FreeWave LRS-455 User Manual

LRS-455 Data Transceiver Manual

FreeWave Technologies

LRS-455

Data Transceiver

Version 1.0

FreeWave Technologies, Inc.

1880 South Flatiron Court

Boulder, CO 80301

[phone]

[phone] Fax

www.FreeWave.com

LUM0016AA Rev A Version 1.0 i

LRS-455 Data Transceiver Users Manual

LICENSED BAND WIRELESS DATA TRANSCEIVER USER MANUAL

Copyright © 1995-2009 by FreeWave Technologies, Inc. All rights reserved. Published 2009.

W

ARRANTY

FreeWave Technologies warrants your FreeWave® Wireless Data Transceiver against defects in
materials and manufacturing for a period of two years from the date of shipment. In the event of a
Product failure due to materials or workmanship, FreeWave will, at its option, repair or replace the
Product. The Product must be returned to FreeWave upon receiving a Return Material Authorization
(RMA) for evaluation of Warranty Coverage.

In no event will FreeWave Technologies Inc., its suppliers, and its licensors be liable for any damages
arising from the use of or inability to use this Product. This includes business interruption, loss of
business information, or other loss which may arise from the use of this Product. Please be advised that
OEM customer’s warranty periods may vary.

Warranty Policy may not apply:

1. If Product repair, adjustments or parts replacements is required due to accident, neglect, unusual
physical, electrical or electromagnetic stress.

2. If Product is used outside of FreeWave specifications.

3. If Product has been modified, repaired or altered by Customer unless FreeWave specifically
authorized such alterations in each instance in writing. This includes the addition of conformal
coating.

Special Rate Replacement Option
A special rate replacement option is offered to non-warranty returns or upgrades. The option to purchase

the replacement unit at this special rate is only valid for that RMA. The special replacement rate option
expires if not exercised within 30 days of final disposition of RMA.

R

ESTRICTED RIGHTS

Any product names mentioned in this manual may be trademarks, or registered trademarks of their
respective companies and are hereby acknowledged.

Information in this manual is subject to change without notice and is proprietary and confidential to
FreeWave Technologies, Inc.

This manual is for use by purchasers and other authorized users of the FreeWave® Wirele ss Data
Transceiver only.

No part of this manual may be reproduced or transmitted in any form or by any means, electronic or
mechanical, or for any purpose without the express written permission of FreeWave Technologies, Inc.

FreeWave’s Wireless Data Transceivers are designed and manufactured in the United States of America.
Printed in the United States of America.

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LRS-455 Data Transceiver Users Manual

FCC NOTIFICATIONS

The transceiver is approved under Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) this device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation. Any unauthorized modification
or changes to this device without the express approval of FreeWave Technologies may void the user’s
authority to operate this device. Furthermore, this device is intended to be used only when installed in
accordance with the instructions outlined in this manual. Failure to comply with these instructions may
void the user’s authority to operate this device.

Note: The LRS-455 transceivers are approved for use in Canada within the 450MHz to 470MHz b and.

CAUTION: The LRS-455 series transceiver have maximum transmitted output power of 2W. It is

recommended that the transmit antenna be kept at least 71 cm away from nearby persons
to satisfy FCC RF exposure requirements.

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Table of Contents

LRS-455 Data Transceiver Users Manual

ABOUT FREEWAVE TRANSCEIVERS.................................................................................................................6

CHOOSING A LOCATION FOR THE TRANSCEIVERS....................................................................................6

CHOOSING POINT-TO-POINT OR POINT-TO-MULTIPOINT OPERATION........................................................................7

QUICK START ON A POINT-TO-MULTIPOINT NETWORK..........................................................................8

POINT-TO-MULTIPOINT OPERATION LEDS................................................................................................................8

QUICK START ON A POINT-TO-POINT NETWORK........................................................................................9

POINT-TO-POINT OPERATION LEDS...........................................................................................................................9

SETTING UP A TRANSCEIVER...........................................................................................................................10

OPERATION MODE....................................................................................................................................................10

BAUD RATE..............................................................................................................................................................12

CALL BOOK..............................................................................................................................................................15

RADIO TRANSMISSION CHARACTERISTICS ...............................................................................................................16

EDIT RADIO TRANSMISSION CHARACTERISTICS.......................................................................................................16

Setting Xmit and Rcv Frequencies.......................................................................................................................16

(1) and (2) Max Packet Size and Min Packet Size...............................................................................................17

(3) Xmit Rate........................................................................................................................................................18

(4) RF Data Rate .................................................................................................................................................18

(5)RF Xmit Power................................................................................................................................................18

(6) Slave Security.................................................................................................................................................18

(7) RTS to CTS.....................................................................................................................................................19

(8) Retry Time Out...............................................................................................................................................19

(9) Lowpower Mode.............................................................................................................................................20

(A) High Noise.....................................................................................................................................................20

(C) Remote LED ..................................................................................................................................................21

MULTIPOINT PARAMETERS ......................................................................................................................................22

EDIT MULTIPOINT PARAMETERS..............................................................................................................................22

(0) Repeaters........................................................................................................................................................22

(1) Master Packet Repeat....................................................................................................................................22

(2) Max Slave Retry.............................................................................................................................................23

(3) Retry Odds ................................................................................................................. ....................................23

(4) DTR Connect..................................................................................................................................................23

(6) Network ID..................................................................................................................................................... 23

(8) MultiMaster Sync...........................................................................................................................................23

(9) 1 PPS Enable/Delay.......................................................................................................................................24

(A) Slave/Repeater...............................................................................................................................................24

(B) Diagnostics....................................................................................................................................................24

(C) Subnet ID.......................................................................................................................................................24

(D) Radio ID........................................................................................................................................................25

(E) Local Access..................................................................................................................................................25

(G) Radio Name...................................................................................................................................................25

RADIO INFORMATION ...............................................................................................................................................26

Number of Disconnects........................................................................................................................................ 26

Antenna Reflected Power.....................................................................................................................................26

Average Noise Level............................................................................................................................................26

Average Signal Level...........................................................................................................................................27

Overall Rcv Rate (%)...........................................................................................................................................27

Radio Temperature..............................................................................................................................................27

FACTORY DEFAULT SETTINGS.........................................................................................................................28

OPERATIONAL RS-422 AND RS-485 INFORMATION .................................................................................................29

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LRS-455 Data Transceiver Users Manual

RS-422 and RS-485 Full Duplex Pin-Outs..........................................................................................................30

RS-485 Half Duplex Pin-Outs..............................................................................................................................30

RS232 PIN ASSIGNMENTS ........................................................................................................................................30

RF BOARD PINOUT...................................................................................................................................................31

FREEWAVE TECHNICAL SUPPORT ............................................................................................................................31

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LRS-455 Data Transceiver Users Manual

About FreeWave Transceivers

FreeWave transceivers operate in virtually any environment where RS232 data communications occur. A
pair of transceivers function as a 9-pin null modem cable. If the FreeWave transceivers are to be used in
an application where a null modem cable is used, such as communication between two computers, then
the FreeWave transceivers can be connected directly. If FreeWave transceivers are to be used to replace
a straight-through RS232 cable, then a null modem cable must be placed between the transceiver and
the DTE instrument to which it is connected.

Choosing a Location for the Transceivers

Placement of the FreeWave transceiver is likely to have a significant impact on its performance. The key
to the overall robustness of the radio link is the height of the antenna. In general, FreeWave units with a
higher antenna placement will have a better communication link. In practice, the transceiver should be
placed away from computers, telephones, answering machines and other similar equipment. The RS232
cable included with the transceiver usually provides ample distance for placement away from other
equipment. To improve the data link, FreeWave Technologies offers directional antennas with cable
lengths ranging from 3 to 200 feet. When using an external antenna, placement of that antenna is critical
to a solid data link. Other antennas in close proximity are a potential source of interference; use the Radio
Statistics to help identify potential problems. The Show Radio Statistics page is found in option 4 in the
Main Menu. An adjustment as little as 2 feet in antenna placement can resolve some noise problems. In
extreme cases, band pass filter may reduce the out-of-band noise.

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LRS-455 Data Transceiver Users Manual

Choosing Point-to-Point or Point-to-MultiPoint Operation

A Point-to-Point network is limited to one Master and one Slave transceiver.
In a Point-to-MultiPoint network (also referred to as MultiPoint network) the transceiver, designated as a

Master, is able to simultaneously communicate with numerous Slaves. In its simplest form, a MultiPoint
network functions with the Master broadcasting its messages to all Slaves and the Slaves respondin g to
the Master when given data by the device connected to the data port.

It is important to note the differences between Point-to-Point and MultiPoint networks. In a Point-to-Point
network all packets are acknowledged, whether sent from the Master to the Slave or from the Slave to the
Master. In a MultiPoint network, outbound packets from the Master to Slaves are sent a set number of
times determined by the user. The receiving transceiver will accept the first packet received that passes
the 32 bit CRC. However, the packet is not acknowledged. On the return trip to the Master, all packets
sent by the Slave are acknowledged or retransmitted until they are acknowledged. Therefore, the return
link in a MultiPoint network is generally very robust.

Note: In licensed band operation it is suggested to set the repeated master packets at 0 due to
the spectrum being quiet. This will maximize throughput and leverage the advantages of licensed
band operation.

Traditionally, a MultiPoint network is used in applications where data is collected from many instruments
and reported back to one central site. As such, the architecture of such a network is different from Point­to-Point applications. The number of radios in a MultiPoint network is influenced by the following
parameters:

1. Size of the blocks of data. The longer the data blocks, the smaller the network capacity.

2. Baud rate.

3. The amount of contention between Slaves. Polled Slaves vs. timed Slaves.

For example, if the network will be polling Slaves once a day to retrieve sparse data, several hundred
Slaves could be configured to a single Master. However, if each Slave will be transmitting data at greater
levels, then fewer Slaves should be linked to the Master. The overall network will be closer to capacity
with fewer Slaves.

For examples and additional information on data communication links, see the section Examples
of Data Communication Links later in this document.

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LRS-455 Data Transceiver Users Manual

Quick Start on a Point-to-MultiPoint Network

The following is a quick start guide for setting up two transceivers in Point-to-MultiPoint mode. This mode allows for a
Master to communicate with several Slaves simultaneously.

1. Connect the transceiver to the serial port of a computer either through a serial cable or via the diagnostics
cable. Make sure to connect the radio to a power source (typically, 6 to 30 VDC).

2. Open up a HyperTerminal session.

• Use the following settings in connecting with HyperTerminal

• Connect to COMx (where 'x' is the number of the com port being connected to)

• Set data rate to - 19,200, data bits - 8, Parity- none, Stop bits – 1, Flow control – none.

3. Press the Setup button on the radio. If using the diagnostics cable, press Shift-U (capital U).

• The three lights on the board should all turn green, indicating Setup mo de.

• The main menu will appear on the screen.

4. Press 0 to get into the Operation Mode menu.

• Press 2 to set the radio as a point to MultiPoint Master.

• OR, Press 3 to set the radio as a point to MultiPoint Slave.

• Press Esc to get back to Main menu.

5. Press 1 in the main menu to change the Baud Rate.

• The baud rate must be changed to match the baud rate of the device that the radio is to be attached to.

• Press Esc to get back to Main menu.

6. At the Main Menu, press 3.

• Set FreqKey, Max Packet Size, Min Packet Size, RF Data rate identical on all radios in the network.
Note: Changing these values may help to eliminate interference from other FreeWave networks.

• Press Esc to get back to Main menu.

7. At the Main Menu, press 5.

• Set the Network ID value to any value between 1 and 4095, except 255.

• Make sure this value is the same on every radio in the network.

Point-to-MultiPoint Operation LEDs.

Master Slave

Condition Carrier Detect

Powered, not linked Solid red

Slave linked to Master,
no data

Slave linked to Master,
Master sending data to
Slave

Slave linked to Master,
Slave sending data to
Master

Master with diagnostics
program running

(CD)

bright

Solid red

bright

Solid red

bright

Solid green

RCV data

or Solid red

bright

Solid red

bright

* Clear to Send LED will be solid red with a solid link, as the link weakens the Clear to Send LED light on the Slave
will begin to flash

\.

Transmit

(TX)

Solid red

dim

Solid red

dim

Solid red

dim

Solid red

dim

Solid red

dim

Clear to

Send (CTS)

Off  Solid red

Off  Solid

Off  Solid

Intermittent

flash

redÑoÒ

Intermittent

flash

redÑoÒ

Carrier
Detect

(CD)

bright

green

green

Solid

green

Solid

green

Transmit

(TX)

Off  Blinking

Off  * Solid red

Off  * Solid red

Intermittent

flash

redÑoÒ

Intermittent

flash

redÑoÒ

Clear to

Send

(CTS)

red

bright

bright

* Solid red

bright

* Solid red

bright

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LRS-455 Data Transceiver Users Manual

Quick Start on a Point-to-Point Network

When purchased as a pair, the FreeWave® Wireless Data Transceivers are shipped from the factory pre-

configured to operate in Point-to-Point applications. To establish communications between a pair of
FreeWave Wireless Data Transceivers just received from the factory:

1. Connect antennas to the transceivers. Freewave Technologies recommends that the antenna
port be loaded at all times to prevent damage to the LRS-455 radios. Noise potential may be
reduced on the bench by lowering the Xmit power.

2. Connect the transceiver to the instrument with the RS232 cable and also attach power. The
cable supplied with enclosed transceivers (except Waterproof) is a 9-pin male serial; professional
board level transceivers will need a separate programming cable (sold separately).

3. Set the Modem mode in each transceiver. One should be set as a Point-to-Point Master (Mode

0) and the other set as a Point-to-Point Slave (Mode 1).

4. Set the baud rate on each transceiver to match the baud rate of the instrument to which it is
attached. Please note, when setting the transceiver's baud rate, its RS232 data rate is set. The
baud rate does not have to be on the same setting for the two transceivers.

5. Edit the Call Book. Enter the Slave serial number in the Master’s Call Book. Enter the Master’s
Serial number in the Slave’s Call Book, or disable Slave Security (in the Slave).

6. Shortly after both transceivers are plugged in, they should establish a communications link with
each other and the connection is complete. Using the table below, verify that the radios are
operating as expected.

Point-to-Point Operation LEDs

Master Slave

Condition Carrier

Powered, no link Solid red

Linked, sending
sparse data

Master calling
Slave

Mode 6 - waiting
for ATD command

Setup Mode Solid

Detect

(CD)

bright 

Solid

green

Solid red

bright

Solid red

bright

green

Transmit

(TX)

Solid red

bright

Intermittent

flash

redÑoÒ
Solid red

dim
Off  Blinking

Solid

green

Clear to

Send (CTS)

Solid red

bright

Intermittent

flash

redÑoÒ
Solid red

bright

red\

Solid green Solid

Carrier

Detect (CD)

Solid red

bright

Solid

green

Solid red

bright

Solid red

bright

green

Transmit

(TX)

Off 

Intermittent

flash

redÑoÒ

Off  Blinking red

Off  Blinking red

Solid

green

Clear to

Send (CTS)

Blinking red

\

Intermittent

flash

redÑoÒ

\

\

Solid

green

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LRS-455 Data Transceiver Users Manual

Setting up a Transceiver

Operation Mode

The Operation Mode option designates the method FreeWave transceivers use to communicate with
each other. FreeWave transceivers operate in a Master to Slave configuration. Before the transceivers
can operate together, they must be set up to properly communicate.

In a Point-to-Point configuration, Master or Slave Mode may be used on either end of the communication
link without performance degradation. When setting up the transceiver, remember that a number of
parameters are controlled by the settings in the Master. Therefore, deploying the Master on the
communications end where it will be easier to access is advised, but not necessary.

Operation

Description

Mode

Point-to-Point
Master (0)

This mode designates the transceiver as the Master in Point-to-Point mode. The
Master may call any or all Slaves designated in its Call Book.

In Point-to-Point mode the Master determines the setting used for most of the
radio transmission characteristics, regardless of the settings in the Slave. The
settings not determined by the Master are: RF Xmit Power, Slave Security, Retry
Time Out, and the Hop Table settings.

A quick method of identifying a Master is to power the transceiver. Prior to
establishing a communication link with a Slave, all three of the Master’s LEDs
will be solid red.

Point-to-Point
Slave (1)

This mode designates the transceiver as a Slave in Point-to-Point mode. The
Slave communicates with any Master in its Call Book.

When functioning as a Slave, the Entry to Call feature in the transceiver’s Call
Book is not operational. The Call Book may be bypassed in the Slave by setting
Slave Security to 1. See the Slave Security section later in this manual.

Point–to­MultiPoint
Master (2)

This mode designates the transceiver as a Master in MultiPoint mode. This
mode allows one Master transceiver to simultaneously be in communication with
numerous Slaves.

A Point-to-MultiPoint Master communicates only with other transceivers
designated as Point-to-MultiPoint Slaves.

Point-to­MultiPoint

This mode designates the transceiver as a Slave in MultiPoint mode. This mode
allows the Slave to communicate with a MultiPoint Master. The Slave may

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Slave (3) communicate with its Master.

LRS-455 Data Transceiver Users Manual

Point-to-Point
Repeater (5)

Point-to-Point
Slave/Master
Switchable (6)

Point-to­MultiPoint
Repeater (7)

FreeWave allows the use of one repeater in a Point-to-Point communications
link, significantly extending the operating range. When designated as a
Repeater, a transceiver behaves as a pass-through link. All settings for the call
book, baud rates and radio transmission characteristics are disabled. A Repeater
will connect with any Master that calls it. The Repeater must be set up properly
in the Master's call book.

Mode 6 allows the transceiver to be controlled entirely through software
commands. A number of key parameters in FreeWave's user interface may be
changed either directly with a program such as Windows Terminal or through the
use of script files. Additionally, when the Point-to-Point Slave/Master Switchable
option is selected and the transceiver is not calling a Slave, it will function as a
Slave and accept any appropriate calls from other transceivers.

This option allows the transceiver to operate as a Repeater in a MultiPoint
network. See the MultiPoint parameters section for details on enabling
MultiPoint Slave/Repeater mode.

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LRS-455 Data Transceiver Users Manual

Baud Rate

This setting is the communication rate between the transceiver and the instrument to which it is
connected. It is important to note that this is independent of the baud rate for the other transceiver(s) in
the network. For example, a pair of transceivers may be used in an application to send data from remote
process instrumentation to an engineer's computer. In this application, the baud rate for the transceiver
on the instrumentation might be set to 9600, and the transceiver on the engineer’s computer might be set
to 57,600.

Set Baud Rate

1. Select the appropriate baud rate to match the attached device.

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Baud Rate Description
Actual Baud Rate

(selections 0-9)

The actual baud rate for the transceiver’s data port.
It is desirable to set the baud rate to the highest level supported by the device to

which it is connected. In certain circumstances, however, this may actually result
in slower data communications.

Data, Parity

There are six data word length and parity configurations available to be used with
FreeWave transceivers. The default setting is 0 (8, N, 1) and is the most commonly
used serial communications protocol. Select the appropriate option to
communicate with the end device.

Data Bits Parity Stop Bits

8 None 1
7 Even 1
7 Odd 1
8 None 2
8 Even 1
8 Odd 1

LRS-455 Data Transceiver Users Manual

Modbus RTU

Serial Interface

Setup Port

Support for Modbus RTU protocol is available. The default setting for Modbus
RTU is 0 (Not Enabled).

To enable Modbus capability, set Modbus RTU to 1.

Note: When using the transceiver in Modbus RTU mode, the Master Packet

Repeat must be set to 3 regardless of whether the network is in Point-to-Point or
MultiPoint mode. The Modbus RTU mode must be selected when transceivers are
configured in RS485 or RS422 mode.

In products for which the protocol of the data port is software selectable, use this
menu to set the protocol of the data port. In the TTL RF board product this setting
must be "0".

Protocol Additional Information

RS232 Also used for TTL tra nsceivers.
RS422 Modbus RTU mode must be enabled. See above.
RS485 Modbus RTU mode must be enabled. See above.
DOT Special for the Department of Transportation.

Note: When DOT mode is enabled, the TimeDelay settings operate the same as

in the RS485/422 mode.

Note: RS4xx mode must have Modbus RTU enabled, and TurnoffDelay set to at
least 4.

Note: DO NOT change this setting unless the correct programming cable is
available for the new setting.

This setting determines which port, Main or Diagnostics, is used to enter the Setup
Main Menu.

Port Additional Information

Main Only The terminal is connected to the Main Data Port.
Diagnostics Only The terminal is connected to the Diagnostic Port.

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TurnOn/OffDelay

LRS-455 Data Transceiver Users Manual

Both Ports The terminal may be connected to either port.

Setup mode is invoked by sending a "U" (capital) to the Diagnostics port or by
pressing/toggling the Set-up button/switch, if available. OEM boards may also
enter Setup when Pin 2 is grounded.

The Main Data Port is the RS232 port. The OEM modules use a 2-row, 2 mm
female connector. The diagnostic cable for this port (ASC2009DC) is available from
FreeWave.

TurnOnDelay- Sets the delay between when the line drivers are turned on and
when the data leaves the data port. This setting can be adjusted for a 1-9 mS
delay.

TurnOffDelay- This setting specifies the time after the end of transmission of a
character to the RS485 bus that the transceiver stops driving the bus and releases
the bus to other devices. The units are ¼ of a character with a range of 0-9. An
entry of 4 means a delay equivalent to the duration of a full character. Default is
zero delay.

For data rates of 1200 bits/S or slower, avoid setting the TurnoffDelay parameter
higher than 4. At those rates the functionality of the microprocessor changes so
that a TurnoffDelay of 5 will have the same effect as if set to 1, and a setting of 6
will have the same effect as 2, and so on.

FlowControl

Note: TurnOffDelay must be set to a value of at least 4 for RS4xx operation.

This menu specifies the hardware flow control for the Data port. The options for 0-3
are described below.

Port Additional Information

None Default - Uses software control (XON XOFF)
RTS
DTR

DOT

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Call Book

LRS-455 Data Transceiver Users Manual

The Call Book is required to be used in Point-to-Point networks. The instructions provided in this section
are for Point-to-Point mode only.

Using the Call Book offers both security and flexibility in determining how FreeWave transceivers
communicate with each other.

Three settings must be made for two FreeWave transceivers to communicate in Point-to-Point mode:

1. The Master’s serial number must be listed in the Slave's Call Book or Slave Security is turned off

in the Slave.

2. The Slave’s serial number must be listed in the Master's Call Book.

3. The Master must be programmed to call the Slave.

The Call Book allows users to incorporate up to 10 FreeWave transceivers, and designate which Slave the
Master will call. To set the Entry to Call option, select the appropriate option in the drop down.

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LRS-455 Data Transceiver Users Manual

Radio Transmission Characteristics

The Edit Radio Transmission Characteristics option allows the user to modify several different param eters
in the transceiver. Many of these parameters must be maintained throughout the network for proper
functionality.

Note: This menu is only for the sophisticated user who has a good understanding of the principles of

radio data transmission.

The settings for the Slave(s) not determined by the Master are RF Xmit Power, Slave Security, Retry
Time Out and Hop Table Size, Hop Table Version, and Hop Table Offset.

Edit Radio Transmission Characteristics

SETTING XMIT AND RCV FREQUENCIES

The 400MHz Data Transceiver has the option to operate in a Frequency Division Duplex mode by
transmitting on one frequency and receiving on another.

The LRS-455 transceivers must be programmed to operate on the appropriate frequen cy. To program the
transceiver for single channel operation, enter the frequency, in Megahertz, into the TX and RX
Frequency slots.

If the transceivers are to operate in Frequency Division Duplex, the TX and RX Frequency slots will have
different frequencies assigned.

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LRS-455 Data Transceiver Users Manual

(1) AND (2) MAX PACKET SIZE AND MIN PACKET SIZE

The Max and Min Packet Size settings and the RF Data Rate determine the number of bytes in the
packets. Throughput can be enhanced when packet sizes are optimized.

The following 3 tables provide the information to determine optimum setting values.

Minimum Packet Size Definition

Min Setting Min Packet Size

0 0
1 16
2 32
3 48
4 64
5 80
6 96
7 112
8 128
9 144

Maximum Packet Size (2 level FSK)

Max Setting Max Packet Size

0
1
2
3
4
5
6
7
8
9

32
48
64
80

96
112
128
135
135
135

Maximum Packet Size (4 level FSK)

Max Setting Max Pack et Size

0
1
2
3
4
5
6
7
8
9

32

48

64

80

96
112
128
144
160
176

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LRS-455 Data Transceiver Users Manual

(3) XMIT RATE

There are two settings for the Transmit Rate parameter. The setting for normal operation of the
transceiver is a Transmit Rate 1. Transmit Rate 0 is useful to qualitatively gauge signal strength in Point
to Point mode. When set to Transmit Rate 0, the transceivers will transmit back and forth continuously
regardless if they have any actual data. In Point-to-Point operation, Transmit Rate 0 should be used only
as a diagnostic tool and not for normal operation. The strength of the signal may be gauged by the Clear
to Send LED. A solid red CTS LED indicates a strong signal; a blinking CTS LED indicates a weaker
signal.

(4)

RF DATA RATE

FreeWave transceivers have five settings for the RF Data Rate (1, 2, 3, 4, 5 ). RF Data Rate should not
be confused with the serial port Baud Rate.

Setting 2 should be used when the transceivers are close together and data throughput needs to be
optimized. Setting 3 should be used when the transceivers are farther away and a solid data link is
preferred over data throughput.

Note: In MultiPoint networks, the RF Data Rate must be set identically in all transceivers. Any

transceiver with an RF Data Rate different from the Master will not establish a link.

In Point to Point networks the Master’s settings take precedence over the Slave.

RF Data Rate Setting Occupied Bandwidth Modulation Level

1 50kHz 2-level GFSK
2 25kHz 4-level GFSK
3 25kHz 2-level GFSK
4 12.5kHz 4-level GFSK
5 12.5kHz 2-level GFSK

Note: RF Data Rates 4 and 5 only are currently FCC Approved.

(5)RF

XMIT POWER

The RF Xmit Power parameter allows the user to control the output transmit power up to two watts
(+33dBm), when RF Xmit power is set to 10.

(6)

SLAVE SECURITY

Slave security is a feature which allows Slave transceivers to accept transmissions from a Master not
included in the Call Book. The default setting is 0 (Slave Security enabled) which means, only Masters in
the Slaves’ Call Book may link to that Slave.

Slave Security may be disabled (setting of 1) allowing any Master to call the Slave. Slave Security has no
effect in Point-to-MultiPoint networks where the Network ID is not set to 255.

Slave Security must be set to 1 when the unit is operating in Mode 6 Slave/Master switchable or a Point­to-Point network where the Slave may need to accept calls from more than 10 different Masters. When
Slave Security is set to 1, the transceiver will accept calls from any other FreeWave transceiver.
Additional network security measures may be taken to prevent unauthorized access, such as changing
default settings for FreqKey, Hop Table or Frequency Zones.

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(7) RTS TO CTS

Menu selection RTS to CTS in the Radio Parameters menu provides the option of allowing the RTS line
on the Master transceiver to control the CTS line of the Slave. This pass-through control can be enabled
in both Point-to-Point and Point-to-MultiPoint. In MultiPoint networks, the Master RTS line will control all
Slaves’ CTS lines. When enabled, the CTS line ceases to function as flow control. It is not recommended
to enable this feature when operating at RS-232 speeds above 38.4kB.

The default setting of 0 disables this function, where as a setting of 1 enables RTS-CTS control.
RTS-CTS setting 2 is described in detail in the application note #5437 DTR to CTS Line Alarm Feature

.

With an RTS to CTS setting of 1, the Master senses the RTS line prior to all scheduled packet
transmissions. If the state has changed, the Master will then transmit a message to the Slave with the
new status. This transmission will occur regardless of data being sent. If data is ready to be sent, the
RTS status message will be sent in addition to the data. In Point-to-Point mode, the Master will continue
sending the new status message until it receives an acknowledgment from the Slave. In MultiPoint mode,
the Master will repeat the message the number of times equal to the Master Packet Repeat value in the
MultiPoint Parameters menu.

Master transmit times are completely asynchronous to the occurrence of any change of the RTS line; the
latency time from RTS to CTS is variable. The Max and Min Packet Size parameters in the Radio
Parameter menu determine this duration. Setting both parameters to their maximum value of 9 will
produce a maximum latency time of approximately 21 ms. At the minimum settings for Max and Min
Packet Size (0), the time will be approximately 5.9 ms. Please note that this latency can increase
significantly if packets are lost between the Master and Slave. In Point-to-MultiPoint mode, there is no
absolute guarantee that the state change will be communicated to all Slaves in the unlikely event that all
repeated packets from the Master do not get through to all Slaves.

Note: If DTRConnect is enabled and set to 2, the RTS to CTS feature will not work.
Note: If the DTRConnect is enabled and set to 1, RTS to CTS mode takes precedence over the

functionality of the CTS line on the Slave relating to the DTRConnect feature.

Note: The RTS to CTS option is only available in RS232 mode.

(8)

RETRY TIME OUT

The Retry Time Out parameter in a Slave sets the delay the unit will wait before dropping the connection
to a Master in MultiPoint mode. The factory default is set at the maximum of 255. The maximum setting
means that if 1 packet in 255 is sent successfully from the Master to the Slave, the link will be maintained.
The minimum setting is 8. This allows a Slave to drop a connection if less than 1 in 8 consecutive packets
is successfully received from the Maste r.

On the other hand, the function in the Master is effectively the same. With a setting of 255, the Master
will allow a Slave to stay connected as long as 1 packet in 255 is successfully received at the Master.

The Retry Time Out parameter is useful when a MultiPoint network has a roving Master or Slave(s). As
the link gets weaker, a lower setting will allow a poor link to break in search of a stronger one.

Note: Setting Retry Time Out to 20 is recommended in areas where several FreeWave networks exist.

This setting will allow Slaves to drop the connection if the link becomes too weak, while at the
same time prevent errant disconnects due to interference from neighboring networks.

While intended primarily for MultiPoint networks, the Retry Time Out parameter may also be modified in
Point-to-Point networks. However, the value in Point-to-Point mode should not be set to less than 151.

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(9) LOWPOWER MODE

The Lowpower Mode feature allows a MultiPoint Slave to consume less power. When set to 2 through 31,
the transceiver will sleep between slots. For example, at a setting of 2 the transceiver sleeps 1 out of 2
slots; at a setting of 3 the transceiver sleeps 2 out of 3 slots, and so on.

The following table shows the changes at different Lowpower Mode settings. Th e actual current draw
depends on many factors. The table below gives only a qualitative indication of supply current savings. A
low number reduces latency and a high number reduces current consumption.

Setting Description

Current Draw

0 Lowpower, disabled
1

LEDs dimmed, transceiver remains awake, transceiver is listening to the
Master’s transmissions on every slot, and transceive r’s data port is shut
down if the RTS line is deasserted (low). In this case, the transceiver

needs to be awakened before it will be able to send data to the Master.
2 LEDs dimmed, transceiver sleeps every other slot
3 LEDs dimmed, transceiver sleeps 2 of 3 slots
4-31

LEDs dimmed, transceiver sleeps the number of slots corresponding to

the setting. For example, with a setting of 31 the transceiver sleeps 30 of

31 slots.

I

MPORTANT NOTES

1. Lowpower Mode is used only in MultiPoint Slaves using serial protocol. Power savings occur only

when the Slave is linked. There are no power savings when the Slave is transmitting data.
Lowpower Mode is of little value when a Slave has a constant, high throughput. MCUSpeed must
be set to ‘0’ and RF Data Rate must be set to ‘3’ for Lowpower Mode to operate properly.

2. To communicate to an RS232 port of a transceiver that is in Lowpower Mode, the RTS line must
be held high to wake it up. The transceiver will wake up within approximately 20 milliseconds of
when RTS goes high.

3. If the RTS line on the Slave is held high, the transceiver will remain in normal operation
regardless of the Lowpower Mode setting. Once RTS is dropped the transceiver reverts to the
Lowpower Mode.

More

Less

If the transceiver has the DTRConnect option set to 1 or 2 and if the Lowpower Mode enabled (set to 1-

31), the RTS line on the transceiver must be asserted for the ‘DTRConnect’ feature to operate properly.

(A)

HIGH NOISE

The High Noise Option is useful in determining if out of band interference is affecting a radio link. A
setting of 1 will provide a reduction of gain in the front end circuit thereby decreasing the affect of any out
of band noise. The results will be seen as a lower signal value and a much lower noise value (as found in
Radio Statistics or Diagnostics). If the noise is not reduced by a greater amount than the signal, the
interference is most likely an in band issue.

When a noise problem is shown to be helped by way of the High Noise option, chances are that the noise
may be further squelched by use of a band pass filter available for sale from FreeWave Technologies.

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(C) REMOTE LED

This setting enables the user to connect Remote LED’s through the diagn ostics port.
This feature is available in firmware versions 2.64 (900MHz) and 3.64 (2.4GHz) or higher.

Setting Description Notes

0 Board LED’s Default. Only on board LEDs are enabled.
1 Board and Remote LED’s

2 Remote LED’s

Note: When using Remote LED’s the center (TX) LED will not turn Green when in Setup mode. This line
is not pinned out.

Onboard LED’s are enabled as well as
Remote LED’s through the Diagnostic port.

On board LED’s are disabled. Remote LED’s
are enabled through the Diagnostic port.

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MultiPoint Parameters

When installing MultiPoint networks it is important to do some up front planning. Unlike Point-to-Point
networks, a Point-to-MultiPoint network requires several parameters are set consistently on all
transceivers in the network. This includes RF data rate and Min and Max Packet Size.

Note: If several independent MultiPoint networks are to be located in close proximity the planning

becomes more critical. In such cases, it becomes very important to include as much frequency
and time diversity as possible through use of different Min and Max Packet Size. In some
instances the use of the MultiMaster Sync option may be required.

Edit MultiPoint Parameters

(0) REPEATERS

The Repeaters selection must be set to On if a repeater is to be used in the network. However, if the
network will not utilize a repeater, FreeWave recommends setting Repeaters to Off to provide higher
throughput.

(1)

MASTER PACKET REPEAT

In a Point-to-MultiPoint network, Slaves do not acknowledge transmissions from the Master. If Slaves did
acknowledge all data transmissions, in a large network, the Master would soon become overwhelmed
with acknowledgments from the Slaves. Without acknowledgements, 100% confidence every Slave has
received every packet cannot be met. To address this issue, the user may modify the Master Packet
Repeat setting, assigning a value between 0 (the packet is transmitted once) to 9 (the packet is
transmitted 10 times). For networks with solid RF links, this parameter should be set to a low value such
as 0 or 1. If a network has some weak or marginal links it should be set with higher values. If a Slave
receives a good packet from a Master more than once it will discard the repeated packets

Increasing the Master Packet Repeat setting will increase the probability of a packet getting through, but
will also increase latency in the network because each packet from the Master is being sent multiple
times. Therefore, it is important to find the optimal mix between network robustness, throughput, and
latency. In general, a setting of 0 to 1 will work well for most well designed licensed band networks.

Note: The Master Packet Repeat may be set to 0 if the user software is capable of, or requires

acknowledgment. In this case if a packet sent by the Master and not received by the Slave, the
user software will control the retries as needed.

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MAX SLAVE RETRY

(2)

The Max Slave Retry setting defines how many times (0 to 9) the Slave will attempt to retransmit a packet
to the Master before beginning to use a back-off algorithm (defined by the Retry Odds setting). Slave
retries will stop when an acknowledgement is received from the Master.

(3)

RETRY ODDS

While packets transmitted from the Master to the Slaves in a MultiPoint network are not acknowledged,
packets transmitted from Slaves to the Master are. It is possible, that more than one Slave will attempt to
transmit to the Master at the same time. Therefore, it is important that a protocol exists to resolve
contention for the Master between Slaves. This is addressed through parameters (2) Max Slave Retry
and (3) Retry Odds. Once the Slave has unsuccessfully attempted to transmit the packet the number of
times specified in Max Slave Retry, it will attempt to transmit to the Master on a random basis. The Retry
Odds parameter determines the probability that the Slave will attempt to retransmit the packet to the
Master; a low setting will assign low odds to the Slave attempting to transmit. Conversely, a high setting
will assign higher odds. An example of how this parameter might be used would be when considering two
different Slaves in a MultiPoint network, one with a strong RF link and the other with a weak RF link to the
Master. It may be desirable to assign higher Retry Odds to the Slave with the weaker link to give it a
better chance of competing with the closer Slave(s) for the Master's attention.

When Retry Odds = 0, after the Slave has exhausted the number of retries set in the Max Slave Retry
parameter and still not gained the Master’s attention, the Slave’s data buffer will be purged.

(4)

DTR CONNECT

With the setting of 0 in the Slave, the transceiver will transmit when RS232 data is received. A setting of
1 will form a Point-to-Point link with the Master when the DTR line is high. With a setting of 2, the
transceiver will transmit in bursts. This mode is valuable when a network has many low data rate devices
and it is desirable to increase overall network capacity.

Note: If ‘DTRConnect’ is set to 1 and the ‘RTS to CTS’ function is enabled on the radio, then ‘RTS to

CTS’ takes precedence over ‘DTRConnect’.

Note: If ‘DTRConnect’ is set to ‘2’ and ‘RTS to CTS’ is enabled, then ‘RTS to CTS’ is ignored. The

transceiver has two separate transmit and receive user data buffers. These buffers are 2 Kbytes
each. In case of a buffer overflow, the transceiver will output unpredictable data.

NETWORK ID

(6)

Network ID allows MultiPoint networks to be established without using the Call Book. The default setting
of 255 enables the Call Book. To enable Network ID the value must be set between 0 and 4095
(excluding 255). Since Network ID does not use serial numbers, MultiPoint Masters may be rep laced
without reprogramming all of the Slaves in the network. Slaves will link with the first Master that it hears
that has a matching Network ID. The Network ID function should be used in conjunction with the Subnet
ID feature (If necessary).

Without having the serial numbers in the Call Book, a Slave may establish communications with different
Masters, though not at the same time. This is very useful in mobile MultiPoint applications.

(8)

MULTIMASTER SYNC

MultiMaster Sync is reserved for applications, in both Point-to-Point and MultiPoint modes, with
concentrations of Master units where it is necessary to reduce interference between the Masters. Please
contact FreeWave Technologies for more information.

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(9) 1 PPS ENABLE/DELAY

The 1 PPS Enable/Delay option allows the radio network to propagate a 1PPS signal from the Master to
all Slaves in a MultiPoint network. When this parameter is enabled a properly generated pulse applied on
the DTR line of the Master will provide a 1 PPS pulse on the CD line of any Slave in the network. To use
the 1 PPS Enable/Delay feature the steps outlined below must be followed:

1PPS Enable/Delay Setup:

1. The 1 PPS Enable/Delay parameter must be set to 0 in the Master.

2. The Master must have a 1 PPS pulse on the DTR pin.

3. The 1 PPS Enable/Delay parameter on the Slaves must be enabled. Slaves are calibrated at the

factory.

Calibrating a Slave in 1PPS Enable/Delay mode

1. Trigger an oscilloscope on the 1 PPS pulse on the DTR line of the Master.

2. Monitor the CD line of the Slave.

3. If the timing on the Slave differs from the Master it may be adjusted via the value in the Slave's 1

PPS Enable/Delay parameter. The difference in time between each incremental integer value is

542.534nS. Changing the parameter to higher values decreases the Slave time delay and
changing the parameter to lower values increases the time delay.

When properly calibrated the CD line of a Slave radio will output a pulse that goes high for about 2mS in
sync with the 1 PPS pulse on the Master radio. The output on the Slave will occur within 20
microseconds of the input to the Master.

Note: When 1 PPS is enabled, the Master must have a 1 PPS pulse on its DTR pin, otherwise the RF

network will not function.

(A)

SLAVE/REPEATER

Normally a repeater does not have the ability to provide data on the data port. When this capability is
necessary Slave/Repeater should be set to On. When using Slave/Repeater, the baud rate and
communication protocol must match the end device.

(B)

DIAGNOSTICS

This option provides diagnostics data to be viewed at the Master in parallel with application data. The
diagnostic program MUST be run from the Master transceiver. Diagnostics requires the following:

1. Diagnostics set to (1 to 128) in the Master.

2. A second computer or serial connection to run the diagnostics software.

3. A diagnostics cable. (Available from FreeWave Technologies.)

4. Diagnostics software. (Available on the User Manual and System Tools CD.)

For more information on Diagnostics, please contact FreeWave Technical Support at [phone].

(C)

SUBNET ID

The Subnet ID function only works in MultiPoint Networks utilizing the Network ID option. In a MultiPoint
Network, a Slave or Repeater will connect with the first Repeater or Master that it hears with the same
Network ID. However, where communications need to be forced to follow a specific path the Subnet ID is
quite useful. Subnet ID is particularly helpful to force two Repeaters in the same network to operate in series
rather than in parallel, or if desired, to force Slaves to communicate to a specific Repeater for load balancing
purposes. Two components exist with regard to the Subnet ID:

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1. Rcv Subnet ID. This setting identifies which transceiver a Repeater or Slave will listen to.

2. Xmit Subnet ID. This setting identifies the ID on which this device transmits, and in turn which

devices will listen to it. The Xmit Subnet ID parameter is relevant for MultiPoint Repeaters only.

The default (disable) setting for both Rcv and Xmit is F.
Notes: A Master will always transmit and receive on 0. With firmware of 2.40 and greater (900MHz) or

3.40 and greater (2.4GHz) the Master may be set to use alternate Subnet ID values. Changing
these settings on the Master is not recommended, under normal circumstances.

In some MultiPoint Networks, the FreqKey will be at the same setting for all transceivers. In other
networks, where parallel Repeaters are introduced, the FreqKey value will need to change. See
FreqKey and Repeater Frequency sections earlier in this manual for more information.

If both Rcv Subnet ID and Xmit Subnet ID are set to 0 the Subnet ID will show Roaming in the
menu. This setting will allow a mobile Slave to roam from subnet to subnet and possibly from
network to network.

This drawing depicts a Network in which Subnet IDs are used to force communications. In this example,
Repeater1 must talk directly to the Master; Repeater2 must talk directly to Repeater1. Slaves 1, 2, and 3
are forced along the direction of the solid lines. Slave4 may link to the first Master or Repeater it hears.

The respective Subnet ID diagram and settings are shown below.

(D)

RADIO ID

Option (D) allows a transceiver to be designated with an arbitrary, user selectable, 4 digit number whi ch
identifies the transceiver in diagnostics mode.

(E)

LOCAL ACCESS

Local Access is not to be used at this time.

(G)

RADIO NAME

Option (G) allows the user to set a unique 20 character Radio name.

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Radio Information

LRS-455 Data Transceiver Users Manual

Radio Statistics in the Main Menu allows the user to view data transmission statistics gathered by the
transceiver during the most recent session. This is valuable when the user needs to know the signal
strength and noise levels of the link. Statistics are gathered during each data link and are reset when the
next link begins. See display below.

UMBER OF DISCONNECTS

N

Any time the link between the Master and the Slave is broken and the radios lose Carrier Detect, it is
recorded in the Number of Disconnects value. The value indicates the total number of disconnects that
have occurred from the time the transceiver is powered on until the radio is put into Setup mode. Under
ideal operating conditions, the number of disconnects should be 0. One or more disconnects may indicate
a weak link, the presence of severe interference problems or loss of power to any of the radios in the link.

A

NTENNA REFLECTED POWER

This is a measurement of the transmitted power that is reflected back into the transceiver from
mismatched antennas or cables, or loose connections between the transceiver and antenna. A reading
of 0-5 is good; 5-30 is acceptable; 30+ indicates that the connections should be insp ected for loose
connections and cable quality.

A

VERAGE NOISE LEVEL

The average noise level indicates the level of background noise and interference at this transceiver. The
number is an average of the noise levels measured at each frequency in the transceiver’s frequency hop

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LRS-455 Data Transceiver Users Manual

table. The individual measurement values at each frequency hop channel are shown in the frequency
table. Pressing the Enter key when the Radio Statistics menu is displayed, accesses the frequency table.

Ideally, noise levels should be below -120 dBm units and the difference between the average signal level
and average noise level should be 26 dB or more. Noise levels significantly higher than this are an
indication of a high level of interference that may degrade the performance of the link. High noise levels
can often be mitigated with band pass filters, antenna placement or antenna polarization.

A

VERAGE SIGNAL LEVEL

The average signal level indicates the level of received signal at this transceiver. For each of these, the
signal source is the transceiver that transmits to it. The number is an average of the received signal levels
measured at each frequency in the transceiver's frequency hop table. The individual measurement values
at each frequency hop channel are shown in the frequency table. Pressing the Enter key when the Radio
Statistics menu is displayed accesses the frequency table. For a reliable link, the margin should be at
least 26 dB. Low Average Signal Levels can often be corrected with higher gain antennas and better
antenna placement.

Note: Please consult the install manual for antenna and FCC requirements.

O

VERALL RCV RATE (%)

The Overall Receive Rate measures the percentage of data packets that were successfully transmitted
from the Master to the Slave on the first attempt. A number of 75 or higher indicates a robust link that will
provide very good performance even at high data transmission rates. A number of 15 or lower indicates a
weak or marginal link that will provide lower data throughput.

R

ADIO TEMPERATURE

The Radio Temperature value is the current operating temperature of the transceiver in degrees Celsius.
For proper operation, a FreeWave transceiver must be in the temperature range of -30° to +60° C.

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Factory Default Settings

FreeWave 455MHz transceivers are shipped from the factory with the following Default Settings:

Operation Mode Default

Point to Point Slave 1

Set Baud Rate Default

Baud Rate 19200
(A) Data Parity 0
(B) Modbus RTU 0
(C) RS232/485 0
(D) Setup Port 3
(E) TurnOffDelay/OnDelay 0/0
(F) Flow Control 0

Radio Parameters Default

(1) MAX PACKET SIZE 9
(2) MIN PACKET SIZE 1
(3) XMT RATE 1
(4) RF DATA RATE 5
(5) RF XMT POWER 10
(6) SLAVE SECURITY 0
(7) RTS TO CTS 0
(8) RETRY TIMEOUT 255
(9) LOW POWER MODE 0
(A) High Noise 0
(B) MCU Speed 0
(C) Remote LED 0

MultiPoint Parameters

(1) MASTER PACKET REPEAT 0
(2) MAX SLAVE RETRY 9
(3) RETRY ODDS 0
(4) DTR CONNECT 0
(6) NETWORK ID 255
(7) RESERVED
(8) MULTI MASTER SYNC 0
(9) 1 PPS ENABLE DELAY 255
(B) DIAGNOSTICS 0
(D) RADIO ID Not Set

Default

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Additional Transceiver information

This section contains additional important information about FreeWave transceivers. The following topics
are included in this section:

 Operational RS422 and RS-485 Information
 RS232 Pin Assignments
 OEM Board Pin Assignments

Operational RS-422 and RS-485 Information

For both RS-422 and RS-485, the FreeWave transceiver can drive 32 standard unit loads and loads the
bus with only 1/8 unit load. This means the user can tie up to 256 devices on the bus if all of the line
receivers have 1/8 unit load.

RS-422 is used for 4-wire or full duplex communication with one Master and multiple Slaves. The
FreeWave Master transceiver keeps the line driver asserted at all times. The maximum line length is
4,000 feet using 2, 120 ohm twisted pair cables with a 5th wire for data common.

RS-485 full duplex using 4 wire plus common is the same as RS-422, except the system can have
multiple Masters on the bus.

The most common operation of RS-485 is a two-wire comprised of a 120 ohm impedance sin gle twisted
pair. In this system the loading of the FreeWave transceiver is as described above which allows up to 256
1/8 unit load units on the bus. Maximum line length is also 4,000 feet with a third wire required for data
common. The FreeWave transceiver will check the line to be certain no other device is transmitting before
enabling the line driver for data transmission.

When setting the transceiver to RS-485, enable Modbus and set Master Packet Repeat to 3 in the
transceiver(s) that will use RS-485. Also set TurnOff Delay to 4.

The TurnOffDelay setting in the menu is used to control the length of time the transmitter driver stays
asserted after data transmission has finished. This is needed to allow the last transmitted character to
reach the end of a long line and is normally set to one character length of time. This setting also allows 3
complete reflections to the end of the line to ensure the ringing on the line has fully dampened before
releasing the bus to another device. Shorter line lengths may use shorter delays, but four one-quarter­character delay times are recommended. In Modbus, a TurnOffDelay setting of 0 will cause internal timin g
errors.

There is no provision for hand shaking in any of the above modes of operation, so data rates of 57.6
KBaud and above are not recommended without a protocol that can handle error detection properly.

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RS-422

AND RS-485 FULL DUPLEX PIN-OUTS

Function Bare Board Pin Number DE-9 Pin Number

RX+ 7 3
RX- 9 7
TX+ 5 2
TX- 10 8
Signal Ground 4 or 6 5

RS-485 HALF DUPLEX PIN-OUTS

Function Bare Board Pin Number DE-9 Pin Number

Wire to both pins for Bus + Short 5 and 7 Short 2 and 3
Wire to both pins for Bus - Short 9 and 10 Short 7 and 8
Signal Ground 4 or 6 5

RS232 Pin Assignments

Pin Assignment Signal Definition

1 CD Carrier Detect Output Used to show an RF connection between transceivers.

2 TX Transmit Data Output

3 RX Receive Data Input

4 DTR Data Terminal Ready Input

5 GND Ground Signal return for all signal lines shared with Pin 9.
6 DSR Data Set Ready Output

Used to transmit data bits serially from the transceivers to the
system device.

Used to receive data bits serially from the system device
connected to the transceivers.

Used only in transceivers in Point-to-Point Slave/Master
switchable mode or for DTR Connect.

Always high when the radio is powered from the 2.5mm
power connector. Indicated power is on to the radio. Also,
this pin can be used for +12Volts when powering the
transceivers directly through the RS-232 port.

Note: This is not used on the OEM module.

7 RTS Request to Send Input

8 CTS Clear to Send Output

9 GND Ground Signal return for all signal lines shared with Pin 5.

LUM0016AA Rev A Version 1.0 30

The transceiver does not recognize RTS for flow control. RTS
is used as a control line in RTS/CTS mode.

This signal is used to tell the system device connected to the
transceiver that the transceiver is ready to receive data.
When asserted, the transceiver will accept data, when
deasserted the transceiver will not accept data. This should
always be used for data rates above 38.4KB or there will be a
risk of lost data if an RF link is not very robust.

LRS-455 Data Transceiver Users Manual

RF Board Pinout

The 400 MHZ Series transceivers are available in both TTL and RS232 versions.
The TTL versions use reverse polarity from standard RS-232 at 0 to 5 Volt levels. All pin descriptions and

pin numbering are the same as the RS232 version. The RS232 versions use standard RS232 polarity and
voltage levels for all of the RS232 signal lines (DTR, Transmit Data, Receive Data, Carrier Detect, RTS,
and Clear to Send) and TTL standard polarity and voltage level for the Interrupt pin.

Pin 1: B+ Power input.
Pin 2: Interrupt (INT) – Input – A 0 volt level on this pin will switch the radio into Setup mode.

Pin Assignment Color on ACS3610xx cable

1 B+ input Red
2 Interrupt (tem porarily ground to invoke menu) Brown
3 Data Termina l Ready (DTR) Orange
4 Ground Black
5 Transmit Data (TXD) Yellow
6 Ground Black
7 Receive Data (RXD) Green
8 Carrier Detect (DCD) Blue
9 Request to Send (RTS) Violet (purple)

10 Clear to Send (CTS) Gray

Note: Pin 1 on the board level transceiver is the pin farthest from the three LEDs and pin 10 is closest

to the LEDs.

FreeWave Technical Support

For up-to-date troubleshooting information check the Support page at www.FreeWave.com.
FreeWave provides Technical Support, Monday through Friday, 8:00 AM to 5:00 PM, Mountain Time

(GMT -7) Call us toll-free at 1-800-548-5616 or factory direct after hours at 303-444-3862 or email us
at [e-mail]

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Frequency List

The LRS-455 transceivers tune from 435MHz to 470MHz with a tuning resolution of 6.25KHz. This gives
a total of 5600 available channels. Using the license allowed frequency, the channel number can be
determined using the following formula.

Channel number = F

MHz

(160) – 69600

Note: This is a partial list. If the required frequency is not listed use the F
to obtain the appropriate channel number.

Channel# Frequency Channel # Frequency Channel # Frequency

0 435.000 2060 447.875 4120 460.750
20 435.125 2080 448.000 4140 460.875
40 435.250 2100 448.125 4160 461.000
60 435.375 2120 448.250 4180 461.125
80 435.500 2140 448.375 4200 461.250

100 435.625 2160 448.500 4220 461.375
120 435.750 2180 448.625 4240 461.500
140 435.875 2200 448.750 4260 461.625
160 436.000 2220 448.875 4280 461.750
180 436.125 2240 449.000 4300 461.875

MHz

formula

200 436.250 2260 449.125 4320 462.000
220 436.375 2280 449.250 4340 462.125
240 436.500 2300 449.375 4360 462.250
260 436.625 2320 449.500 4380 462.375
280 436.750 2340 449.625 4400 462.500
300 436.875 2360 449.750 4420 462.625
320 437.000 2380 449.875 4440 462.750
340 437.125 2400 450.000 4460 462.875
360 437.250 2420 450.125 4480 463.000
380 437.375 2440 450.250 4500 463.125
400 437.500 2460 450.375 4520 463.250

LUM0016AA Rev A Version 1.0 32

LRS-455 Data Transceiver Users Manual

Channel# Frequency Channel# Frequency Channel# Frequency

420 437.625 2480 450.500 4540 463.375
440 437.750 2500 450.625 4560 463.500
460 437.875 2520 450.750 4580 463.625
480 438.000 2540 450.875 4600 463.750
500 438.125 2560 451.000 4620 463.875
520 438.250 2580 451.125 4640 464.000
540 438.375 2600 451.250 4660 464.125
560 438.500 2620 451.375 4680 464.250
580 438.625 2640 451.500 4700 464.375
600 438.750 2660 451.625 4720 464.500
620 438.875 2680 451.750 4740 464.625
640 439.000 2700 451.875 4760 464.750
660 439.125 2720 452.000 4780 464.875
680 439.250 2740 452.125 4800 465.000
700 439.375 2760 452.250 4820 465.125
720 439.500 2780 452.375 4840 465.250
740 439.625 2800 452.500 4860 465.375
760 439.750 2820 452.625 4880 465.500
780 439.875 2840 452.750 4900 465.625
800 440.000 2860 452.875 4920 465.750
820 440.125 2880 453.000 4940 465.875
840 440.250 2900 453.125 4960 466.000
860 440.375 2920 453.250 4980 466.125
880 440.500 2940 453.375 5000 466.250
900 440.625 2960 453.500 5020 466.375
920 440.750 2980 453.625 5040 466.500
940 440.875 3000 453.750 5060 466.625
960 441.000 3020 453.875 5080 466.750

LUM0016AA Rev A Version 1.0 33

LRS-455 Data Transceiver Users Manual

Channel# Frequency Channel# Frequency Channel# Frequency

980 441.125 3040 454.000 5100 466.875
1000 441.250 3060 454.125 5120 467.000
1020 441.375 3080 454.250 5140 467.125
1040 441.500 3100 454.375 5160 467.250
1060 441.625 3120 454.500 5180 467.375
1080 441.750 3140 454.625 5200 467.500
1100 441.875 3160 454.750 5220 467.625
1120 442.000 3180 454.875 5240 467.750
1140 442.125 3200 455.000 5260 467.875
1160 442.250 3220 455.125 5280 468.000
1180 442.375 3240 455.250 5300 468.125
1200 442.500 3260 455.375 5320 468.250
1220 442.625 3280 455.500 5340 468.375
1240 442.750 3300 455.625 5360 468.500
1260 442.875 3320 455.750 5380 468.625
1280 443.000 3340 455.875 5400 468.750
1300 443.125 3360 456.000 5420 468.875
1320 443.250 3380 456.125 5440 469.000
1340 443.375 3400 456.250 5460 469.125
1360 443.500 3420 456.375 5480 469.250
1380 443.625 3440 456.500 5500 469.375
1400 443.750 3460 456.625 5520 469.500
1420 443.875 3480 456.750 5540 469.625
1440 444.000 3500 456.875 5560 469.750
1460 444.125 3520 457.000 5580 469.875
1480 444.250 3540 457.125 5600 470.000
1500 444.375 3560 457.250
1520 444.500 3580 457.375

LUM0016AA Rev A Version 1.0 34

LRS-455 Data Transceiver Users Manual

Channel# Frequency Channel# Frequency

1540 444.625 3600 457.500
1560 444.750 3620 457.625
1580 444.875 3640 457.750
1600 445.000 3660 457.875
1620 445.125 3680 458.000
1640 445.250 3700 458.125
1660 445.375 3720 458.250
1680 445.500 3740 458.375
1700 445.625 3760 458.500
1720 445.750 3780 458.625
1740 445.875 3800 458.750
1760 446.000 3820 458.875
1780 446.125 3840 459.000
1800 446.250 3860 459.125
1820 446.375 3880 459.250
1840 446.500 3900 459.375
1860 446.625 3920 459.500
1880 446.750 3940 459.625
1900 446.875 3960 459.750
1920 447.000 3980 459.875
1940 447.125 4000 460.000
1960 447.250 4020 460.125
1980 447.375 4040 460.250
2000 447.500 4060 460.375
2020 447.625 4080 460.500
2040 447.750 4100 460.625

LUM0016AA Rev A Version 1.0 35