ArWest FH915 Scheda tecnica

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stored, displayed, sold, modified, published, or distributed, or otherwise reproduced without

express written consent from ArWest Communications.

FH915

Features Guide

Version 1.0

Last revised November 12, 2013

www.arwestcom.com

TABLE OF CONTENTS

1. Command mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Info. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3. The default settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.1. boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.2. link. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4. Additional settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5. Using the modem as a repeater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6. Modem protection from interference. Exclusion of unwanted frequencies. . . . . . . . . . . . 10

7. Regional features of the modem FH915 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7.1. Region 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.2. Region 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.3. Region 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7.4. Region 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8. Modem and Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8.1. Estimation of the reception quality “On the Fly” . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8.2. RSSI distribution in frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

8.3. The distribution of noise and interference on frequencies . . . . . . . . . . . . . . . . . . . 13

8.4. Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

8.5. BER measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8.6. Modem features programming in the region 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

9. Test signals forming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3www.arwestcom.com

FH915 FEATURES GUIDE

Please use this Features Guide to get familiar and have a good understanding with yours FH915 OEM

modem (below the Modem).

See FH915 User Manual for full description and service operation details at ArWest website

www.arwestcom.com.

FH915 is a multi functional, compact, reliable Spread Spectrum Radio Transceiver.

The following steps summarize the procedure of FH915 installing:

• The easiest way to access the FH915 OEM board is to use the Evaluation Kit (p / n 99-571010-

01). The FH915 connected directly to Evaluation Kit (p/n 99-571010-01) by its 16-Lead Header

Connector, ECS Corp.

• A standard Null-Modem cable (included in Kit) with DB-9 Female connectors on both ends may

be used to connect PC COM_X port with Serial port on adapter.

Additionally, you may need to install on your computer a software like JNSTerm.exe or Hyper Terminal

and ModemVU – Windows based Unit Configuration and Maintenance Software Application running on

a IBM PC compatible computer.

Connect to FH915 modem at 115200/8/N/1/HW.

1. Connect adapter to the computer’s serial port PC, then power it using Power Supply 9.0 ... 20.0

VDC.

2. A greeting string from serial port appears on the screen of the JNSTerm.exe or Hyper Terminal:

“Javad GNSS. Real Time Firmware Version 3.1.15, Mar 27 2013”

Modem status is defined by configuration file. Modem is in the data mode and ready to receive or

transmit the data. The received data can be obtained through a serial port RS232. Data transfer can also be

served through a serial port RS232. The full description of the commands which control the routing of the

data stream is presented in the user manual.

The built-in user-friendly Command Line Interface (CLI) allows user to perform a full configuration of

the unit and read the statistics and alarm status. It is the most powerful tool to configure the unit. It makes

changes to all possible settings that system will not be able to determine automatically.

1. Command mode

On power-up the radio modem is in data-mode. To switch to command mode send to the port the Escape-

Sequence

+++

. All bytes that come into the port after this command the modem will recognize as a

command sequence.

FH915 Features Guide

Info

Default configuration

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The modem automatically returns to data mode, if the next command won't be sent to the port within 45

seconds. To return to data mode from command mode use command

datamode\n

2. Info

If you give the command

info\n

, the Modem answers:

FH915 Land Mobile Radio, Javad GNSS.

Product ID =41

S/N =BT001

Hardware =2

Firmware =3.1.14

BootLoader =4.03

MstrDev =0

@00

Where:

Product ID =41

– the FH915 board product identification number;

S/N =BT001

- the serial number assigned to the FH915 board at the factory;

Hardware =2

- the revision number of the modem board;

Firmware =3.1.14

- Version of FW FH915 board;

BootLoader =4.03

- Version of the Bootloader;

MstrDev =0

- Code of the device, which uses a modem FH915 board;

- the FH915 is OEM board.

3. The default settings

3.1. Default configuration

Modem status is determined by the configuration file, which stores user's settings. The factory settings

are stored in the default configuration file. At any time you can return the modem to the default

configuration file by sending two commands

Cfg2dflt\n

and

boot\n

It is convenient to start the acquaintance with the modem with the default settings.

The current status of the modem can be called by using commands

state\n

link\n

, and others.

FH915 Features Guide

The default settings

state

5www.arwestcom.com

3.2. state

If you issue the command

state\n

, the modem answers:

Region =1

Tx =915000000

Rx =915000000

T=43.50

@00

Where

Region =1

- the region code; 0 – EUR; 1 – USA; 2 – AUS; 3 – SPC.

Note: The region code specifies the frequency range, the signal structure, so that many modem settings are

related to the choice of the region.

Tx =915000000

- the preset value of the transmitter frequency in Hz.

Rx =915000000

- the preset value of the receiver frequency in Hz.

T=43.50

– Temperature on the FH915 board near the power amplifier.

3.3. link

The Modem settings can be accessed using the

link\n

If you issue the command

link\n

, the Modem answers:

MOD =5

PWRB =15

FHOP =0 0

TRFC =1

SCRAM =1

FEC =1

DCRC =0

DLNG =0

DSRV =0

LBT =1

@00

Programmable parameters and their meaning:

MOD =5

– the modulation type code;

PWRB =15 - programmable output transmitter power;

Parameter

PWRB

can be read by command

link pwrb\n

FH915 Features Guide

The default settings

link

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The set output transmitter power use the command

link pwrb D\n

D =7,8, … ,30

– output power in dBm.

FHOP = 0 0

- selected transmitter and receiver frequency hopping sequences. The first parameter specifies

the frequency sequence selected for the transmitter, the second - for the receiver.

Command to read the parameters –

link fhop\n

Command to set both parameters –

link fhop D\n.

D – 0,1, … ,9

– for Region 1;

D – 10,11, … ,19

– for Region 2.

In the region

the frequency hopping is not used.

Command to set the frequency sequence of the transmitter –

link fhtx D\n

Command to set the frequencies sequence of the receiver –

link fhrx D\n

TRFC = 1 – the mode of the subpackage transmission at two different frequencies with a choice of the

best subpackage at the reception.

The command to read parameter –

trfc\n

The command to set parameter –

trfc D\n

D =0

– subpackets transmitted without repetition.

D =1

– subpackets transmitted at two different frequencies with a choice of the best subpackage at the

reception.

D =2

– subpackets are transmitted only on the even frequencies. Odd frequencies reserved for data

reception.

TRFC =2

- "transparent mode" - in this mode two modems can implement a "full duplex" - duplex

transmission mode in which data transfer can be maintained "simultaneously" with the reception of data.

SCRAM = 1

- data scrambling.

The command to read parameter is

link scram\n

Command to set –

link scram D\n

D = 0

- data without scrambling;

D = 1

- the standard scrambling;

D = 2

- used scrambling, defined by the user.

FEC = 1

- data encoding.

The command to read parameter is link fec\n.

Command to set – link fec D\n.

D = 0 - data is transmitted without encoding;

D = 1 - data is encoded standard convolution code with R = 1/2.

FH915 Features Guide

Additional settings

link

7www.arwestcom.com

DCRC = 1

- manage the output of the received data to the port.

The command to read parameter is dcrc\n.

Command to set –

dcrc D\n

D = 0

- received data are distributed to the port, regardless of the received data CRC.

D = 1

- data are distributed to the port only if the CRC is correct.

DLNG = 1

- used validation the receipted parameter length subpackage data

The command to read parameter is

dlng\n

Command to set –

dlng D\n

D = 0

- validation of the receipted parameter length subpackage data is not used.

D = 1

- validation of the parameter is used.

DSRV = 1

- a number of receiver parameters passed to the receiver through the channel.

The command to read parameter is

dsrv\n

Command to set –

dsrv D\n

D = 0 -

the receiver's parameters are set from the configuration file.

D = 1

- a number of the receiver parameters are set from service data passed to the receiver through the

channel.

LBT = 1

- Listen Before Talk. The channel occupancy is verified before subpackage transmitting. If the

channel was occupied at the previous slot, the current slot is not used for data transmission.

The command to read parameter is

lbt\n

Command to set –

lbt D\n

D = 0

- Listen Before Talk mode is turned off.

D = 1

- Listen Before Talk mode is enabled.

To save the settings in the configuration file, you must issue the command

save\n

4. Additional settings

Parameter PMP - provides the addressed data transfer as well as the ability to transfer commands. If

parameter PMP is not zero, then its value is displayed in the response to the command

link\n

For example, the response to the command

link\n

when

PMP =3

MOD =5

PWRB =15

FHOP =0 0

TRFC =1

PMP =3, 44 123 091 123

FH915 Features Guide

Additional settings

link

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SCRAM =1

FEC =1

DCRC =0

DLNG =0

DSRV =0

LBT =1

@00

The first parameter in the string

PMP =3, 44 123 091 123

represent РМР value.

The command to read parameter PMP is

link pmp\n

Command to set – link pmp D\n.

PMP = 0

– Any transmits, any receives. At the receiver side neither the source nor the recipient is

validated.

When

PMP> 0

received data contain proprietary service information:

WHT

- a type of data;

DST

- code of the recipient;

SRC

- the data source code. By defaults

SRC

coincides with the last three symbols of the transmitter

, but

can be reprogrammed.

The configuration file contains the parameter

KNW

- the code of the certified data source;

PMP = 1 –

Any transmits to me only. The receiver compares the received code

DST

with its code

SRC

. If the

received code

DST

coincides with the code

SRC

of the receiver, the received data are distributed to the port.

If the received code

DST

is not coincide with the code

SRC

of the receiver, the received data to the port are

not provided.

PMP = 2

– Certified Base transmit to any. The receiver compares the received code SRC and code KNW. If

the received code SRC coincides with the code KNW, stored in the configuration file of the receiver, the

received data are distributed to the port.

If the received code SRC is not coincide with the code KNW, then the received data to the port are not

provided.

RMR = 3

– Certified Base transmit to me only. The receiver compares the received codes: code

DST

with its

code

SRC

and the code

SRC

with the code

KNW

If these codes match the received data are distributed to the port.

Other parameters of the string –

PMP =3, 44 123 091 123

- deciphered as follows:

PMP = 3, WHT DST SRC KNW

WHT

– type of data: WHT =44 (D) – data; WHT =43 (C) – command.

If the modem transmits data (with PMP> 0) it indicates that its (091) data (44) are designated to

modem which code S

RC =123.

If the modem receives data (with

PMP = 3

) it compares own code

SRC =091

with code

DST

in the received

signal, checks that the code SRC specified in the received signal matches the

KNW =123

stored in the

configuration file. If both codes match the received data (

)are distributed to the port.

FH915 Features Guide

Using the modem as a repeater

link

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If these data are the command (

)then the command is executed.

It should be noted that the command is executed only if the

CRC =OK,

whatever you selected

DCRC =1

in the

configuration file or not.

5. Using the modem as a repeater

Parameter

REP

allows using the modem as a data repeater. Retransmission of the data requires the time,

because the transmitting modem uses a transfer mode only on even-numbered slots (

TRFC = 2

). The

receiving modem operating as a repeater (

REP = 1

), must also be set

TRFC = 2

If parameter

REP

is not zero, then its value is displayed in a

link\n

response.

For example, below you can see the response to the command l

ink\n

for R

EP = 1: (TRFC =2

is set

before).

MOD =5

PWRB =15

FHOP =0 0a

TRFC =2

REP =1

SCRAM =1

FEC =1

DCRC =0

DLNG =0

DSRV =0

LBT =1

@00

The command to read parameter

REP

link rep\n

Command to set –

link rep D\n

D = 1

- modem retransmits the received data.

While data transmitter (Base) uses only the even slots (even-numbered frequencies), the repeater must

use the odd slots (odd-numbered frequencies), i.e. use the frequency sequence with single offset -

sequence in which all frequencies shifted by one position in a circle.

Example:

All Rovers receive data at the frequency sequence FHRX =0.The Repeater transmit data at the

frequency sequence FHTX =0.

The repeater receives the data from the Base at the frequency sequence with “single offset”

FHRX =0a. The Base transmits data to the repeater using the frequency sequence with “single

offset” FHRX =0a.

Base not produces an interference for Rovers, since the Base transmits data using FHRX =0a,

but Rovers receive at FHRX =0.

Command to set the frequency sequence with single offset for the transmitter is

link fhtx Da\n

FH915 Features Guide

Modem protection from interference. Exclusion of unwanted frequencies

link

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Command to set the frequency sequence with single offset for the receiver is l

ink fhrx Da\n

6. Modem protection from interference. Exclusion of

unwanted frequencies

If interference contains a big power at some frequency such frequency can be excluded from the use.

To eliminate unwanted frequency, for example, 908400000 Hz it must be added to the list of unwanted

frequencies and stored in the configuration file. To do that use the command

nadd 908400000\n.

After this

command modem answers:

1F 908400000

@00

where 1F - number of frequency in the sequence FHRX.

To exclude other unwanted frequency, for example,

925000000 Hz

add it to the list by command

nadd

925000000\n

. The modem responds:

72 925000000

@00

To view a saved list of unwanted frequencies use the command

nlst\n

. The modem responds:

1F 908400000

72 925000000

@00

To store the unwanted frequencies in the configuration file you would issue the command

save\n

Lists of unwanted frequencies should be the same at the transmitting and receiving sides.

When you have a list of unwanted frequencies the selected frequency sequence is modified so that the

frequencies specified in the list are not used for the transmission or for the reception.

Saved list of unwanted frequencies is applied when the modem have Reset or Power on or when issued

the command

napl\n

This feature allowed excluding those frequencies with interference.

To remove some frequency from the list of unwanted frequencies use the command, for example, n

del

1F\n

. This command removes from the list 1F frequency

908400000 Hz

7. Regional features of the modem FH915

Region code can be read by command

rgn\n

Region code is changed by command

rgn D\n

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