  • Page 87 4. Adjust the TX Level Adjust, R133, so that the audio voltmeter reads -6dBm (0.387V rms). This sets the transmit signal output path in the RTU-292 for unity gain if the input level is correctly set.
  • Page 88 While this procedure cannot give a complete picture of the unit’s performance in actual use, it will allow a determination of whether or not the RTU-292 is operating properly. 1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown in Figure 6.1, except use an audio signal generator in place of the noise generator.

  • Page 89: Figure

    6.5.3 VOX SENSITIVITY MEASUREMENT The following test procedure measure the sensitivity of the VOX in the RTU-292. This is the amplitude of the incoming signal from the telephone line required to trigger the VOX. Figure 6-2 6.5.3.1 VOX Test Procedure 1.
  • Page 90 DC input. (If polarity is reversed, the unit will not be damaged, but will not operate. At power-up, the PEAK LED The RTU-292 has failed its self-test function. Check for proper seating of the flashes at a steady rate and the internal DSP module. Contact JPS Customer Service.
  • Page 91 Pot, 5K, lin, 1/4", panel mount 1940120086 Keypad, Molded Legend, 3 x 4 1946220001 Sw, lock toggle, DPDT, 6A, Silver 5962102000 DSP Module, Pcb Assembly 5930302800 Telephone Line Switch Assembly Part No. Description 320220250 Cap, elect, 22uF, 25VDC 327104101 Cap, mylar, 0.1uF, 10%, 100V 364010101 Conn, Header, .125bd, 10pin, retain...
  • Page 92 RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly Part No. Description 320010500 Cap, elect, 1uF, 50VDC 320020500 Cap, elect, 2.2uF, 50VDC 320100500 Cap, elect, 10uF, 50VDC 320101250 Cap, elect, 100uF, 25VDC 320101500 Cap, elect, 100uF, 50VDC 320102350 Cap, elect, 1000uF, 35VDC...
  • Page 93 5970506100 RTU-292 Main PCB Assembly (continued) Part No. Description 933074154 IC, dig, 74HC154N, 4:16 decoder 933074244 IC, dig, 74HC244N, 3-state driver 933074373 IC, dig, 74HC373N, octal d latch 933741390 IC, dig, 74HC139, 2-4 Decoder 935681101 IC, dig, 68HC11A0FN w/o EEPROM 936074742 IC, dig, 74ALS74N, Dual D FF, Adv.
  • Page 94 RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly (continued) Part No. Description 1820912000 Resistor, carb, 1/4w, 9100 ohm 1821102000 Resistor, carb, 1/2w, 1000 ohm 1826020000 Resistor, Varistor, RMS200V 1827400050 Resistor, ww, 5W, 40 ohm 1828759030 Resistor, pwr ox, 3W, 7.5 ohm...

  • Page 95: Table

    1. 7.1.1 Special Software Versions The options listed in the section may or may not be installable in an RTU-292 that has special software created by JPS to fit a non-standard application. If your RTU-292 has special software, consult JPS customer service before ordering options.

  • Page 96: Figure

    RTU-292 Operations Manual 7.2 VOICE PROMPT OPTION When the Voice Prompt Option is installed, the RTU-292 will send helpful prompts to system users to guide them in proper system operation and inform them of the current system status. The standard language is female English, though other languages and genders may be purchased, an additional fee to create the non-standard prompts is charged.

  • Page 97: Ption I Nstallation

    -292 Operations Manual Figure 7-1 Voice Prompt Option Installation JPS Communications, Inc.

  • Page 98: Local Phone Option

    This Local Phone set can make and receive calls via the outside line, communicate with an operator at the RTU-292, or send and receive audio through the companion radio. It can also be used to program the RTU-292. The Local Phone Option consists of a small Printed Circuit Board assembly that is installed in the RTU-292 options tray.

  • Page 99: Local Phone Option Operation

    PSTN caller in the command mode (see Table 3-1). It is important to note that the local phone audio into the RTU-292 does not run through the unit's DSP circuitry and therefore cannot activate the VOX function.

  • Page 100: Vmm-100 Option

    RTU-292 Operations Manual 7.4 VMM-100 OPTION The VMM-100 VMR Module implements Voice Modulation Recognition (VMR) which enables the receive audio path when speech is present and disables it when speech is not present. This module also implements a form of noise reduction known as "dynamic peaking"...

  • Page 101: Table

    -292 Operations Manual 7.4.2 VMM-100 Software The VMM-100 DSP software can provide voice modulation recognition, noise reduction, or both. The module's operating mode is set by logic inputs at P9 pins 3 and 4 7.4.2.1 VMR Algorithm The VMR algorithm works by passing the audio through a series of bandpass filters that are spaced throughout the speech frequency spectrum.

  • Page 102: Figure

    RTU-292 Operations Manual The dipswitches on the VMM-100 module may be changed at any time during operation; the DSP is constantly checking the states of these switches. The VMR and Noise Reduction modes can be used individually or simultaneously. They are toggled off & on via standard DTMF Operational Commands.

  • Page 103: Table

    Table 7-6 GENERAL Frequency Response Input Level Input Impedance DSP Output Delay Noise Reduction Type Noise Reduction Audio Output Audio Output Distortion VMR Performance VMR Output Delay VMR Hang Time Indicators Size Power Requirements ENVIRONMENTAL Operating Temperature Storage Temperature Humidity Shock Vibration Altitude...

  • Page 104: Vmm-100 I/O Connector Information (P9)

    RTU-292 Operations Manual Table 7-7 VMM-100 I/O CONNECTOR INFORMATION (P9) Signal Audio Input (see specs above) Audio Output (see specs above) NR1; Logic Input; Low selects DSP Noise Reduction NR2; Logic Input; Low selects DSP Voice Modulation Recognition -5V; Supply Input (see specs above) +5V;...

  • Page 105: Rtu-292 Places The Call

    If no DTMF is detected at the RTU-292, the unit will place a call to the telephone at the speed dial location #01. This is an “auto-call”.

  • Page 106: After The Call Begins

    DTMF commands from Table 3-1. The Inactivity Timer will now begin to run. If this time expires (due to a lack of speech or other audio activity), the RTU-292 will give a series of 3 short beeps as a warning. The radio caller or the phone user may initiate activity within 5 seconds of the warning beeps to reset the timer.

  • Page 107: Squelch Break Access Option

    The RTU-292 then informs the radio user that the call is being placed. information that is provided when placing a call via the RTU-292 front panel keypad or Local Phone is not sent over the air due to FCC regulations. The RTU-292 adapts to the phone line while placing the call.

  • Page 108: The Call Logging Option

    The phone user may enter * # to hang up. 7.7 THE CALL LOGGING OPTION The RTU-292 contains a Real Time Clock (RTC) IC that allows the logging outgoing telephone calls via the unit’s RS-232 serial communications port. Full information regarding the use of this port is provided in section 5.

  • Page 109: Radio Control Option

    200 radio connected to the unit via the RS-232 serial port. The control commands may be entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. To use front panel keypad control, the LINE- PHONE and LINE-RADIO pushbuttons must both be off.

  • Page 110: Table

    "#" character in place of the “Followed By” data to query the radio for its current setting. For example, if the sequence "* 0 1" is entered, the RTU-292 will command to the radio to select channel 1. However if the sequence "* 0 #" is entered, the RTU-292 will play back the current channel number.

  • Page 111: Ption B Oard

    RTU-300 (desktop version), and the RTU-285 (special application version- not for general sale). There are two different power supply schematics. On the eighth page is the schematic for the power supply configuration used with the RTU-292 or RTU-300. The ninth page is the power supply configuration for the RTU-285 only.
  • Page 112 RTU-292 Operations Manual Blank Page JPS Communications, Inc.

  • Page 113: Index

    Call Logging... 7-14 CALL PROGRESS RESPONSES FROM THE RTU-292 ... 5-18 Call Starting Response ... 5-12 CALLING THE RTU-292 VIA THE OUTSIDE LINE .. 3- CALLING TIMER... 3-16 Chassis Assembly... 6-7 Checking The Time And Date... 7-14 Command Summary ...5-2 COMMANDS SENT TO THE RTU-292 ...
  • Page 114 RTU-292 Operations Manual DTMF Detector... 4-22, 4-23 DTMF Generator... 4-23 DTMF Radio Control Commands...7-16 DTMF Response ... 5-13 dynamic peaking ... 7-6 EIA ...9 Elapsed Time Response ... 5-14 Enters the COMMAND Mode ... 3-12 Enters The Password ... 3-11 ENVIRONMENTAL...
  • Page 115 Negative Acknowledge (ERROR)... 3-9 Noise Generator ... 4-23 noise reduction ... 7-6 NULL Command... 5-3 NULL Response... 5-12 OPERATING THE RTU-292 FROM THE FRONT PANEL KEYPAD ... 3-13 Operation... 3-1 OPERATION ...3-5, 7-2 OPERATION OVERVIEW ... 3-5 OPTION INTERFACE BOARD ... 4-25 Option Setting Details ...
  • Page 116 TEST EQUIPMENT REQUIRED ... 6-1 The Caller Dials The RTU-292 ... 3-11 The Caller Enters The Password (if enabled ... 3-11 The RTU-292 Adapts To The Phone Line ... 3-11 The RTU-292 Enters the COMMAND Mode... 3-12 JPS Communications, Inc.

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