Packet Data Options, Transmission Mode | RF-Link Technology NL6000

In Figure 14, the repeater unit listens on FA for transmissions from both the base station and the remote. The example shows a half-duplex channel between the repeater and base station (FA and FB) and a simplex channel between the repeater and remote (FA only).

If the network plan requires more than one repeater unit to reach the hidden remote, you can specify a Transmit Delay (msec) to stagger the transmissions from each repeater. Figure 15 shows a sample network with two repeaters. Each repeater trigger entry has its own transmit delay.

Figure 15: Sample Network with Two Repeaters

In a scenario with two repeaters, such as Figure 15, determine how to set the Transmit Delay based upon the following conditions:

∙Is it possible that both repeaters may hear the same transmission?

∙Is it possible for the ultimate destination to hear the transmission of both repeaters?

If either these conditions is false, you may set Transmit Delay for both repeaters to zero (0).

If both of these conditions are true, you should set Transmit Delay on one repeater to a larger value, such as 0080 msec, and you must enable Carrier

Sense Multiple Access (CSMA). See Section 5.6.5 for more information about

CSMA. In this case, the delay must be large enough so the delayed repeater

recognizes that the other repeater has started transmitting.

5.6.Packet Data Options

5.6.1.Transmission Mode

The NL6000 supports the following three packet transmission modes:

∙Basic Telemetry mode

∙Enhanced Telemetry mode

RF Neulink

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NL6000 User Guide

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RF-Link Technology NL6000 manual Packet Data Options, Transmission Mode

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 Configuration Features Single and Multi- Point Addressing Configuration TemplatesAcknowledgement Auto-Transmit Regulatory Information Safety WarningFCC Part 406.0 to 406.1 MHz Operation General Specifications Specifications Current Drain at 12 UHF Radio SpecificationsTransmitter Receiver VHF Radio Specifications Power Connections Hardware Installation and OperationParts Description Serial Port DCE DTE LEDs Antenna ConnectionOperation LED Technical Support Software ConfigurationPrerequisites Preparation Source and Destination Addressing Unique Data Requirements for a Base Station Addressing with Wildcards Behavior of Repeater Units Repeat from a Base to a Remote Repeat to Multiple Remotes using Wildcard Packet Data Options Transmission Mode FEC CRC RF Neulink NL6000 User Guide Acknowledgements Over-the-Air Data Rates DCD Mode Carrier Sense Multiple AccessSerial Connection to an I/O Device Basic Serial Parameters Factory Default Parameters Planning the RF ChannelPre- and Post-Data DCD Time Select Network ä Unit Type Procedures General Procedures Returning to the Previous Menu Displaying the Configuration Summary Window Setting the Unit Type Select Network ä Unit Type Radio Network SetupSetting the Unit ID Myid Select Network ä Myid Setting the Target Unit ID Toid Serial Connection Setup Setting the Packet Mode Select Network ä Packet Mode Data Setup Setting the Request ACKs Option Setting the Data Rate Select Network ä Data RateSetting the Contention Option Select Network ä Contention Setting the Max Retries Option Trigger ID Value Use Repeater Setup File Management Downloading a Software Upgrade Select Save/Restore Parameters ä Save Parameters to Disk Saving Parameters to DiskRestoring Parameters from Disk Restoring Default Parameters Main Menu Summary Window Menu Quick Reference Serial Menu DCD RS-232 SubMenu Network Menu Repeater SubMenu Radio Menu Diagnostics Menu Save/Restore Parameters Menu Troubleshooting Other ConsiderationsDuty Cycle Unit Does Not Enter Programming Mode Use a Fully-Wired RS-232 CableUse a Slower Baud Rate Use a Faster Baud Rate Setting 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 Gain Appendix B Factory Default Parameters Category Parameter Default Value Custom ValueFactory Default Values Index RF Neulink NL6000 User Guide