Trio Datacom EB450-XXF01 Remote Radio Data Modem Base/Repeater User Manual temp warning E Series R3

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Page 35E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.Front Panel OperationSwitchesSelect SwitchThe 3 position switch (1 / Auto / 2) on the front panel provides thefollowing functionality:• Position 1: base station 1 is forced into operation• Position Auto: changeover hardware will select the online basestation• Position 2: base station 2 is forced into operationThe select switch is also used to identify the target base station forconfiguration programming.Adjacent to the select switch are two LEDs: These LEDs indicate thecurrent active base station.Select LED’s•Green - Auto Mode•Red - Remote Force•Amber - Local Force2 Green Firmware Download2 Amber Test Mode2 Red Fatal Error - refer user manualReset SwitchThis is a momentary close switch which when depressed will reset allLED alarm indications.System PortThere are two system port connection points, one on the rear paneland one on the front panel. Both have the same functionality and canbe used for local diagnostics, firmware front panel downloads and hotstandby controller testing. To access the system port use thediagnostic/programming cable supplied.Note: Wnen connection is made to front panel system rear systemport is disabled.Alarm Status LEDsThere are 10 alarm LEDs on the fron panel, five for base 1 and five forbase 2. These LEDs provide a general indication of base stationstatus. More detailed base station status information is available byusing the diagnostic utility software.The indicated alarms for each base station are:Freq. => Frequency ErrorRxSig => Receive Signal (RF) ErrorData => Receive Data ErrorTxPower => Transmit Power (RF) ErrorSupply => DC Voltage ErrorThe status of each alarm is represented as follows:Green => No ErrorRed => Current (active) Error conditionAmber => Recovered Error conditionAny active or recovered error LEDs will turn to green after the resetalarms switch has been pushed or remotely reset.Part E  Getting Started - EH450

Page 36E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.Part F - Operational FeaturesMultistream functionality (SIDcodes)The E Series sends data messages in packets. A feature of the ESeries is that an address can be embedded in each packet. Thisaddress is called the stream identifier code (SID).By configuring a user serial port for a specific SID code, it ispossible to steer messages to similarly configured ports betweenradio modems. In effect, it is possible to use the multiple serialports available on the E Series, to enable multiple protocols toshare the same RF channel. The SID codes also facilitate the useof other features such as TView diagnostics. Unique selectiverouting, repeating, and data splitting functions available in the radiomodems configuration allow data steering and bandwidthmanagement in complex systems.See Part I - TView+ Management Suite - Programmer and Part J -TView Remote Diagnostics and Network Controller for details.Collision Avoidance (digital andRFCD based)Where multiple “un synchronised” protocols co-exist on a common“multiple access” radio channel, there is always a possibility thatboth “hosts” may poll different “remote” devices at the same time. Ifboth devices attempt to answer back to the single master radio atthe same time, it follows that a collision could occur on the radiochannel.To facilitate the operation of multiple protocol operation on theradio channel, a transparent collision management system has beenimplemented : See Part I - TView+ Management Suite - Programmerfor details.Digital Collision Avoidance SystemIf the “multiple access master” has been configured for full duplexoperation, it is possible to use the inbuilt collision avoidance signalingsystem.Once the master radio receives a valid incoming data stream from aremote, a flag within the “outbound” data stream is used to alert allother remote devices that the channel has become busy. Remotedevices wishing to send data will buffer the message until the channelstatus flag indicates that the channel is clear. A pseudo-random timingvalue is added to the retry facility to ensure that waiting remotes do notretry at the same time.RF Carrier Detect RSSI based CollisionAvoidanceIn half duplex systems, the receiver’s RF carrier detect is used toinhibit the transmitter whilst a signal is being received.Digipeater OperationA feature of the E Series radio modems is the ability to internallyrepeat data packets to provide stand alone repeater facilitieswithout the need for external intelligence.This is done by programming “SID Codes” to “Repeat” a stream orrange of streams. Wizard templates can be used to simplify setupof this and other features.See Part I - TVIEW+ Management Suite for details.TVIEW+ DiagnosticsThe E Series has an inbuilt remote configuration and diagnosticsutility.This facility allows transparent remote access to the keyconfiguration and operating parameters of the radio.See Part J - TView Remote Diagnostics and Network Controller fordetails.Part F  Operational Features

Page 37E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.Part G  CommissioningCheck DC power connector for correct voltage (10-16VDC) andpolarity, BEFORE plugging in the power connector.Power-upUpon power up, the radio will self test and shortly after the greenpower LED will be displayed.Failure of the power LED to light indicates no power, or failure ofthe fuse due to incorrect polarity or over-voltage.Other failure such as fatal internal errors will initiate error modesindicated by a flashing sequence of all LEDS red, followed by oneor more green LED’s to indicate the nature of the failure (see Part E– Getting Started: LED Indicators and Test Outputs).LED IndicatorsWill depend on the system architecture. If the device is a remote sitereceiving a base station with a constant carrier, then the RXSIG/SYNC LED should be green to indicate healthy reception of thewanted signal.If the site has been configured as a constantly transmitting base station,then the PWR/TX LED should show red.In other types of systems, TX and RX bursts would be indicated bythe RX or TX LED’s as above.Data flow to and from the user ports is indicated by the TXD/RXDLEDs for each port.(See Part E – Getting Started: LED Indicators and Test Outputs.)Data Transfer IndicationsBi-colour LEDs are provided to indicate RS232 data beingtransmitted and received on each data port. A RED flash indicatesa byte (or bytes) of incoming data from the serial line which will betransmitted to air, and a green flash indicates a byte of datareceived “off air” being released onto the serial line.If data is being sent to the radio modem and the Data LED doesnot flash RED, this may indicate a wiring or configuration problem.Check that the TX and RX data lines are correctly wired (see Part E– Getting Started: LED Indicators and Test Outputs).Also check that character set and parity settings (i.e. N,8,1 etc) areset identically at the terminal and the radio modem. Note that someincorrect settings of the character set parameter can still producetransmittable data, even though the data will not be understood bythe application.Antenna Alignment and RSSITestingOnce the RXSIG LED is lit, it is possible to confirm RX signal strengthand align a directional antenna by monitoring the RSSI output.This DC voltage appears at Pin 9 of Port B.A ground reference can be obtained from chassis ground or Pin 5 ofPort A or B.The chart below shows Pin 9 voltage as it relates to signal strength.Part G  CommissioningLink Establishment and BERTestingOnce communications has been established, it is possible to confirmthe packet error rate performance of the radio path, and thus estimatethe BER figure.There are a number of tools provided to do this. The easiest is to usethe “indicative packet error test” provided within the TVIEW+Diagnostics under “statistical performance tools”. Alternatively, it ispossible to use hyper terminal, or other packet test instruments orPC programs to run end to end or perform “loopback” testing.Please note that when using a “loopback plug” some understanding ofthe packetising process is necessary, since each “test message’ mustbe carried in a single packet for meaningful results to be obtained.Note also that in PTMP systems, allowance must be made forcollision potential if other data is being exchanged on the system.VSWR TestingVSWR testing is achieved using specialized VSWR testingequipment, or a “Thruline” power meter that measures forward andreverse power.VSWR is the ratio between forward and reflected transmitterpower, and indicates the health and tuning of the antenna andfeeder system.VSWR should be better than 3 to 1, or expressed as a power ratio,<6dB or no more than 25%. To activate the radios transmiter forVSWR testing, use:a) An RTS loopb) A system port PTT plugAnalog RSSI Output Characteristics - E Series Data Radio00.511.522.533.544.55-120-110-100-90-80-70-60-50-40RF Level (dBm)RSSI (DC Volts)

Page 38E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.Part H  MaintenanceRoutine MaintenanceConsiderationsThe E Series hardware itself does not require routine maintenance.However all radio products contain crystal frequency references,and the stability of these crystals changes with time. The effect ofthis is that the product will slowly drift off frequency, and eventuallyit will require re-calibration. E Series radios are designed with highquality, low drift specification references, to ensure a longmaintenance free lifespan. The length of this lifespan will dependon the severity of temperature extremes in the operatingenvironment, but is normally 3–5 years. Extended frequency driftcan be detected using TVIEW+ Diagnostics “Freq error” parameter.Generally, recalibration is achieved by replacing the radio in thefield with a spare, and returning the radio to a service centre for re-calibration and specification testing at moderate cost.Routine maintenance should be performed on external equipmentsubject to greater environmental stresses including antennas, RFfeeder cables, backup batteries and cooling fans (if required). Thismaintenance should include testing of site commissioning figuressuch as received signal strength, VSWR, P/S voltage etc.Part H  Maintenance

Page 39E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.SECTION 2Part I  TVIEW+ Management Suite -ProgrammerPart J  TVIEW Remote Diagnostics andNetwork ControllerPart K  AppendicesPart L - Support OptionsSECTION 2  TVIEW+ Management Suite

Page 40E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.Part I  TVIEW+ Management Suite - ProgrammerPart I  TVIEW+ Management Suite -ProgrammerIntroductionThis manual covers the installation and operation of the E SeriesTVIEW+ Management Suite which incorporates 3 utilities:• Programmer for configuration of the radio RF parameters,system parameters and data ports• Diagnostics* for real-time monitoring and logging of radioperformance parameters• Firmware Update for loading new firmware releases into theradio data modemAll utilities can be run on any IBM compatible computer runningWindows 95® and above. This section describes use of theprogrammer and firmware Update utilities in detail. Users should referto the separate Diagnostics section for information about this utility.The programmer is used to set configuration parameters within theER450 data radio modem and EB450 base station. The utility permitsconfiguration of modems connected directly to the PC as well as overthe air to a remote unit. Configuration parameters can be saved to adisk file for later retrieval, or used for clone programming of othermodems.All configuration parameters are held in non-volatile memory(NVRAM) on the Data Radio Modem. Configuration is fullyprogrammable via the Systems Port using the programming adaptorand cable supplied. Disassembly of the unit is not required for anyreason other than for servicing.The diagnostics utility permits monitoring and logging of radioperformance parameters for both E Series* as well as D Series* dataradio modems and base stations. It supports homogeneous systemsof radios as well as mixed systems of both E and D series radios.The firmware update utility permits field upgrade of the firmware in anER450 data radio modem, EB450 base station and EH450 hotstandby unit connected directly to the PC. A special serial adaptorcable is required to be connected to Port B to load firmware into theunit.* Requires the optional DIAGS Network Management and RemoteDiagnostic Facility to be installed - per radio.InstallationUnit ConnectionProgrammer and Diagnostics UtilitiesThe unit is connected to the PC using the supplied DB9-RJ45 adaptorcable (part no. TVIEW+ Cable) for local configuration changes ordiagnostic monitoring. The cable should be connected to the RJ45System Port of the unit and a valid PC serial port (eg; COM 1) DB9connector.(See Part E - Getting Started: Communications Ports)Firmware Update UtilityThe unit to be updated with firmware connects to the PC using theDB9-DB9 adaptor (part no. DRPROG). The cable should beconnected to the DB9 Port B connector on the unit and a valid PCserial port (See Appendix C for details) DB9 connector.SoftwarePlease take a moment to read this important information before youinstall the software.The installation of this Software Suite is a 2 step process.Step 1 completes the typical installation of the TVIEW+ ManagementSuite and will install the Programming Software together with the ESeries Documentation.Step 2 installs the Diagnostic Software and is optional. This step isonly required if your radios have Remote Diagnostics enabled.STEP 1: Installation - TVIEW+ ManagementSuiteNote: If a previous version of the TVIEW+ Management Suite hasbeen installed on your PC, you must uninstall it via Control Panel“Add/Remove Programs”.• Close down all other programs currently running.• Place the CD-ROM in the drive on the PC.• Using Windows Explorer locate the files on the CD-ROM.• In Windows Explorer double click on the file calledTVIEW+_(Version#)_install.exe• After the installer starts follow directions.

Page 41E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.ProgrammerMain WindowWhen first started the programmer is in file mode as indicated by themode field at the bottom right of the panel shown below. In this mode itis possible to open a previously saved configuration file, or configurevarious programming options and save the configuration to a file.Note: Modulation type is not available in this mode.To commence programming a unit (radio remote or base station) asession must first be established by using the “READ” function. Thisfunction reads the current configuration from the unit and displays it inthe main window. The “mode” displays changes to local or remotedepending on the type of session selected at the read function. Severaloptions in the main window may be blanked out until a session hasbeen established with a unit.Note: Changing any item on the menu will in general not take effectuntil data is written back to the unit using the “WRITE” function.The procedure to follow for normal programming of unit is:• Read unit• Configure parameters (or Open a previously savedconfiguration file)• Write unitSeveral modems of the same radio type can be programmed with thesame configuration using the clone facility described in Clone Mode. Itis important to note that when using this facility the cloned radio shouldbe of the same type to ensure it does not operate outside its capability.Part I  TVIEW+ Management Suite - ProgrammerSTEP 2: Installation - TView DiagnosticSoftware (Optional)Note: If a previous version of the “TView WinDiags” software hasbeen installed on your PC, you must uninstall it via Control Panel“Add/Remove Programs”.• Close down all other programs currently running.• Place the CD-ROM in the drive on the PC.• Using Windows Explorer open the “Diagnostics” directory onthe CR-ROM.• Double click on the file called setup.exe• After the installer starts follow directions.Other:The current E Series Manuals are supplied and installed as part of theTVIEW+ Management Suite installation in Adobe Acrobat format.Adobe Acrobat Reader is provided on the CD-ROM for installation ifrequired.TVIEW+ Front PanelWhen started the TVIEW+ front panel appears. The larger buttonspermit each of the three utilities to be started. The diagnostics buttonmay be greyed out if this utility has not been installed or found in thecorrect file directory. Access to local help and an exit facility areprovided by the remaining 2 buttons.

Page 42E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.Pull Down Menus and Toolbar ButtonsThe items on the pull-down menus can be selected either directly witha mouse or using the ALT key in combination with a HOT KEY (egALT-F to select the file menu). Several of the functions within eachmenu are also available on the toolbar (click once to select).File MenuThe file menu allows the user to load (open) or save configuration dataas well as to quit the program. The files are saved with an “.cfg” fileextensionOpen (also available on the toolbar)This function is used to load an existing configuration file that can beused to directly program the radio or to use as a starting point to editconfiguration parameters. Note that a session must be establishedwith the unit by initially reading the configuration parameters from theunit prior to being written to a unit.If in file mode the modulation type will not be displayed. If in local/remote mode and a file that was saved from local/remote mode isopened, then modulation type will be imported and used, but only if itis valid for the connected hardware. If not then the units readmodulation type will be used.Save (also available on the toolbar)This function is used to save the current configuration parameters to afile for future recall.If in “file mode” only basic RF, Port and System parameters aresaved and re called. If in local/remote mode then modulation type issaved and re called.Print (also available on the toolbar)This function prints out the configuration data to the default printer in astandard format. There are no options for this item.This should be used if a complete record is required for site/unitconfiguration. Firmware/Modulation/Diags/Hardware type are allprinted.Exit (also available on the toolbar)This function terminates the program. The user is requested to confirmthis selection before exiting the application.Modem MenuThis radio menu allows configuration data to be readfrom and written to the unit (remote radio or basestation) using the selected PC serial port connection(see Settings menu). The action of reading theconfiguration establishes a session with the unit.Communications is maintained with the unit to ensurethat the session remains open. If the session has been lost due to datatransmission errors or disconnection of the programming cable it willneed to be re-established to ensure any updated configuration is writtensuccessfully to the unit.Read (also available on the toolbar)This function establishes a session with the unit, reads configurationdata from the unit and displays it in the programmer main window.When selected a dialogue window appears prompting the user tochoose whether the unit to read is local (connected directly to the serialport or remote (connected over the air to the unit connected to serialport). Unit no. (serial no.) musty be entered and the stream SID codeis “on” (default =0)). After configuration data is read from the unit it isavailable for editing and writing back to the unit or saving to a file. Theprogress of data transfer to or from the unit is indicated by a messagewindow as well as a rotating indicator in the bottom right hand cornerof the main window.Write (also available on the toolbar)This function writes configuration data displayed in the main window tothe unit and reboots the unit. When selected a dialogue windowappears prompting the user to confirm whether to proceed. A progressindicator in the bottom right hand corner of the main window isdisplayed while data is being read. This selection is only available if asession has been previously established and maintained with the unit.Part I  TVIEW+ Management Suite - Programmer

Page 43E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.This dialog provides a facility for reversing any remote configurationchanges and reverting to the previous configuration.Select “No” to send a command to the unit to accept the newconfiguration changes and to close the session. Select “Yes” to send acommand to the unit to cancel the new configuration changes and toclose the session.The configuration settings will revert to their previous values if the datacommunications circuit with the unit has been interrupted after the newchanges have been made, but before they have been verified, as justdescribed, then the unit will automatically discard the new changes. A“Timeout Error” message will appearin the event of such aninterruption and the programmer will revert back to file mode.After configuration data has been written the session with the unit isclosed and the programmer goes back to file modeNOTE: In general any change made on the programmer screen mustbe written to the unit using this function before it becomes permanentlystored. Changes to Power Adjust, Mute Adjust and Tx/Rx Trimhowever do take immediate effect to permit a tuning capability prior tobeing permanent stored.Cancel Session (also available on the toolbar)This function closes the session with unit and puts the programmerback into file mode. All configuration changes are discarded includingchanges to Power Adjust, Mute Adjust and Tx/Rx Trim.Wizard (also available on toolbar)This function permits the user to select standard configurations after theconfiguration from a unit has been read or a file opened. The user isprompted via a series of dialogue windows to select the desiredconfiguration that can then be written to the unit (remote radio or basestation).Part I  TVIEW+ Management Suite - ProgrammerClone ModeThis function permits writing of the same configuration data to severalunits. This feature is normally used for configuring data radio modemsconnected locally. The procedure is:• Read the configuration from the first unit• Configure the parameters (or Open a previously savedconfiguration file)• Select Clone Mode (Modem menu)• Write the configuration to the first unit• The changes will take effect when repowered• Connect the next unit• Write the next unit which establishes a session and recognisesthe unit serial number and type, and then configures the unit• Repower the unit for changes to take effect• Repeat the last 3 steps for the remaining units.SettingsThis menu permits selection of the PC serial port (COM1 to COM4)to be used for communications with the unit. COM1 is the defaultselection and if a different port is to be used it must be set beforeestablishing a session by reading the configuration from a unit. Whilsta session is established with a unit this menu can not be accessed.HelpThis menu permits selection of help information using the Contentskey. Warnings regarding use of the programmer software using theWarnings key and version detail using the About key.Port A and Port B ConfigurationData from these two user ports is multiplexed for transmission over theair. Each port can be configured separately for the Character layer(Data speed, number of data bits, number of stop bits, parity), Packetlayer and Handshaking (flow control). Port B must be enabled ifrequired by setting the check box at the top of its configuration section.if Port B is off, the 16K memory is split equally between Port A Rx/Txbuffers (ie: 8K & 8 K). If Port B is on, then the 16K is split equallyacross Port A & B Rx/Tx buffers (ie: 4K, 4K, 4K & 4K).The following description is common to both ports.

Page 44E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.Packet LayerThere are two standard configurations and a custom configurationwhich can be selected by checking the appropriate control button to theleft of the description. There are essentially two basic modes ofoperation for the packet assembler and disassembler (PAD). The firstis where the PAD operates in a standard mode with data received atthe port being immediately sent over the radio channel. The second isa store and forward or delayed mode where whole data packets arereceived from the port before being sent over the radio channel. In bothcases data is sent over the radio channel in variable length frames anddelineation of these frames is dependent on the configuration selectedas well as the characteristics of the data stream received at the dataport.The packet layer configuration options which can be selected are:Standard (live framing)With standard live framing data received from the host by the modemis immediately placed into a frame and transferred onto the radiochannel. This avoids placing “store and forward” delays in the datatransmission.If a stream of characters is received by the modem, then severalcharacters at a time may be placed into the same frame. The numberof characters in the frame depends mainly on the respective baudrates of the user port and the primary channel baud rate of the modem,as well as the level of overheads experienced on the radio channeland the user data stream.For example a constant stream of 300 baud user data placed onto a9600 baud channel will result in 1 character per frame beingtransmitted. If the user baud rate was lifted to 9600,N,8,1 with acontinuous data stream, then the frame size would settle to about 16characters plus 32 overhead bits. If collision avoidance is enabled asmaster the average frame size will increase to 32 characters plusoverhead bits.The number of data bits associated with the user data stream will alsohave an effect on the average size of a frame. For instance thenumber of stop bits, and number of data bits per character.The system designer must choose the best compromise of all theabove items to ensure the most efficient method of data transmission.Note: The first character is always packetized and sent by itselfregardless of all the above variables.ModbusThis selection configures the PAD driver with options automatically setto implement the MODBUS protocol. eg: 5 mSec timer.CustomOther configurations of the PAD driver can be selected via the Custombutton which displays a dialogue box to permit selection of severalconfiguration options as follows:SLIP / DIAGNOSTICSSLIP is a well known protocol for transferring binary datapackets over a data link. Each data packet is delineated by<FEND> characters, and a substitution mechanism exists thatallows these characters to be included in the data packet.Appendix B describes the SLIP protocol which is usedextensively in UNIX(tm) based systems, and is closelyassociated with TCP/IP networks.The diagnostics controller package uses the SLIP protocol tocommunicate between base station and remote modems.DNP-3 / IEC870This selection configures the PAD driver to implement the DNP-3Protocol and IEC870 Protocol.Pull Down Menu SelectionThe PAD driver can be configured for a number of vendorspecific protocols by selecting the desired option.Part I  TVIEW+ Management Suite - ProgrammerCharacter LayerThere are two standard formats and a custom format that can beselected by checking the appropriate control button to the left of thedescription. The standard formats are:• 9600,N,8,1 (data speed = 9600 bps, no parity, 8 data bits, 1stop bit)• 4800,N,8,1 (data speed = 4800 bps, no parity, 8 data bits, 1stop bit)A non-standard format can be selected via the Custom button thatdisplays a dialogue box to permit selection of data speed, parity,number of data bits and stop bits. Once selected the OK button shouldbe used to complete the selection. The custom selection is alsodisplayed in the main window below the Custom button.

Page 45E Series Data Radio – User Manual © Copyright 2002 Trio DataCom Pty. Ltd.Custom FormatThis selection permits PAD driver to be configured in a variety ofways and requires a greater understanding of the system design.For the modem to successfully transmit its packets (or frames) ofdata over the radio channel, it must be told on what basis todelineate data packets received at the data port. Once the end ofa data packet has been received at the port the data frame isclosed and transmission over the radio channel commences.Delineation of data packets can be configured to occur via anycombination of:• A predefined minimum time delay between packets receivedat the port. Typically the time delay would reflect the absenceof a couple of characters in the data stream at the specifieduser port baud rate.• Limiting the maximum number of characters which can be putin the data frame sent over the radio channel.• Receipt of a selected end of message (EOM) character at theport. An ASCII carriage return (character 13) is often used forthis purpose.As each data frame to be transmitted over the radio channel hasoverhead data consisting of checksums and SID codes. Thesystem designer must determine the best compromise betweenthe ratio of overhead versus user data which depends on packetsize and user data packet transmission latency.The fields which can be configured are:•Character Input timer: Set the input timer value in ms or enterzero to disable. Range 0 - 255.•Maximum Frame Size: Set the maximum number ofcharacters or enter zero to disable. Range 0 - 4095.•EOM Character: Select the check box to the left of thedescription to enable and enter the EOM character as adecimal value. Range 0 - 255.HandshakingIf the standard PAD is selected (i.e. any settings apart from SLIP/Diagnostics), then flow control can be either hardware handshaking,XON/XOFF protocol or none.The XON/XOFF flow control is not possible when using either theSLIP/Diagnostics protocol.The Handshaking section of the screen allows the selection of either ofthe handshaking methods as well as allowing handshaking to bedisabled.Details of the two handshaking methods are given below.HardwareThe modem acts as Data Communications Equipment (DCE) andsupplies to the host controller the following interface signals:Data Set Ready (DSR)Data Carrier Detect (DCD)Clear To Send (CTS)Receive Data Output (RXD)The host controller must act as Data Terminal Equipment (DTE) andsupplies to the modem the following interface signals :Data Terminal Ready (DTR)Request To Send (RTS)Transmit Data Input (TXD)• DCDDCD has several modes of operation. It is set to TRUE whendata is being transferred from the modem to the host - RXD lineactive. The signal is asserted approximately 500ms before thestart bit of the first character in the data stream and remains forapproximately 1 character after the last bit in the data stream. Theother modes of operation are dependent on the advancedsettings.• DSRDSR is permanently set to TRUE.• CTSThe CTS is a signal from the modem to the host informing thehost that the modem is able to accept incoming data on the TXDline. It responds to the actions of the RTS line similar to theoperation of a “standard” line modem.The CTS is FALSE if the RTS line is FALSE. Once the RTS lineis set to TRUE (signalling that the host wants to send some datato the modem on the TXD line), then the CTS will be set TRUEwithin 1ms, if the modem is capable of accepting more data.The CTS line will be set to FALSE if the transmit buffer in themodem exceeds 4075 bytes, or the number of queued framesexceeds 29 to ensure that no overflow condition can occur.Part I  TVIEW+ Management Suite - Programmer

$Page 46E Series Data Radio – User Manual© Copyright 2002 Trio DataCom Pty. Ltd.• RTSThe RTS line is used for two reasons. The first is to assert theCTS line in response to RTS. The RTS line can also be used tokey up the transmitter stage of the modem.• DTRThe DTR line is used for flow control of data being sent from themodem to the host controller. When the host is able to acceptdata it sets this line to TRUE, and if data is available within themodem, it will be sent to the host. If the host cannot accept anymore data, then it sets the DTR to FALSE, and the modem willstop all transmissions to the host.• Xon/XoffIf the flow control mechanism is XON/XOFF then the modemuses the standard ASCII control codes of DC1{^Q=11(Hex)=17(Dec)} for XON and DC3{^S=13(Hex)=19(Dec)} for XOFF. The DTR input line is totallyignored.NOTE: There is no substitution mechanism employed in theXON/XOFF protocol, so care must be taken when transferringbinary data to ensure that invalid flow control characters are notgenerated.AdvancedThis button provides access to the advanced features of the portconfiguration. When selected a dialogue box appears which permitsselection of the source for the port DCD output signal.DisabledThis selection disables the DCD output on the port. This selection isnot permissible if hardware based flow control has been selected.RF Carrier DetectThis selection causes DCD to be asserted at the onset of a receivedRF signal being detected. This will generally occur severalmilliseconds before data is transmitted from the port.Data Detect (RS485 Flow Control)This selection causes DCD to be asserted when data is about to betransmitted from the port. This option is not available if handshaking isset to “None” or “Xon/Xoff”.RF ParametersThis section of the main window permits adjustment of transmitter andreceiver, radio channel modulation scheme, frequency trim andadvanced features.TransmitterThe transmitter can be configured for transmit frequency and powerlevel.FrequencyThe required transmit frequency in MHz can be entered in the displayfield. The programmer checks that the selected frequency is in therange for the particular model of radio and provides warnings if not.Power AdjustThe currently selected transmit power is displayed below the button indBm. The power level can be adjusted by selecting this button whichdisplays a dialogue box. The up/down keys, or a typed in value, canbe used to select the required power level in dBm steps. There aretwo methods for setting the power.Part I  TVIEW+ Management Suite - Programmer$