FCC ID: E5MDS-LCT450 Tri-Mode Data Transceiver

MDS LCT 450 Tri-Mode Data Transceiver i e d u G n o i t a r e p O

n o i t a l l a t s n I Supporting Phase 1 Units MDS 05-4819A01, Rev. 08 MAY 2010 OPERATIONAL & SAFETY NOTICES RF Exposure Concentrated energy from a directional antenna may pose a health hazard to humans. Do not allow people to come closer to the antenna than the distances listed in the table below when the transmitter is operating. More information on RF exposure can be found online at the following website:

www.fcc.gov/oet/info/documents/bulletins

. Antenna Gain vs. Recommended Safety Distance Device complies with Power Density requirements at 20 cm separation: No Required separation distance for 5 dBi antenna (in meters):

Required separation distance for 10 dBi antenna (in meters):

Required separation distance for 16.5 dBi antenna (in meters):

1.6 2.8 6.0 Above data based on a 30-watt RF output level with a 100% duty cycle. FCC Part 15 Notice The transceiver is approved under Part 15 of the FCC Rules. Operation is subject to the fol-

lowing two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired opera-

tion. Any unauthorized modification or changes to this device without the express approval of Microwave Data Systems may void the users authority to operate this device. Furthermore, this device is intended to be used only when installed in accordance with the instructions out-

lined in this manual. Failure to comply with these instructions may void the users authority to operate this device. INTRODUCTION This guide presents installation and operating instructions for the MDS LCT 450 Series wireless transceiver. The transceiver (Figure 1) is designed to operate in Railroad Distrib-

uted Power applications. It is software-configurable to provide flex-

ible operation in a variety of applications using one hardware platform. It employs microprocessor control and Digital Signal Pro-

cessing (DSP) technology to provide robust communications even under adverse conditions. Figure 1. Data Transceiver NOTE:

Some features may not be available on all units, based on the options purchased and the applicable regulatory constraints for the region in which the radio will operate. Front Panel Connectors Figure 2 and Figure 3 show the interface connectors and indicators on the transceivers front and rear panels. These items are referenced in the installation steps given later in this guide. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 1 Antenna Connector

(UHF) Invisible place holder Power Connector:

Tyco/AMP Electronics 172129-1 DC Power Input 13.6 Vdc +/-15%

Figure 2. Antenna & DC Power Connectors Invisible place holder LED Indicator Panel PWR DCD TXD RXD P2 Programming & Diagnostic

(DB-9) P1 Control Interface Connect

(DB-25) Figure 3. Data Interface Connectors & LED Status Panel 2 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 INSTALLATION There are three main requirements for installing the transceiver as fol-

lows:

Adequate and stable primary power An efficient and properly installed antenna system Correct data connections between the transceiver and the data equipment. Figure 4 shows a typical station arrangement. This is followed by step-by-step procedures for installing the transceiver and making front and rear panel connections. LOW-LOSS COAXIAL CABLE

(50 Ohm) INTEGRATED PROCESSING MODULE (IPM) ANTENNA SYSTEM DB-25M CONNECTOR Antenna Connector RADIO TRANSCEIVER PL-259 UHF CONNECTOR DC POWER CABLE Negative Ground 13.6 Vdc +/-15%

Figure 4. Typical Station Arrangement 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 3 Installation Steps Below are the basic steps for installing the transceiver. Refer to Figure 4 as necessary when making cable connections. 1. Mount the transceiver to a stable surface bracket provided. Begin by attaching the radios mounting bracket to the bottom of the transceiver case (if not already attached) using the four 6-32 x 1/4 inch (6 mm) screws supplied. Figure 5 shows the transceiver mounting dimensions with bracket attached. using the U-shaped NOTE:

To prevent moisture from entering the radio, do not mount the case with the cable connectors pointing up. Also, dress all cables to prevent moisture from running along the cables and into the radio. Invisible place holder

6 8

. 6 m m 4 2

. 4 7 1

5 2

. 3 m m 3 8 U-Shaped Bracket

(Part No. 821753A14) 7.00"

177.80 mm 5.63"

143 mm

0 2

. m m 1 5 Figure 5. Transceiver Mounting Bracket Dimensions 4 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 CAUTION POSSIBLE EQUIPMENT Using screws longer than 1/4 inch (6 mm) to attach the bracket to the radio may damage the internal PC board. Use only the supplied screws. for the station. The antenna DAMAGE Install the antenna and feedline used with the transceiver must be designed to operate in the radios frequency band, and be mounted in a location that pro-

vides a clear path to the other associated station(s). Use low loss coaxial feedline and keep the cable as short as possible. Connect the data equipment DATA INTERFACE tor. Check P1 CONTROL INTERFACE on Page 24 for pin wiring details. connec-

to the 2. 3. NOTE:

The radios port is used for entering configuration commands and reprogramming the radios firmware. P2 4. Connect primary power to the transceiver. be 13.6 Vdc (+/- 15%) and capable of providing at least 8 Amperes of continuous current. A power connector with is pro-

vided with each unit (see Figure 4). Power applied must CAUTION POSSIBLE EQUIPMENT DAMAGE The transceiver is designed for use with nega-

tive-ground systems only. The power supply should be equipped with overload protection (NEC Class 2 rating), to protect against a short circuit between its output ter-

minals and the radios power connector. This completes the installation of the transceiver. SOFTWARE COMMANDS Table 1 lists software commands commonly used during configuration of the transceiver. In many cases, no changes or settings will be required, as the radio is typically supplied ready for operation from the factory. These commands are provided in the event future changes are needed, or to facilitate troubleshooting of the unit. These commands require a PC to be connected to the transceiver as explained in the following steps:

1. Connect a PC to the transceivers connector as shown in P2 Figure 6. If desired, a connecting cable may be assembled using the information shown on Page 26. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 5 Invisible place holder Transceiver PC Running Terminal Session To DB-9 Management Port Figure 6. PC Configuration Setup 2. Launch a terminal communications program, such as HyperTer-

minal (included with most Windows are 8 data bits, no parity, and 1 stop bit (8N1). Data rate is deter-

mined by autobaud, but 1115200 bps is the preferred speed. systems). Data parameters TM 3. Press the ENTER key a few times (at half-second intervals) to obtain the ready > prompt on the screen. Commands may now be entered from the keyboard. Table 1. Command Summary Command Name Function ALARM AMASK AUDIO BOOT CHAN CKEY DATAKEY DUMP EMP FSET Alarm Summary Alarm Mask Audio Monitor/Orderwire Status Reboot Radio Channel commands (RX/TX frequency, RF power, bandwidth) Key TX Continuously (Digital Only) Key on Data Activity Read Current Unit Profile Modem TX Audio Pre-Emphasis Receive or Transmit frequency mini/max value 6 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 Table 1. Command Summary

(Contd) Command Name HELP HREV INIT MODE MODEL MTYPE OPT, OPTION, OPTIONS OWM OWN PROG Function User Help Display Hardware Revision Initialize EEPROM Defaults Radio Mode Model Number Information Modem Family Type Display Authorized Options Owners Message Owners Name Program PWRL, PWRM, PWRH, PWRRXH Power Lo (5W), Medium (20W), Hi (25), Extra-High (30W) PTT REF RSSI RXTOT SER SHOW SPECTRUM SQUELCH SREV STAT TEMP TOT VERSION Push-to-Talk Delay Reference Frequency Received Signal Strength Indicator Loss of RX Data Alarm Time Radios Serial Number Show Power Settings Internal Spectrum Analyzer Squelch Operation Software/Firmware Revision Level Alarm Status Internal Temperature TX Timeout-Timer Firmware Version 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 7 DETAILED USER COMMANDS The commands in this section may be used in two ways. First, you can type only the command name to view the currently programmed data. Secondly, you can set or change the existing data by typing the com-

mand, followed by a space, and then the desired entry. In the list below, allowable programming variables, if any, are shown in brackets following the command name. ALARM ALARM Alarm Summary The ating condition. An eight-digit code will be presented which can be decoded as described in Major Alarms vs. Minor Alarms. command displays a summary of the radio's current oper-

AMASK [0000 0000-FFFF FFFF]

AMASK FFFF FFFF Alarm Mask command displays or sets which events cause an alarm The AMASK output signal to be active. Normally, the mask is

, meaning that any of the 32 possible events will activate the alarm output signal. Entering the command alone displays the current setting of alarm events in hexadecimal format. Entering the command followed by an eight-digit hexadecimal number reprograms the speci-

fied events to trigger an alarm. The eight-digit hexadecimal number used as the command parameter specifies 0 to 32 events that can trigger the external alarm output. The hex value for the mask corre-

sponds to the hex value for the command. Each bit that is a '1'

identifies an alarm condition that can trigger the external output. For more information on configuring the alarm response, contact GE MDS. AMASK STAT ASENSE [HI/LO]

command sets or displays the sense of the alarm output Alarm Sense The ASENSE at Pin 6 of the COM2 port. Entering the command alone shows whether the alarm output is active high or low. Entering the resets the alarm output to ASENSE active high or low. command followed by ASENSE or LO HI 8 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 AUDIO [ON/OFF]

Audio Monitor/Orderwire Status Used to set or display Audio Monitor/Orderwire functionality (on or off) BOOT [1, 2, OTHER]

Reboot Radio Used to reboot to selected image or current image if no image speci-

fied. CHAN [0-8, ALL]

[RXFREQ xxx.xxxx]

(MHz)

[TXFREQ xxx.xxxx]

(MHz)

[PWR [5, 20, 25, 30]

(Watts)

[BW [12.5, 25]

(kHz) Channel Mods... If only the first argument is given, then it displays the channel(s) parameters. If a third (or greater) argument is given, then that channel with have its parameters changed. CKEY [ON/OFF] -

Digital Only CKEY Key TX Continuously The tion of the radio. When ON keyed and the Timeout Timer is disabled. is set to CKEY command enables or disables the continuously keyed func-

, the radio is continuously CTS [0-255]

Clear-to-Send Time The CTS (clear-to-send) command selects or displays the timer value associated with the CTS line response. The command parameter ranges from 0 to 255 milliseconds. For DCE operation, the timer specifies how long to wait after the RTS line goes high, before the radio asserts CTS and the DTE can transmit the data. A CTS value of zero keys the radio and asserts the CTS line immediately after the RTS line goes high. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 9 For CTS Key operation (see DEVICE command), the timer specifies how long to wait after asserting the CTS, before sending data out the DATA INTERFACE port. A timer value of zero means that data will be sent out the data port without imposing a key-up delay. (Other delays may be present based on selected radio operating parameters.) CTSHOLD [0-60000]

Clear-to-Send Hold Time Used in DEVICE CTS KEY mode, this command sets the amount of time in milliseconds that CTS remains present after transmission of the last character out the RXD pin of the DATA port. This hold time can be used to prevent squelch tail data corruption when communicating with other radios. The CTSHOLD setting can range from 0 to 60000 ms (i.e., 60 seconds). The default value is 0, which means that CTS will drop immediately after the last character is transmitted. If the command is entered when the radio is in DEVICE DCE mode, the response CTSHOLD N/A is dis-

played. DATAKEY [ON/OFF]

Key on Data Activity The DATAKEY command enables or disables the ability of the radio to key the transmitter as data is received at the DATA INTERFACE con-

nector. Asserting RTS keys the radio regardless of this command set-

ting. If DATAKEY is set to ON, the radio will key when a full data-character is received at the transceiver's DATA INTERFACE connector. If DATAKEY is set to OFF, the radio needs to be keyed by asserting RTS. DEVICE [DCE, CTS KEY]

Data Device Mode The DEVICE command controls or displays the device behavior of the radio. The command parameter is either DCE or CTS KEY. 10 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 In DCE mode (the default setting), CTS will go high following RTS, subject to the CTS programmable delay time. If the DATAKEY com-

mand is set to ON, keying can be stimulated by the input of characters at the data port. Hardware flow control is implemented by signaling the CTS line if data arrives faster than it can be buffered and trans-

mitted. In CTS KEY mode, the radio is assumed to be controlling another radio. It will still key based on the RTS line, but the CTS line is used as a key-

line control for the other radio. CTS is asserted immediately following the receipt of RF data, but data will not be sent out the DATA INTER-

FACE port until after the CTS programmable delay time has expired.

(This gives the other radio time to key.) DUMP Read Current Unit Profile This command causes all of the programmed settings to be displayed. EMP [ON/OFF]

Modem TX Audio Pre-Emphasis This command displays or sets the TX pre-emphasis and RX De-Emphasis when the radio is operating with the analog mode and the radio's modem is turned off (MODEM NONE). It should be set to match the other radios in the system. The use of pre and de-emphasis can help reduce the detrimental influence of high frequency audio noise. FSET Receive or transmit frequency min/max value HELP User Help Show available commands. HREV Display hardware revision 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 11 INIT Initialize EEPROM Defaults The INIT command is used to re-initialize the radio's operating param-

eters to the factory defaults. This may be helpful when trying to resolve configuration problems that may have resulted from the entry of one or more improper command settings. If you are unsure of which command setting may have caused the problem, this command allows you to get back to a known working state. The following changes to the radio are made when INIT is entered:

CTS is set to 0 DATAKEY is set to ON DEVICE is set to DCE PTT is set to 0 SCD is set to 0 TOT is set to 30 seconds and set to ON PWR is set to +37 dBm (5 watts) All other commands remain as previously set. MODE [NORMAL, TEST]

Radio Mode This command puts the radio into a TEST or NORMAL mode. In the test mode, it disables the radio from looking at the hardware channel select lines and automatically selects Channel 0. MODEL, MODEL1, MODEL2 Model Number Information MTYPE [SD | X710_AE | X710_B | LOOPBACK]

Modem Family Type OPT, OPTION, OPTIONS Display Authorized Options 12 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 OWM [XXX...]

Owner's Message This is a command to display or program an owner's message. To pro-

gram the owner's message, type OWM then the message, followed by an ENTER keypress. To display the owner's message, type OWM, followed by an ENTER keypress. The owner's message appears on the display. OWN [XXX...]

Owner's Name This is a command to display or program an owner's name. To pro-

gram the owner's name, type OWN then the name, followed by ENTER. To display the owner's name, type OWN then ENTER. The owner's name appears on the display. PROG Program The PROG command used for serial reprogramming - spoof entry into the bootloader. PROGRAM Program The PROGRAM command spoofing MDS x710 bootloader program command to start serial reprogramming. Erases and programs inactive image via serial port with xon/xoff flow control. Returns when com-

plete. If successful active image is switched. Only valid after program or prog command at LOADER> prompt. Used for serial reprogram-

ming. PWRL [0-30], PWRM [0-30], PWRH [0-30], PWRXH [0-30]

Sets Power Level This command sets the power level value for this name. This name is used for the power calibration command (CPWR). PWRL defaults to 5 watts, PWRM defaults to 20, PWRH is 25 and PWRXH is 30 watts. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 13 PTT [0-255]

Push-to-Talk Delay This command sets or displays the key-up delay in milliseconds. This timer specifies how long to wait after the radio receives a key signal, before actually keying the radio. REF [xxxxx]

Reference Frequency RSSI Received Signal Strength Indicator This command continuously displays the radio's Received Signal Strength Indication (RSSI) in dBm units, until you press the Enter key. Incoming signal strengths from -50 dBm to -120 dBm can be read. NOTE: The RSSI samples the incoming signal for one to two seconds before providing an average reading to the connected PC. RTU [ON/OFF/0-80] Digital Only RTU Emulator This command enables or disables the radio's internal RTU simulator, which runs with proprietary factory polling programs such as poll.exe and rsim.exe. The internal RTU simulator is available whenever a radio has diagnostics enabled. This command also sets the RTU address that the radio will respond to. The internal RTU can be used for testing system payload data or pseudo bit error rate testing. It can be helpful in isolating a problem to either the external RTU or the radio. RXTOT [NONE, 1-255]

Loss of RX Data Alarm Time The RXTOT command selects or displays the receive time-out timer value in minutes. This timer triggers an alarm (Event 12) if data is not detected within the specified time. Entering the RXTOT command without a parameter displays the timer value in minutes. Entering the RXTOT command with a parameter ranging from 0 to 255 resets the timer in minutes. Entering the RXTOT command with the parameter NONE disables the timer. 14 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 SCD [0-255]

Soft-Carrier Dekey This command displays or changes the soft-carrier dekey delay in mil-

liseconds. This timer specifies how long to wait after the removal of the keying signal before actually releasing the transmitter. A value of 0 millisec-

onds will unkey the transmitter immediately after the removal of the keying signal. SER Radio's Serial Number This command displays the radio's serial number as recorded at the factory. SHOW [DC, PORT, PWR]

Show Power Settings The SHOW command displays different types of information based on the command variables. The different parameters are:

DC-Display DC input/output voltages PWR-Display RF power output SPECTRUM [xxx.xx]

Internal Spectrum Analyzer Activates the built-in spectrum analyzer tool (see Figure 8) that can be displayed on a connected PC. This tool is helpful in diagnosing inter-

ference problems on or near your channel frequency. Access the spectrum analyzer by entering spectrum at the command prompt. A display appears showing detected signals on your current channel. Optionally, you can specify a frequency at the command prompt to view the surrounding spectrum of that frequency. To do this, enter spectrum xxx.xx, where xxx.xx is the frequency in MHz. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 15 A typical spectrum analyzer display is shown in Figure 8. The display creates a received signal strength indication (RSSI) vs. frequency plot for the frequency and surrounding signals. By analyzing the display, you can determine the presence of other signals near the transceiver's operating frequency. This information can be helpful in trouble-

shooting interference problems. SQUELCH [AUTO, BYPASSED]

Squelch Operation Set or display analog squelch bypass. SREV Software/Firmware Revision Level This command displays the software revision level of the transceiver firmware. STAT Alarm Status This command displays the current alarm status of the transceiver. If no alarms exist, the message NO ALARMS PRESENT appears. If an alarm does exist, a two-digit code (00-31) is displayed and the alarm is identified as Major or Minor. A brief description of the alarm code is also given. TEMP Internal Temperature This command displays the internal temperature of the transceiver in degrees Celsius. TOT [1-255, ON, OFF]

TX Timeout-Timer This command sets or displays the transmitter Time-out Timer value

(1-255 seconds), as well as the timer status (ON or OFF). If the timer is on, and the radio remains keyed for a longer duration than the TOT value, the transmitter is automatically unkeyed. 16 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 When this happens, the radio must be commanded back to an unkeyed state before a new keying command is accepted. The default timer value is 30 seconds. VERSION Firmware Version Displays package version information for each firmware image. RADIO TESTS & TEST MODE COMMANDS The following are checks and settings that can be performed by a tech-

nician to ensure optimal performance of the radio. For most tests, it will be necessary to connect a PC to the radio as described in SOFT-

WARE COMMANDS on Page 5. Antenna System SWR Check SWR is a parameter related to the ratio between forward trans-

mitter power and the reflected power from the antenna system. As a general guideline, reflected power should not exceed 10%

of the forward power ( 2:1 SWR). A high SWR may result in decreased performance, and should be corrected. The transceivers TXD/RXD LEDs will light when the SWR is too high. Actual SWR can be measured by connecting a reflected power meter, such as a Bird Model 43 directional wattmeter with the proper element installed, between the transceiver and the antenna system. Use the KEY/DEKEY commands described below to control the transmitter during these tests. Test transmis-

sions should be kept as brief as possible. If the results are normal, record them for comparison during future routine preventative maintenance. Abnormal readings indicate a possible trouble with the antenna or the transmission line that will need to be corrected. Look for cable damage, poor connections, or improper positioning of the antenna (such as having the antenna whip too close to a metal surface). 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 17 Over-Temperature Check If the transmitter is approaching an out-of-tolerance temperature con-

dition, an error code is issued (see Table 3) and the PWR lamp will flash. Further operation may be inhibited. Over-temperature condi-

tions should be investigated and resolved before further use of the radio. To read the actual internal temperature of the radio (in degrees Cel-

sius), the TEMP command may be issued from a PC. Excessive temper-

atures may be caused by inadequate ventilation of the transceiver case, or operating the unit beyond its rated duty cycle (see SPECIFICA-

TIONS on Page 26). Test Mode Commands The following commands may be used by a technician to test the radio or to make advanced setting changes during installation and mainte-

nance activities. BW [xxxxx]

Channel Bandwidth This command displays the current bandwidth or sets the modem bandwidth for channel 0. This command also sets the appropriate devi-

ation for this bandwidth. CHAN [0-8, ALL]

[RXFREQ xxx.xxxx] (MHz)

[TXFREQ xxx.xxxx] (MHz)

[PWR [5, 20, 25, 30] (Watts)

[BW [12.5, 25] (kHz) Channel Mods... If only the first argument is given, then it displays the channel(s) parameters. If a third (or greater) argument is given, then that channel with have its parameters changed. 18 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 DKEY Unkey Transmitter This command deactivates the transmitter after it has been keyed with the KEY command. KEY TX Key This command activates the transmitter. See also the DKEY command. MODEM [xxxx]

Analog/Digital Modem Selection This command selects the radio's modem characteristics. For digital operation enter MODEM xxxx, where xxxx equals the modem selection of the radio (9600 or 19200). For analog operation with an external modem, enter NONE for this parameter. When the MODEM command is set to NONE, the analog TX Input and RX Audio outputs of the DATA INTERFACE will be used to interface with the connected external modem, and digital operation is disabled. These levels must be set to complement the audio signal level require-

ments of the external modem. See RXLEVEL [-20 to 0] and TXLEVEL [-20 to 0, AUTO] for details on setting these levels. PWR [Watts]

NOTE: This function may not be available in all units, depending on certification requirements for a particular country. TX RF Power Output Level This command displays the current power level in watts or sets the desired RF forward output power setting for channel 0 of the radio. The PWR command parameter is specified in watts and its settings are 5, 20, 25, 30. The default setting is 5 watts. To read the actual (mea-

sured) power output of the radio, use the SHOW PWR command. RX [xxx.xxxx]

Receive Frequency This command displays the current receive frequency or selects the radio's receive frequency (in MHz) for channel 0. The frequency step size is 6.25 kHz. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 19 If the radios frequency has not been programmed at the factory, a default frequency will be programmed in the radio near the center of the frequency band. SELCHAN [0-8]

Select Channel This command causes the radio to go to another channel when the radio is in MODE TEST. It causes the radio to select appropriate RX and TX frequencies, power level and bandwidth for that channel. TX [xxx.xxxx]

TX Frequency This command displays the radio's transmit frequency in MHz or changes channel 0's transmit frequency. The frequency step size is 6.25 kHz. If the frequency has not been programmed at the factory, a default fre-

quency will be programmed in the radio near the center of the fre-

quency band. TROUBLESHOOTING For proper operation, all radios in the network must meet these basic requirements:

Adequate and stable primary power Secure connections (RF, data and power) A clear transmission path between stations An efficient antenna system providing adequate received signal strength. Proper programming of the transceivers operating parameters The correct interface between the transceiver and the connected data equipment (correct cable wiring, proper data format, tim-

ing, etc.) 20 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 LED Indicators The LED status indicators (Figure 7) are an important troubleshooting aid and should be checked whenever a problem is suspected. Table 2 describes the function of each status LED on the front panel of the radio. Invisible place holder PWR DCD TXD RXD Figure 7. LED Indicators Table 2. LED Status Indicators LED Name Description PWR TXD RXD DCD ContinuousPower applied, no problems detected. Rapid flash (5 times-per-second)Alarm indication. Unit is transmitting. Unit ready to receive data (not transmitting). Message is being received. Additional LED indicationsfor trouble conditions:

TXD/RXD lit: High Standing Wave Ratio (SWR). Check antenna system. PWR lamp flashing: Over temperature (Observe duty cycle, ensure adequate ventilation) Event Codes When an alarm condition exists, the transceiver creates a code that can be read on a connected terminal. These codes can be helpful in resolving many system difficulties. Refer to Table 3 (Page 22) for a definition of the event codes. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 21 Checking for AlarmsSTAT command To check for alarms, connect a terminal to the radios P2 Programming

& Diagnostic port. See P2 PROGRAMMING & DIAGNOSTIC INTERFACE on Page 26 for pinout information. Enter STAT on the connected terminal. If no alarms exist, the message NO ALARMS PRESENT appears on the display. If an alarm does exist, a two-digit alarm code (0031) is displayed and the event is identified as a Major or Minor Alarm. A brief description of the alarm is also given. Major Alarms vs. Minor Alarms Major Alarmsreport serious conditions that generally indicate a hardware failure, or other abnormal condition that will prevent (or seriously hamper) further operation of the transceiver. Major alarms generally indicate the need for factory repair. Contact your factory representative for assistance. Minor Alarmsreport conditions that, under most circumstances will not prevent transceiver operation. This includes out-of-tolerance con-

ditions, baud rate mismatches, etc. The cause of these alarms should be investigated and corrected to prevent system failure. Event Code Definitions Table 3 contains a listing of event codes that may be reported by the transceiver. The codes shown are a subset of a larger pool of codes used for various GE MDS products. For this reason, the table does not show a sequential listing of all code numbers. Only the codes appli-

cable to this product are shown. Table 3. Event Codes Event Code 01 04 08 Event Class Major Major Major Description Improper software detected for this radio model. The RF synthesizer is reporting an out-of-lock condition. The system is reporting that it has not been calibrated. Factory calibration is required for proper radio operation. 22 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 Table 3. Event Codes (Contd) Event Code 12 13 17 Event Class Major Minor Minor 18 Minor 26 31 Minor Minor Description Receiver time-out. No data received within the specified receiver time-out time. A Transmitter timeout was detected. The radio stayed keyed longer than the duration specified by the TOT command. A data parity fault has been detected on the PAYLOAD port. This usually indicates a parity setting mismatch between the radio and the customer equipment. A data framing error has been detected on the PAYLOAD port. This may indicate a baud rate mismatch between the radio and the customer equipment. The DC input voltage is out-of-tolerance. If the voltage is too far out of tolerance, operation may fail. The transceivers internal temperature is approaching an out-of-tolerance condition. If the temperature drifts outside of the recommended operating range, system operation may fail. Internal Spectrum Analyzer The radio contains a built-in spectrum analyzer tool (Figure 8) that can be displayed on a connected PC. The tool is helpful in diagnosing interference problems on or near your channel frequency. Access the spectrum analyzer by entering spectrum at the command prompt. A display appears showing detected signals on your current channel. Optionally, you can specify a frequency at the command prompt to view the surrounding spectrum of that frequency. To do this, enter spectrum xxx.xx, where xxx.xx is the frequency in MHz. As shown in Figure 8, the display creates a received signal strength indication (RSSI) vs. frequency plot for the frequency and sur-

rounding signals. By analyzing the display, you can determine the presence of other signals near the transceivers operating frequency. This information can be helpful in troubleshooting interference prob-

lems. 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 23 Invisible place holder Figure 8. Internal Spectrum Analyzer Display P1 CONTROL INTERFACE Table 4 lists the pin functions on the P1 Control Interface connector. Table 4. P1 Control Interface Pin Descriptions (DB-25) Pin No. Description 1 2 3 4 5 6 7 8 9 No connection (NC) Audio Isolated Ground No connection (NC) Detected Audio Channel Select 3 (see Note 1). RXD+ (RS-485/422 digital). Output from radio. PTT Keying signal (see Note 2) RXD- (RS-485/422 digital) Output from radio. No connection (NC) 10 No connection (NC) 24 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 Table 4. P1 Control Interface Pin Descriptions 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Audio Isolated Ground No connection (NC) No connection (NC) Channel Select 2 (See Note 1) No connection (NC) RS-485/422 Isolated Ground TX Audio input to radio Channel Select Isolated Ground Channel Select 0 (Note 1) No connection (NC) PTT Isolated Ground No connection (NC) Channel Select 1 (Note 1) TXD+ (RS-485/422 digital). Input to radio. TXD- (RS-485/422 digital) Input to radio. Note 1:

Channel select decoding as follows: High = no connection; Low = Gnd. See table below for radio channel selections. Note 2:

Provide low impedance path to ground to key transmitter. Table 5. Channel Selection Table Channel 3 Channel 2 Channel 1 Channel 0 Selected High (future use) High (future use) High (future use) High (future use) High (future use) High (future use) High (future use) High (future use) High High High High Low Low Low Low High High Low Low High High Low Low High Low High Low High Low High Low 1 2 3 4 5 6 7 8 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 25 P2 PROGRAMMING & DIAGNOSTIC INTERFACE Table 4 lists the pin functions on the DB-9 DIAGNOSTIC INTERFACE connector. Table 6. Diagnostic Interface Pin Descriptions (DB-9) Pin No. Description 1 2 3 4 5 6 7 8 9 No connection (NC) RX Data TX Data No connection (NC) Signal Ground No connection (NC) No connection (NC) No connection (NC) No connection (NC) SPECIFICATIONS GENERAL Frequency Range*:

Number of Channels:

450512 MHz 8 RECEIVER Maximum Usable Sensitivity:

0.35 uV for 12 dB SINAD Bandwidth:

Maximum Applied Signal:

12.5 kHz

+28 dBm TRANSMITTER RF Carrier Power:

Duty Cycle:

Output Impedance:

Channel Spacing:

FCC Emission Designators:

6.25 kHz B/W:

5 Watts to 30 Watts 25%

50 12.5, 25 kHz 4K00F1D, 4K00F2D,4K00F3D 26 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 12.5 kHz B/W:

25.0 kHz B/W:

9K30F1D, 9K30F2D, 9K30F3D 16K5F1D, 16K5F2D, 16K5F3D DATA CHARACTERISTICS

(P1 Control Interface Connect) Payload Signaling Type:

Connector Types:

Payload Data Rate:

CCITT V.23 DB-25 Female 1200 bps DATA CHARACTERISTICS

(P2 Programming & Diagnostic Port) Connector Type:

Signaling Standard:

DB-9F RS-232 PRIMARY POWER Voltage:

TX Supply Current:

RX Supply Current:

Power Connection:

Fuse:

13.6 Vdc (+/- 15%) Negative-Ground Systems Only 8 Amperes (Typical) @ 30 Watts Output Operational125 mA, Nominal 5-inch pigtail (14 AWG) with Tyco/AMP connector (Part No. 172129-1) 8-Ampere, internal 05-4819A01, Rev. 08 LCT 450 Installation/Operation Guide 27 28 LCT 450 Installation/Operation Guide 05-4819A01, Rev. 08 i e d u G n o i t a l l a t s n I GE MDS, LLC 175 Science Parkway Rochester, NY 14620 General Business: +1 585 242-9600 FAX: +1 585 242-9620 Web: www.gemds.com