Raveon FireLine MURS band, FireLine RF Technical Manual

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F i r eLine MURS b a n d

D a t a Radio Modem

T e c h n i c a l M a n u a l

Version D2

June 2006

Raveon Technologies Corporation

2722 Loker Avenue West, Suite D

Carlsbad, CA 92010

www.raveontech.com

Table Of Contents

1. General Information about the FireLine .........................................................4

1.1.

Congratulations!........................................................................................................................... 4

1.2.

NOTICE ....................................................................................................................................... 4

1.3.

Safety / Warning Information ....................................................................................................... 4

1.4.

Safety Training information: ......................................................................................................... 4

1.5.

FCC Compliance Information....................................................................................................... 6

1.6.

Features....................................................................................................................................... 7

2. Specifications.................................................................................................8

2.1.

General ........................................................................................................................................ 8

2.2.

Transmitter................................................................................................................................... 8

2.3.

Receiver....................................................................................................................................... 8

2.4.

User Input and Output Signals ..................................................................................................... 8

2.5.

Frequencies ................................................................................................................................. 9

3. Electrical Inputs and Outputs .......................................................................10

3.1.

LEDs .......................................................................................................................................... 10

3.2.

DC Power .................................................................................................................................. 10

3.3.

Serial I/O Connector .................................................................................................................. 11

4. Using the FireLine Modem – Packet Mode ..................................................12

4.1.

Setup ......................................................................................................................................... 13

4.2.

Selecting Channels .................................................................................................................... 14

4.3.

Data Transmission ..................................................................................................................... 14

Serial Port Baud Rate ..................................................................................14

Flow Control.................................................................................................15

Packet Size..................................................................................................15

Key-On_Data ...............................................................................................15

Busy-Channel Lock Out ...............................................................................15

4.4.

Data Reception .......................................................................................................................... 16

4.5.

Addressing (Packetized Mode only)........................................................................................... 16

Addressing Basics .......................................................................................16

Hexadecimal Numbers ................................................................................17

Setting A System-Wide Address..................................................................17

Broadcast Transmissions ............................................................................17

The Address Mask.......................................................................................18

Addressing Examples: .................................................................................19

4.6.

Error Correction ......................................................................................................................... 19

Using the FireLine Modem – Streaming Mode....................................................21

4.7.

Streaming Mode Operation ........................................................................................................ 21

4.8.

Baud Rate Selection .................................................................................................................. 21

4.9.

Bit Errors.................................................................................................................................... 22

4.10. Carrier Detect............................................................................................................................. 22

4.11. Serial Data Flow Control ............................................................................................................ 23

5. Installation....................................................................................................24

6. User Serial Port Commands ........................................................................25

6.1.

Overview.................................................................................................................................... 25

6.2.

Command Mode ........................................................................................................................ 25

6.3.

Setting a Parameter ................................................................................................................... 25

6.4.

Reading a Parameter................................................................................................................. 26

6.5.

CONFIG Button.......................................................................................................................... 26

6.6.

Exiting the Command Mode....................................................................................................... 27

6.7.

Restoring Factory Defaults ........................................................................................................ 27

6.8.

Command Mode Commands ..................................................................................................... 28

6.9.

Setting the Over-The-Air Data Rate ........................................................................................... 31

6.10. Debug Related Commands........................................................................................................ 31

7. FireLine Diagnostic Provisions.....................................................................33

7.1.

Overview of Diagnostics ............................................................................................................ 33

7.2.

Reading the Diagnostic Information ........................................................................................... 33

7.3.

Status and Statistics Command ................................................................................................. 33

7.4.

ATST Command ........................................................................................................................ 34

7.5.

ATST2 Command ...................................................................................................................... 34

7.6.

ATST3 Command ...................................................................................................................... 35

7.7.

ATST4 Command ...................................................................................................................... 35

7.8.

AutoStatus ................................................................................................................................. 35

8. Tune-up and Alignment ...............................................................................37

8.1.

Periodic Calibration.................................................................................................................... 37

8.2.

Radio Module Types .................................................................................................................. 37

8.3.

Center Frequency ...................................................................................................................... 37

8.4.

TX Deviation .............................................................................................................................. 38

8.5.

TX Modulation Balance.............................................................................................................. 38

8.6.

RX DC Offset Verification .......................................................................................................... 38

8.7.

RX Carrier Detect....................................................................................................................... 39

8.8.

MURS Operation........................................................................................................................ 39

9. SkyLine Compatibility ..................................................................................40

9.1.

General ...................................................................................................................................... 40

9.2.

Configuring FireLine to Communicate with a SkyLine................................................................ 40

9.3.

Use of the DM3472 Wide-band Module ..................................................................................... 40

10. Antenna Information.................................................................................42

11. Internal Radio Connection........................................................................44

12. Appendix A. Serial Port Hardware..........................................................45

12.1. Serial Port Data and Handshaking Signals ................................................................................ 45

12.2. Null modem without handshaking .............................................................................................. 47

12.3. Compatibility issues ................................................................................................................... 47

12.4. Null modem with full handshaking.............................................................................................. 48

12.5. Compatibility issues ................................................................................................................... 48

13. Troubleshooting .......................................................................................49

Symptom: Unit will not receive....................................................................49

Symptom: Unit will not transmit...................................................................49

Symptom: Long delay before transmitting ..................................................49

Symptom: Modified parameters are lost at power-up .................................49

Symptom: Cannot enter Command Mode ..................................................49

Symptom: Modem appears dead................................................................50

14. Mechanical ...............................................................................................51

15. Limited One Year Warranty......................................................................52

1. General Information about the FireLine

1.1. Congratulations!

Congratulations on your purchase of a FireLine radio modem.

Please take a few minutes to read this manual carefully. The information presented here will allow you to derive maximum performance from your radio modem. After reading it, keep the manual handy for quick reference, in case questions arise later on.

1.2. NOTICE

There are no user-serviceable points inside this transceiver. All service work must be referred to your Authorized Service Center or Raveon Technologies Service Department.

1.3. Safety / Warning Information

WARNING - DO NOT operate theRV-M5-U radio modem when bystanders are within 2 feet (.6 meters) of the antenna.

Blasting Caps and Blasting Areas

To avoid possible interference with blasting operations, turn off this radio or remove the DC power when you are near electrical blasting caps, in a blasting area, or in areas posted: “Turn off two-way radio.” Obey all signs and instructions.

Potentially Explosive Atmospheres

Turn off your radio prior to entering any area with a potentially explosive atmosphere. Do not install this product for use in areas with potentially explosive atmospheres. Do not remove, install, or charge batteries in such areas. Sparks in a potentially explosive atmosphere can cause an explosion or fire resulting in bodily injury or even death.

Note:

areas such as below decks on boats, fuel or chemical transfer or storage facilities, areas where the air contains chemicals or particles, such as grain, dust or metal powders, and any other area where you would normally be advised to turn off your vehicle engine. Areas with potentially explosive atmospheres are often but not always posted.

The areas with potentially explosive atmospheres referred to above include fueling

1.4. Safety Training information:

Antennas used for this transmitter must not exceed an antenna gain of 0 dBd. The radio modem must be used in fixed vehicle-mount configurations or at fixed base-station sites. It is not intended for portable applications.

This radio is restricted to occupational use, work related operations only where the radio operator must have the knowledge to control the exposure conditions of its passengers and bystanders by maintaining the minimum

separation distance of following range. Failure to observe these restrictions may result in exceeding the FCC RF exposure limits.

Antenna Installation:

For rear deck trunk installation, the antenna must be located at least the following range away from rear seat passengers and bystanders in order to comply with the FCC RF exposure requirements.

For Model

RV-M5-M:

Radiated frequency and Distance

RV-M5-M

1.97 Feet (0.6 m)

FCC ID: SRS-RV-M5-M

Raveon Technologies Corporation

For vehicular roof top installation, the antenna must be placed in the center of the roof.

1.5. FCC Compliance Information

This device complies with 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.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE: The manufacturer is not responsible for any radio or TV interference caused by unauthorized modifications to this equipment. Such modifications could void the user’s authority to operate the equipment.

This product also complies with FCC Part 95 Subpart J of the FCC rules and regulations.

The Federal Communications Commission (FCC), with its action in ET Docket 93-62, has adopted a safety standard for human exposure to Radio Frequency (RF) electromagnetic energy emitted by FCC-certified equipment. This product meets the uncontrolled environmental limits as stated in OET65C (01-01) when operated in accordance with the operation guidelines described in this manual. Proper operation of this radio device according to the instructions in this publication will result in user exposure substantially below the FCC recommended limits.

This equipment generates, uses, and radiates radio frequency energy, and if not installed and used in accordance with the instructions, may cause harmful interference. However, there is no guarantee that interference will not occur. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to correct the interference by one of the following measures:

• Reorient or relocate the receiving antenna.

• Increase separation between the equipment and receiver.

• Connect the equipment to an outlet on a circuit different from which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician.

Antenna height is limited to 20 feet above a structure or 60 feet above the ground whichever is greater (47 CFR 1315).

MURS radios must not be connected to a “booster” or power amplifier. The rules limit the Transmitter Output Power (TPO) to 2 Watts (47 CFR 95.1311).

MURS radios are prohibited from connecting to the public switched telephone network (47 CFR 95.1313).

Overview

The FireLine RF data radio is a rugged high-performance, high-speed narrowband data modem. It contains a receiver, a transmitter, and modem, creating an easy-to-use transparent data radio link. The FireLine’s user interface is asynchronous RS-232 data into and out of the FireLine (CMOS level optional). Modem operation is virtually transparent to the user and the configuration of the modem is via the user serial port.

Unlike any other radio modem on the market, the FireLine may be operated in either a “Packetized Mode” or a “Streaming Real-Time Mode”. There are advantages to each approach, and your choice depends upon how your system operates.

For privacy and network versatility, the FireLine incorporates a 16 bit identification code. Its protocol also uses a 16bit CRC to guarantee the integrity of the data. Perfect for SCADA and telemetry applications, the FireLine can be used for simple point-to-point data communication applications, or for more sophisticated point-to-multipoint, peer-to-peer, or mesh networks.

Although the FireLine is the easiest to use modem on the market, its reprogrammability makes it extremely versatile. Most parameters within the modem may be re-configured to optimize it for specialized operations, extended range, or higher data throughput.

1.6. Features

•

High-speed over the air data rates. 19200bps in 25kHz channel, 9600bps in 12.5kHz.

•

Built-in radio transceiver with integrated modem

•

Easy to use. Plug-in, Turn-on, and GO. Transmit data in = Receive data out.

•

Lowest current draw in industry.

•

Wide input voltage with high-efficiency switching voltage regulator.

•

Integrated Packet data protocol and built-in Streaming Real-Time operation.

•

ARQ error correction and retransmission capability. Totally transparent to the application.

•

Capable of store-and-forward repeating operation.

•

Small sized and very rugged extruded enclosure.

•

16 bit addressing for up to 65,525 different unique device addresses per channel

•

Supports group and broadcast transmissions. Network mask allows groups of any size.

•

2 watts of RF output. Other RF power levels available upon request.

•

Easily configured using “AT” commands

•

Very fast Transmit-to-Receive turn around time.

•

RS-232 serial input and output. Programmable serial baud rates up to 57600.

•

Programmable over-the-air data rates for long-range or high-speed

•

Automatic key of transmitter on data.

•

RF carrier-detect is not required receiving. No squelch setting required.

•

SkyLine compatibility mode for use in older Sonik radio systems.

2. Specifications

2.1. General

All measurements made per TIA-603-B

Size (inches) ......................................................................................................... 3.0D X 3.76W X 1.40H

DC input voltage ......................................................................................................................... 9-16V DC

Typical current draw, receiving, over-the-air rates < 4800bps ........................................................ <80mA

Maximum current draw, receiving, over-the-air rates >= 4800bps ................................................ <110mA

Current draw when transmitting data .....................................................<1.7A max, 1.5A typical at 2watts

Frequency stability ....................................................................................................................... ±1.5ppm

Over-the-air baud rates (programmable) .................................. 800, 1200, 2400, 4800, 5142, 8000, 9600

Internal data buffers (transmit and receive) ............................................................................ >2000 bytes

Operating temperature range.................................................... -30ºC to +60ºC (-30ºC to +80ºC storage)

TX-RX and RX-TX turn-around time ............................................................................................... <15mS

Power on time to operational ........................................................................................................ <500mS

FCC ID Model RV-M5-M ............................................................................................SRS-RV-M5-M

2.2. Transmitter

Maximum RF power output.......................................................................................................... 2.0 watts

Maximum duty cycle ....................................................................................................... 20% at full power

Maximum transmit frequency deviation.......................................................................................± 2.25kHz

Occupied bandwidth ..................................................................................... 11 kHz (12.5kHz channels)

TX spurious outputs ..................................................................................................................... < -70dBc

Emissions designator...................................................................................11K0F1D (12.5kHz channels)

2.3. Receiver

Typical RX sensitivity (1% BER)

9600bps, 4-level, 12.5kHz channel ........................................................................ -109dBm

4800bps, 2-level ..................................................................................................... -113dBm

2400bps.................................................................................................................. -116dBm

1200 and 800bps.................................................................................................... -118dBm

RX selectivity .................................................................................................................................... -50dB

Spurious and image rejection ........................................................................................................... -60dB

RX intermodulation rejection.......................................................................................... -60dB at 2400bps

Conducted spurious emissions .................................................................................................... <-20dBm

2.4. User Input and Output Signals

Serial port baud rates........................................................ 1200, 2400, 4800, 9600, 19200, 38400, 57600

Voltage levels ...................................................................................................... RS-232 complaint levels

Modem handshake signals .............................................................................. RTS, CTS, DTR, DSR, CD

RF I/O ......................................................................................................................... 50 ohm BNC

Power .............................................................................................................B+ input and Ground

2.5. Frequencies

The RV-M5-M MURS modem has five user selectable channels. The channel is selected with the ATHP command. The RV-M5-M modem is factory-set to these five channels, and the modem cannot be programmed to operate on any frequency other than these five.

1 151.820 MHz 2 151.880 MHz 3 151.940 MHz 4 154.570 MHz 5 154.600 MHz

3. Electrical Inputs and Outputs

The front panel of the FireLine modem has these features:

1. RF connector

2. Transmit LED (TX)

3. Receive LED (RX)

4. Power LED (PWR)

5. 9-Pin Serial I/O connector

6. DC Power Jack

3.1. LEDs

The three status LEDs visually show the current status of the radio.

Transmit LED (TX) This LED blinks red when the transmitter keys and is

putting out RF power.

Receive LED (RX) This LED glows red when there is an RF signal on the

radio’s receive frequency. This LED will indicate the presence of any signal, even one from other sources or radios, data, or voice. If it glows steadily at all times, there is probably some other user on the radio channel. The RF threshold level where this LED illuminates is programmable.

Power LED (PWR) This LED does a short blink, once every two seconds,

indicating to the user that the power to the modem is ON and the modem is working. When the modem is in the command mode, this LED will blink on and off, once per second. In the normal operating mode, this led will also blink red with each reception when FireLine data is received over the air.

3.2. DC Power

DC power for the modem is connected to the 2-pin DC power input jack labeled wire is positive (+) and the black wire is negative (-). Its connection is optional, as the user may alternately apply power to Pin 9 and ground to pin 5 of the 9-pin I/O connector.

The FireLine modem is supplied with a DC power cable, Raveon part number 4C660. The connector housing on the DC power cable is a MOLEX 50-57-

9402. The pins used in the housing are MOLEX 16-02-1125. The crimp tool for the connector pins is a Molex part number 11-01-0209.

DC IN. Use the supplied cable to connect the DC power. The red

3.3. Serial I/O Connector

The 9-pin serial I/O connector is a female 9-p D-subminiature connector having the following pins configuration.

Front-view of DB-9 connector on modem (female)

Pin # Name

1 CD out Carrier detect If enabled, indicates presence of carrier. 0

2 RxD out Receive data Data out of the modem. 3 TxD in Transmit data Data into the modem. 4 DTR in Data terminal ready 5 GND Ground connection Signal and power ground

6 DSR

7 RTS

8 CTS

9 Power

Note: RS-232 signals use positive and negative voltages to represent digital 1s and 0s. A positive voltage is a 0, and a negative voltage is a digital 1.

Dir Function Level / Specification

means carrier is present. If disabled, it is asserted (0) whenever the modem is operational, and not in the configuration mode. It will be a 1 when the modem is in the configuration mode.

Normally ignored by the FireLine modem.

out

In/out

Data Set Ready

Request to send

Clear to send

DC power (not Ring

signal)

Normally is set to 0 when modem is powered on. Used to stop/start the flow of data coming out of the modem TxD pin. 0 = OK to send, 1 = don’t send. Leave disconnected if not used. Used to stop the flow of data going into the RxD pin from the device connected to the FireLine. 0 = OK to send, 1 = don’t send. If the FireLine cannot accept more data, it will negate this signal (set to a 1). User may supply the DC power to the modem on this pin.

This pin-out allows it to be directly plugged into a computer’s 9-pin serial port using a conventional 9-pin RS-232 serial cable. To connect it to a modem, or computer peripheral that has a serial port, you will need a “null-modem” cable. See Appendix A for more information on wiring a null-modem cable.

4. Using the FireLine Modem – Packet Mode

This section describes the operation of the when it is in the Packet Mode of operation. Packet Mode is the factory-default operating mode. It is the easiest and most reliable mode of operation for a modem. Note: The configuration of the FireLine is done when the FireLine is in the “Command Mode”. Refer to Section 6 on page 25 for details on all of the available commands and programmable features.

In Packet Mode, all transmissions are sent in bursts or packets, and contain address, error detection, and error correction information. Date enters the FireLine modem’s serial I/O port, and is stored in a buffer within the modem until it is ready to be transmitted. Packetized operation has these advantages over non-packet modems:

Packet Mode Advantages

Error Detection The modem uses a 16-bit CRC at the end of every

packet of data. The CRC is used to check the data for errors, and if there are any errors, the data will not be passed onto the user.

Error Correction Automatic error correction may be used. FireLine

2. modems incorporate an optional ARQ method to re-transmit packets with error, to ensure the user’s data is delivered error-free.

Addressing Packetized operation allows for a more versatile network

architecture, with source, destination, and network addresses. FireLine uses a 16-bit address to identify data packets.

No Dribble Data Even in the presence of noise, the FireLine modem will

4. not output extra data or have random bit errors. Modems without packet operation generally do not work well with weak noisy signals.

Transparent Operation Because of the high-reliability and error-free

5. operation the Packet Mode offers the user, most user applications will seamlessly work using the FireLine in its Packet Mode.

Repeatable and Routable. FireLine packets are structured so that they

may be repeated using a store-and-forward repeater, and/or routed using specialized hardware.

1. Low Latency The transmitter will key-up immediately upon the user’s first

byte of data entering the modem. Packetized operation waits until a packet has been loaded before keying. (Although high serial-port data rates can minimize this packet latency to a negligible level).

2. Data with Errors The FireLine will continue to receive data, down into the

noise-floor of the radio. If the channel is noisy or the signal is weak, there may be bit-errors in the data, or the FireLine may output additional noise data. User applications must (and often do), take this into account, and

Streaming Mode Advantages

thus can operate with weaker signals and have longer communication range.

Figure 1 (Packet Mode of Operation)

For operation of the modem in the streaming data, non-packetized mode, see the section Streaming Mode on page 21. The Packet or Streaming operation is configured using the ATMT command, with Packet Mode being the factory default.

4.1. Setup

1. Connect a DC power source to the DC IN connection on the front of the modem.

2. Connect a good quality antenna, cut to the operating frequency, to the BNC connector on the front of the modem. Use a good antenna, and place is at high-above obstructions as possible.

3. Connect a computer terminal, or PC computer running HyperTerminal, to the 9-pin I/O connector. The factory default serial ports settings are 9600 bps, 8 data bits, 1 stop, no parity.

4. Program the modem’s operating frequency to your desired operating frequency. This is done with the ATFX xxx.xxxxx command. See the section “Serial Port Commands” for information describing the various parameters that may be modified in the modem. In most applications, the default settings from the factory will work fine.

Using the AT commands, change any of the default operating parameters that must be modified. From the factory, the modems are configured and shipped ready-to-use. Out of the box, they will communicate on the

default radio channel using the factory defaults. In general, the parameters you may want to modify will be:

ATFX Frequency for this channel. Set to your frequency. ATMT 0 0 for normal Packetized operation. Default mode. ATAK 0 for no ARQ, 1 if this unit sends ACKs. Default is no ARQ. ATRB Set the number of retries if ARQ is used (x). 0 if no ARQ used.

Factory default is no ARQ.

ATBD Serial port baud rate ATMY The ID of this unit. Default is 1234. ATMK The network address mask. Default is FFFF. ATDT The address of the unit this modem will talk to. Default is 1234. ATBC Enable/disable busy channel lock-out. Default is off, 0.

6. Connect your serial data device to the 9-pin connector on the front of the modem.

The radio is now ready to use. Any serial data going into the modem will be transmitted over the air, and any data received over the air will be sent out the serial port.

Remember, that from the factory, all FireLine modems are configured to simply work. Plug in power and connect to the serial port at 9600 baud, and the modems will communicate on the default channel. Change the channel frequency to your specific frequency, and they will be ready to work on your channel.

4.2. Selecting Channels

The RV-M5-M MURS Band FireLine modem has 5 channels in its memory bank. A channel is a pair of frequencies, one for transmit and one for receive. To select or change a channel use the ATHP x command, where x is the channel number.

If the channel number is changed using the ATHP command, and power is later lost, the channel number will be retained in non-volatile memory as long as was saved using the ATSV (Save to non-volatile memory) command.

4.3. Data Transmission

To transmit data, simply send one or more bytes of data into the serial port of the modem. When a full packet of data has been collected into the internal buffer of the modem, or when there is a pause in the data, the modem will automatically key its transmitter, and send the data over the air.

Serial Port Baud Rate

While the modem is transmitting, the user may continue to send more data into the FireLine. Because the buffers in the FireLine are full-duplex, the serial port data rate and the over-the-air data rates are independent. The serial port baud-rates may be set slow to accommodate legacy equipment, or set at high-speed to minimize latency. The over-the-air data rate us usually 4800

baud for narrow-band channels, and 9600 baud for wide-band, although faster or slower rates may be used.

In Packet Mode, selection of the serial port baud-rate is important. As shown in

Figure 1 (Packet Mode of Operation) above, if the serial port baud-rate is the same as the over-the-air baud rate and the packets are short, the channel utilization is only about 50%. But, if the serial port baud rate is set much higher, say 2-8X the over-the air rate, the channel utilization becomes near 100%.

Because the FireLine can handle serial-port data rate far in excess of the over-the-air rate, the efficiency of the FireLine in Packet Mode is approximately the same as other brand modems that cannot operate in a Packet Mode — with the added benefit or ARQ, error-free data, and addressing.

Note that many Windows applications which use the serial port, such as HyperTerminal, put large gaps between the bytes of data they send out the serial port. If an application is not getting the desired throughput, verify that it is not an artifact of the Operating System or the computer.

Flow Control

If large amounts of data will be sent with the FireLine, it may be possible to overflow the internal data buffer. To ensure the transmit buffer does not overflow, enable and use hardware flow control. Hardware flow control is enabled with the ATCH 1 command. Note that the FireLine modem will always indicate the status of its internal buffer using the CTS signal on the DB-9 serial connector. When CTS is negated, the internal buffers are more than 80% full. When it is asserted and it is “Clear to Send”, the buffers are less than 80% full.

Packet Size

The over-the-air packet size may be set with the ATTT xx command. Once the modem receives one full packet of data into via the serial port, it will automatically key the transmitter and send the data. Factory default is 80 bytes.

Key-On_Data

When serial data is entering the FireLine’s RS-232 port, the FireLine looks for pauses in the data as indication that it is time to send a packet of data over the air. The factory default duration of the pause it looks for is 20mS, but the user may change this to over values using the ATR3 xxx command, where xxx is in milliseconds.

Busy-Channel Lock Out

If your system operation require the FireLine modem to monitor-beforetransmit, of if you do not want the FireLine to transmit on a channel that is busy, you can enable “Busy-Channel-Lockout”, using the ATBC 1 command.

ATBC 0 disables BCL, and thus the modem will transmit whenever it has data to send out. The factory-default is BCL disabled. Use caution when enabling it, as a CW interferer, PC with poor shielding, or some other source of RF can stop the modem from transmitting. The threshold where the FireLine senses RF carrier, and determines that the channel is busy is set by the ATRA command. This is factory calibrated to an equivalent RF level of approximately -110dBm.

4.4. Data Reception

When the modem receives data over the radio, it checks it for errors, and if it is error-free, it will send it out the serial port. Again, the serial port may be set to any baud rate the user wishes, and the radio receiver and transmitter will continue to operate independently of the baud rate.

When the modem receives a signal, it will assert the CD hardware signal on the RS-232 serial port if it was configured to do so.

In general, the slower the over-the-air data rate, the easier it is for the modem to receive the signal, and thus the more communication range the radio will have. FireLine modems have a unique switched-filter along with digital signal processing, that gives them more range a lower data rates. See Section 6.9 Setting the Over-The-Air Data Rate for more information about choosing the over-the-air data rate.

4.5. Addressing (Packetized Mode only)

Addressing Basics

One of the more powerful aspects of the FireLine modem is its addressing scheme. Incorporating addressing in the modem allows multiple radio systems on the same frequency to co-exist, and not interfere with each other. Also, some user application cannot tolerate receiving data that was not intended for it, and by setting the addresses in the modems properly, the system can be configured to allow reception of only data intended for the recipient.

If addressing is not needed or desired, it can be turned off so that all modems receive data from all other modems, and all modems can talk to all other modems.

Each FireLine contains a 16 bit address, called its Unit Address, and is represented as a 4 digit hexadecimal number. FireLine address may be any number between 0000 and FFFF, which is effectively 65,535 different addresses. Every FireLine has a Unit Address programmed into it, as well as the ID of the unit it will send data to. The Unit Address is programmed with the ATMY xxxx command, and the Unit Address of the destination modem (the Destination Address) is configured with the ATDT xxxx command.

The defaults UNIT ID in al FireLine modems is 1234, and 1234 is the default for the destination ID. An Address Mask is used to select which digits of the address will be used to determine if a particular reception was intended for

the FireLine modem. The default Address Mask is FFFF, which means all digits will be used.

Hexadecimal Numbers

For those not familiar with hexadecimal numbers, a hexadecimal digit represents a 4-bit binary pattern. There are 16 possible values (0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,and F). These 16 values represent 4 bits of information, thus 4 hexadecimal digits can represent 16 bits of information. The hexadecimal numbers represent 4 bit data in the following way:

Hexadecimal Table

Hex # Binary Hex # Binary Hex # Binary Hex # Binary

0 0000 5 0100 8 1000 C 1100 1 0001 6 0101 9 1001 D 1101 2 0010 7 0110 A 1010 E 1110 3 0011 8 0111 B 1011 F 1111

When communicating over the air, FireLine modems transmit their Unit Address and the Destination Address along with the data. Receiving modems check the received Destination Address, and see if it matches their Unit Address. If it does match, the receiving modem outputs the data it received via its serial port. If it does not match, the receiving modem discards the data, and does not send it out the serial port.

Setting A System-Wide Address

If individual addressing is not needed in your system, there are two ways to ensure it is not used. One way is to set all modems in the system with the same Unit Address and destination address. From the factory, these are both set to 1234, and thus, all modems can communicate with all other modems, using the address 1234. The advantage of using this system-wide address, is that if there are other FireLine modems on the channel, but in some other system, they probably will not have the same Unit Address, and thus will not interfere with your system. To reduce the possibility of data cross-talk, the system implementer may wish to use a different system-wide address for the Unit Address instead of 1234. There are over 65,000 addresses available.

An alternate way to disable addressing altogether, is set the Address Mask to 0000 (ATMK 0000 command). This tells the FireLine to ignore the address, and receive every transmission. The disadvantage to this method is the adjacent-system problem. If there is another FireLine system on the same channel, all modems with the 0000 mask will receive them also.

Most users who do not use individual modem addressing, choose to set a global system address, and have all modems in their system use the same Unit ID and same destination address.

Broadcast Transmissions

The double FF is used to identify a broadcast packet. A transmission with a two digit FF in the first two positions of the destination ID, or in the last two positions of the destination ID, will be interpreted as a broadcast, and any

modem with an ID that matches the two non-FF digits will receive the data.

AND

“AND”

For example, sending data with a destination ID of 12FF will be received by any modem with a unit ID 1200 through 12FF. Sending data with a destination ID of FF34 will be received by any modem with a unit ID of 0034 through FF34.

The Address Mask

The reason to use hexadecimal digits to represent the unit address, is that along with the Unit Address programmed into the FireLine, there is an “Address Mask” programmed into it. The default mask is FFFF. The address mask is also used to determine if a particular data transmission should be received by the modem. For most applications, where one modem talks to one modem, or where all modems in the system communicate with all other modems in the system, the Address Mask should stay set to FFFF.

Only in systems where some modems should only talk to certain other modems, might you want to change the address mask. Whenever data is received over the air, the Destination Address of the transmission is logically “ANDed” with the Address Mask in the receiving modem. This is the Effective Destination Address. The receiving FireLine also ANDs its own Unit Address with its Address Mask. The result is the Effective Unit Address. The Effective Unit Address is compared to the Effective Destination Address, and if the two are identical, the data will be received.

Note: Logically 1

FireLine receives

data over-the-air to

Destination Address

“

together

AND

xxxx

” them

1 = 1, 0

` Figure 2 (Address Filtering)

AND

0 = 0, 1

FireLine has

Address Mask

zzzz

Compare the two

results from these

two ANDs

Output the data via

serial port if the two

results were

identical

AND

0 = 0, 0

AND

1 = 0

FireLine has

Unit Address

them

together

One effect of this is that an address mask of 0000 will cause the FireLine modem to received any data from any unit that transmits. The Destination Address will effectively be ignored if the mask is set to 0000.

Addressing Examples:

Example 1 (default configuration)

Sending Destination Address = 1234

Receiving Unit Address = 1234

Receiving Unit’s Address Mask = FFFF

Result: Unit will receive the data, because the addresses identically match. When the addresses are identical, the value of the mask is not important.

Notes: This is the default configuration. All units have address 1234, and all modems will talk to all other modems with address 1234.

Example 2 (a configuration that won’t work)

Sending to Destination Address = 1236

Receiving Unit Address = 1234

Receiving Unit’s Address Mask = FFFF

Result: No data will be received, because the address do not match, and the address mask of FFFF requires that all digits in the address match. .

Example 3 (able to receive a data from a group, 1230 – 123F)

Sending to Destination Address = 1236

Receiving FireLine Unit Address = 1234

Receiving FireLine Address Mask = FFF0

Result: Data will be received. 1236 ANDed with FFF0 is 1230. 1234 ANDed with FFF0 is 1230. The results of the ANDing match, and thus the data will be received.

Example 4 (able to receive from a group, xx34 where xx is any two digits)

Sending Destination Address = 2234

Receiving FireLine’s Unit Address = 1234

Receiving FireLine’s Address Mask = 00FF

Result: Data will be received. 2234 AND 00FF equals 0034. 1234 AND 00FF equals 0034, therefore they match. The results of the ANDing match, and thus the data will be received.

4.6. Error Correction

The FireLine modem has a built-in error correction mode, commonly referred to as Automatic Repeat request (ARQ). It works by checking each reception for errors, and if the data is OK, it sends a short “ACK” packet back over the air telling the sending station the data was OK.

The FireLine modem uses a traditional Carrier Sense Multiple-Access (CSMA) algorithm with randomized re-try time slots to determine when to retransmit packets that must be re-sent. The duration between re-tries increases as the number of attempts increases.

If received data has an error in it or if the receiving modem does not get the data due to interference, the receiving modem does not send the ACK back, and the sending station will automatically re-send the data. There are two aspects to configuring ARQ:

1) Enable the ARQ mode in the modem to allow it to transmit ACKs

(ATAK 1 command). This command enables the modem to transmit ACK packets.

2) Configure the number of retries the modem should attempt if an

ACK packet is not received back when it sends data (ATRB xx command). For example, if you set ATRB to 5 with the ATRB 5 command, the modem will wait for an ACK whenever it sends data. If it receives and ACK back from the modem that it sent data to, it will do nothing more. But if it does not receive an ACK, it will resend the same data, trying up to 5 more times.

The factory default condition is not to send or require ACK packets, so if you wish to use this mode, program the FireLine to transmit ACKs with the ATAK 1 command. This will cause the modem to send an ACK anytime it receives data from another modem. Note: If the destination address was a broadcast (FFFF, FFxx, or xxFF), it will not wait for an ACK.

The number of times it retries to send data that does not get through (does not get an ACK) is up to the user, but a number of 5 is usually a good compromise. If after 5 times, the data does not get through, then there probably is something seriously wrong with the channel or system.

The retried-transmissions are randomly spaced at intervals between approximately 200mS and 400mS, increasing by 50mS for each attempted transmission. Once the modem has sent its data the number of times the user specified in the ATRB xx command, the data is discarded, and the modem will continue to operate as normal.

It is very important that if one modem is configured to send ACK packets (ATAK 1) that all other modems communicating with it are also set to expect ACK packets using the ATRB xx command.

To disable ARQ (the default condition of the modem), disable ARQ with the ATAK 0 and

set retries to zero with the ATRB 0 command.

Using the FireLine Modem – Streaming Mode

This section describes the operation of the Streaming Mode of operation. This mode is selected with the command ATMT 2.

4.7. Streaming Mode Operation

In Streaming Mode, radio transmissions will begin whenever data enters the mode, and the transmission will continue as long as there is data to send. The transmitter will automatically key when data enters the modem, and there is no need to assert any control lines. It will automatically de-key when there is no more data to send.

Figure 3 illustrates the difference between the Packet Mode and the Streaming Mode of operation.

` Figure 3 (Streaming Mode of Operation)

For operation of the modem in the Packetized Mode, see the section on page 12 entitled Using the FireLine Modem – Packet Mode.

4.8. Baud Rate Selection

In Streaming Mode, the user data may still enter the modem at any baud rate, as set with the ATBD x command. The FireLine modem will buffer the data

and send it out over the air in the same order as it enters the modem. When the buffer is empty and there is no more data coming into the modem, it will automatically de-key the radio and go back into the receive mode. The FireLine modem will send a hidden end-of-message signal to the receiving modem, thus avoiding any extra data bytes “dribble bytes” from coming out of the user serial port. When the modem is operating with very weak signals, the end-of-message signal may be obscured, and missed by the receiving FireLine. In this case, additional noise bytes may come out of the user serial port.

While receiving, the modem will also output the receive data out the serial port at the rate set by the ATBD command. If the serial port baud-rate is slower than the over-the-air rate, an internal buffer in the FireLine modem will hold the data as it is sent out the serial port.

4.9. Bit Errors

Unlike Packet Mode operation, there is no error-detection nor error-correction in the Streaming Mode, so user data may contain bit errors. The user’s application must be able to handle these errors or additional bytes of noise data.

If the application that is using the FireLine cannot tolerate have erroneous data when the channel is noisy, the modem should be operated in the Packet Mode instead of Streaming mode ( In Packet Mode, data is always first checked for bit-errors, and never outputted if it detects any errors).

The end of a transmission is detected by the receiving modem by the presence of a special end-of-message signal. Transmitting FireLines automatically put the end-of-message signal out after the user’s data has been transmitted. If the receiving modem does not receive this signal (due to noise or interference), the receiving modem may continue to output some more data, until it detects that the RF carrier is gone, or the received signal is actually noise. This may take a byte or two of time, and during this time period, the receiving modem may output random noise bytes.

4.10. Carrier Detect

To reduce, and virtually eliminate bit errors and additional noise bytes, the user may configure the FireLine to require and RF carrier Detect before receiving any data. Because the RF carrier Detect Threshold is set above the noise-floor of the receiver, bit-errors will be rare if RF carrier is required to receive. By default, the FireLine does not require RF carrier detect to receive. To enable it, use the ATRF 1 command. To disable the need for RF carrier detect, us the ATRF 0 command (Factory default).

When ATRF is 0, the modem will be more sensitive, and be able to receive weak signals, but there is more likely to be bit errors when the signals are weak.

4.11. Serial Data Flow Control

If large amounts of data will be sent with the FireLine, and the serial port is operated at a faster data rate than the over-the-air rate, it may be possible to overflow the internal data buffer. To ensure the transmit buffer does not overflow, enable and use hardware flow control. Hardware flow control is enabled with the ATCH 1 command. Note that the FireLine modem will always indicate the status of its internal buffer using the CTS signal on the DB-9 serial connector. When CTS is negated, the internal buffers are more than 80% full. When it is asserted and it is “Clear to Send”, the buffers are less than 80% full.

5. Installation

1. Secure the FireLine modem using the four mounting holes on the side flanges of the unit.

2. Connect a DC power source to the DC IN connection on the front of the modem. Use the supplied cable, and connect the RED wire to +, and the black wire to – (ground). The black wire and the case of the FireLine should be connected to earth ground.

3. Connect a good quality antenna, tuned to the operating frequency, to the RF connector on the front of the modem. Use a good antenna, and place is at as high-above obstructions as possible.

4. A separation distance of at least 20 centimeters must be maintained between the transmitter's radiating structures and the body of the user or nearby persons.

5. Connect the computer, terminal, controller, or other hardware device that will be using the FireLine modem to its DB-9 serial I/O connector using a shielded cable. Secure it to the FireLine with the two mounting screws on the sides of the DB-9 connector.

6. If the antenna is mounted out doors, us a lighting arrestor in-line with the antenna, and properly ground the antenna and the FireLine chassis to an earth ground.

6. User Serial Port Commands

6.1. Overview

The asynchronous serial portion the RF modem is used to send and receive data over the air, as well as to configure the RF modem. In normal operation, the user sends data into the TxD pin of the user port, and this data is transmitted over the air. Received data from another RF modem is output to the user via the RxD pin of the user port. This is the default operating condition of the RF modem. No special characters, hardware control lines, or timing is required to operate the FireLine modem.

There is also a “Command Mode” used to program and configure the FireLine. In the Command Mode, the FireLine modem accepts commands via the serial port TxD pin. The commands can be used to change certain internal parameters of the FireLine modem as well as to read-out the current configuration and diagnostic statistics.

6.2. Command Mode

The FireLine modem may be put into a “Command Mode”, by entering a sequence of three plus characters (+++). To keep the FireLine modem from unintentionally entering the Command Mode because of the +++ pattern occurring in a stream of data entering the modem, there must be a pause in the data stream before the +++ as well as a pause after the +++ is sent. If either pause is missing, the modem will not enter the command mode.

Using serial communications software such as HypterTerminal, send the 3character command sequence “+++” while observing times of silence before [BT (Silence Before Sequence) Command] and after [AT (Silence After Sequence) Command] the command characters. The default BT and AT times are 500mS.

The default sequence for entering into AT Command Mode:

The default sequence for entering into AT Command Mode: The default sequence for entering into AT Command Mode:

1. No characters sent for ½ a second.

2. Input three (3) plus characters (“+++”) within ½ of a second.

3. No characters sent for ½ a second.

When the FireLine modem first enters the Command Mode, it sends the phrase “FireLine” out it serial port, and then an “OK” sequence. The “OK” sequence is a sequence of 4 characters:

An “O”, “K”, <CR>, and <LF> characters

(<CR> = ASCII 0D, <LF> = ASCII 0A)

6.3. Setting a Parameter

To set a parameter in the FireLine modem, enter the Command Mode as described above. Then enter the proper AT command, a space, the parameter, and then a carriage return. For Example, to set the address of the FireLine modem to 1234, enter the following command:

ATDT 1234 <CR>.

Once a Parameter is changed, the modem will begin using the new parameter as soon as it exits the Command Mode and returns to its normal operation mode. If the new parameter was saved to non-volatile memory using the ATSV command, then the new parameter will be used as well the next time the FireLine modem is powered on.

If a parameter is changed, but the ATSV command is not issued, the new parameter is used to operate the modem, but when power is turned off and back on, upon powering up, the FireLine will revert back to the previously saved parameter value. If parametric changes are to be permanent, always issue the ATSV command after all parameter changes have been made.

6.4. Reading a Parameter

To read the value of a particular setting, issue the command, with no parameter. The modem will return the value followed by an “OK”. The modem’s OK response is:

The value in ASCII decimal format.

A <CR> <LF> (<CD> = ASCII 0D, <LF> = ASCII 0A).

An “O”, “K”, <CR>, and <LF> sequence.

For example, if the user enters the command to read the FireLine’s modem address and its address was 1234, the user would issue the following command:

ATDT<cr>

and the modem will respond with:

1234 <CR> <LF> OK <CR> <LF>

To get on-line help with a command, enter the command and put a question mark in for the parameter. For example, to see what the ATDT command is for, type ATDT ?. The modem will respond by listing a brief description of the command. To see a list of all commands, type HELP.

6.5. CONFIG Button

If certain parameters within the modem are modified in a manor that causes the modem to cease functioning or if the user cannot enter the command mode via the “+++” method described above, there is a small push button internal to the FireLine modem to assist in this case. This CONFIG button may be pressed at any time, and forces the modem into a known operational state. The CONFIG button is located inside the modem. Remove the rear cover, exposing the two circuit boards. The button is in the center of the lower circuit board as shown below.

The default setting that the modem will revert to when the CONFIG button is pressed are:

1. Serial port 9600 baud, 8 data bits 1 stop, no parity

2. ATCT setting set to 60000 (60 second time-out)

Even though the serial baud rate reverts to 9600 baud when the CONFIG button is pressed, it will revert back to the ATBD setting programmed into the modem once the Command Mode is exited.

6.6. Exiting the Command Mode

There are three ways to exit the command mode. They are:

1. ATSV Issuing the ATSV command saves the current configuration to nonvolatile memory, and then returns to the normal operation mode.

2. ATCN Issuing the ATCN command does not save the current configuration, but it does cause the modem to continue to operate. If changes to the configuration were done in the Command mode, these changes will be used in operation, but they are not be saved to non-volatile memory. The next time the modem is powered down and back up, the modem will operate with the previously saved settings.

3. Time Out. After a pre-set amount of time (60 seconds is the factory default time), the modem will automatically exit the Command Mode, and continue normal operation. Changes will not automatically be saved. This time-out duration may be set with the ATCT command.

6.7. Restoring Factory Defaults

The AT&F command may be used to restore the modem back to the factorydefault condition. Use this command with caution, as it will erase all previously configured parameters. It will cause the modem to revert back to the factory-defaults, as shown in the command table, “Factory Default” column. The only parameters that it does not restore to default are the radio type and radio calibration values R0-R9, and RA. This is so that the user may restore defaults, and not have to re-calibrate the radio.

To erase ALL parameters, including the radio type and radio calibration, issue the AT&F 123 command. There should not be any reason do this command, because it will require the radio to be re-calibrated per the factory alignment procedure.

6.8. Command Mode Commands

Command

Enable/Disable ARQ – When ARQ is enabled, this modem

will automatically send an ACK packet back to a modem that sends it data. 0=off, 1=on.

Command Description Parameters

Range: 0 – 1

Factory

Default

0 (no AKCs

sent)

CN or O

Auto Status Report Interval– Sets the time between auto status reports. Time is in minutes. 0 means disabled.

Silence AFTER Sequence - Sets period of silence after the command sequence characters in mS.

Baud Rate – Sets serial com port baud rate (bps). Over-theair (throughput) baud rate is set with ATR2 command. If a PC’s serial baud rate is set higher than the fixed over-theair baud rate of the module, hardware handshaking may be required.

Busy Channel Lock Out – Enable/disable the BCL. When enabled, the modem will not transmit on a radio channel that is busy (has RF on if). 0-OFF, 1=ON. This feature must remain enabled.

Silence BEFORE Sequence – Sets period of silence before the command sequence character in mS.

Configure Hardware Flow Control – Enable (1) or disable (0) flow control. When enabled, the modem will monitor the RTS line, and if it is negated, stop sending data out the serial port. If disabled, the modem will ignore the state of RTS, and always send out charators.

Exit AT Command Mode – Exits module from AT Command Mode and returns it to Idle Mode. Parameters are not saved in EEPROM. Time Out from AT Command Mode – If no valid commands have been received within this time period (in milliseconds), modem returns to normal operation mode from Command mode. If the CONFIG button inside the FireLine is pressed, this parameter will be automatically set to 60000.

Destination Address to call– Sets address of the modem to send data to. Note, this parameter is entered in HEX format. Each digit may be a 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,or an F.

Range: 0 –56000 (minutes)

Range:0 – 1000 (mS)

Range: 0 – 6 0 = 1200 bps 1 = 2400 2 = 4800 3 = 9600 4 = 19200 5 = 38400 6 = 57600

Range: 0-1

Range: 0-1000 mS

1 = Enable 0 = Disable

none

Range: 100-60000mS

Range: 0-FFFF 1234

0 (Off)

500

none

60000

E0 , E1

Echo – Character echo set on (E1) or off (E0). This applies to the Command Mode only.

Display frequencies – Display all of the frequencies programmed into all of the channel memories.

Channel Number – Select separate channels to minimize interference between multiple sets of modules operating in the same vicinity.

Enable/Disable the LEDs – 0 = LEDs always off. This reduces some power consumption. 1 = LED operate normally.

Company Confidential

Range: 0 , 1 0 (no echo)

Range: 1 - 6

0 or 1

Raveon Technologies Corp.

N/A

Monitor Address – – Configures the address to which status

transmissions are sent to. Only used if Auto Status is enabled. Each digit may be a 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,or F. Note: FF is interpreted as a group. See addressing section. Address Mask – Configures local and global address space. Each digit may be a 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,or F. In most applications, this is kept at FFFF.

Protocol Select – The over-the-air communication protocol. 0=Packetized mode, 2=Streaming data.

Unit Address – Configures the individual; address for this unit. Each digit may be a 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,or F. Note: FF is interpreted as a group. See addressing section.

Parity – Selects parity format. Settings 0-4 transfer 8-bits over antenna port and generate the parity bit on the RF receiving side.

Range: 0000 - FFFF

Range: 0-2

Range: 0000 - FFFF

Range: 0 – 5 0 = none 1 = Odd 2 = Even 3 = Mark (1) 4 = Space (0)

FFFF

1234

NS Stop Bits – Selects the number of stop bits.

Packet Error Display –

error rate. Displays Packets Per Minute (PPM) and a running total.

Symbol Peak Deviation

transmit symbols. Note: This can be a negative number to invert the modulation.

Shows statistics to compute packet-

– Set the peak FM deviation of the

Range: 1-2

None (display PER) 1 = reset counters 2 = Stop PER display

Range: -1000 – 1000

Range : 0 - 2

Select CD pin output signal – CD may be RF carrier detect,

or modem data detect.

2 = Always assert CD 1 = Data CD 0 = RF CD

Range:

0 = 800 4 = 8000 4L 1 = 1200 5 = 9600 2L 2 = 2400 6 = 19200 4L 3 = 4800 7 = 5142 2L 8 = 9600 4L

Range: 1 - 5000

Range: 3 - 255

Range: -500 to +500

Over-The-Air bit rate - This is the data rate the radio uses to send data over the air. All RF modems in the network must use the same over-the-air baud rate. Refer to section 6.9 for information on how to set the OTA baud rate.

Serial Port time out – Number of mS of no activity before

transmitting.

Preamble length – The number of bytes to send over-the-air in the pre-amble.

Frequency Offset.

radio channel.

Used to set the radio on the center of the

R9 Modulation Balance. Range: 0-100

None

120**

20 (mS)

4**

(Varies based

on data rate

and radio

type. 7 typical)

0**

20**

Select RF CD output threshold – This value is the RSSI

threshold where the carrier detect is asserted. Note: To force CD always on, set this to 0, and R1 to RF Carrier Detect.

Number of retries. If this modem does not get an ACK

back when it sends data, this is the number of times it will retransmit the packet and wait for an ACK. 0=disabled feature.

RF Carrier Required – When enabled, there must be RF

energy on the channel for the modem to output data. Streaming data mode only. 1-RF required. 0=ignore rf energy when receiving.

Transmit Time-Out-Timer – Sets the transmitter time-out-

timer in seconds. This is a fail-safe timer for improper configuration or operation of the modem. In normal

Company Confidential

Range : 0-999

300**

Range: 0-99

Range: 0, 1

Range: 0-999 (seconds)

Raveon Technologies Corp.

(ACKs are not

used)

0 (no RF required)

operation, the TOT setting is not changed.

RSSI (Receive Signal Strength Indicator) – Returns the

signal level of last received packet. This is DAC reading of the RSSI in the radio. It is not calibrated, but gives a relative

No parameters. Returns a number 0-1024.

none

signal strength indication.

Serial Number – Reads and returns a unique serial number for thjs unit.

Show – Display the configuration of the modem. This will return a page of ASCII characters, showing the main configuration parameters.

Save – Save all the parameters to EEPROM. This command must be used if changed parameters are to be stored in nonvolatile memory, and used next time the modem is powered up. Modem exits configuration mode after this command is executed. It saves all parameters except the frequency (The frequency is automatically saved when an ATFT, ATFR, or ATFX command is executed)

Transmit Random Data – When issued, the modem will begin sending random data. Entering a <CR> will terminate the transmission.

Max Packet Size – Set the maximum number of bytes in an over-the-air packet.

Read DC input Voltage– Returns the DC input voltage reading, in mV (12500 = 12.5VDC input).

Firmware Version – Returns firmware version currently loaded into the unit.

Restore Factory – Restore the factory default values. This command will not erase the calibration values. After this command executes, the modem will still be in the CONFIG mode.

Read Only

1 - 999999999

0 = Go back to normal 1 = Random 2 = Hop up/dn one channel 3 = Force PLL to fast 4 = TX all 0s 5 = TX all 1s 6 = Test Points ON 7 = Transmit CW 8 = Transmit 1010101…

1 - 512

None

Read Only, 3 characters

none

unique

None

240

none

** indicates values that are calibrated in the factory and are unit-specific. If the “Radio Type” is changed, these will need to be re-calibrated.

Company Confidential

Raveon Technologies Corp.

6.9. Setting the Over-The-Air Data Rate

The SkyLine has programmable over-the-air baud rates. The over-the-air rate is stored in register R2, and is programmed with the ATR2 x command, where x is a number corresponding to the rate. The are 8 possible baud rates, but not all rates may be used with all radio modem models. Consult the following table.

Over-the-air rate Number of Modulation

Levels

4800bps

800bps

1200bps

2400bps

(R2=3)

8000bps

5142bps

9600bps

(R2=0)

(R2=1)

(R2=2)

Default setting

(R2=4)

(R2=7

) 2

(R2=8)

Changing the over-the-air data rate will change the sensitivity of the receiver. Higher-data rates require a stronger signal at the receiver to be properly received. The default over-the-air data rate for FireLine radio modems is 4800 baud for narrow-band versions, and 9600 baud for wide-band versions.

The maximum over-the-air baud-rate for a narrow-band radio (12.5kHz channelspacing) is 9600bps. Due to IF filter limitations, the FireLine does not work as well at 9600 baud as some other rates. Its performance is optimized for 4800 baud 2-level modulation and 8000 baud 4-level modulation.

RV-M5M (narrow-band version)

Factory default, set R2 to 3 (4800 baud).

For high-speed operation, set R2 to 4 (8000 baud).

For best range (longest distance), set R2 to 1 (1200 baud)

Other data rates of 0(800bps), 2(2400bps), 3(4800bps), and 7(9600bps) will work, but have a less optimal bit-error-rate vs. receive sensitivity.

6.10. Debug Related Commands

Bench Testing

(Must be in command mode to test. Enter +++ at the keyboard to put unit into config/test mode.)

ATTD x Various transmit test routines.

0 = Go back to normal mode. Stops the test. 1 = Random data transmit. 2 = Hop up/down one channel 3 = Force PLL to fast lock mode 4 = Transmit all 0s 5 = Transmit all 1s

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6 = Enable the test points on the PCB. 7 = Transmit CW on center of channel 8 = Transmit preamble (101010 pattern)

SHOW Display an overview of the configuration.

ATST Display statistics of how the modem is working.

AT$5 Display RSSI. It will scroll the reading until another character comes in

the serial port.

Packet Counter

The packet counter mode will output packet count statistics once per minute. It will output the number of packets received in the last minute as well as the running total. T

ATPE Begin counting and displaying the packet counters every minute

ATPE 1 Reset the packet counters back to zero

ATPE 2 Stop counting and displaying packet counters

Upon power up, the packet counter feature is always disabled.

Company Confidential

Raveon Technologies Corp.

7. FireLine Diagnostic Provisions

7.1. Overview of Diagnostics

Internal to the FireLine radio modem, is a powerful 32-bit microprocessor. Along with handing all aspects of radio modulation and demodulation, the microprocessor also maintains an extensive array of diagnostic information.

This section details the diagnostic information available, and describes how to us the information to optimize or troubleshoot a FireLine radio network.

7.2. Reading the Diagnostic Information

FireLine diagnostic information is read using AT commands, while the unit is in the Command Mode. Refer to the section “User Serial Port Commands” to learn how to put the FireLine modem into the Command Mode.

To see a general overview of how the modem has been operating, us the ATST command (status request command), without any parameter. The radio modem will respond with a list of certain operation statistics that it maintains. All statistics start counting at 0. The ATST 1 command can be used to reset all statistics back to 0, except the run-time timers.

Other operation and configuration statistics are available using the ATST command, with a parameter to specify the desired statistic. The following table describes the various statistics available.

7.3. Status and Statistics Command

Command

ST1 Reset Statistic Counters – All statistic counters will be reset to 0. OK

ST2

ST3

ST4

ST10

General Communication Statistics – This command will cause the

FireLine to output a table of various operational statistics.

Low-level internal statistics – Returns various low-level statistics. These are subject to change in various firmware revisions.

Compile date and time – Returns the data and the time that the firmware was compiled.

Run Time – Returns the amount of time that the modem has been powered up and running.

Statistic Read – Returns numeric values, comma separated, of all statistics as described in the ST command.

Command Description Response

Statistics overview

screen

Low-level

statistics

screen

Date and time

Run time

display screen

Run time

display screen

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7.4. ATST Command

The ATST command, will return the following information:

STATISTICS Good RX Packets : nnn (packets received over the air with no bit-errors and correct address) With Bad CRCs : nnn (over-the-air packets with bit errors that were discarded) With Bad Noise : nnn (receptions that were aborted due to noise, CW jamming, lost signal…) Bytes received : nnn (number of bytes this modem received, and sent out its serial port) Bytes transmitted: nnn (number of bytes this modem received via the serial port, and

transmitted over the air)

Packets send : nnn (number of packets this modem has transmitted over the air.

Retransmissions in the ARQ mode are not counted)

ACKs received : nnn (Number of ACK packets this modem received, when ARQ was

enabled)

ACKs transmitted : nnn (Number of ACK packets sent over-the-air in the ARQ mode) Pkts last minute : nnn (Number of packets received during the last minute) UART errors : nnn (serial port framing and overrun errors. Usually these are caused by

incorrect serial port settings)

If there is a hardware problem, there may be one ore more hardware error messages listing the error types (CPU Exceptions, OS Rebooted, or Fatal OS failures). Consult the factory if any of these messages ever appear.)

7.5. ATST2 Command

The ATST2 command, will return additional lower-level statistics:

RF FIFO overruns : nnn (number of times the modem was too busy to receive data over-the-air) Wrong address : nnn (packets with addresses intended for some other unit. Also will count

apparent false packets due to random noise)

Duplicate packets: nnn (number of packets discarded because they already were received, and

subsequently re-received due to ARQ mode or a repeater)

Missing ACKs : nnn (number of transmissions in ARQ mode, where this sending FireLine did

not receive an ACK back as it expected to)

TX FIFO overflows: nnn (number of bytes of data that came into the FireLine over-the-air, and

there because there was no buffer space for the data, were discarded. If greater than 0, the serial-port baud-rate should in increased. )

RX FIFO overflows: nnn (number of bytes of data came into the FireLine’s serial port, and there

was no room in the FireLine to buffer the data before transmission, so these bytes were discarded. If greater than 0, flow-control should be enabled, hardware flow-control implemented, or the serial-port baud rate reduced.)

OS loop time : nnn (number of times OS executes, per baud. Typical 10-200. 0 or >5000

means there is a serious OS problem).

OS Speed : nnn (speed of the main Operating System, in Hz. Typical 8000-30000. ) VCO Bias : nnn (the DAC value that biases the VCO in the radio. 0-1024 = 0-3.3V) Config : hhhh (hexadecimal representation of an internal configuration word.)

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7.6. ATST3 Command

The ATST3 command, will return the time and date the firmware in the FireLine was compiled.

7.7. ATST4 Command

The ATST4 command will return internal timers that tell how long the modem has been powered up and running. All of these timers restart a 0 upon power up.

Run time: Years: nnn (number of years running) Days : nnn (number of days running, resets to 0 after one year) Hours: nnn (number of hours running, resets to 0 after 23 hours, 59 minutes, 59 seconds) Min: nnn (number of minutes running, resets to 0 after 59 minutes, 59 seconds) Sec: nnn (number of seconds running, resets to 0 after 59 seconds) Uptime:nnn (number of seconds running. Does not reset.

7.8. AutoStatus

The auto-status feature of the FireLine enables it to automatically transmit a packet of status information. By default, this feature is disabled.

To enable the Auto Status feature, use the in minutes. The interval may be between 1minute an 65000 minutes (45 days).

The general format of the message that the modem will send is:

[an ASCII STX character, 02]

BEGIN STATUS ATMY=

1234 D1

ATVR= ATDT=

1234 12300

ATVB= UPTIME= OSERR= PRX= PTX=

[an ASCII ETX character, 03]

The first character is a Start of Text character. This is followed by the phrase “BEGIN STATUS”. Each line in the status transmission is terminated with an ASCII carriage return (0D) and line feed (0A).

As new features are added to the fireline, there may be new status lines added, but all FireLine modems with Revsion D or higher firmware support at a minimum, the above shown status parameters. The status transmission will end with an ASCII 0 character, the End of Text character.

The parameters passed in the status message are:

120

0 1295 7933

ATAS xxx command, where xxx is the status interval

ATMY The ID of the modem sending the status.

ATVR The firmware version in the modem

ATDT The ID the modem is programmed to send data to.

ATVB DC voltage, in millivolts of the DC input to the modem.

UPTIME Number of seconds since this modem has turned on.

OSERR The number of Operatin System Errors. Normally this is 0.

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PRX The number of packets this modem has received.

PTX The number of packets this modem has transmitted.

The ID code that the status information is sent to, is set with the ATMA xxxx command. Whenever a status transmission is sent, the “TO ID” of the transmission is the address set using the

ATMA command. This allows the system to be configured in a way the normal modem

communications take place between the modems, and the status information only is delivered to modems that need to receive it.

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8. Tune-up and Alignment

Do not key the transmitter for more than 30 seconds

out of every 300 seconds. The transmitter is rated at

10% duty cycle maximum.

Radio calibration and alignment is performed using the ATRx commands. The

FireLine modem has been factory calibrated, in should not require any recalibration when installed, or when changing frequency or channel. Unless the user is trained in radio test and calibration, the values stored in the R registers should not be modified.

Alignment and calibration of the RV-M5-M radio modem must only be performed by qualified radio service personnel.

Improper adjustment of the radio calibration (R0-R9 and RA registers), can result in failure of the radio modem.

Calibration and alignment values are stored internal to the modem in the “R” registers. (R0-R9 and RA). For example, to read R5, issue the ATR8 command without any parameter. To change the setting, issue the ATR8 nn command, where nn is the new value you would like to store.

Once you read a register using an ATRx command, you may modify its value by entering a “U” for up or a “D” for down. U or D will change the value by one. Use this trick carefully, because it modifies the last R register that was read, and it is easy to unintentionally modify the wrong register.

8.1. Periodic Calibration

The only setting that may require adjustment is the center frequency. After years of operation, all crystals will age and change frequency slightly. The ATR8 command is used to adjust the center frequency. Like all narrow-band radios, semi-annual checks and adjustment of frequency is recommended.

8.2. Radio Module Types

The following table lists the parameters in the modem that are calibrated at the factory. Calibration values are stored in registers R0 – R9. The FireLine radio modem has the capability of incorporating a variety of different radios modules. Each different radio model is considered a different “radio type”. The radio type is read and set with the ATRT command.

8.3. Center Frequency

1. Key the transmitter with CW output using this command:

ATTD 7

2. The modem will now put out CW on the center of the channel.

3. Read the frequency offset with the ATR8 command.

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4. Adjust the frequency to the center of the channel with the ATR8

command. You can use the “U” key and the “D” key to change the settings up and down one value in real time.

8.4. TX Deviation

1. Switch to channel 1.

2. Key the transmitter into a 50 ohm load using the ATTD 5 command. The

unit will now transmit, and send a digital 0 continuously. This should be +2.0kHz in frequency for narrow-band radios (12.5kHz spaced channels) and +4.0kHz for wide-band (25kHz channels).

3. Adjust the deviation register setting so that the frequency deviation is correct. The deviation is set with a digital adjustment. Use the ATR0 command to read or set the deviation level.

8.5. TX Modulation Balance

(Note: This step is not performed on radios with Radio Type 5)

1. Set-up a service monitor to monitor the FM deviation of the transmitted signal on an oscilloscope. The frequency response of the demodulated FM signal must be greater than 10Hz to 5kHz without any de-emphasis.

2. Transmit random data with the FireLine, using the ATDT 1 command. This command will cause the FireLine to automatically key up, and send random data for one minute.

3. Verify the DC center of the demodulated data is stable. The random data should be randomly timed 1s and 0s, and have little to no AC component on them. See pictures below for details.

4. If necessary, change the ATR9 setting so that the long data bit have the same amplitude and DC value as the shorter ones.

8.6. RX DC Offset Verification

To verify that the DC center of the received signal is near the nominal value, perform the following steps:

1. Generate a test signal, 1kHz tone, 1.5kHz deviation, on the receive frequency. Connect the signal generator to the antenna input. Set the RF level to -90dBm.

2. Measure the average voltage at TPRX1 on the modem circuit board.

3. The DC voltage should be between 1.0 and 2.0 volts, and the p-p voltage of the sine wave should be greater than 50mV and the DC bias on the signal should be less than 2 volts DC.

4. There is no calibration required in this step, but if the specification is not meet, the “quad” coil in the radio may need adjustment to pull the DC level into spec.

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8.7. RX Carrier Detect

The DCD signal from the modem may be generated by detection of RF, using an internal signal called RSSI (Receive Signal Strength Indication). The RSSI signal is an analog signal representing the strength of the RF carrier. It is compared with a pre-set value, and if it is above this value, Carrier Detect is asserted. The pre-set value may be change with the ATRA command.

When the modem is used in the Streaming Mode (non-packetized operation, you may wish to configure the modem to require RF carrier detect to be active for the modem to receive data. Use the ATRF command to enable/disable this feature.

To set the RF carrier detect level, perform the following steps:

1. Generate a test signal, 1kHz tone, 1.5kHz deviation, on the receive frequency. Connect the signal generator to the antenna input. Turn the RF level off.

2. Watch the RSSI value by issuing the AT$5 command. The current reading will be sent out the serial port.

3. Adjust the RF level to a point where you would like the RSSI to trigger the CD signal. This is factory-set to -110dBm.

4. Send the ATRA nnn command. Set nnn to be equal to the RSSI setting you would like the CD signal to trip at. The BUSY LED will also indicate an RF carrier when the RF carrier is above the threshold set with the ATRA command.

5. Generate an RF signal on-channel with a level of -110dBm. Verify the Power/BUSY LED stays on. If it does not, repeat step 4, adjusting in increments of 10.

8.8. MURS Operation

This product is used on frequencies governed by the FCC rules part 95, Subpart J, (Multiple Use Radio Service operation). The MURS channels are:

1 151.820 MHz 2 151.880 MHz 3 151.940 MHz 4 154.570 MHz 5 154.600 MHz 6 151.820 MHz

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9. SkyLine Compatibility

9.1. General

The FireLine RF modem has built-in compatibility with a radio modem made by Sonik Technologies, Vytek Wireless, and Cal Amp called the SkyLine. In most applications, Raveon’s FireLine modem can communicate with SkyLine modems, provided the FireLine is properly configured. There are two versions of the Skyline, a wide-band version running at 9600 bps over the air, and a narrowband version running at 5142bps over the air.

9.2. Configuring FireLine to Communicate with a SkyLine

To configure the FireLine modem to talk to an old SkyLine modem, the user must configure the FireLine with these commands:

ATR2 7

ATR5 8

MYID 1234

TOID FFFF

This command tells the FireLine modem to operate with an over-theair baud rate of 5124 bits per second. This is the baud-rate of all narrow-band (12.5Khz spaced) SkyLine radio modems. Wide-band SkyLine radios operated at 9600 baud over the air. The command to set the FireLine to 9600 baud over the air is ATR2 5.

This command tells the FireLine modem to send 8 bytes of pre-amble before every transmission.

The MYID of the FireLine modem is set with the ATMY command or the MYID command. The default MYID of the SkyLine was 1234.

The TOID of the FireLine modem is set with the ATDT command or the TOID command. The default TOID of the SkyLine was FFFF (broadcast address).

A quick-configure command is included in the FireLine, to allow it to be easily switch to the FireLine mode. The command is “SKYLINE”. When in the configuration mode, enter SKYLINE, and the modem will reconfigure itself as a narrow-band SkyLine modem, with TOID = FFFF, MYID=1234, 80 byte packets, 20mS serial port time out, channel 1 frequency, over-the-air baud rate 5142.

9.3. Use of the DM3472 Wide-band Module

The FireLine modem may be configured with a DM3472 wide-band radio module to communicate with the Sonik SL-UC wide-band SkyLine radio modem at 9600bps. To do so, the following parameters must be set. All other configurations will stay the same as a standard FireLine.

The FireLine radio modem must he a wideband configuration, with a –S on the end of the part number. (ie RV-M5-UC-S2)

Note: This requires that the radio type be changed to 5, and the peak deviation set to 3.0 kHz.

ATRT 5

Set the radio type to 5. This must be the first parameter that is configured.

SKYLINE Set the SkyLine protocol mode.

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ATR2 5 Set the over-the-air baud rate to 9600 baud.

ATR0 180 Set the peak deviation to +/-3.0kHz. This setting will probably

have to adjusted to achieve the exact deviation.

ATR1 1 Use data CD

ATR5 9 SkyLine wide-band modems required 9 bytes of preamble.

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10. Antenna Information

Key to a successful installation is the choice and installation of a good antenna system. A good quality antenna can more than double the range of a radio system. Properly locating the antenna is vital to creating a quality radio link, and a poor installation can decrease the range of the system by as much at 90%.

Use these guidelines to evaluate your antenna system design, and be sure contact a quality radio communication equipment distributor such as Talley Electronics (http://www.talleycom.com ) to help choose the proper antenna for your system.

Antenna height is limited to 20 feet above a structure or 60 feet above the ground whichever is greater (47 CFR 1315).

MURS radios must not be connected to a “booster” or power amplifier. The rules limit the Transmitter Output Power (TPO) to 2 Watts (47 CFR 95.1311).

MURS radios are prohibited from connecting to the public switched telephone network (47 CFR 95.1313).

To increase your communications range, located the antenna high as needed, practical, safe, and allowed by your license. On fixed base-station applications, you may utilize an antenna with gain. Note: The maximum Permissible Exposure

(MPE) for this product was computed using a 0dB gain antenna, and must be recalculated if a gain antenna is used.

Height

Gain

Try to locate the antenna as high above obstructions, vehicle, and buildings as possible. UHF radio channels require a clear “line-of-sight” between the transmitter and the receiver. Radio waves will penetrate buildings, and reflect off and around obstacles, but the fewer obstacles between stations the better the signal quality.

Antennas are specified by their gain. They actually do not have gain, but rather they can increase the strength of a signal in certain directions, at the expense of attenuating signals from other directions. Gain antennas always have “patterns” of gain. It is important you understand the pattern of your antenna. Omni directional antennas will receive from almost any angle, 360 degrees around them.

Omni Antenna Directional Antenna

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11. Internal Radio Connection

Internal to the FireLine, the modem circuit board interfaces to a radio transceiver module via a 14 pin single in-line connector. The following table describes the function of each pin.

Pin # Function

1 System ground 2 3 4 RX ON. +5.0V in RX mode 0V TX mode. 10mA maximum current

5 Radio ON. +5.0V DC to radio. Digital output. 10mA maximum

6 Transmit modulation. 2.5V DC RX, 2.5V DC with 2V p-p Gaussian

7 Synthesizer lock detect input. Low=unlocked. High = locked. 8 PLL enable signal. Latch enable signal for serial interface to PLL. 9 PLL data signal. Data to PLL chip via three wire interface, pins 8,9,

10 PLL clock for three wire interface. 11 No connect 12 RSSI input from radio. Optional input signal. 13 Receiver discriminator input from radio. On-board AGC for signals

14 Modulation balance output. Adjustable DC voltage, set with the

+7.5V regulated output, ±5%. 1.5amp maximum current source. +7.5V transmit, ±5%. 100mA maximum current source.

source.

current source.

filtered 9600bps data during transmit.

and 10.

with amplitude of .1V-2Vp-p and a DC bias of 1V-2.5V.

ATR9 command.

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12. Appendix A. Serial Port Hardware

12.1. Serial Port Data and Handshaking Signals

In computer terminology, the RF modem is considered a “Data Communications Equipment” device, or DCE. The user’s hardware that the modem is connected to is considered “Data Terminal Equipment”, or DTE.

Following is a description of how data and control is communicated over the various serial port signals between the modem (DCE) and another device (DTE) that the modem’s I/O port is connected to.

TxD (INPUT)

This line is used to transmit data from the DTE to the DCE. It is maintained at a logical 1 state when nothing is transmitted. If Hardware Flow Control is enabled in the modem, the terminal will start to transmit data to the modem when a logical 1 is present on all of the following lines:

•

Clear To Send

•

Request to Send

RxD

(OUTPUT)

This circuit is used to receive data from the DCE to the DTE. The modem will start to transmit data to the DTE when a logical 1 is present on all of the following lines:

(output from modem)

(output from the DTE)

•

Data Terminal Ready

•

Data Set Ready

RTS

(reply that it is OK to send)

(asserted by the modem)

On this line, the DTE will send a signal when it wants to receive data from the FireLine modem. The FireLine modem will not output data unless this pin is low, or “Flow Control” has been disabled in the modem set-up. When a DTE (such as a PC or microcontroller) wants to stop the flow into it, it negates RTS. Negated "Request To Send" (digital 1) means "request NOT to send to me" (stop sending). When the DTE is ready for more bytes it asserts RTS (digital 0) and the flow of bytes to it resumes. DCE equipment works the same way but sends the stop signal out the CTS pin. Thus it's RTS/CTS flow control using 2 lines. The user may turn this feature off or on, using the ATCH command. The default is OFF. To turn it on, issue an ATCH 1 command.

CTS

This signal is an output from the FireLine, and it indicates the FireLine’s ability to send more data. If the user tries to send more data into the FireLine than the FireLine can transmit over the air, it will negate the signal on this pin. The CTS may be asserted when the serial-port data rate is greater to or equal to the overthe-air rate. For example, if the over-the-air data rate is set to 2400 baud, and

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the user is send data into the modem at 9600 baud, the modem will negate the CTS signal once the FireLine’s internal data buffers become full.

On this line the modem indicates to the DTE that it has received a carrier from a remote device. It will assert this signal any time there is a carrier detected. The modem may be configured to assert this when an RF carrier is detected (any onchannel RF, voice or data), assert it only when another RF modem signal is detected, or always assert it. The operation of this line is configured with the ATR1 command. The default is 1 (asserts when FireLine data is detected on the radio receiver).

DTR

This line is an input to the FireLine. It is normally ignored because the default configuration of the FireLine modem is to ignore this signal. If the DTR line is enabled for use, using the ATK5 1 command, the DTR input line can be used to put the FireLine modem into its SLEEP mode. With DTR enabled, anytime the DTR line is a logic 0, the FireLine will be operating normally. With DTR enabled, anytime the DTR line is a logic 1, the FireLine will go into a SLEEP mode, drawing much less DC power.

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12.2.

Null modem without handshaking

Sometimes, a “Null Modem” cable may be required to connect the FireLine modem to another device. The specific connections are very dependent upon the type of hardware and handshaking used, but the following sections should help in configuring a null-modem cable.

How to use the handshaking lines in a null modem configuration? The simplest way is to don't use them at all. In that situation, only the data lines and signal ground are cross connected in the null modem communication cable. All other pins have no connection. An example of such a null modem cable without handshaking can be seen in the figure below.

Simple null modem without handshaking

(DB-9 Female shown. Same wiring for male-to-male cable)

Connector 1 Connector 2 Function

2 3 Rx Tx

3 2 Tx Rx

5 5 Signal ground

12.3.

Compatibility issues

There is a problem, if either of the two devices checks the DSR or CD inputs. These signals normally define the ability of the other side to communicate. As they are not connected, their signal level will never go high. This might cause a problem.

The same holds for the RTS/CTS handshaking sequence. If the software on both sides is well structured, the RTS output is set high and then a waiting cycle is started until a ready signal is received on the CTS line. This causes the software to hang because no physical connection is present to either CTS line to make this possible. The only type of communication which is allowed on such a null modem line is data-only traffic on the cross connected Rx/Tx lines.

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12.4. Null modem with full handshaking

In this null modem cable, seven wires are present. The cable is shown in the following figure.

Null modem with full handshaking

(DB-9 Female shown. Same wiring for male-to-male cable)

Connector 1 Connector 2 Function

2 3 Rx Tx

3 2 Tx Rx

4 6 DTR DSR

5 5 Signal ground

6 4 DSR DTR

7 8 RTS CTS

8 7 CTS RTS

12.5.

Compatibility issues

The null modem cable with full handshaking does not permit the older way of flow control to take place. The main incompatibility is the cross connection of the RTS and CTS pins. Originally, these pins are used for a question/answer type of flow control. When the full handshaking null modem cable is used, there is no request anymore. The lines are purely used for telling the other side if communication is possible.

The main advantage of this cable is, that there are two signaling lines in each direction. Both the RTS and DTR outputs can be used to send flow control information to the other device. This makes it possible to achieve high communication speeds with this type of null modem cable, provided that the system has been designed for it.

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13. Troubleshooting

Symptom: Unit will not receive

Solution #1

blink every time another modem tries to transmit to it. If the RX LED does not blink when it should be receiving, it is on the wrong RF frequency.

Soultion #2.

that the RTS signal is asserted. The FireLine will not output data if the RTS signal on the DB-9 I/O connector is not asserted. If the user’s hardware cannot assert the RTS hardware line, disable hardware flow control in the FireLine modem, using the ATCH 0 command.

Solution #3.

the unit address of the receiving modem. If this is OK, verify that the over-the-air baud rate of all modems is the same (ATR2 command).

Verify that the modem is on the correct RF channel. If it is, the RX LED should

If the addresses match, and RX LED blinks but still no reception of data, verify

If the RX LED blinks, verify that the Unit Address of the sending modem matches

Symptom: Unit will not transmit

Solution #1

will require the CTS signal to be asserted. The FireLine does assert this signal, but if the wire is not connected, you device may not be outputting data to the FireLine. If the TX LED blinks, the FireLine is transmitting data. Every time data enters the modem, the TX LED should blink

Solution #2.

microseconds that the FireLine will look for in the serial input data stream. If a pause greater than this value happens, the modem will transmit. If the ATG0 paramter is set very large, say 2000000, this means 2 seconds, and the modem may simply be waiting a long time

Solution #3.

enables Busy Channel Lockout. If BCL is on, the modem will not transmit on a busy channel. The ATBC 0 command turns it off, and thus the modem will transmit when it needs to, regardless if the channel is busy. The RX led on the front of the modem is illuminated whenever the radio channel is busy (RF present).

Verify that CTS is wired. Some devices that could be connected to the FireLine

Verify that serial port timeout is OK. The ATG0 command sets the number of

Verify that the radio channel is clear or BCL is off. The ATBC 1 command

Symptom: Long delay before transmitting

Solution #1

milliseconds that the FireLine will look for in the serial input data stream. If a pause greater than this value happens, the modem will transmit. If the ATG0 parameter is set very large, say 2000, this means 2 seconds, and the modem may simply be waiting a long time. Typical settings for this parameter are 20 (20mS).

Verify that serial port timeout is OK. The ATR3 command sets the number of

Symptom: Modified parameters are lost at power-up

Solution #1

operate with the new setting, but unless the ATSV command is issued, it will revert to the old setting upon turning power off and back on again. The ATSV command saves all parameters into EEPROM memory, and these saved parameters are restored upon power up.

Issue an ATSV command. After any parameter is modified, the modem will

Symptom: Cannot enter Command Mode

Solution #1

cannot enter the command mode to check it. Try all possible baud rates, and see if one of them works with the modem. Alternately, remove the rear cover of the modem, and press the CONFIG button. This will force the modem into the Command Mode, as well as set the serial port to 9600 baud, 8 data bits, one stop, and no parity. If the baud-rate was OK, verify the AT, BT and CT times, that they are long enough for you to enter the +++ string.

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Verify the serial port baud rate. This is difficult if it is set wrong, because you

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Solution #2.

program, but the hardware or cable may not support it. Disable hardware handshaking on your terminal program to verify this is the issue.

Handshaking. You may have hardware handshaking enabled on your terminal

Symptom: Modem appears dead.

Solution #1

will blink once per second. If it is not blinking, either the modem does not have power, the modem is broken, or the LEDs have been disabled via the ATL0 command.

Verify the power is on. When the modem has good DC power, the PWR LED

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14. Mechanical

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15. Limited One Year Warranty

If within one year from date of purchase, this product fails due to a defect in material or workmanship, Raveon Technologies, Incorporated will repair or replace it, at Raveon’s sole discretion. This warranty is extended to the original consumer purchaser only and is not transferable.

This warranty does not apply to: (a) product damage caused by accident, dropping or abuse in handling, acts of God or any negligent use; (b) units which have been subject to unauthorized repair, opened, taken apart or otherwise modified; (c) units not used in accordance with instructions; (d) damages exceeding the cost of the product; (e) batteries; (f) the finish on any portion of the product, such as surface and/or weathering, as this is considered normal wear and tear; (g) transit damage, initial installation costs, removal costs, or reinstallation costs; (h) damage due to lighting, floods, fire, or earthquakes.

RAVEON TECHNOLOGIES INCORPORATED WILL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR

LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU. THIS WARRANTY IS IN LIEU OF ALL OTHER EXPRESS OR IMPLIED WARRANTIES. ALL IMPLIED WARRANTIES, INCLUDING THE WARRANTY OF MERCHANTABILITY AND THE WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE, ARE HEREBY MODIFIED TO EXIST ONLY AS CONTAINED IN THIS LIMITED WARRANTY, AND SHALL BE OF THE SAME DURATION AS THE WARRANTY PERIOD STATED ABOVE. SOME STATES DO NOT ALLOW LIMITATIONS ON THE DURATION OF AN IMPLIED WARRANTY, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU. This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Warranty service is available by mailing postage prepaid to:

Raveon Technologies Corporation 2780 La Mirada Drive Suite C Vista, CA 92081

To obtain warranty service, include a copy of the original sales receipt or invoice showing the date, location, and price of purchase. Include a written description of the problem with the product, a phone number and name of person who may be contacted regarding the problem, and the address to where the product should be returned.

Products repaired under warranty will typically have their program memories erased and reset to factory default settings.

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Raveon FireLine MURS band, FireLine RF Technical Manual

Specifications and Main Features

Frequently Asked Questions

User Manual