AOR ARD9900 User manual

®
ARD9900
FAST RADIO MODEM
Multi-Mode and Digital Voice Interface
Operating manual
AOR, LTD.

1
Thank you for purchasing the AOR ARD9900 Multimo e an Digital Voice Interface.
The ARD9900 is esigne to convert your HF ra io equipment to a multi mo e an igital voice
capable ra io without performing any mo ifications to your transceiver.
Please rea through this instruction manual an familiarize yourself with the operation of the
ARD9900.
We suggest you keep this instruction manual for future reference.
We believe the ARD9900 will become a powerful tool to your communication capabilities.
AOR, LTD.

2
Features
 Digital voice communications using existing analog 2 way radios with encryption.
The ARD9900 uses the same au io frequencies (300 Hz ~ 2500 Hz) as microphone
au io to mo ulate the voice signal. This allows you to use an analog ra io as a igital
voice transceiver.
 Digital voice communications in the Single Side Band (SSB) mode.
The automatic frequency clarifier function a justs frequency rift automatically in the
SSB mo e. (Approximately up to +/- 125 Hz).
 Utilizes the ODF ( ulti Carrier odulation) circuit that is effective against ulti-path or
Selective Fading.
 Automatic digital receive
Automatic voice signal etector recognizes the receive signal as analog or igital,
automatically switching to the appropriate mo e.
 Digital Slow Scan TV (SSTV)
 Built-in video-capture function (NTSC or PAL depending on version)
Compresses the signal into our original a aptive JPEG format. Sen an receive
images in the Digital mo e. Built-in vi eo output connector allows viewing the picture on
an external monitor.
 Built–in high grade Vocoder (A BE)
Utilizing high gra e igital voice compression; elivers quality igital voice
communications.
 Built-in FEC error correction
A powerful error correction circuit elivers stable an reliable communications.
 Data communications on the HF band
Data communication is possible on the HF (High frequency) ban s at no extra cost.
(Spee may be limite by regulations in certain juris ictions.)
 Small and compact unit. Easy to operate.
Simply connect the ARD9900 to the microphone jack an the speaker out jack. No
complicate or risky ra io mo ifications are necessary.
 Utilizes a uniquely designed high performance DSP (Digital Signal Processor) engine
 Battery operation for field use.

3
Information to the Digital Device user
This equipment uses an can generate ra io frequency energy an , if not installe an
use in accor ance with the instructions, may cause harmful interference to ra io
communications. However, there is no guarantee that the interference will not occur in a
particular installation. If this equipment oes cause harmful interference to ra io or
television reception, which can be etermine by turning the equipment off an on, the
user is encourage to try to correct the interference by one or more of the following
measures:
 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment an receiver.
 Connect the equipment to an outlet on a circuit ifferent from that to which the
receiver is connecte .
 Consult the ealer for technical assistance.
Precautions
To prevent fire, personal injury, or unit amage, please observe the following precautions:
 Do not attempt to a just this unit unless instructe to o so by this manual.
 Do not expose the unit to irect sunlight or place the unit close to heating
appliances.
 Do not place the unit in excessively usty, humi , wet areas.
We are not responsible for any amages to the ra io equipment ue to improper settings
or interface.
We are not responsible for any loss of communications ue to an unexpecte change of
propagation or operating environment.

4
Table of Contents
Page
Supplie Accessories ------------------------------------------------------------------------------------ 5
Controls an functions ---------------------------------------------------------------------------------- 5
Front Panel -------------------------------------------------------------------------------------------- 5
Rear Panel -------------------------------------------------------------------------------------------- 8
Top Panel ----------------------------------------------------------------------------------------------10
Internal View ------------------------------------------------------------------------------------------10
Bottom View -------------------------------------------------------------------------------------------11
Interfacing the ARD9900 -------------------------------------------------------------------------------12
Connection to a Ra io ----------------------------------------------------------------------------- 12
Connection to a Microphone --------------------------------------------------------------------12
Connection to a PC ------------------------------------------------------------------------------- 13
Connection to a Power supply ------------------------------------------------------------------ 13
Connection to an External speaker ------------------------------------------------------------ 13
Level A justment ----------------------------------------------------------------------------------------14
Microphone level ------------------------------------------------------------------------------------14
Ra io Input level -------------------------------------------------------------------------------- 14
Co e Setting ---------------------------------------------------------------------------------------------- 15
Master Key Co e Setting -------------------------------------------------------------------------15
User ID Co e Setting ------------------------------------------------------------------------------15
Air Key Co e Setting ------------------------------------------------------------------------------16
Channel Switch Setting ---------------------------------------------------------------------------16
Operations ------------------------------------------------------------------------------------------------18
Voice Communication -----------------------------------------------------------------------------18
Digital Voice Communication ----------------------------------------------------------------18
Analog Voice Communication ---------------------------------------------------------------18
Force Receive -----------------------------------------------------------------------------------18
Data Communication ----------------------------------------------------------------------------- 18
Receive -------------------------------------------------------------------------------------------19
Transmit ------------------------------------------------------------------------------------------ 19
Digital Image Communication ------------------------------------------------------------------- 19
Receive -------------------------------------------------------------------------------------------19
Transmit ------------------------------------------------------------------------------------------20
Specifications --------------------------------------------------------------------------------------------21
Type of Communications an their respective features --------------------------------------22
Communication Selection Gui ance --------------------------------------------------------------23
Communication Mo e Setting -----------------------------------------------------------------------24
Detaile functions of communication mo e ------------------------------------------------------25
Control Comman s -------------------------------------------------------------------------------------28
Interfacing to a PC -----------------------------------------------------------------------------28
Terminal Settings -------------------------------------------------------------------------------28
Comman format -------------------------------------------------------------------------------29
Entering the System Management Screen ----------------------------------------------29
Operator’s Comman List --------------------------------------------------------------------30
Operator’s Comman Details-----------------------------------------------------------------31
Comman List for the System Manager --------------------------------------------------33
Comman Details of the System Manager ----------------------------------------------34

5
Supplied Accessories
The following items are provi e in the box:
Accessory Quantity
----------------------------------------------------------------
Microphone 1
PC interface cable 1
Speaker Cable 1
DC Power cable 1
Microphone Connector 1
Instruction manual 1
Controls and functions
Front Panel
a. Power on/off switch
b. TX switch
There are two (2) functions with this switch.
1. Digital Image Communication mo e
Set the mo e switch to [10101] ( igital mo e). Press this switch to capture
an sen an image.
Note: When the Video Through Function is activated (AVT command is ON),
pressing this switch will enable output of the video signal connected to the Video
Input to also be sent to the video output port, so that you can monitor the
transmitted video image.
Press this switch again to capture and send the image through the radio
equipment. When the Video Through Function is de-activated (AVT command is
OFF), pressing this switch will automatically capture the video image and then
transmit it through the radio equipment.
(Refer to: Operation -- Digital Image Communication at page 18 for details.)
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9

6
2. Digital Voice Communication mo e (non encryption or fixe scramble co e
mo e)
Set the mo e switch to [~] (analog mo e). Press an hol this switch to
force the ARD9900 to eco e igital voice signals.
Caution: Frequency tolerance for both parties must be in the range of +/-125 Hz.
(Refer to: Operations -- Digital Voice Communication force receive at page 17
for details.)
c. BUS LED (Busy LED)
Stea y re
The unit is in the transmit mo e
Flashing re
Flashes re while the hea er information is being sent, when in the igital
communication mo e. (Approximately one secon ).
Green
The unit is in the receive mo e
Not lit
The unit is in the stan by receive mo e or in the analog voice receive
mo e.
. STA LED (Status LED)
In the ata communication mo e, lit while unsent ata is in the memory. It
isplays orange when the Vi eo Through Function is activate (Digital
Image Communication mo e). When the Vi eo Through Function is e-
activate (AVT comman is OFF), this LED will not be lit.
e. Speaker volume a justment
A justment for the internal speaker output level (or the external speaker
output level when it is connecte .)
f. MODE LED (Operation Mo e LED)
In icates the current operation mo e:
Lit in green ----- Digital Voice mo e
Lit in re ----- Analog Voice mo e
Lit in orange ----- Data Communication mo e
Not lit ----- Digital Image Communication mo e
g. CHANNEL switch
Select preloa e encryption co e.
(Refer to: Channel Switch Setting at page 15 for details.)
h. Overloa in icator
Lit when the microphone input is overloa e (too high).
A proper microphone input level will cause the LED to flash from time to
time when speaking into the microphone at a normal level.
The microphone level can be a juste with the microphone level controller.
(Refer to: Level Adjustment at page 13 for details.)

7
i. Mo e switch
Select the Digital voice mo e [10101] or the Analog voice mo e [~].
When the Analog voice mo e [~] is selecte , or inary analog voice
communications will be ma e. In the receive mo e, however, the ARD9900
will automatically etect the mo e of the incoming signal an eco e signals
accor ingly. The LED in icates the respective operation mo e.
j. Microphone connector
Connect the supplie microphone to this connector.
Below are the pin assignments of the connector.
1. Speaker output -- Monitor output signal is present at this pin.
2. BIAS -- Power source for an electret con enser type of
microphone. 5V DC through 2.2KΩ resistor.
3. GND -- Chassis groun
4. TX -- Groun ing this pin will enable the transmit
mo e.
(Same operation as the TX switch on the front
panel.)
5. D/A -- Groun ing this pin will force the unit to the
igital voice communication mo e. When this pin is
left open, the operation mo e will be set by the mo e
switch on the front panel.
6. MIC PTT -- PTT (Push To Talk) input.
7. MIC GND -- Microphone groun signal
8. MIC IN -- Microphone signal input
Rear Panel
k. Communication Connector (mini DIN 8 pin) for PC (RS-232C)
Pin Number Signal Signal Direction
1 TX ARD9900  PC
2 DTR ARD9900  PC
3 DSR ARD9900  PC
4 GND GND
5 RX ARD9900  PC
6 RTS ARD9900  PC
7 CTS ARD9900  PC
8 NC No Connection
Shell FG Frame groun
SP
DC IN
AOR,LTD.
+-
OUT
IN
RADIO
IN OUT
VIDEO
klm n op q r

8
Bau Rate: 9600
Data bit: 8
Start bit: 1
Stop bit: 1
Parity: None
Synchronization: Asynchronous
Flow control: Har ware
l. VIDEO - IN connector (75Ω) (RCA type connector)
Connect a vi eo signal source such as a igital camera.
m. VIDEO – OUT connector (75Ω) (RCA type connector)
Connect a vi eo monitor to this connector to monitor a receive image or a
picture to be sent.
n. RADIO Connector
Using the supplie 8 pin connector, connect the ARD9900 to your ra io equipment.
You will nee to wire a cable accor ing to the microphone connector specifications
of your ra io.
Below are the pin assignments of the connector on the ARD9900.
Pin number Signal Details
1 MIC GND Microphone groun
2 MIC OUT Microphone Output
3 PTT PTT (Push To Talk) output
4 GND PTT groun
5 NC No connection
6 NC No connection
7 GND Groun
8 NC No connection
(Caution: IC GND and GND must not be connected together in the ARD9900
connector, or RF feedback will result.
o. SP IN Connector (3.5 mm mono jack)
Connect to the ra io equipment’s external speaker jack.
(Input level: 0.5 V – 5 V p-p)
p. SP OUT Connector (3.5 mm mono jack)
Connect an external speaker to this jack to isable internal speaker.
q. DC IN Connector (EIAJ Type 4)
Connect to a regulate power supply. (10.7 ~ 16.0 V DC, Center pin – positive)
For lower voltage battery operation, set the internal jumper terminal for battery
operation, an then connect external batteries .

9
(Caution: If you have changed the internal jumper for low-voltage battery operation,
battery voltage must be within the range of 5.6 ~6.5 VDC.
DO NOT apply 12.0V or severe damage will result, and the warranty will be
void!)
Note: No low battery voltage detector is built-in the ARD9900.
r. FG
Frame groun
Top Panel
Internal Speaker
Internal View
(PCB design subject
to changes.)
t. Factory setting jumper
Must be set between 2-3. (Do not change this setting at any time.)
v. Battery operation selector
Place the jumper between 1 – 2 (NOR) for normal operation.
Change it between 2-3 (BATT) for battery operation.
If you have change the internal jumper for low-voltage battery operation,
battery voltage must be within the range of 5.6 ~6.5 VDC.
DO NOT apply 12.0V or severe damage will result, and the warranty will e
void!
(Note: No low battery voltage detector is built-in the ARD9900.)
s

10
w. Internal speaker setting
Jumper setting
1 – 2 Activates internal speaker ( efault)
2 – 3 Disable internal speaker
Speaker output is also available from the pin #1 of the
microphone connector.
(Note: The SP OUT (external speaker output) has priority regardless
of the above jumper setting.)
x. Output level setting
Jumper setting
1 – 2 Normal level ( efault) (LOW)
2 – 3 High level (HIGH)
In case the microphone output level is too low to rive your ra io equipment,
place the jumper to the 2-3 position.
(Refer to: icrophone Level Adjustment at page 13 for details.)
Bottom View
y. Microphone output (Ra io Input) level
(Refer to: Setting - Level Adjustment for Radio Input at 19 for details.)
y

11
Interfacing the ARD9900
Connection to a Radio
Before using your ARD9900, you will first nee to wire the cable between your ra io
equipment an the ARD9900.
For your convenience, an 8-pin of a microphone connector for the ARD9900 is inclu e .
You will nee to prepare, however, your own microphone connector for your ra io
equipment.
Below are the pin assignments of the 8-pin RADIO connector on the rear panel of the
ARD9900.
Pin number Signal Details
1 MIC GND Microphone groun
2 MIC OUT Microphone output
3 PTT (H) PTT (Push To Talk) output
4 PTT (L) PTT (Push To Talk) groun
5 NC No connection
6 NC No connection
7 GND Groun
8 NC No connection
・SP IN Connector
・RADIO Connector
1 MIC GND
2 MIC OUT
3 PTT(H)
4 PTT(L)
5 NC
6 NC
7 GND
8 NC
Signal
GND
RADIO EQUIPMENT
MIC GND
MIC IN
PTT IN
PTT GND
GND
EXTERNAL SPEAKER OUT
GND
ARD9900
Shell
Shell
(Note: IC GND and GND must not be connected together in the ARD9900 connector,
or RF feedback will result.)
Connection to a Microphone
A speaker microphone is inclu e with your ARD9900. However, if you wish to use
your own microphone with the ARD9900, you may o so by wiring your microphone to
correlate with the input jack of the ARD9900. Below are the pin assignments of the
Microphone connector of the ARD9900.
1. Speaker output
Monitor output signal is present at this pin when the internal speaker
Jumper is set to 2 – 3.
2. BIAS
Power source for an electric con enser type of microphone. 5V DC
through 2.2KΩ resistor.
3. GND
Chassis groun

12
4. TX
Taking this pin to the groun will enable to transmit.
(Same operation as the TX switch on the front panel.)
5. D/A
Taking this pin to the groun will force the ARD9900 to the Digital voice
communication mo e. When this pin is left open, the operation mo e will
be set by the mo e switch on the front panel.
6. PTT
PTT (Push To Talk) input.
7. MIC GND
Microphone groun signal
8. MIC IN
Microphone signal input
Connection to a PC
A PC interface cable is inclu e with the ARD9900.
Parameter settings can be ma e by using terminal software.
(Refer to: Control Commands at page 27 for details.)
Connection to a Power Supply
To operate your ARD9900, use a regulate power supply.
The operating voltage must be in the range of 10.7 ~ 16.0 V DC (approximately
200mA).
A DC power cable is also inclu e with the ARD9900.
Color Polarity
========================
RED Positive (+)
BLACK Negative ( - )
If you have change the internal jumper for low-voltage battery operation, supplie
voltage must be in the range of 5.6 ~ 6.5 VDC.
DO NOT apply 12.0 V or severe damage will result, and the warranty will e void!
(Note: There is no low battery voltage detector built-in to the ARD9900.)
Connection to an External Speaker
If an external speaker is esire , connect it to the SP OUT jack. This will also isable
the internal speaker.

13
Level Adjustment
Microphone Level
The microphone level has been properly a juste at the factory with the provi e
microphone. Therefore, no further a justment is nee e for normal operation.
If you wish to use your own microphone rather than the inclu e one, you will nee to
wire your microphone connector to match the pins of the ARD9900, an then a just the
microphone level as escribe in the following steps:
1. Power off the ARD9900.
2. Connect your microphone to the Microphone connector of the ARD9900.
3. Set the mo e switch to [10101] ( igital mo e.)
4. Set the CHANNEL selector to [0].
5. Press an hol the TX switch, an power on the ARD9900. The STA LED starts
blinking in icating the ARD9900 is in the microphone level a justment mo e.
6. While hol ing the PTT switch of the microphone, speak into microphone normally.
7. Slowly turn the [CHANNEL] selector clockwise until the overloa in icator flashes
occasionally, with the peaks of your voice signal.
8. Press the TX switch to set the igital voice level.
9. Release the PTT switch an set the mo e switch to [~] (analog mo e).
10. While hol ing the PTT switch of the microphone, speak into microphone normally.
11. While monitoring your analog voice signal with a receiver, slowly turn the
[CHANNEL] selector clockwise until the same amount of voice level as in the
igitali mo e is obtaine .
12. Press the TX switch to set the analog voice level.
13. Power off the ARD9900 to complete the microphone level setting process.
Radio Input Level
Perform the following steps to a just the ra io input level of your ra io equipment:
1. Connect the microphone to the ARD9900, an then connect the ARD9900 to your
ra io equipment. Finally, Connect the ARD9900 to a power supply.
2. Turn the output level a justment on the bottom of the ARD9900 fully
counterclockwise.
3. Turn the power on to the ARD9900.
4. Turn the power on to your ra io equipment.
5. Set the mo e switch to [10101] ( igital mo e.)
6. Press the [PTT] switch of the microphone to transmit from the ra io equipment.
7. A just the microphone gain of the ra io equipment until the ALC function just
activates.
8. If the microphone gain is too low, rea just the output level on the bottom of the
ARD9900.
9. In case the microphone gain is still too low after a justment, turn off the ARD9900.
Remove the top cover of the ARD9900, an set the output level setting jumper to
[2-3] (high level).

14
Code Settting
Master Key code setting
A master key co e is a passwor to allow the authorize operator access to System
Management for maintenance. For your security, our factory efault setting co e MUST
be change with your own co e prior to operation.
To change the Master Key co e, type the [AMS] comman using a PC.
CMD>AMA_123456789012 [CR] ( Enter the factory efault co e.)
( _ : space key)
CMD>AMA OK (Response from PC)
CMD>AMS_ ************ [CR] (Enter a new master key co e.)
[Note: The master key code consists of 12 digits of numeric code (0 ~ 9)]
[Refer to: Control commansd at page 27 for details.]
[Warning ! ]
The master key co e MUST be kept in a secure place. Without a master key
co e, no co e changes can be ma e.
If you ma e an entry error uring an initial setting, correct it un er the above
entry screen. Once you exit from the master key co e setting screen with a
wrong co e, neither you nor our factory can change it!
User ID code Setting
The User ID co e is a unique co e for in ivi ual ARD9900 units.
To change the ID co e, first type the [AMA] comman to allow the user to go into the
Data management Menu.
CMD>AMA_ ************ [CR] ( Enter the master key co e.)
CMD>AMA OK (Response from PC)
CMD>AUI_ ***** [CR] (Enter a new user ID co e.)
[Note: The user ID code consists of 5 digits of numeric code (0 ~ 9)]
Default: 77777
[Refer to: Control commands at page 27 for details.]

15
Air Key code Setting
The Air Key co e is a string of encrption co e information that is attache to the front
of the transmitte ata packet.
To set the Air Key co e, first type the [AMA] comman to allow the user into the
Data management Menu.
CMD>AMA_ ************ [CR] ( Enter the master key co e.)
CMD>AMA OK (Response from PC)
CMD>AAK_ **** [CR] (Enter a new Air Key co e.)
[Note: The Air Key code consists of 4 digits of numeric code (0 ~ 9)]
Default: 0000
[Refer to: Control command at page 27 for details.]
Channel Switch Setting
There are 16 ifferent channel settings for the ARD9900. By simply rotating the
channel switch on the front panel of the ARD9900 to the esire setting, a pre-
programme encryption mo e can be easily recalle from the memory.
To set the Channel Switch setting, first type the [AMA] comman to allow the user into
the Data management Menu.
Rotate an select the esire channel switch position. (0 ~ F)
CMD> (Stan by for comman )
CMD>AMA_ # # # # # # # # # # # # [CR] (Enter the master key co e.)
CMD>AMA OK (Response)
CMD>ACP_ **** [CR] (Enter a new Air Key co e.)
[Note: The Air Key code consists of 4 digits of numeric code (0 ~ 9)]
Default: 0000
[Refer to: Control commands at page 27 for details.]
CMD>ACP [CR] (Display current channel)
CH: $ _ ID: %%%%% _ NM: &&&&& _ MD: $
(Setting for the current channel ata)
CMD> (Stan by for comman )
CMD>ACP _ ! ! ! ! ! _ @@@@@ _ XX ZZ (Set current channel ata)
CH: $ _ ! ! ! ! ! _ NM: @@@@@ _ MD: $ (Response)
[Note: [$] , [%], [&], [ ! ], [@] , [X], [Z] - - - Parameters]
# Master co e (12 igits of numeric co e)
Default: 123456789012
CR Carriage Return (Press the Enter key of the PC keyboar )
$ Channel number (Selecte by the front channel switch)
_ Space (Press the space key of the PC keyboar )
%%%%% Other party’s ID (Other party’s ID)

16
&&&&& Netmask (Current netmask)
F: Netmask vali
0: Netmask invali
$ Communication mo e
(Displays the communication mo e on the channel)
0: Non encryption mo e
1: Digital squelch mo e
2: Fixe encryption mo e
3: Ran om encryption mo e
! ! ! ! ! Other party’s ID (Set other party’s ID)
I D: 00000 ~ 99999
@@@@@ Netmask (Set netmask vali / invali )
Enter “1” or “0” to each igit.
1: Netmask vali
0: Netmask invali
[Note: On the PC screen, “1” will be displayed as “F.”
X X Setting mo e 80: Non encryption mo e
00: Fixe encryption mo e
40: Fixe airkey ran om encryption mo e
50: Ran om encryption mo e
Z Z Algorithm Set communication algorithm
[Note: When the communication mode is set to Non Encryption mode
(80), then the algorithm must be set to either [ 0 0 ] or [ 01] .
00: Non encryption mo e ( efault)
01: Digital squelch mo e
[Note: When the communication mode is set to Fixed Encryption
mode (00) or Random Encrption mode (40, 50), then the
algorithm must be set as follows:
00 ~ 79: Fixe Scramble Co e
80 ~ 99: Variable Scramble Co e (every 20 mS)
[Note: When you execute the ACP command, it will not display detailed communications settings or
algorithm values. If you wish to adjust detailed settings, use the ADS command in the
system management mode.

17
Operations
[ Note: All adjustments must be properly performed before operation.]
Voice Communication
Your ARD9900 is capable of Digital or Analog Voice Communications. In the receive
mo e, the ARD9900 will automatically recognize the type of communication, an set
itself to the appropriate mo e. In the transmit mo e, the esirere operating mo e can
be selecte by using the front panel Mo e switch.
Digital Voice Communication
Set the mo e switch [10101 ~ ] upwar to the igital mo e position [10101].
Rotate the Channel switch on the front panel to select the esire communication co e
setting. Press an hol the PTT switch on the microphone. The STA (Status) LED will
flash for about 0ne (1) secon while sen ing a ata hea er signal. When the LED stops
flashing, speak into the microphone normally.
Analog Voice Communication
Set the mo e switch [10101 ~ ] ownwar to the analog mo e position [~] .
Press an hol the PTT switch on the microphone, an speak into the microphone
normally.
[ Note: The front Channel switch setting will be ignored in the Analog Voice Communication
mode.]
Force Receive
While in the Non Encription mo e (80) or Fixe co e encryption mo e (00) an a
Hea er signal is not properly receive uring communication, you can “force” the
ARD9900 to receive in the igital voice un er following con itions:
 The communication mo e is in the Non Encrption mo e (80) or the Fixe
Encrption mo e (00).
 The frequency ifference between both parties is within +/- 125 Hz.
 Both parties must have the same communication settings.
[Proce ures]
1. Set the mo e switch [10101 ~ ] upwar to the analog mo e position [ ~ ].
2. Press an hol the TX switch for about 5 ~ 10 secon s until an au io
signal is hear from the speaker.
3. Once an au io signal is obtaine , release the TX switch.
Data Communication
Run a terminal software program to control the ARD9900, an enter control comman s.
[Refer to: Control Commands at page 27 for details.]
Two ifferent types of ata, ASCII or binary ata, can be use .
Both ata types can be mixe as communication ata.

18
Receive
Enter the comman [ACO] to go into the converse mo e. The receive vali ata will
be eco e an isplaye on the PC screen. If receive ata is missing, (which may
occur uring poor propagation con itions) “garbage” ata may be isplaye on the PC
screen.
Transmit
Enter the comman [ACO] to enter the converse mo e.
Type text from the keyboar , when you have finishe , hit the enter key.
NNNNNNNN [CR]
NNNNNNNN: ASCII character
[CR] : Carriage Return
[ Note: aximum data length is 2046 bytes per packet.]
To sen binary ata, a [FE] (hexa ecimal) to a hea er an footer with the ata.
FE BBBBBBBBBBBBBBBB FE
BBBBBBBBBBBBBBB: Binary ata
FE : ID as a binary ata
[ Note: If you need to insert the data [FE] in hexadecimal in the middle of the
text, convert it into two (2) bytes of hexadecimal data.]
FE  FDD8
If you nee to insert the ata [FD] in hexa ecimal in the mi le of the text,
convert it to two (2) bytes of hexa ecimal ata.
FD  FDDD
[ Note: aximum data length is 2046 bytes per packet.]
At the receive si e, the ata will be automatically eco e an isplaye on the
PC screen.
If the [ALF] comman is set ON, the LF (line fee ) co e will be a e at the en of
receive ata.
Digital Image Communication
Receive
When vali igital image ata is receive , it will be eco e an output as a vi eo
image from the VIDEO OUT connector.
If receive ata is missing uring a transmission, that portion will be isplaye as
invali (like noise).

19
Transmit
When pin - 4 of the microphone connector is groun e , the ARD9900 starts sen ing an
image.
When the Vi eo Through Function is activate (AVT comman is ON), pressing the TX
switch will enable output of the vi eo signal connecte to the Vi eo Input also be sent to
the vi eo output port, so that you can monitor the vi eo image. Press the TX switch
again to capture the image an then transmit it through the ra io equipment.
When the Vi eo Through Function is e-activate (AVT comman is OFF), pressing the
TX switch will automatically capture the vi eo image an then transmit it through the
ra io equipment.
A progress in icator will isplay on the monitor uring image transmission.