NL5500 User Manual
Contents
1. Category Parameter Default Value Custom Value Radio Unit Type Remote MYID 1234 TOID Active Channel 1 Rx Frequency on Active Channel 464 5500 MHz Tx Frequency on Active Channel 464 5500 MHz Serial Baud Rate 9600 Data Bits 8 Stop Bits 1 Transmit Character Timeout 100 Transmit Character Timeout None DCD Mode Disabled Pre Data DCD Time 500 msec Post Data DCD Time 500 msec Diagnostic Programming Mode Disabled Data Maximum Packet Size 300 Packet Mode Enhanced Telem Data Rate 12000 bps ACKs Disabled Contention CSMA Repeater Trigger MYID Entry ID 0000 Transmit Channel 1 Transmit Delay ms 0 Table 5 Factory Default Values RF Neulink 41 NL5500 User Guide acknowledgements 26 Active Channel 32 addressing source and destination 18 antenna connection 15 B Balance 48 base station unique requirements 18 C carrier sense multiple access See configuration preparation 17 prerequisites 17 procedures 29 Contention 35 Continue 30 CSMA 26 Data Bits 33 Data Rate 26 35 DCD Mode 27 33 DCD time 27 DCD232 Submenu 41 Deviation 48 diagnostics 47 Diagnostics Menu 43 displaying the configuration summary window 31 Download New Software 38 downloading a software upgrade 37 duty cycle 45 E entering programming mode 30 Esc key 31 Exit 30 F factory default parameters 28 51 file management procedures 37 Flow2. 41 Appendix A Diagnosing and Correcting Performance 38 Setting the Power Value enel eee eeu 38 Setting the Frequency Trim includes setting 42 Setting the Deviation and 2 2 2 444 0 0022222 42 Setting the Receive eo 41 Appendix B Factory Default 41 lueret E PD 42 RF Neulink 4 NL5500 User Guide 1 Product Overview The RF Neulink NL5500 is an integrated radio modem that provides reliable bi directional RS 232 data transmissions on a land mobile radio channel Configurable RS 232 radio and packet data parameters provide the NL5500 with the flexibility necessary for use in both simple and complex networks In its simplest configuration the NL5500 transmits wireless data from one modem to another to send instructions and receive a response In many cases the factory configured default parameters make the unit ready to use after just setting two address IDs Figure 1 shows a simple system to transmit data between two terminals NL6000 Figure 1 Use the NL5500 in a Simple Configuration In a more sophisticated configuration the NL5500 provides wireless communication between multiple units in a
3. 22 5 6 4 Pre and Post Data DCD 22 5 7 Planning the RF Channel NIU eee 22 5 8 Factory Default Parameters insists delet 22 PIOOBdHIes aa seta Ru er CU bec ob esee quas dpa eRe ganna ebur 23 6 1 General Procedures Rer cetab ora ua aree tacere uci 24 Entering Programming 24 Setting the Program 24 Saving Configuration Changes to Flash 24 Saving Configuration Changes Temporarily 24 Reverting to the Prior Configuration 24 Returning to the Previous Menu 5 52 22 nnne nnne nnn nnns 25 Displaying the Configuration Summary Window 25 6 2 Radio Network oreet eee panno nona nno raa nen 26 Setting the Umt TVS Term 26 Setting the Unit ID IM VID 26 Setting the Target Unit ID TOID eene tnnt 26 Setting the Active Channel m d 26 Setting the Receive 26 Setting the Transmit Frequency 26 RF Neulink 3 NL5500 User Guide 6 9 Serial Connec
4. Wireless Modem rfaculink NL5500 d Dat PWR do NL5500 User Manual Rev 1 0 DIVISION OF RF INDUSTRIES WWW RFNEULINK COM Copyright Copyright 2003 by RF Neulink This manual may be reproduced for distribution with the NL5500 as long as the manual remains intact in its entirety with all appropriate Copyright Intellectual property and Trademark notices This product contains intellectual property and copyrighted material owned by RF Neulink Unless expressly agreed to in writing no one may copy disassemble or distribute in any form any computer readable information contained within this product and in particular information contained within the EEPROM EPROM or ROM memory circuits All rights title and copyrights to the software or firmware in this product are owned by RF Neulink NL5500 is a registered trademark of RF Neulink a division of RF Industries RF Neulink reserves all rights not expressly granted to the purchaser of this product Notice The information in this document is subject to change without notice RF Neulink 7610 Miramar Road San Diego CA 92126 858 548 6340 rfneulink rfindustries com www rfneulink com 5 1x Product Overview e So RE i 6 Ti ee T 7 2 Regulatory Anecd rc cem 9 Bux cs lelecien Missed 11 4 Hardware Installation and O
5. Frequency control PLL synthesizer Error control 3 data transmission modes provide progressively increasing error correction strength RF Neulink 9 NL5500 User Guide UHF RADIO SPECIFICATIONS Model Numbers NL5500 Transmission frequencies 450 470 MHz amp 400 420 MHz Current Drain at 12 V IDLE radio channel 0 2 amps Receive 0 2 amps Transmit 0 5 watts 1 0 amps Transmit 1 0 watts 1 2 amps Transmit 2 0 watts 1 6 amps Transmit 3 0 watts 1 9 amps Transmit 4 0 watts 2 2 amps Transmit 5 0 watts 2 6 amps Transmit 6 0 watts 3 1 amps Transmitter RF power 1 to 6 watts Modulation 4 FSK with spectral precoder Frequency stability 1 5 ppm Channel spacing 12 5 kHz narrow 25 kHz wide Channel step size 6 25 kHz UHF Duty cycle 5 to 75 depending upon voltage power level and ambient temperature RF load impedance 50 ohms Receiver Sensitivity 9596 reliability 500 user data bytes per packet Basic Telemetry Mode 109 dBm Enhanced Telemetry Mode 115 dBm Mobile Data Mode 115 dBm Selectivity 60dB min narrow 70dB min wide Intermodulation TOdB min 50 ohms RF input impedance RF Neulink 10 NL5500 User Guide VHF RADIO SPECIFICATIONS Model Numbers NL5500 VHF 148 174 MHz NL5500 VHF1 136 162 MHz Transmission frequencies 136 162 M
6. RF Data Rate The NL5500 can transmit or receive at over the air rates of 12 000 bps within narrowband or 22 050 bps within wideband channels Protocol Flexibility The NL5500 provides three data transmission modes resulting in peak system performance for a wide range of data communication scenarios Easy Use Interface An easy to follow menu based user interface makes configuring the NL5500 a simple task Base Station Configuration The NL5500 can be configured as a remote or a base station A remote transmits data to a specific unit or group of units A base station transmits data to multiple units or groups Repeater Configuration Using an NL6000 In areas where you lack a reliable path you can use an NL6000 unit as a repeater to reach a hidden unit This can fill in RF blind spots or extend the usable range of the system s desired coverage area RF Neulink 6 NL5500 User Guide Single and Multi Point Addressing Acknowledgement Auto Transmit RF Neulink An NL5500 can be configured to transmit to a single unit a group of units or to broadcast to all units within range The NL5500 can be configured to request an acknowledgement ACK from the destination modem with each transmission If it does not receive an ACK the unit can retransmit a specified number of times The NL5500 will automatically trigger transmission of data over the RF link The NL5500 will wait for characters to arrive via the serial port in order to c
7. 33 the contention option 35 the data bits 33 the data rate 35 the DCD mode 33 the flow control option 33 the maximum packet size 34 the packet mode 34 the post data DCD time 34 the pre data DCD time 34 the program mode 30 the receive frequency 32 the repeater transmit channel 37 the repeater transmit delay 37 the repeater trigger 36 the repeater trigger ID 37 the request ACKs option 35 the stop bits 33 the target unit ID 32 the transmit character timeout 33 the transmit frequency 32 the unit ID 32 the unit type 32 setting the maximum retries option 35 specifications 11 Stop Bits 33 Summary window 31 40 support technical 16 T TOID 32 transmission mode See packet mode Transmit Channel 37 Transmit Character Timeout 33 Transmit Delay 22 37 Transmit Frequency for Active Channel 32 Trigger 36 troubleshooting 45 U Unit Type 32 NL5500 User Guide
8. 1 11711 44 0 31 7 Menu Quick Referee si cada Seco dd tah ete ees 32 MaN ea det estas al ideae eo 32 7 2 Summary VOW aree cette tetas tud m pa dec LI LEE 32 722 Seal oo Pbi raten 33 fA DCD232 SuD Merntu theta eto etd 33 FeO INGIWORK erm 34 1 6 Radio Menus hal oui 34 L Diagnostics kd recti ati 35 7 8 Save Restore Parameters Menwu oci 35 B Other Considerations coc uec 36 GEIS Stute ocean eae 40 8 2 Troubleshooting oiseau di ou acta aie 40 8 2 1 Use a Good Antenria uere ied Rep ode a RR I Res td ee 40 8 2 2 Three wire Interface 2222211212121 40 8 2 3 Hardware Flow Cond 3 oon 40 8 2 4 Use a Fully Wired RS 232 41 8 2 5 Slower Baud RAC scri oe 41 8 2 6 Use a Faster Baud Ralte o 41 8 2 7 Unit Does Not Enter Programming
9. Size A larger packet size can compensate for the lower percentage of user data in each packet and provide good throughput on a corrupt channel Why not use Basic Telemetry Mode for this scenario Basic Telemetry mode is not useful when you expect a corrupt channel because it uses error detection only Basic Telemetry mode cannot recover data errors so throughput would be poor Why not use Enhanced Telemetry Mode for this scenario Enhanced Telemetry mode provides error correction but if both the signal strength and path are poor you might need to reduce the Maximum Packet Size to increase reliability With Mobile Data mode you can increase the Maximum Packet Size and get better throughput on a very corrupt channel Maximum Packet Size The NL5500 transmits a data packet on the radio channel when the amount of data in the input buffer is equal to the Maximum Packet Size or when there is a timeout on the serial port The maximum packet size is the largest amount of user data in one RF packet Over the Air Data Rates The NL5500 supports two over the air data rates 12 000 bps or 22 050 bps Select the data rate you want to use depending upon the bandwidth you occupy and your license 20 NL5500 User Guide 5 5 4 5 5 5 5 6 5 6 1 5 6 2 Neulink Acknowledgements The NL5500 can request an acknowledgement ACK from the destination modem with each transmission If this option is enabled the unit retransmit a
10. may fill up and lose data Lower the NL5500 s baud rate and the host device baud rate to as slow as practical Use a Faster Baud Rate If system time outs caused by a remote site not responding fast enough are a problem you may consider increasing the serial baud rate at both ends of the radio link High baud rates along with hardware flow control should yield a fast reliable system Unit Does Not Enter Programming Mode If you forget what baud rate the NL5500 is set to you will not be able to get into the programming mode with the command without trying all baud rates on your terminal Instead if you enter three break characters within 10 seconds on the terminal the modem goes into programming mode at 9600 baud From this point you can reset the baud rate with the Baud Rate parameter on the Serial menu Make sure you use a cable that connects RTS and CTS from the modem to the computer not just RX and TX You need this cable connection before trying the three break characters that enter programming mode 37 NL5500 User Guide Appendix A Diagnosing Correcting Performance Problems Factory technicians use the procedures in this section for initial modem alignment After installation a qualified electronic technician can use these procedures to diagnose and correct performance problems Only an electronic technician with training in RF radio alignment should perform these procedures Always perform these proce
11. modem 1 2 From the terminal emulator enter programming mode Enable the Receive Diagnostic Mode as follows Select Diagnostics 7 Receive Diagnostic Mode e Select 1 Enable e Press ESC twice to return to the Main Menu e Select Exit to save the Receive Diagnostic Mode setting and enter operating mode Set up another modem to send data to the modem The terminal emulator will display the receive level correction value Make note of this value 4 From the terminal emulator enter programming mode 5 Set the receive gain level as follows e Select Diagnostics 7 Receive Gain e Enter the receive level correction value using the 1 Increase Gain 0 25 dB or 2 Decrease Gain 0 25 dB options e Press ESC twice to return to the Main Menu e Select Exit to save the Receive Gain value and enter operating mode Repeat steps 3 5 to ensure the receive level remains near zero 0 5 dB after your correction Disable the Receive Diagnostic Mode as follows e Select Diagnostics Receive Diagnostic Mode e Select 2 Disable 40 NL5500 User Guide e Press ESC twice to return to the Main Menu Select Exit to save the Receive Diagnostic Mode setting and enter operating mode Appendix B Factory Default Parameters The following chart lists the default values set for each parameter at the factory Use the last column to record any custom values you need to set
12. network A unit configured as a base station can transmit instructions to multiple remote units and collect responses from those remotes for analysis and management reporting Configuration of multiple units is a simple task using the menu driven user interface Figure 2 shows a system for maintaining the N Water Tank 1 eport Water Level Remote 7 ECC Instruct New Level Water Tank 2 Figure 2 Use the NL5500 in a Multi Unit Network RF Neulink 5 NL5500 User Guide The NL5500 s powerful and efficient packet communications protocol provides a solution to many of the problems affecting conventional wireless data networks Bursts of noise RF interference inter modulation overload and signal fade can corrupt and interrupt radio data links The NL5500 eliminates these problems through the use of advanced technologies including sophisticated forward error correction technology The NL5500 can transmit in any of the following frequency ranges e VHF 136 162 MHz e VHF 148 174 MHz e VHF 216 235 MHz e UHF 400 420 MHz e UHF 450 470 MHz 1 1 Features The following list highlights the primary features of the NL5500 Product Reliability The NL5500 makes extensive use of Digital Signal Processing DSP technology resulting in outstanding performance under adverse environmental conditions Data Reliability Advanced signaling and control technologies provide exceptional performance under poor channel conditions
13. time press ESC When you press Y the system erases the current parameter file in flash memory When the system prompts you to send the parameter file initiate the restore using the terminal emulator If you use Procomm use the Send ASCII Text option If you use HyperTerminal use the Send Text File option A success message appears when the restore is complete When the download is complete cycle power to let the modem start using the new parameter settings Press ESC to continue using the Save Restore Parameters menu Restoring Default Parameters Use the following procedure to restore factory delivered default parameter settings to the unit currently attached to the serial port 1 Select Save Restore Parameters 7 Restore Default Parameters The system prompts you to confirm that you want to restore the default parameter settings Press Y to confirm that you want to restore the default settings If you do not want to restore default settings at this time press ESC When you press Y the system erases the parameter file in flash memory and restores the default settings A success message appears when the restore is complete When the download is complete cycle power to let the modem start using the new parameter settings Press ESC to continue using the Save Restore Parameters menu 31 NL5500 User Guide 7 Menu Quick Reference 7 1 Main Menu NL5500 HyperTerminal xi File Edit View Call Trans
14. to the Maximum Packet Size Flow Control Prior to configuration of the NL5500 determine if you want to use flow control to prevent the serial device or modem from overflowing its buffer If flow control is desired two types are available RTS CTS and XON XOFF With RTS CTS the modem monitors the RTS signal to determine when to send data to the serial device In addition the modem asserts CTS when the modem is ready to accept data from the serial device RTS CTS is the preferred method of flow control but it requires separate lines for RTS and CTS If you cannot use hardware flow control you may use the XON XOFF software option for flow control This option may only be used for ASCII data and requires the use of special characters to identify when it is OK to send receive data to from the serial device 21 NL5500 User Guide 5 6 3 5 6 4 5 7 5 8 Neulink DCD Mode DCD Mode parameter identifies how the device interprets the current state of the modem using the DCD line between the device and the modem If the mode is set to Enable the modem asserts the DCD line when it is receiving data over the air If the mode is set to Disable the modem asserts the line when it is in a normal operating state and negates the line when it is in a programming state If the mode is set to DCD 232 certain I O devices wake up when the DCD signal is asserted and turn off when the signal is negated Pre an
15. when using Basic Telemetry mode use a smaller Maximum Packet Size so that you lose very little user data if an error does occur In this situation smaller packets have a better chance of getting through Why not use Enhanced Telemetry Mode or Mobile Data Mode for this scenario If the channel is clean and the signal is strong there is no need to use a mode that reduces the percentage of user data in each packet Scenario 2 Description You have average signal strength or a less reliable path between the radio modem units You expect occasional corruption on the radio data link from noise bursts RF interference or signal fading Best Choice Enhanced Telemetry Mode Because you expect the channel to have occasional corruption use Enhanced Telemetry mode In addition to error detection Enhanced Telemetry mode uses Reed Solomon forward error correction for increased transmission reliability This mode requires more overhead than Basic Telemetry mode and lowers the percentage of user data in each packet However because you are less likely to lose data with Enhanced Telemetry mode than with Basic Telemetry mode you can use a larger Maximum Packet Size A larger packet size can compensate for the lower percentage of user data in each packet and provide good throughput on an occasionally corrupt channel Why not use Basic Telemetry Mode for this scenario Basic Telemetry mode is not useful when you expect a corrupt channel because a sin
16. Control 27 33 Frequency Trim 47 RF Neulink Index 42 H hardware installation 13 ID 37 L LEDs 15 M Main Menu 40 Max Packet Size 25 34 Max Retries 26 35 menu windows 40 MYID 32 N Network Menu 42 NL5500 product overview 6 specifications 11 O operation 15 P packet mode Basic Telemetry 24 considerations 23 description of types 23 Enhanced Telemetry 24 Mobile Data 25 Packet Mode 34 parts description 13 performance problems correcting 47 diagnosing 47 Post Data DCD Time 34 power connections 13 power output and duty cycle 45 NL5500 User Guide Power value 47 Pre Data DCD Time 34 procedures 29 Program Mode 30 R Radio Menu 43 Receive Frequency for Active Channel 32 Receive Gain 49 regulatory information 9 Request ACKs 35 Restart 30 Restore Default Parameters 39 Restore Parameters from Disk 39 restoring default parameters 39 parameters from disk 38 returning to the previous menu 31 reverting to the prior configuration 30 RF channel planning 28 S safety warnings 9 Save Parameters to Disk 38 Save Restore Parameters Menu 44 saving configuration changes temporarily 30 configuration changes to flash 30 parameters to disk 38 Select Repeater Entry 36 selecting the repeater entry to edit 36 Serial Menu 41 serial parameters basic 26 RF Neulink 43 serial port connector 13 setting the active channel 32 the baud rate
17. F interference and fading expected on the radio channel Movement of the unit or movement of its surroundings Each transmission mode is designed to provide a different level of error control The level of error control influences the optimum packet size that will produce the desired throughput Use the scenarios on the next page to help determine which Transmission Mode and Maximum Packet Size is best for a unit Note If you are not sure which mode to use use Enhanced Telemetry mode You can configure the transmission mode and packet size parameters differently for each unit in the network All transmission modes share a common mode field as part of the packet This field allows the receiving modem to determine the mode prior to decoding a received message 18 NL5500 User Guide Neulink Scenario 1 Description You have above average signal strength and reliable path between the radio modem units You do not expect noise bursts RF interference or signal fading to corrupt the radio data link Best Choice Basic Telemetry Mode Because you have a clean channel use the mode that uses the least overhead for each packet Basic Telemetry mode uses error detection only so it contains the least amount of overhead and the highest percentage of user data in each packet Basic Telemetry mode provides the highest throughput on a clean channel However if there is a transmission error you will lose the entire packet Therefore
18. Hz 148 174 MHz Current Drain at 12 V IDLE radio channel 0 2 amps Receive 0 2 amps Transmit 0 5 watts 1 0 amps Transmit 1 0 watts 1 3 amps Transmit 2 0 watts 1 7 amps Transmit 3 0 watts 2 1 amps Transmit 4 0 watts 2 4 amps Transmit 5 0 watts 2 6 amps Transmit 6 0 watts 2 8 amps Transmitter RF power 1 to 6 watts Modulation 4 FSK with spectral pre coder Frequency stability 1 5 ppm Channel spacing 12 5 kHz narrow 25 kHz wide Channel step size 2 5 kHz VHF Duty cycle 5 to 7596 depending upon voltage power level and ambient temperature RF load impedance 50 ohms Receiver Sensitivity 9596 reliability 500 user data bytes per packet Basic Telemetry Mode 106 dBm Enhanced Telemetry Mode 112 dBm Mobile Data Mode 112 dBm RF input impedance Selectivity 60dB min narrow 70dB min wide Intermodulation 70dB min 50 ohms RF Neulink 11 NL5500 User Guide 4 Hardware Installation and Operation 4 1 Parts Description an 1 5500 Figure 3 Parts Description of the NL5500 Pat Description 3 1 Antena Connector 2 TXRxLED 3 Power Connector 4 66 Serial Port DB9 Connector LY 4 2 Power Connections Connect a 12 VDC power supply to the power connector to provide power to the NL5500 Note If you
19. NEL MHz TRANSMIT FREQUENCY FOR ACTIVE CHANNEL MHz PRESS ESC TO GO BACK OR PLEASE ENTER YOUR SELECTIONs_ RF Neulink 34 NL5500 User Guide 7 7 Diagnostics Menu NL5500 HyperTerminal nTINUOUS RANDOM DATA SQUARE WAVE TOME 604 RATED DEVIATION amp c cm mmm HHH N GNOSTIC MODE Your current selection of Diagnostics 1 Press Esc to bac Or enter 1 A for new selection of Diagnostics a SAVE PARAMETERS TO DISK RESTORE PARAMETERS FROM DISK RESTORE DEFAULT PARAMETERS PRESS ESC TO GO BACK OR PLEASE ENTER YOUR SELECTIONs_ RF Neulink 35 NL5500 User Guide 8 Other Considerations 8 1 8 2 RF Neulink Duty Cycle When the NL5500 transmits data it generates heat and the case gets warm If the NL5500 is forced to transmit large amounts of data without a cooling off period damage due to excessive temperature can result There are two considerations first limit data transmission time so that the unit will not overheat Second limit the duty cycle of data transmission When operated in still air the limits in Table 4 apply Power Output Temperature Duty Cycle Maximum Data Transmission ew 25 30 15 Seconds ew 60 5 5 Seconds 25 C 50 20 Seconds 60 5 5 Seconds 1W 25 C 75 30 Seconds 1W 60 10 5 Seconds Table 4 Duty Cycle and Transmission Limits The limits above can be incr
20. acket mode Setting the Data Rate 1 Select Network 7 Data Rate 2 Select the data rate you want to use depending upon the bandwidth you occupy and your licenses The available options are 12 000 bps and 22 050 bps Setting the Request ACKs Option 1 Select Network 7 Request ACKs 2 Select from the following options 1 Enable When the modem sends data it requests an ACK from the destination modem If it does not receive an ACK the modem will retransmit up to the number of times you specify in the Max Retries option 2 Disable When the modem sends data it does not request an ACK from the destination modem Setting the Contention Option 1 Select Network 7 Contention 2 Select from the following options 1 None Do not use contention to determine when to transmit 2 CSMA Enable Carrier Sense Multiple Access CSMA so that transmission waits until the channel is free of contention This option is helpful if a unit s transmit and receive frequencies are the same Setting the Max Retries Option You only need to set this parameter if the Request ACKs option is enabled The system ignores this parameter if it is disabled 1 Select Network 7 Max Retries 2 Enter the greatest number of times you want to retransmit if you do not receive response The value must be in the range 1 9 File Management Downloading a Software Upgrade The software that runs the NL5500 is stored in flash memory There is room in the
21. cy 2 From the terminal emulator enter programming mode 3 Select the active channel for the radio as follows e Select Radio 7 Select Active Channel RF Neulink 38 NL5500 User Guide Enter the active channel assignment for the radio The value must be a number in the range 01 64 Press ESC to return to the Main Menu 4 Select Diagnostics 7 Transmit Continuous Random Data 5 Set the power value as follows Select Power from the Diagnostics menu While watching the power gauge change the power value and check the gauge to see that the power value registers correctly The value must be a number in the range 0 1023 Press ESC to return to the Diagnostics menu 6 Set the frequency trim as follows Select Frequency Trim from the Diagnostics menu While watching the Frequency Error gauge on the IFR change the frequency trim value on the Frequency Trim window until the needle on the gauge is centered 7 Select None from the Diagnostics menu to stop the data transmission Setting the Deviation and Balance RF Neulink To properly set the deviation and balance you must perform the following procedure twice once near each edge of the transmit frequency band In this procedure an edge is defined as approximately 2 5 MHz from one end of the band range 1 From the terminal emulator enter programming mode 2 Select one edge of the transmit frequency as follows Select Radio Transmit Frequency fo
22. d Post Data DCD Time Two additional parameters Pre Data DCD Time and Post Data DCD Time must be set when using the DCD 232 option The pre data time value sets the number of milliseconds it takes for the device to wake up after the modem asserts the line The post data time value sets the number of milliseconds it takes for the device to turn off after the modem negates the line These settings ensure the modem does not transmit data unless the device is ready Figure 16 illustrates the pre and post DCD time periods Pre DCD Post DCD Time Time Rx Data User Data from Modem Figure 16 Pre and Post DCD Time Planning the RF Channel For each unit in the network plan you must specify the active channel as well as receive and transmit frequencies used on that channel Determine these radio parameters as part of your network plan Each NL5500 unit arrives from the factory tuned and tested on the default frequency appropriate for that unit Retuning requires that a qualified radio technician use the procedures in Appendix A Diagnosing and Correcting Performance Problems Factory Default Parameters Appendix B provides a list of the default parameters set for each NL5500 unit at the factory It also provides a blank column for you to record any custom values you want to set 22 NL5500 User Guide 6 Procedures This section includes step by step procedures for configuring all the parameters that control the operati
23. dures using calibrated test equipment Use the following test equipment for these procedures e A calibrated service monitor IFR capable of generating and analyzing narrow band FM signals in the frequency band of the radio being tested DC power supply capable of supplying at least 1 amp of current at 10 12V DC A computer terminal capable of 9600 Baud wired as a DTE e Acable to connect the modem antenna output to the connector on the IFR Setting the Power Value 1 Set the IFR to receive at the radio s transmit frequency 2 From the terminal emulator enter programming mode 3 Select the active channel for the radio as follows e Select Radio 7 Select Active Channel Enter the active channel assignment for the radio The value must be a number in the range 01 64 Press ESC to return to the Main Menu 4 Select Diagnostics 7 Transmit Continuous Random Data 5 Set the power value as follows Select Power from the Diagnostics menu e While watching the power gauge change the power value and check the gauge to see that the power value registers correctly The value must be a number in the range 0 1023 6 Select None from the Diagnostics menu to stop the data transmission Setting the Frequency Trim includes setting Power The power setting affects the frequency trim in the NL5500 so part of setting the frequency trim is setting the power 1 Set the IFR to receive at the radio s transmit frequen
24. e is Remote The system ignores this parameter if the Unit Type is Base 1 Select Network 7 TOID 2 Enter the destination address for packets from this unit The destination address is the MYID of the unit for which the data is intended The value must be a hexadecimal value in the range 0000 FFFF For more information about addressing and wildcards refer to Section 5 4 Setting the Active Channel 1 Select Radio 7 Select Active Channel 2 Enter the channel assignment for this unit The value must be a number in the range 01 64 Setting the Receive Frequency 1 Select Radio 7 Receive Frequency for Active Channel 2 Enter the receive frequency for the active radio channel in MHz The value must be a number in the format nnn nnnn Setting the Transmit Frequency 1 Select Radio 7 Transmit Frequency for Active Channel 2 Enter the transmit frequency for the active radio channel in MHz The value must be a number in the format nnn nnnn 26 NL5500 User Guide 6 3 Serial Connection Setup RF Neulink Setting the Baud Rate 1 Select Serial 4 Baud Rate 2 Select a baud rate for the connection between the modem and device The options range from 1200 to 38400 Setting the Data Bits 1 Select Serial Data Bits 2 Select the number of data bits per byte sent from the I O device The options are 7 or 8 bits per byte Setting the Stop Bits 1 Select Serial 7 Stop Bits 2 Select the number of number of bits us
25. e modem This causes the modem to use the new software build Press ESC to continue using the Main Menu Saving Parameters to Disk If you want to duplicate parameter values on several NL5500 units you can save the settings to disk and restore them to multiple units Use the following procedure to save parameter values from the unit currently attached to the serial port 1 2 Select Save Restore Parameters 7 Save Parameters to Disk Using Procomm or HyperTerminal open the file where you want to save the parameters Press Y to confirm that you want to save parameters If you do not want to save parameters at this time press ESC Wait until the output to the terminal emulator stops You will see a checksum at the end Stop the text capture function on the terminal emulator and close the file Press ESC to continue using the Save Restore Parameters menu 30 NL5500 User Guide Neulink Restoring Parameters from Disk If you want to duplicate parameter values on several NL5500 units you can save the settings to disk and restore them to multiple units Use the following procedure to restore saved parameter settings to the unit currently attached to the serial port 6 Select Save Restore Parameters 7 Restore Parameters from Disk Using Procomm or HyperTerminal open the file that holds the parameter settings Press Y to confirm that you want to restore parameters If you do not want to restore parameters at this
26. eased significantly by placing heat sinks on the unit and or cooling with forced air Troubleshooting 8 2 1 Use a Good Antenna The antenna is the most important but often ignored part of the communication system A good antenna system will increase range increase throughput and increase reliability You can use directional gain antennas when operating in a point to point configuration 8 2 2 Three wire Interface When using a three wire RS232 interface TX TX GND you must disable RTS CTS flow control You may enable the XON XOFF protocol if software flow control is required Refer to Section 5 7 2 8 2 3 Hardware Flow Control Many programs disable the use of hardware data flow control signals If this is the case the RTS CTS flow control must be disabled To ensure that the NL5500 s internal data buffers do not overflow you may use the XON XOFF flow control Refer to section 5 7 2 36 NL5500 User Guide Neulink 8 2 7 Use Fully Wired RS 232 Cable Some RS 232 cables especially those hand made may not have all of the flow control wires connected If your application supports hardware flow control RTS CTS then ensure that the cable connecting the NL5500 to the host device has all of the wires connected Refer to section 4 3 Use a Slower Baud Rate If the input baud rate is higher than the over the air bit rate long strings of data are going into the serial port and flow control is not used the NL5500 buffers
27. ed to designate the end of a byte The options are 1 or 2 bits Setting the Transmit Character Timeout 1 Select Serial 7 Transmit Character Timeout 2 Enter the expected pause between data strings through the serial port The value must be in the range 10 9999 milliseconds Setting the Flow Control Option 1 Select Serial 7 Flow Control 2 Select from the following options 1 None Do not use flow control 2 RTS CTS Monitor the Ready To Send RTS signal to determine when to send data to the serial device and assert CTS to tell the serial device when it can send data to the modem 3 XON XOFF Use special ASCII characters to determine when to send receive data to from the serial device Setting the DCD Mode 1 Select Serial 7 DCD Mode 2 Select from the following options 1 Enable In this mode the modem asserts the DCD line when it is receiving data over the air 2 Disable In this mode the modem asserts the line when it is in a normal operating state and negates the line when it is in a programming state 27 NL5500 User Guide 6 4 Neulink 3 DCD 232 this mode certain I O devices can wake up when the DCD signal is asserted and turn off when the signal is negated If you select this option the DCD 232 menu appears for you to set the Pre Data DCD Time and Post Data DCD Time Setting the Pre Data DCD Time 1 Select Serial DCD Mode 7 Pre Data DCD Time 2 Enter the number of milliseconds it takes
28. eiving or transmitting Pwr Amber Blinking Powered on None Powered off Table 1 NL5500 LEDs Note If the Rx LED is continuously green this means an open squelch or interference problem exists that will inhibit transmissions RF Neulink 14 NL5500 User Guide 4 6 Operation It is the responsibility of the user to obtain the proper FCC license to operate this product on the desired channel of operation The NL5500 comes factory configured for the broadcast mode of operation and tuned and tested on the default frequency of 464 550 MHz UHF 154 6000 MHz VHF and 221 5 MHz for the 216 235 MHz band The NL5500 operates automatically after you properly install the physical units and configure the software parameters In most networks with more than two units you must set the MYID and TOID parameters before operation Sections 5 and 6 discuss the available software parameters and the procedures for setting them 4 7 Technical Support Telephone support is available Monday through Friday 7 00 am to 4 00 pm Pacific Time at 858 549 6340 Software Configuration 5 1 Prerequisites To configure the NL5500 you must connect a computer to the RS232 port and run a terminal emulator such as HyperTerminal or ProComm 5 2 Preparation Plan the network before configuring the parameters that control each individual unit The network plan must address the following questions e Whatis the location of each unit in
29. f powering on the unit Open HyperTerminal or Procomm 2 Type The Main Menu opens Setting the Program Mode The Program Mode parameter determines when the operator can enter programming mode from operational mode 1 Select Serial 7 Program Mode 2 Select from the following options 1 Disabled Enter programming mode within five seconds of power on Select this option under normal operating conditions to prevent accidental resetting of parameters 2 Enabled Enter programming mode whenever you type the key sequence There must be a pause before and after the sequence Select this option during factory configuration or during initial configuration of a unit Saving Configuration Changes to Flash Memory Select E Exit from the Main Menu to save the updated parameter settings to the unit s flash memory The unit immediately begins using the new configuration Saving Configuration Changes Temporarily Select C Continue from the Main Menu to temporarily save the updated settings for the current operating session The configuration is not saved to flash memory You can revert to the prior configuration by cycling power to the unit Reverting to the Prior Configuration Select R Restart from the Main Menu to ignore the changes you made and revert back to the prior configuration 24 NL5500 User Guide Returning to the Previous Menu Press the ESC key at any time to return to the previous menu The changes you
30. fer Help Dis 918 cs 2 4 5 ENTER YOUR SELECTIONs Connected 0 24 40 Auto detect 9600 8 N 1 SCROLL CAPS NUM Capture 2 7 2 Summary Window NL5500 HyperTerminal Iof x Fie Edi View Call Transfer Help 918 cla l aa n amp REHOTE TIMEOUT Sae NSEC DCO MODE FLOW CONTROL NONE Fes K i DIAGNOSTICS DATA 12 POWER 500 CONTENTION CSMA DEVIATION 1 66 BALANCE 1 125 DB REPEATER trigger id ch delay FREQUENCY TRIM 819 RECEIVE GAIN 0 75 T jm nl ms Oe D D ul 5 C 1 CHANNEL 33 FREQ 149 8588 MHZ TM FREQ 149 8588 MHZ Version 1 2 65 68 83 1 2 3 4 5 8 Connected 0 25 15 uto detect 3600 8 N 1 SCROLL CAPS NUM Capture 2 22 NL5500 User Guide 7 3 Serial Menu NL5500 HyperTerminal ala ols i BAUD RATE DATA BITS STOP BITS CHAR TIMEOUT FLOW CONTROL OCD MODE PROGRAMMING MODE PRESS ESC TO GO BACK OR PLEASE ENTER YOUR SELECTION _ 7 4 RS 232 SubMenu NL5500 HyperTerminal ala ola 1 PRE DATA DCD TIME 2 POST DATA DCD TIME PRESS ESC TO GO BACK OR PLEASE ENTER YOUR SELECTIONs__ RF Neulink 33 NL5500 User Guide 7 5 Network Menu 5500 HyperTerminal SONAR ONS SELECT ACTIVE CHANNEL RECEIVE FREQUENCY FOR ACTIVE CHAN
31. flash memory for two software versions This allows you to keep the current software version while you download a new version If the download is not valid the unit can still run on the older version 29 NL5500 User Guide Neulink The NL5500 can determine if the new download is complete and valid system uses a checksum function to determine if the download is valid If the download is corrupt the system continues to use the older version If the download is valid the modem switches over to use the upgrade when you cycle power 1 2 Ensure you have access to the NL5500 software upgrade files From the Main Menu select Download New Software The Download New Software window opens Press Y to continue with the software download If you do not want to initiate the download at this time press ESC There is a delay while the system erases the flash to prepare for the download When the system prompts you to send the DSP build initiate the download from the terminal emulator e f you use Procomm use the Send ASCII Text option f you use HyperTerminal use the Send Text File option A message appears with the estimated download time The estimate is based upon the time it takes using Procomm If you use HyperTerminal the download may take longer A countdown message shows the progress of the download A success message appears when the download is complete When the download is complete cycle power to reset th
32. for the device to wake up after the modem asserts the line The value must be a 3 digit number The post data time value sets the number of milliseconds it takes for the device to turn off after the modem negates the line Setting the Post Data DCD Time 1 Select Serial 7 DCD Mode Post Data DCD Time 2 Enter the number of milliseconds it takes for the device to turn off after the modem negates the line The value must be a 3 digit number Data Setup Setting the Maximum Packet Size 1 Select Network 7 Max Packet Size 2 Enter the largest amount of continuous bytes of user data you expect in a single transmission The value must be in the range 1 1023 Note The Packet Mode affects how much user data can be in a packet For Enhanced Telemetry and Mobile Data modes the maximum will be less than 1023 due to memory constraints The Max Packet Size window displays the actual value for these two modes Setting the Packet Mode 1 Select Network 7 Packet Mode 2 Select from the following options 1 Basic Telemetry This mode uses a simple Cyclic Redundancy Check for error detection 2 Enhanced Telemetry This mode is similar to Basic Telemetry mode but it includes Reed Solomon forward error correction 3 Mobile Data This mode uses forward error correction and a block interleaver for maximum transmission reliability 28 NL5500 User Guide 6 5 Neulink Refer to Section 5 6 1 for more information about each p
33. gle transmission error will cause a packet failure Lost packets will degrade throughput Basic Telemetry mode cannot recover data errors so throughput would be poor Why not use Mobile Data Mode for this scenario Mobile Data mode requires that the interleaver be filled for each packet If the data packets are 19 NL5500 User Guide 5 5 2 5 5 3 Neulink smaller than the interleaver size throughput will suffer because the interleaver is filled prior to transmission Since fading is not a big issue in this scenario the interleaver is not necessary Scenario 3 Description You have fluctuating signal strength and a less reliable path between the radio modem units You expect noise bursts RF interference or signal fading to corrupt the radio data link The remote unit is moving or it is located in an area where the surroundings are moving such as a busy street Best Choice Mobile Data Mode Because you expect a corrupt channel use the mode that has the greatest amount of error control Mobile Data mode includes three types of error control Reed Solomon forward error correction error detection and a block interleaver This mode provides for maximum transmission reliability on a corrupt channel Since the packet size is large any data added to the packet to fill the interleaver is insignificant Because you are more likely to recover from transmission errors with Mobile Data mode you can use a large Maximum Packet
34. made up to that point are saved until you leave the Main Menu using Exit Continue or Restart Displaying the Configuration Summary Window Select 1 Summary from the Main Menu The summary window appears as in Figure 18 NL5500 HyperTerminal olx File Edi Call Transfer Help 19266 N 8 1 TIMEOUT 500 NSEC DCO MODE FLOW CONTROL RTS CTS DIAGNOSTICS m m a 4 m KS M 624 METRY DATA RH 266a BPS CONTENTION CSMA REPEATER trigger id ch del ay 3 i H E Li E 2 4 5 5 ELEME 1 1 9 Cv TRIM 520 GAIN 0 25 DE 1 2 3 4 5 6 t 8 Connected 0 08 02 Auto detect 13200 8 41 SCROLL CAPS NUM Capture 2 Figure 18 Summary Window RF Neulink 25 NL5500 User Guide 6 2 Neulink Radio Network Setup Setting the Unit Type 1 Select Network 7 Unit Type 2 Select from the following options 1 Base Configure as a base station This unit type receives the TOID from the data packet received through the serial port 2 Remote Configure as a remote This unit type receives the TOID from its configuration Setting the Unit ID MYID 1 Select Network MYID 2 Enter a unique identification for the unit The value must be a hexadecimal value between 0001 and FFFE For more information about addressing and wildcards refer to Section 5 4 Setting the Target Unit ID TOID You only need to set this parameter if the Unit Typ
35. of 12FF is a match to destination units 16 NL5500 User Guide with a MYID of 1277 and 1219 TOID of FFFF is a broadcast to all units Figure 8 shows the use of a wildcard 12FF to transmit data to multiple units within range of Unit 1 that have a MYID starting with 12 Unit 1 MYID 2356 TOID 12FF Unit 3 MYID 1206 TOID 2356 Figure 8 Addressing with Wildcards Figure 9 shows the use of a wildcard FFFF to broadcast data to all units within range of Unit 1 Unit 1 Unit 2 MYID 2356 MYID 1205 TOID TOID 2356 Unit 3 Unit 4 MYID 1408 MYID 1103 TOID 2356 TOID 2356 Figure 9 Using Wildcards to Broadcast RF Neulink 17 NL5500 User Guide 5 5 Packet Data Options 5 5 1 Transmission Mode The NL5500 supports the following three packet transmission modes Basic Telemetry mode Table 2 summarizes the characteristics of each transmission mode Basic Telemetry Enhanced Telemetry Mobile Data Mode Mode Mode Spectral Pre coding Yes Yes Yes Randomization Yes Yes Yes CRC Yes Yes Yes FEC NO NA on NL5500 NA on NL5500 Interleaving NO NO NA on NL5500 RF Neulink Table 2 Transmission Mode Characteristics To select the best transmission mode for a unit consider the following factors Signal strength between the unit and its destination unit s Reliability of the path between the unit and its destination unit s Noise R
36. ompletely fill a packet size as defined under Network Max Packet Size before transmitting The typical default setting for TX CHAR TIMEOUT is 100 and MAX PACKET SIZE is 300 This will give you a reasonable response time between serial data arrival and transmitting data The MAX PACKET SIZE should be set based on your applications typical maximum packet size 7 NL5500 User Guide 2 Regulatory Information Notice It is the responsibility of the user of this equipment to obtain the proper FCC license to operate this product on the desired channel of operation FCC Part 15 This product complies with Part 15 of the FCC rules and regulations Code of Federal Regulations 47CFR Part 15 It may not be modified without the expressed consent of RF Modification of this product could void the user s authorization to use the product FCC Part 90 The NL5500 has been type accepted for operation by the FCC in accordance with Part 90 of the FCC rules 47CFR Part 90 See the label on the unit for the specific FCC ID and any other certification designations FCC Part 101 The NL5500 has been type accepted for operation by the FCC in accordance with Part 101 of the FCC rules 47CFR Part 101 See the label on the unit for the specific FCC ID and any other certification designations 406 0 to 406 1 MHz Operation The frequency band from 406 0 to 406 1 MHz is reserved for use by distress beacons As such the NL5500 should not be prog
37. on of the NL5500 The procedures are grouped into the following categories General Procedures Radio Network Setup e Serial Connection Setup e Data Setup e File Management Configuration of the NL5500 parameters is easy using the menu driven user interface When you enter programming mode using the terminal emulator a Main Menu appears The procedures in this section assume you always begin at the Main Menu The Main Menu appears as in Figure 17 NL5500 HyperTerminal x File Edit View Cal Transfer Help D 1 2 2 4 5 Ts C E RESTART ENTER YOUR SELECTION __ Connected 0 13 08 Auto detect 19200 8 N 1 SCROLL CAPS NUM Capture 2 Figure 17 NL5500 Main Menu In most procedures you must enter at least one submenu to perform a task The following text is an example of a step that leads you to the correct submenu option Select Network 7 Unit Type This example means that from the Main Menu you must select the Network option and then select the Unit Type option from the submenu that appears Throughout this section the arrow 7 directs you through a series of submenu options RF Neulink 23 NL5500 User Guide 6 1 Neulink General Procedures Entering Programming Mode Perform this procedure when you need to reset any of the existing configuration parameters for the NL5500 Note If the Programming Mode is Disabled you must perform this procedure within five seconds o
38. packet up to a specified number of times if it does not receive an ACK If it does not receive an ACK after the final retry the unit will transmit the next packet You specify the desired maximum number of retries with the Max Retries option Carrier Sense Multiple Access If a unit s transmit and receive frequencies are the same it may be helpful to enable Carrier Sense Multiple Access CSMA This option does not allow transmission of a packet until the channel is free of contention Serial Connection to an Device Basic Serial Parameters The NL5500 can receive data strings from a variety of I O devices through its RS232 serial port Configure the NL5500 serial port parameters based upon how the I O device will send data to the unit The following is a list of the basic serial parameters you must configure Baud rate This parameter is the data rate between the device the NL5500 modem Set the baud rate to the rate of the device Data bits This parameter is the number of bits the device sends byte The options available are 7 or 8 The NL5500 does not use parity bits e Stop bits This parameter is the number of bits used for the end of a byte The options available are 1 or 2 e Transmit Character Timeout The NL5500 transmits a data packet on the radio channel when there is a timeout on the serial port equal to this value or when the amount of data in the input buffer is equal
39. peration 13 4T SPAMS Description ocio 13 4 2 Power Connections 13 4 3 HORNA so ceciderat 13 AA Antena Connections rociis 15 LR MEE IP m C ETE EMT E EON 15 4 0 Operation Emm 15 4 7 Technical Support 15 5 Software ERE 15 Dirks Prerequisite 16 O22 16 5 3 Unique Data Requirements for a Base Station 16 5 4 Source and Destination Addressing 16 5 5 PacketData Options ice ora UG MENO Mo DRM DR 18 5 5 1 Transmission Mode pite reta oet enu e Per ta ib xe ie Pe vn nel 18 5 5 2 Maximum Packet SIZ ee talenta ba Ce bed at Redi za 20 5 5 3 Over the Air Data qose iit ca Fem delebo 20 2 944 Ackriowledgemierils 21 5 5 5 Carrier Sense Multiple Access 21 5 6 Serial Connection to an I O Device 21 5 6 1 Basic Serial Parameters 5 on nace cer 21 5 60 27 CONTON buta d kn ads 21 5622 BORN OG
40. r Active Channel Enter a frequency that is on one edge of the frequency for the active radio channel The value must be a number in the format nnn nnnn Press ESC to return to the Main Menu 3 Set the IFR to receive at the transmit frequency you set in Step 2 4 Select Diagnostics 7 Transmit 100 Hz Square Wave 5 Set the balance value as follows Select Balance from the Diagnostics menu While watching the square wave on the IFR enter 1 Increase Balance 0 125 dB or 2 Decrease Balance 0 125 dB until the corners of the wave are at a 90 angle Press ESC to return to the Diagnostics menu 6 Select None from the Diagnostics menu to stop the square wave 7 Select Transmit Continuous Random Data from the Diagnostics menu 39 NL5500 User Guide Set the deviation value as follows Select Deviation from the Diagnostics menu e While watching the deviation gauge on the IFR enter 1 Increase Deviation 0 25 dB or 2 Decrease Deviation 0 25 dB until the deviation gauge measures 2 5 kHz for a low data rate or 4 kHz for a high data rate e Press Ctrl A or Ctrl B to save the balance and deviation values as the first or second reference point Press ESC to return to the Diagnostics menu e Select None from the Diagnostics menu to stop the data transmission 10 Repeat Steps 1 7 for the opposite edge Setting the Receive Gain RF Neulink Use this procedure to set the receive packets at the best level for this
41. rammed to transmit on any frequency within this band Caution should be used when programming frequencies into the NL5500 to eliminate the possibility of NL5500 users interfering with rescue operations on this band Safety Warning In order to ensure the safe operation of this radio equipment the following practices should be observed DO NOT operate radio equipment near electrical blasting caps or in an explosive atmosphere DO NOT operate any radio transmitter unless all RF connectors are secure and any open connectors are properly terminated DO NOT allow the antenna to come close to or touch the eyes face any exposed body parts while the radio is transmitting NOT operate the radio unless it has been installed and inspected by a qualified radio technician DO NOT let children operate transmitter equipment RF Neulink 8 NL5500 User Guide 3 Specifications GENERAL SPECIFICATIONS Dimensions 3 0 in L x 2 6 in W x 1 6 in H DC voltage input Nominal 10 15 VDC Operating temperature 30 C to 60 C Number of Channels 64 Number of ID codes 65 525 Over the air Tx data rate 12 000 bps or 22 050 bps Serial port baud rates 1200 bps 2400 bps 4800 bps 9600 bps 19 2 kbps 28 8 kbps 38 4 kbps RF input output connector SMA F Data interface 9 pin DB9 Serial interface RS 232 async Mode of operation Simplex or Half Duplex
42. ssion mode that results in the best performance See Section 5 6 for a description of each transmission mode Unique Data Requirements for a Base Station When configured as a base station there are specific requirements for the data strings sent through the NL5500 s serial port Because a base station is the central point of a network it must be able to selectively transmit to any remote To provide for selective destinations each data string coming into the serial port must begin with a colon followed by four ASCII characters that specify the destination TOID The data string must immediately follow the ASCII characters with no pause between them as in the example ABCD user data Source and Destination Addressing Specify a unique identification number for each NL5500 unit in the network plan This number the MYID references the source of the data packet The TOID is the destination address for the packet so the TOID is the MYID of the unit for which the data is intended Both the MYID and TOID are a hexadecimal value from 0000 to FFFF Figure 7 illustrates point to point addressing Unit 1 Unit 72 MYID 2356 MYID 2401 TOID 2401 TOID 2356 Figure 7 Point to Point Addressing Use the FF character as a wildcard to designate a group of destination units For example a TOID may be FF56 or 42FF A packet sent with a TOID of FF56 is a match to destination units with a MYID of 1256 and 8856 A packet sent with a TOID
43. the network e Which units are remotes and base stations Does the network require any repeaters How many frequencies are available e Which transmission mode should be used You can configure the NL5500 as a remote or a base station A remote is limited to transmitting data to a pre programmed destination A base station can transmit data to any remote using a destination ID specified in the data string it receives from the serial port See Section 5 3 for additional detail on the data requirements for a base station Assign each NL5500 with a unique address MYID If the unit is a remote you also assign a destination address TOID The destination address can be specific to a single unit or can include wildcards for transmitting to a group of units If the unit is a base station the RF Neulink 15 NL5500 User Guide 5 3 5 4 Neulink software determines the TOID from the received data string See Section 5 4 for examples of addressing and wildcards If a reliable path does not exist between a remote unit and a base station you can configure one or more NL6000 units as a repeater to reach the hidden unit The repeater can work with both simplex and half duplex networks NL6000 s are available from your NL5500 supplier You can select from three radio channel transmission modes that provide increasing levels of error control By evaluating the signal strength and path between two modems you can select a transmi
44. tion e uad td 27 Setting th Baud 27 Setting the Data Bits ese 2 ce asa i eet Ma 27 Setting Cre 27 Setting the Transmit Character 27 Setting the Flow Control 22 27 Setting the DCD Modes uoo pb pte 27 Setting the Pre Data DCD Time 1 1 1212 12 2 2 14 treten tnnt nt 28 Setting the Post Data DCD Time e ERE aed 28 0 4 D ta eife 28 Setting the Maximum Packet 5 28 Setting the Packet Mode ner a a oboe uus 28 Setting the Data ooo alee crue dm 29 Setting the Request Option sess 29 Setting the Contention Option 29 Setting the Max Retries men 29 5 5 FileManagement conte eR eee ee 29 Downloading a Software 29 Saving Parameters to DISK nee peu qo eMe eS 30 Restoring Parameters from DISK sts Ia itr bbb beret eds 31 Restoring Default Parameters 2 2 2
45. want to use an external power amplifier contact the RF Neulink sales department RF Neulink 12 NL5500 User Guide 4 3 Serial Port The serial port on the NL5500 is a 9 pin female connector The NL5500 is a Data Communications Equipment DCE device Other equipment that can connect to the NL5500 via the serial port fall into one of the following categories DTE Data Terminal Equipment computers mainframes terminals DCE Data Communications Equipment modems printers other peripherals Connect a DTE device to the DB9 connector with a 9 pin male connector wired one for one as shown in Figure 4 and Figure 5 Connector NLBDL Pin Male Pin Female e 9 9 6 DTE 9 Pin Male on Computer DCE 9 Pin Female 1 5500 Figure 5 Male and Female Connectors with Numbered Pins RF Neulink 13 NL5500 User Guide Connect DCE device to the DB9 connector with null modem cable wired as shown in Figure 6 DTE Connector NLBDD 8 Pin Male 8 Pin Female Figure 6 DTE to DTE Connection 4 4 Antenna Connection You must connect a suitable antenna to the RF antenna connection This antenna is used for both transmitting and receiving over the air messages Caution Do not operate the radio modem without an antenna 4 5 LEDs Table 1 interprets the two LEDs on the NL5500 LED Color Meaning Transmitting Green Receiving a signal on the active channel None Not rec
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