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JPS RTU-292C Installation And Operation Manual

Radio / telephone interface unit
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Installation and Operation Manual
RTU-292C
RADIO / TELEPHONE
INTERFACE UNIT
Designed and Manufactured by:
JPS Interoperability Solutions, Inc.
jpsinterop.com
5800 Departure Drive
Raleigh, NC 27616
phone: (919) 790-1011
email:
sales@jpsinterop.com
/
support@jpsinterop.com
This Manual is P/N 5020-500200
Revision 4
June 2018
1

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  • Page 1 Installation and Operation Manual RTU-292C RADIO / TELEPHONE INTERFACE UNIT Designed and Manufactured by: JPS Interoperability Solutions, Inc. jpsinterop.com 5800 Departure Drive Raleigh, NC 27616 phone: (919) 790-1011 email: sales@jpsinterop.com support@jpsinterop.com This Manual is P/N 5020-500200 Revision 4 June 2018...
  • Page 2 PROPRIETARY STATEMENT The information contained in this manual is the property of JPS Interoperability Solutions and is intended for the purchaser’s use only. It may not be reproduced without the expressed written consent of JPS Interoperability Solutions, Inc.
  • Page 3 RTU-292C Operations Manual Content Table Sample (Hazardous substances present) 有毒有害物质或元素 (Hazardous Substance) 部件名称 铅 镉 汞 六价铬 多溴联苯 多溴二苯醚 (Parts) (Pb) (Hg) (Cd) (PBB) (PBDE) 金属部件 ○ ○ ○ ○ (Metal Parts) 电路模块 ○ ○ ○ ○ ○ Circuit Modules) 电缆及电缆组件...
  • Page 4 RTU-292C Operations Manual Blank Page...

  • Page 5: Table Of Contents

    2.7.1 LINE VOLTAGE SELECTION ..................... 2-5 2.7.2 DC INPUT POWER SELECTION ....................2-5 2.7.3 FUSE INFORMATION ........................2-5 CONFIGURING THE RTU-292C ......................2-6 2.8.1 PROGRAMMING MODE SETUP PARAMETERS ..............2-6 2.8.2 SETTING TELEPHONE SEND AND RECEIVE LEVELS ............2-6 2.8.3 VOX HANGTIME ..........................
  • Page 6 3.3.5 DC INPUT TERMINAL BLOCK ....................3-4 OPERATION ............................3-4 3.4.1 OPERATION OVERVIEW ......................3-4 3.4.2 USE OF THE RTU-292C SPEAKER TO MONITOR AUDIO............3-4 3.4.3 PLACING A TELEPHONE CALL....................3-4 3.4.4 RECEIVING A TELEPHONE CALL .................... 3-5 3.4.5 PUTTING A TELEPHONE CALL ON HOLD ................3-5 3.4.6...
  • Page 7 Tel-Line Radio Response ......................4-16 4.4.15 Time/Date Response ........................4-17 4.4.16 Version Response .......................... 4-17 CALL PROGRESS RESPONSES FROM THE RTU-292C ..............4-18 RESPONSE ERROR CODES ......................4-18 MAINTENANCE AND REPAIR ........................ 5-1 GENERAL .............................. 5-1 PREVENTIVE MAINTENANCE ......................5-1 REPAIR OR REPLACEMENT ......................
  • Page 8 RTU-292C Operations Manual 6.3.3 Radio Caller Provides Calling Directions ..................6-4 6.3.4 RTU-292C Plays Back Phone Number & Prompts for Confirmation ..........6-4 6.3.5 RTU-292C Places the Call ......................6-4 6.3.6 After the Call Begins ........................6-4 SQUELCH BREAK ACCESS OPTION ....................6-5 6.4.1...
  • Page 9 RTU-292C Operations Manual List Of Figures ........................2-17 IGURE UTLINE IMENSIONS ..................2-18 IGURE ONTROL AND ONNECTOR OCATIONS ................... 2-19 IGURE OCATION OF NTERNAL PTION ETTINGS ................... 2-20 IGURE NTERNAL PTION ETTINGS ETAILS ................... 2-21 IGURE UDIO NTERFACE IRING IAGRAM ........................
  • Page 10 RTU-292C Operations Manual List of Tables ........................2-17 IGURE UTLINE IMENSIONS ..................2-18 IGURE ONTROL AND ONNECTOR OCATIONS ................... 2-19 IGURE OCATION OF NTERNAL PTION ETTINGS ................... 2-20 IGURE NTERNAL PTION ETTINGS ETAILS .................... 2-21 IGURE UDIO NTERFACE IRING IAGRAM ........................
  • Page 11 Glossary Adaptation The process whereby the RTU-292C 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 12 RTU-292C Operations Manual This page intentionally left blank.

  • Page 13: General Information

    First, a radio-to-radio link is established. Then, using the telephone in the RTU-292C, 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 14: Assemblies

    RTU-292C Operations Manual telephone set to be plugged into the rear panel of the RTU-292C; this local phone may then be used in place of the unit's keypad and handset. Input and output levels are internally adjustable to accommodate all types of radio systems. A set-up mode allows the adjustment of the RTU-292C receiver and transmitter signal levels without any external test equipment.

  • Page 15: Front Panel Switch Assemblies

    This section contains the microprocessor and program software that controls all operations of the RTU-292C. Various I/O devices read external inputs and the front panel controls. The inputs are processed and audio gates, front panel LEDs, audio prompts, etc., are controlled accordingly.
  • Page 16 RTU-292C Operations Manual Table 1-1 Equipment and Accessories Supplied Part Number Item 5020-500000 RTU-292C Standard 5020-500200 Operation & Maintenance Manual [this document] 5020 500150 Accessory Kit Accessory Kit Consists of: Part Number Item 0150-200000 Handset, PTT, Black, with coiled cord...

  • Page 17: Options

    RTU-292C Operations Manual 1.3.4 OPTIONS RTU-292C options include the: The Voice Prompt Option, which gives verbal prompts to the user as an aid in all aspects of unit operation as well as various Software Options. Several different levels of spares kits are also available.
  • Page 18 RTU-292C Operations Manual Table 1-3 RTU-292C Specifications TELEPHONE LINE INTERFACE (J1, RJ-11 Connector) Output & Input Levels to Phone Line Nominally -12 dBm. (Adjustable -21 to 0 dBm in 3 dB steps). Frequency Response +2 dB, 300 to 3200 Hz.

  • Page 19: Installation

    RTU-292C Operations Manual 2 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 20: Installation Overview

    SAFETY NOTE Safety Disconnect Devices Information: • If the RTU-292C is connected to a battery backup, there should be an approved disconnect device installed in the DC wiring in an easily accessible location. • If the RTU-292C is being operated from a power source other than the external supply provided, there should be an approved disconnect device installed in the DC wiring in an easily accessible location.

  • Page 21: Installation Considerations

    Careful attention to the following installation suggestions should result in the best unit/system performance. Figure 2-1 provides overall unit dimensions. The RTU-292C 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 splash proof nor corrosion resistant, it must be protected from exposure to salt spray.
  • Page 22 RTU-292C Operations Manual Table 2-1 RTU-292C Factory Default Settings This table describes the settings of all RTU-292C internal adjustments and switch positions as set when the unit is shipped. Feature / Function Adjustment Default Setting Telephone Send and Receive Levels...

  • Page 23: Power Requirements

    2.7.3 FUSE INFORMATION Three fuses are used in the RTU-292C. F2 fuses the DC input and is located on the inside of the rear panel. It can only be accessed with the top cover removed. F3 and F4 fuse the telephone line input;...

  • Page 24: Configuring The Rtu-292C

    The levels of the audio signal that are sent into (Send) and received from (Receive) the telephone line are adjustable via SW2 switches 1 through 3 on the RTU-292C Main Board. The levels are adjustable from -21 dBm (600 Ohm) to 0 dBm in 3 dB steps. The dipswitches simultaneously set the Send and Receive levels.

  • Page 25: Vox Hangtime

    Factory default settings are indicated by an asterisk * 2.8.3 VOX HANGTIME The RTU-292C 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.

  • Page 26: Vox Sensitivity

    RTU-292C Operations Manual 2.8.4 VOX SENSITIVITY The RTU-292C VOX circuitry has four sensitivity levels: minimum, low, medium (factory setting), and maximum. A higher setting will be more able to detect weak or noisy voice signals, but will be more likely to false on ambient noise entering the telephone handset. A lower setting will do the opposite.

  • Page 27: Dial Mode

    The dialing mode of the RTU-292C’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-292C is interfaced with a touch-tone (DTMF) capable telephone line. Note that, even when set for pulse dialing, the RTU-292C can still send DTMF tones onto the phone line to control automated systems such as voice mail.

  • Page 28: Radio Control Mode

    9600 * 2.8.11 RADIO CONTROL MODE Dipswitch SW1-3 enables the RTU-292C to be put into the Radio Control Mode via one of its DTMF commands. In this mode the RTU-292C 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 29: Local Phone / Local Phone Ring-Through

    SW1-8 enables the Local Phone Ring-Through feature. This causes the local phone to ring whenever a call is received by the RTU-292C 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 30: Transmit Level Set-Up Mode

    RTU-292C Operations Manual 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 2.10for instructions. This switch must remain Off (Normal Mode) for standard operation. Table 2-15 TX Level Set-up Mode...

  • Page 31: Radio Connection

    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-292C 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 32: Connection

    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-292C when in the Transmit Level Set-Up Mode, or (B) simply speak into the telephone line to supply typical audio to the RTU- 292C.

  • Page 33: Setting The Receive Level

    OFF, and turning the power back on. 2.10.2 SETTING THE RECEIVE LEVEL The audio level into the RTU-292C 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 34 NOTE The proper operation and excellent performance of the RTU-292C will not be obtained if the audio level from the receiver into the RTU-292C is not set correctly. Excessive audio will overload the telephone line and equipment, causing distortion, VOX falsing and poor hybrid operation. In addition, the telephone company may cut off a call in progress, which contains audio high enough to bleed over into other circuits.

  • Page 35: Figure 2-1 Outline Dimensions

    RTU-292C Operations Manual Figure 2-1 Outline Dimensions 2-17...

  • Page 36: Figure 2-2 Control And Connector Locations

    RTU-292C Operations Manual Figure 2-2 Control and Connector Locations 2-18...

  • Page 37: Figure 2-3 Location Of Internal Option Settings

    RTU-292C Operations Manual Figure 2-3 Location of Internal Option Settings 2-19...

  • Page 38: Figure 2-4 Internal Option Settings Details

    RTU-292C Operations Manual Figure 2-4 Internal Option Settings Details 2-20...

  • Page 39: Figure 2-5 Audio Interface Wiring Diagram

    RTU-292C Operations Manual Figure 2-5 Audio Interface Wiring Diagram 2-21...

  • Page 40: Figure 2-6 Interface Details

    RTU-292C Operations Manual Figure 2-6 Interface Details 2-22...

  • Page 41: Installation Checklist

    See Section 6 for installation instructions for all field-installable options. Section 6 also explains how to set-up any options that have configuration switches, jumpers, potentiometers, etc. For any options not covered in Section 6, refer to custom notes supplied with the RTU-292C or the option, or contact us for information.
  • Page 42 RTU-292C Operations Manual Blank Page 2-24...

  • Page 43: 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-292C's accessory kit, may also be installed elsewhere on the equipment rack.

  • Page 44: Speaker Volume Control

    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-292C internal telephone to the telephone line and allows dialing using the keypad. Pushing this button will also answer an incoming telephone call.

  • Page 45: Tel Vox

    RS-232 connector, and the DIN plug for connecting the external AC power supply. 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-292C. It contains transmit audio, receive audio, and keylines.

  • Page 46: J1 Tel Line

    [This option no longer available.] 3.3.4 P2 RS-232 CONNECTOR This female DB-9 connector provides an interface between the RTU-292C and a radio or a controlling terminal via standard RS-232 signal lines. 3.3.5 DC INPUT TERMINAL BLOCK This two-position terminal strip has a pair of screw terminals, one for a ground wire and another for the DC input of either +12 or +24/+28VDC (nominal).

  • Page 47: Receiving A Telephone Call

    RTU-292C Operations Manual 2. Connect the RTU-292C to the outside phone line by pressing the TEL LINE/PHONE button; listen for the dial tone. 3. When dial tone is heard, dial the desired number using the keypad. The handset will function like an ordinary telephone handset.

  • Page 48: 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-292C 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 49: 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-292C to key the transmitter. The VOX responds to signals from the telephone line and operates the keying circuits when voice is present.

  • Page 50: Transmitter Keying, Full Duplex System

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

  • Page 51: Voice Prompts

    3.7.1.4 Radio Is Keyed (KEYED) When the RTU-292C wants to signal that the user has keyed the radio it will play 1 short high- pitched tone. The RTU-292C will play KEYED whenever the user has manually keyed the radio by entering the correct telephone command.
  • Page 52 Section 3.7.1are provided by the RTU-292C whether the Voice Prompt Option is installed. 3.7.3.1 The Caller Dials The RTU-292C When a call is made over the telephone line by a distant telephone to the RTU-292C, the unit answers the phone and plays the greeting voice prompt: “RTU-292C Automatic Phone Patch”.

  • Page 53: Placing A Call In The Command Mode

    ” voice prompt. Invalid Entry When the RTU-292C is used in the command mode, it is connected to a radio system that is ready to respond to the basic RTU-292C commands. At a minimum, the radio must be turned on and set to the appropriate frequencies, and the radio audio and PTT input lines must be connected to the RTU-292C.

  • Page 54: Dtmf Control Commands

    3. Pressing the OFF button on the front panel of the RTU-292C will also cause the system to disconnect.
  • Page 55 Table 3-1 Standard DTMF Operational Commands These commands may be entered by the RTU-292C front panel keypad, or by the keypad of a connected telephone. See 3.7.6 for special instructions regarding the use of the front panel keypad to send DTMF Commands.
  • Page 56 Table 3-2 Programming Mode DTMF Commands These commands may be entered by the RTU-292C front panel keypad, or by the keypad of a connected telephone. The unit must be put into the programming mode by entering *99 before these commands can be executed. See Section 3.7.6 for special instructions regarding the use of the RTU-292C keypad.

  • Page 57: Rtu-292C Password Protection

    The Calling Timer determines how long the RTU-292C will attempt to place a telephone call. Once the timer expires, the RTU-292C terminates the attempt. Note that if the unit detects a busy signal or other feedback that indicates that the call cannot be placed, the attempt will be immediately terminated.

  • Page 58: Using The Rtu-292C Speed Dial Feature

    5. The user enters the digits of the phone number. When complete the user enters a “#”. 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-292C out of programming mode. 3-16...
  • Page 59 • Dial the DTMF character “*” (star) • Dial the DTMF characters 6 and 7 When the RTU-292C retrieves a STAR character from speed dial, it does not dial this character, instead, it’s a signal that the subsequent character is a special dialing command.

  • Page 60: Special Dialing Features

    #99 (see 3.7.10.4). When the RTU-292C is set or reset to factory defaults, both features are disabled. Dial tone is required before the RTU-292C will attempt to dial a number, and there is no automatic dialing when power is applied.

  • Page 61: Remote Control Protocol

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

  • Page 62: Null Command

    Get the firmware revision number: VER <CR> When a command is sent to the RTU-292C it is buffered up and acted on as soon as possible. Once the command has been executed, the RTU-292C will return a "Status" response. The format of this status response is explained in greater detail in Section 4.4, "Status Returned from...
  • Page 63 RTU-292C Operations Manual 4.3.1 NULL Command <CR> This command may be used as a quick way to insure that RS-232 communication with the RTU-292C is functioning. The command has no parameters. Expected Response: NULL Response. Example: <CR> ; Command sent to the RTU-292C.

  • Page 64: Date Command

    4.3.4 Date Command DATE <ddmmyy> <CR> This command is used to check or set the date on the RTU-292C 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 65: Disconnect Command

    Expected Response: DTMF Response. Examples: DTMF 1234 <CR> ; Command requesting the RTU-292C to generate DTMF for the digits 1 2 3 and 4. %DTMF 1234 E0 <CR> ; Status returned indicating that DTMF for the number(s) 1234 was generated.

  • Page 66: Handset Phone Command

    RTU-292C Operations Manual 4.3.8 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 67: Speaker Phone Command

    RTU-292C Operations Manual 4.3.10 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.

  • Page 68: Speed Dial Command

    RTU-292C Operations Manual 4.3.12 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 69: Tel-Line Phone Command

    RTU-292C Operations Manual 4.3.13 Tel-Line Phone Command TEL_LINE_PH <ON|OFF|?> <CR> This command is to enable, disable or query the current status of Tel-Line Phone. Note that enabling Tel-Line Phone will put the PSTN in an Off-Hook status. Disabling Tel-Line Phone will only put the PSTN back on hook if Tel-Line Radio is also disabled.

  • Page 70: Time Command

    4.3.15 Time Command TIME <hhmmss> <CR> This command is used to check or set the time on the RTU-292C 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 71: Status Returned From The Rtu-292C

    292C that was not directly due to a command being issued. In this case the RTU-292C 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-292C or because of a change in the RTU-292C operating status.

  • Page 72: Null Response

    Response To: NULL Command. This response is given after receiving a NULL command. No data is returned in the response. Example: <CR> ; Command sent to the RTU-292C. % E0 <CR> ; Status returned from the RTU-292C. 4.4.2 Auto Answer Response %AUTO_ANS <ON|OFF>...

  • Page 73: Dial Response

    RTU-292C Operations Manual 4.4.4 Dial Response %DIAL <OPER|LP|number string> Exx <CR> Type: Synchronous. Response To: Dial Command. This response indicates that the given number was dialed. Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to produce a 2 second pause while dialing.

  • Page 74: Elapsed Time Response

    RTU-292C Operations Manual 4.4.7 Elapsed Time Response %Connection dropped, elapsed time: hh:mm:ss Exx <CR> Type: Asynchronous. Response To: Completion of a Radio/Telephone call. This response indicates that a Radio/Telephone call has been terminated. The response shows the elapsed time of the call. The time is shown in 24-hour format. Note: the Call Logging Feature must be enabled before use.

  • Page 75: Speaker Phone Response

    RTU-292C Operations Manual 4.4.10 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.

  • Page 76: Speed Dial Response

    RTU-292C Operations Manual 4.4.12 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 77: Time/Date Response

    %VER a.bb Exx <CR> Type: Synchronous. Response To: Version Command. This response gives the RTU-292C 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 78: Call Progress Responses From The Rtu-292C

    The RTU-292C has answered an incoming PSTN call 4.6 RESPONSE ERROR CODES All responses from the RTU-292C 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 79: Maintenance And Repair

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

  • Page 80: Hybrid Balance Measurement

    RTU-292C. This characteristic determines how much radio receiver input signal will leak into the transmitter output of the RTU-292C. 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 81: Figure 5-1 Hybrid Balance Test Set-Up

    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-292C for unity gain if the input level is correctly set. 5. Adjust the RX Level Adjust, R116, so that the PEAK LED flashes rapidly and is on about 50% of the time.
  • Page 82 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-292C is operating properly. 1. Disconnect the RTU-292C from all other equipment and connect the test equipment as shown in Figure 5-1, except use an audio signal generator in place of the noise generator.

  • Page 83: Vox Sensitivity Measurement

    RTU-292C Operations Manual 5.5.3 VOX SENSITIVITY MEASUREMENT The following test procedure measure the sensitivity of the VOX in the RTU-292C. This is the amplitude of the incoming signal from the telephone line required to trigger the VOX. Figure 5-2 VOX Sensitivity Test Set-Up 5.5.3.1 VOX Test Procedure...
  • Page 84 DC input. (If polarity is reversed, the unit will not be damaged, but will not operate. At power-up, the PEAK LED The RTU-292C has failed its self-test function. Check for proper seating of the flashes at a steady rate and the internal DSP module. Contact Customer Service.
  • Page 85 RTU-292C Operations Manual Table 5-2 Replaceable Parts List Does not include items from accessory kit 5970501000 Chassis Assembly Part No. Description Reference Designator 153080001 Speaker, 8 ohm, 3" sq 360040001 Conn, MTA-156, 4-pin, receptacle 362005180 Conn, circular, pnl mt receptacle (DC Input)
  • Page 86 RTU-292C Operations Manual 5970506100 RTU-292C Main PCB Assembly Part No. Description Reference Designator 320010500 Cap, elect, 1uF, 50VDC C103 320020500 Cap, elect, 2.2uF, 50VDC C3,29,35,125 320100500 Cap, elect, 10uF, 50VDC 320101250 Cap, elect, 100uF, 25VDC C21,33,42,80,124,126 320101500 Cap, elect, 100uF, 50VDC...
  • Page 87 RTU-292C Operations Manual 5970506100 RTU-292C Main PCB Assembly (continued) Part No. Description Reference Designator 933074154 IC, dig, 74HC154N, 4:16 decoder U43,44 933074244 IC, dig, 74HC244N, 3-state driver U54-57,60,61 933074373 IC, dig, 74HC373N, octal d latch U39,58 933741390 IC, dig, 74HC139, 2-4 Decoder...
  • Page 88 RTU-292C Operations Manual 5970506100 RTU-292C Main PCB Assembly (continued) Part No. Description Reference Designator 1820682000 Resistor, carb, 1/4w, 6800 ohm R22,54 1820912000 Resistor, carb, 1/4w, 9100 ohm R3,5,28,29 1821102000 Resistor, carb, 1/2w, 1000 ohm R207 1826020000 Resistor, Varistor, RMS200V 1827400050...

  • Page 89: Rtu-292C Options

    Spares kits and the 19” Rack Mount Kit are listed in Section 6.1.1 Special Software Versions The options listed in the section may or may not be installable in an RTU-292C that has special software created by us to fit a non-standard application. If your RTU-292C has special software, consult customer service before ordering options.

  • Page 90: Voice Prompt Option

    RTU-292C Operations Manual 6.2 VOICE PROMPT OPTION When the Voice Prompt Option is installed, the RTU-292C 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 91: Dtmf Access Option

    This option allows a radio user to use his DTMF keypad to quickly place a telephone call via the RTU-292C. If the user does not have DTMF capability, the Squelch Break Access Option allows the use a series of squelch breaks to automatically connect to the telephone at speed dial location #01 (see next section).

  • Page 92: Initiate Call Via Attention Signal

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

  • Page 93: Squelch Break Access Option

    6.4.1 Initiate Call Via Attention Signal The radio user sends the “Attention” signal to the RTU-292C. This is a series of 3 squelch breaks that occur within 4 seconds window.

  • Page 94: The Call Logging Option

    200 radio connected to the unit via the RS-232 serial port. The control commands may be entered by the RTU-292C front panel keypad, or by the keypad of a connected. To use front panel keypad control, the LINE-PHONE and LINE-RADIO pushbuttons must both be off. See Section 6.6.1...

  • Page 95: Controlling The Radio Via The Rtu-292C Front Panel Keypad

    • The user enters a "*#" sequence. • There is no PTT activity and no keypad activity for the duration of the activity timer. While the operator is using the keypad to control the RTU-292C, the unit will not be available for: •...
  • Page 96 "#" 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-292C will command to the radio to select channel 1. However if the sequence "* 0 #" is entered, the RTU-292C will play back the current channel number.

  • Page 97: Index

    RTU-292C Operations Manual 7 Index CALLING THE RTU-292 VIA THE OUTSIDE LINE 3-9 CALLING TIMER ............3-15 Chassis Assembly ............5-7 Checking The Time And Date ........6-6 * #............... 3-13, 3-15 Command Summary ..........4-2 * 0................3-13 COMMANDS SENT TO THE RTU-292 ..... 4-1 * 0 x ................
  • Page 98 RTU-292C Operations Manual Factory Default Settings ..........2-4 J1 .................. 1-6 FACTORY RESET ............3-18 J1 TEL LINE ..............3-4 Fault Analysis ............... 5-6 J2 .................. 1-6 four wire ...............3-14 J2 LOCAL PHONE CONNECTOR ......3-4 four wire operation ............3-14 JUMPERS ..............2-12 FRONT PANEL CONTROLS, INDICATORS AND CONNECTORS ............
  • Page 99 RTU-292C Operations Manual Outline Dimensions ............. 2-17 SELF TEST ..............3-8 Send/Receive Levels ..........2-7 SERIAL PORT BAUD RATE ........2-9 P1 RADIO CONNECTOR ..........3-3 SETTING TELEPHONE SEND AND RECEIVE P2 RS-232 CONNECTOR ........... 3-4 LEVELS ..............2-6 PASSWORD PROTECTION ......2-10, 3-15 Setting The Date ............
  • Page 100 RTU-292C Operations Manual TONE PROMPTS ............3-8 TRANSMIT LEVEL SET-UP MODE ......2-12 TRANSMITTER KEYING, FULL DUPLEX SYSTEM 3- Version Response ............4-17 VOICE PROMPT OPTION .......... 6-2 TRANSMITTER KEYING, HALF DUPLEX SYSTEM 3- Voice Prompt Option Installation ........ 6-3 VOICE PROMPTS ..........2-10, 3-9 TX ...................

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