RF-Link Technology NL6000 manual Unique Data Requirements for a Base Station

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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. See Section 5.5 for additional detail on the unique behavior of a repeater unit.

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 transmission mode that results in the best performance. See Section 5.6 for a description of each

transmission mode.

5.3.Unique Data Requirements for a Base Station

When configured as a base station, there are specific requirements for the data strings sent through the NL6000s 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]

5.4.Source and Destination Addressing

Specify a unique identification number for each NL6000 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.

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 of 12FF is a match to destination units with a MYID of 1277 and 1219. A TOID of FFFF is a broadcast to all units.

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NL6000 User Guide

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Contents NL6000 Wireless Modem Copyright Table of Contents RF Neulink NL6000 User Guide RF Neulink NL6000 User Guide Product Overview Use the NL6000 in a Simple ConfigurationFeatures Single and Multi- Point Addressing Configuration TemplatesAcknowledgement Auto-TransmitRegulatory Information Safety WarningFCC Part 406.0 to 406.1 MHz OperationGeneral Specifications SpecificationsCurrent Drain at 12 UHF Radio SpecificationsTransmitter ReceiverVHF Radio Specifications Power Connections Hardware Installation and OperationParts Description Serial PortDCE DTELEDs Antenna ConnectionOperation LEDTechnical Support Software ConfigurationPrerequisites PreparationSource and Destination Addressing Unique Data Requirements for a Base StationAddressing with Wildcards Behavior of Repeater UnitsRepeat from a Base to a Remote Repeat to Multiple Remotes using Wildcard Packet Data Options Transmission ModeFEC CRCRF Neulink NL6000 User Guide Acknowledgements Over-the-Air Data RatesDCD Mode Carrier Sense Multiple AccessSerial Connection to an I/O Device Basic Serial ParametersPre- and Post-Data DCD Time Factory Default ParametersPlanning the RF Channel Select Network ä Unit Type ProceduresGeneral Procedures Returning to the Previous Menu Displaying the Configuration Summary WindowSetting the Unit Type Select Network ä Unit Type Radio Network SetupSetting the Unit ID Myid Select Network ä Myid Setting the Target Unit ID ToidSerial Connection Setup Setting the Packet Mode Select Network ä Packet Mode Data SetupSetting the Request ACKs Option Setting the Data Rate Select Network ä Data RateSetting the Contention Option Select Network ä Contention Setting the Max Retries OptionTrigger ID Value Use Repeater SetupFile Management Downloading a Software UpgradeRestoring Parameters from Disk Select Save/Restore Parameters ä Save Parameters to DiskSaving Parameters to Disk Restoring Default Parameters Main Menu Summary Window Menu Quick ReferenceSerial Menu DCD RS-232 SubMenu Network Menu Repeater SubMenu Radio Menu Diagnostics Menu Save/Restore Parameters Menu Duty Cycle TroubleshootingOther Considerations Unit Does Not Enter Programming Mode Use a Fully-Wired RS-232 CableUse a Slower Baud Rate Use a Faster Baud RateSetting the Frequency Trim includes setting Power Appendix a Diagnosing and Correcting Performance ProblemsSetting the Power Value Select Diagnostics ä Transmit Continuous Random Data∙ Select Frequency Trim from the Diagnostics menu Setting the Deviation and BalanceSelect Diagnostics ä Transmit 100 Hz Square Wave ∙ Select Radio Ä Transmit Frequency for Active Channel∙ Select Deviation from the Diagnostics menu Setting the Receive Gain∙ Select Diagnostics ä Receive Diagnostic Mode ∙ Select Diagnostics ä Receive GainFactory Default Values Appendix B Factory Default ParametersCategory Parameter Default Value Custom Value Index RF Neulink NL6000 User Guide