Pacific Microwave Research DT200S Digital Video/Audio Transmitter User Manual DT 200 User s Manual 90 74

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Pacific Microwave Research, Inc.
DT-200
Digital Microwave Video & Audio
Transmitter
USER’S MANUAL
Pacific Microwave Research, Inc.
1485 Poinsettia Avenue, Suite 111
Vista, CA 92083
760.295.5416
www.pmicrowave.com
IMPORTANT WARNING!
THIS EQUIPMENT WILL POSE A RADIATION HAZARD
IF IMPROPERLY HANDLED
Pacific Microwave Research, Inc. (PMR), in compliance with RF exposures limits set
forth in OET Bulletin 65, Fourth Edition, August, 1999.1 The following text is intended
to notify the user of PMR’s transmitter equipment that a radiation hazard could exist if
the DT-200S transmitter is improperly operated. The user should carefully read and
understand this section before operating equipment.
PMR’s DT-200S microwave transmitter is rated at 0.1W (+20 dBm) nominal RF power
output and has been designed as an intentional radiator. The device can deliver video and
audio signals over short ranges when used with PMR’s DR-200S receiver and appropriate
antennas in either fixed or mobile applications. When the DT-200S transmitter is
operating into an antenna, the system is emitting radio frequency energy!
An internal RF isolator prevents emission of energy at the antenna terminal when no
antenna is connected even when the transmitter is powered up. Because the DT-200S is
an isolator protected low power device, there is no hazard potential until a proper antenna
is connected to the RF output terminal. Safe operating procedures must be observed
when the unit is transmitting into an antenna.
Exposure is based upon the average amount of time spent within an electromagnetic field
(RF energy) with a given intensity (field intensity in mW/ cm2). There are two categories
of exposure situations; occupational/controlled and general population/uncontrolled.
Occupational/controlled limits apply in situations in which persons are exposed as a
consequence of their employment provided those persons are fully aware of the potential
for exposure and can exercise control over their exposure. These limits apply in
situations when an individual is transient through a location where
occupational/controlled limits apply provided the individual is made aware of the
potential for exposure.
General population/uncontrolled exposures apply in situations in which the general public
may be exposed, or in which persons that are exposed as a consequence of their
employment may not be fully aware of the potential for exposure or can not exercise
control over their exposure.
Exposure may be controlled by observing the safe distances found in the Table below and
remaining beyond those distances from the antenna at all times when the transmitter is
operational. At no time should the user remain within a distance less than the indicated
safe distance for a period greater than 30 minutes.
The complete text may be found at:
www.fcc.gov/bureaus/engineering_technology/documents/bulletins/oet65/oet65.pdf
The safe distance is based on the MPE exposure limits identified in Table 1. (FCC Limits
for Maximum Permissible Exposure) of OST 65. The maximum power density allowed
at 2400 MHz is 5 mW/cm2 for occupational/controlled exposure, and 1 mW/cm2 for
general population/uncontrolled exposure.
For fixed operations, based upon a maximum transmitter power output of 0.1W with an
antenna gain of +2 dBi, the safe distance is greater than 4 cm from the antenna for both
controlled and uncontrolled exposure.
Exposure level is relative to antenna gain. Gain antennas (parabolic dish, horn, helical,
Yagi, etc.) will increase the safe distance required. Table 1 indicates the safe distance for
fixed operations, within the main beam of the antenna, based upon a maximum
transmitter power output of 0.1W with an antenna gain of +2 dBi.
Frequency – 2400 MHz
TX Power – 0.1W (+20 dBm)
Antenna Gain - +2 dBi
Safe Distance from Antenna Under Fixed Conditions
Controlled Exposure (5 mW/cm2)
Uncontrolled Exposure (1 mW/cm2)
1.4 cm
3.2 cm
Table 1. FCC limits for MPE based on OST 65 for PMR DT-200S
If the DT-100S is operated at a fixed location and other transmitters are co-located, the
user must consider exposure as a result of the aggregate collection of transmitters at the
location. Increases of four times in radiated energy level will double the safe distance.
The user must calculate the safe distance for any given case based on the antenna
gain required for the application. Pacific Microwave Research can provide such
calculations in consultation with the user if required. Contact PMR at 760.295.5416 for
additional information.
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
1.1 Introduction
The DT-200 Digital COFDM Microwave Video and Audio Transmitter from Pacific
Microwave Research is a compact transmitter designed for short-range transmission
applications. Common uses include remote broadcasting (ENG, EFP), law enforcement
surveillance and video collection. The DT-200 is a compact unit designed for portable
and fixed applications and transmits remote video to a central receive location. The DT200 is designed to transmit one NTSC (or PAL) video signal plus two high quality audio
signals and an RS-232 data channel. The DT-200 operates from a nominal +12 Vdc
power source and is capable of up to 100mW of output power. The DT-200 uses Coded
Orthogonal Frequency Division Multiplex (COFDM) modulation to overcome the effects
of multipath.
2.0 Operation
The following section describes the proper operating techniques for the DT-200
transmitter including power, antenna, video, and audio connections. The DT-200
generates heat during normal operation. The user should give careful consideration to
mounting the transmitter in such a way as to insure heat is directed away from the
housing. An external heatsink may be desirable in some operational modes.
2.1 Primary Connections
A number of connections must be made in order for the DT-200 to operate properly.
These include dc power; transmit antenna, and video input.
WARNING
Prior to transmitting, the user should determine the proper frequency or
channel of operation. Operating on the wrong frequency could cause
interference to other licensed users. Part 90 users may coordinate
frequencies through nationally recognized frequency coordination bodies
or through local law enforcement user groups. Part 74 users should contact
their local frequency coordinator or check www.sbe.org for additional
information. Always verify a frequency is not in use before transmitting.
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
2.1.1 DC Power Input
The DT-200 is designed to operate from a nominal +12 Vdc power source; however, the
transmitter will operate with DC input voltages from +10 - +36 Vdc. DC power is
supplied through the front panel PT02E-8-4P (mate supplied) connector (J3) with +12
Vdc on Pin A and Ground on Pin C. This source should be fused at 2.0 A. Power
consumption is nominally 0.8 A. The DT-200 transmitter is operating whenever power is
applied. See Section 9.0 for J3 connector pin assignments.
2.1.2 Antenna
The antenna is connected to front panel female SMA connector (J1). Any resonant
antenna is suitable for connection. Antenna type and gain should be determined based
upon the intended application. The DT-200 is protected against opens or shorts at the
antenna terminal by an internal isolator. Only high quality coaxial cable should be used
to interconnect the transmitter and antenna. All SMA connectors should be tightened
with the appropriate 5/16” wrench using approximately 5 in./lbs of torque. MAXIMUM
TORQUE IS 8 IN./LBS. DO NOT OVERTIGHTEN. Thumb tight connections are not
suitable for reliable operation!
2.1.3 Video Input
Video is input to the DT-200 through the front panel BNC connector (J4). This
unbalanced input accepts a nominal 1 Vp/p video input. The transmitter may be
configured for the NTSC or PAL standard (See RS-232 control protocol). An isolated
video loop output is available to feed to other devices (i.e., monitor video) on the MDM15 connector (J2) with Pin 4 as video out and Pin 12 as video ground.
2.1.4 Audio Input
Audio is input to the DT-200 through the front panel MDM-15 connector (J2). The DT200 is configured for two audio channels. Each audio channel may be used with either
balanced or unbalanced sources with a nominal impedance of 600 Ω. When using a
balanced source, connect the positive going line to the (+) input and the negative going
line to the (-) input. When using an unbalanced source, connect the positive going line to
the (-) input and ground the (+) input.
The DT-200 may be configured for line or microphone level inputs (See RS-232 control
protocol). Line level audio is typically +9 dBm and microphone level is typically –45
dBm. The input for audio channel 1 is on Pin 1 (+) and Pin 3 (-). The input for audio
channel number 2 is on Pin 5 (+) and Pin 7 (-).
Unbalanced audio may be connected to the subcarrier inputs by connecting the high side
of the audio source to the (+) terminals and leaving the (-) terminals unconnected. Audio
1 ground is on Pin (2) and Audio 2 ground is on Pin (6). Microphone bias of +2.5 Vdc
(nom.) can be found on J3 Pin 8 to supply power to FET microphones. See Section 9.0
for J2 connector pin assignments.
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
The diagram (Table 1.) below details the proper wiring for both balanced audio and
unbalanced audio applications.
A1
A1 (-) Pin 3
A1 (+) Pin 1
Gnd, P2 & 6
A2
A2 (+) Pin 5
A2 (-) Pin 7
Balanced Audio Input Wiring
A1 (-) Pin 3
A1
A1 (+) Pin 1
Gnd, P2 & 6
A2 (+) Pin 5
A2
A2 (-) Pin 71
Unbalanced Audio Input Wiring
Table 1. DT-200 Audio Wiring
2.1.5 Data Channel Input
The DT-200 is capable of transmitting an asynchronous data signal using the RS-232
electrical interface. This is commonly connected to a GPS data stream or other telemetry
device. The serial data input connection is found on the front panel MDM-15 connector
(J2). Use the supplied MDM-15 mating connector to interface the RS-232 serial data
source to the DT-200.
To transmit RS-232 serial data, connect the data source to Pins 9 and 10 on connector J2.
Pin 9 is the data signal input to the DT-200 transmitter and Pin 10 is the ground
connection. See Section 9.0 for J2 connector pin assignments.
The serial data baud rate must be set using the RS-232 control protocol (Section 13.0).
Available baud rates are 1200, 2400, 4800, 9600, 19200, and 38400. The desired baud
rate is selected with the RS-232 protocol.
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
3.0 Power Output
The DT-200 is capable of operating at two power levels to fit a variety of operational
scenarios. The nominal power output on high power is 100 mW. The nominal power
output on low power is 10 mW. The power level selection is controlled via the RS-232
control protocol (Section 13.0).
4.0 Frequency
Frequency selection of the DT-200 is accomplished by operation of the front panel rotary
switch. Up to 10 channels may be programmed into the DT-200 via the RS-232 protocol.
Refer to the Data Sheet for the frequencies applicable to this transmitter. Additionally,
the frequency of operation of the DT-200 may be set via the RS-232 control protocol
(Section 13.0) for remote control applications.
5.0 Modulation Mode
The DT-200 is capable of operation using a variety of COFDM transmission modes.
Variables in the modulation mode include constellation format (QPSK or 16QAM), code
rate, and guard interval. The modulation modes are selected using the RS-232 control
protocol (Section 13.0). The PMR DR-100 or DR-200 receiver will automatically
determine the required receive parameters to match the selected transmitted modulation
mode. For most applications, QPSK, ½ Code Rate, and ¼ Guard Interval is the best
selection (factory default).
6.0
Security Key Code (optional)
The DT-200 may employ the Advanced Encryption Standard (AES) to provide link
security. The key code selected using the RS-232 control protocol (Section 13.0) and
must match the key code selected on the DR-100 or DR-200 receiver for the link to
operate normally. Key code 00 may be selected to transmit a secure signal to any DR100 or DR-200 receiver regardless of the key code setting of the receiver.
Security key code 00 is used to allow any DT-200 transmitter to communicate with any
DR-100 or DR-200 receiver in secure mode. The security key code must be set to key
code 00 on the DR-100 or DR-200 under this condition.
7.0 Status LED
The front panel status LED on the DT-200 provides the user with visual feedback on the
operating status of the transmitter as noted below. Fault conditions have priority over
normal operating conditions.
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
Status
Video Present
No Video
Status
Low Voltage
High Temp
Normal Operation
Color
State
Green
Steady
Green
Flashing
Fault Operation
Color
State
Red
Flashing
Red
Steady
Priority
Priority
Table 2. DT-200 Status LED Indications
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Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
8.0 Specifications
Electrical:
• Model Number - Frequency Range
o DT-200P – 340 to 400 MHz
o DT-200L – 1.7 to 1.9 GHz
o DT-200S – 1.9 to 2.7 GHz
o DT-200C1 – 3.1 to 3.5 GHz
o DT-200C2 – 4.4 to 5.0 GHz
• Modulation – COFDM 2K
• Frequency Stability – +0.002%
• Spurious/Harmonic Output – > -65 dBc
•
•
•
•
•
•
•
•
Compression – MPEG-2
Video Input Format – NTSC or PAL
Video Input Impedance – 75 Ω unbalanced
Audio –
o 200 Hz to 15 kHz +1.5 dB
ƒ Microphone Level (2x)
Data – RS-232 interface (standard baud
rates to 38.4 kb/s)
Power Output
o High Power – 100 mW nominal
Channels : Up to 10 programmable
RS232 programming interface
Environmental:
• Operating temperature: -10 to +55 °C
•
Relative Humidity: 0 to 95%, noncondensing
Mechanical:
• PTO 4-pin power
•
Housing – milled aluminum
•
•
MDM-15 pin audio/data
Dimensions – 5.3” L x 3.5” W x 1.125” H
•
•
Weight – 15 oz.
RF Output Connector – SMA female
•
Video Input Connector – BNC female
•
Channel Select Switch - 10 position
•
Current: 0.75 A @ 13.8 Vdc
Power:
• Operating voltage: +10 to +36 Vdc
Options:
Belt Clip
Mounting interface for tactical robots
Accessories:
Antennas: Helmet mounted antenna systems.
Battery: Rechargeable belt mounted battery.
Helmet mounted color video camera (NTSC or PAL)
Camera:
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
9.0 Connector Pin-out
The following table applies to the MDM-15 (J2) located on the front panel of the DT-200
transmitter. The DT-200 is supplied with the mating connector.
PIN #
MDM-15 Function (J2)
10
11
12
13
14
15
Audio 1 (+)
Audio 1 Ground
Audio 1 (-)
Monitor Video Output
Audio 2 (+)
Audio 2 Ground
Audio 2 (-)
Microphone Bias
Data Channel Input (+)
Data Channel Input (-)
RESERVED
Video Ground
RS-232 Control Input (+)
RS-232 Control Common (-)
RS-232 Control Output (+)
Table 3. DT-200 MDM-15 Wiring
The following table applies to the PT02E-8-4P (J3) located on the front panel of the DT200 transmitter. The DT-200 is supplied with the mating connector.
PIN #
PT02E-8-4P Function
(J3)
+10 - +36 Vdc Input
N/C
Ground
N/C
Table 4. DT-200 DC Connector Wiring
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Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
10.0 Front Panel Controls
Status LED
Channel Selector
DC Input
Video Input
RF Output
Remote Control
Audio
Data
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Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
11.0 Mechanical
3.500
5.300
Clearance for #4-40 (4 plc. typ.)
Mounting holes are 0.125 from each corner
All Dimensions in Inches
1.125
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
12.0 Repair
There are no user serviceable parts inside the DT-200. Damage to the QC seals on the
transmitter voids the warranty. Should your unit require service, contact Pacific
Microwave Research, Inc. at 760.295.5416 or www.pmicrowave.com to request an RMA
number.
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10
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
13.0 RS-232 Control Protocol
1.0.0
General Characteristics
1.
Processor type = PIC18F6620
2.
Processor Osc. = 16.0 MHz
3.
RS232 Communications, Baud Rate 9600, N, 8, 1
2.0.0
RS-232 Control Commands
All commands are case sensitive.
The response to any syntactically VALID command is “$V#”.
The response to any syntactically INVALID command is ‘$I#’.
The response to any syntactically VALID, but incorrect command is “$E#”.
Valid (“V”) or invalid (“I”) responses refer to command syntax and are only an indication the
command was entered correctly. They are not an indication of command success. Responses are
prefixed with a $ and suffixed with a #.
1.
Change Communications Mode
This command defines the operation mode of the DT200. The Mode is defined as “Local”
when the unit is controlled via front panel selection. The Mode is defined as “Remote”
when the unit is controlled via RS232 serial commands.
When in local mode the response to all commands except $MR# will be ‘I’.
Command Syntax:
$Ma#
where:
a=L
a=R
Local mode
Remote mode
Example:
Command
Select Local operation
Select Remote operation
2.
$ML#
$MR#
Response
$V#
$V#
Change RF Channel
This command selects the operating RF channel of the unit. The frequency value for each
channel is programmed using the “Channel Frequency Programming Command”. There
are 10 channels available numbered 01 through 10.
If the selected channel is outside the range of previously programmed channels, no change
in channel will occur. The unit response will be “I”.
Command Syntax:
$Nnn#
where:
nn = channel number 01 through 10
Example:
Command
Change to channel five
$N05#
Change to channel 27 (invalid) $N27#
11
Response
$V#
$I#
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
3.
Change RF Frequency in MHz
This command selects the RF operating frequency of the unit. The frequency is defined as
any four digit number.
Command Syntax:
$Fnnnn#
where:
nnnn = RF frequency (MHz). Frequency must be within
selected band and conform to licensed parameters.
Example:
Command
Change RF to 2459 MHz
$F2459#
Change RF to invalid channel $FJUNK#
4.
Response
$V#
$I#
Change Audio 1 Level
This command selects the allowable audio input level for Audio 1 channel. The available
input levels may be selected as Microphone Input or Line Input. Nominal microphone
input level is –45 dBm. Nominal line input level is +9 dBm.
Command Syntax:
$Aa#
where:
a=M
Selects mic level
a=L
Selects line level
Example:
Change Aud1 to Mic Level
Change Aud1 to Line Level
5.
Command
$AM#
$AL#
Response
$V#
$V#
Change Audio 2 Level
This command selects the allowable audio input level for Audio 2 channel. The available
input levels may be selected as Microphone Input or Line Input. Nominal microphone
input level is –45 dBm. Nominal line input level is +9 dBm.
Command Syntax:
$Ba#
where:
a=M
Selects mic level
a=L
Selects line level
Example:
Change Aud2 to Mic Level
Change Aud2 to Line Level
6.
Command
$BM#
$BL#
Response
$V#
$V#
Change Key Select
This command selects the number of the encryption key that is operational. The
encryption key value for each key number is programmed using the “Encryption Key
Programming Command”. There are 16 available key numbers.
Command Syntax:
$Knn#
where:
nn = Desired key, 00 through 15
Example:
Change to Key 3
Command
$K03#
12
Response
$V#
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
7.
Change Input Video Standard
This command selects the input video standard. The two available standards are PAL and
NTSC.
Command Syntax:
$Va#
where:
a=P
a=N
Selects PAL video standard
Selects NTSC video standard
Example:
Change video to PAL
Change video to NTSC
8.
Command
$VP#
$VN#
Response
$V#
$V#
Change Modulation Constellation
This command selects the modulation constellation type.
Command Syntax:
$Ln#
where:
n=0
Selects QPSK
n=1
Selects 16QAM
Example:
Change Constellation to QPSK
Change Constellation to 16QAM
9.
Command
$L0#
$L1#
Response
$V#
$V#
Change COFDM Guard Interval
This command selects the COFDM guard interval.
Command Syntax:
$Gn#
where:
n=0
Selects 1/4 guard interval
n=1
Selects 1/8 guard interval
n=2
Selects 1/16 guard interval
n=3
Selects 1/32 guard interval
Example:
Change Guard to ¼
Change Guard to 1/8
Change Guard to 1/16
Change Guard to 1/32
10.
Command
$G0#
$G1#
$G2#
$G3#
Change COFDM Forward Error Correction
This command selects the COFDM FEC value.
Command Syntax:
$En#
The available FEC values are:
n=1
n=2
n=3
n=4
n=4
13
FEC of 1/2
FEC of 2/3
FEC of 3/4
FEC of 5/6
FEC of 7/8
Response
$V#
$V#
$V#
$V#
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
Example:
Change FEC to ½
Change FEC to 2/3
Change FEC to ¾
Change FEC to 5/6
Change FEC to 7/8
11.
Command
$E0#
$E1#
$E2#
$E3#
$E4#
Response
$V#
$V#
$V#
$V#
$V#
Change RF Power Output mode
This command selects the transmitter RF power output mode. The attenuator will be set
according to corresponding variable values.
Command Syntax:
$Pn#
The available output levels are:
n=0
Selects standby mode
n=1
Selects low power mode
n=2
Selects high power mode
Example:
Change Power to standby
Change Power to low
Change Power to high
12.
Command
$P0#
$P1#
$P2#
Response
$V#
$V#
$V#
Change Data Channel RS232 Baud Rate
This command selects the available asynchronous data transmission rate of the data
channel.
Command Syntax: $Tn#
The available rates are:
n=0
Selects 1200 bps
n=1
Selects 2400 bps
n=2
Selects 4800 bps
n=3
Selects 9600 bps
n=4
Selects 19200 bps
n=5
Selects 38400 bps
Example:
Change Rate to 1200 baud
Change Rate to 2400 baud
Change Rate to 4800 baud
Change Rate to 9600 baud
Change Rate to 19200 baud
Change Rate to 38400 baud
13.
Command
$T0#
$T1#
$T2#
$T3#
$T4#
$T5#
Response
$V#
$V#
$V#
$V#
$V#
$V#
Change Frequency Band
This command selects the RF operating band of the unit.
Command Syntax:
$Qa#
The allowable bands are as follows:
a=P
Selects P Band (300 MHz to 500 MHz)
a=T
Selects T Band (800 MHz to 1000 MHz)
14
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
a=L
a=S
a=3
a=C
Selects L Band (1200 MHz to 1900 MHz)
Selects S Band (2000 MHz to 2700 MHz)
Selects 3G Band (3000 MHz to 3900 MHz)
Selects C Band (4000 MHz to 5000 MHz)
Example:
Command
$QP#
Change Band to P Band
3.0.0
Response
$V#
RS-232 Verification Commands (Must be in Remote Mode)
1.
Read Local/Remote Mode condition
This command returns the current communications mode.
Command Syntax: $M?#
Example:
Command
$M?#
Check communications mode
(currently in Local mode)
2.
Response
$?ML#
Read RF Channel
This command returns the current RF output channel.
Command Syntax: $N?#
Example:
Command
$N?#
Check RF Channel (currently 01)
3.
Response
$?N01#
Read RF Frequency
This command returns the current operational RF output frequency.
Command Syntax: $F?#
Example:
Check RF Frequency
4.
Command
$F?#
Response
$?F1234#
Read Audio 1 Level
This command returns the current operational status of Audio 1 Input level.
Command Syntax:
$A?#
where the response is:
Line level
Microphone level
Example:
Command
$A?#
Check Audio 1 level
$A?#
15
Response
$?AL#
(line)
$?AM#
(mic)
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
5.
Read Audio 2 Level
This command returns the current operational status of Audio 2 Input level.
Command Syntax:
$B?#
where the response is:
Selects Line level
Selects Microphone level
Example:
Command
$B?#
Check Audio 2 level
Response
$?BL#
(line)
$?BM#
(mic)
$B?#
6.
Read channel information
This command returns the current number and frequency of operational RF channels
programmed into the unit.
Command Syntax:
$N*?#
where the response is of the format:
$?N*aa,xxxx,xxxx,xxxx…xxx#
Example:
Command
$N*?#
Read Channel Freq’s
7.
Response
$?N*02,1700,1720#
(Currently two chan.:1700 and 1720)
Read Status of Video, Temperature, and Voltage
This command returns the current fault status.
Command Syntax:
$S?#
Example:
Command
Response
$S?#
$?S,OK-VID,TEMP-075,VDC-1353#
(Current Status: 75 ˚C, 13.53 Vdc)
Read Status
8.
Read Input Video Standard
This command returns the current operational video input standard.
Command Syntax:
$V?#
Valid responses would include:
N = NTSC
P = PAL
Example:
Command
$V?#
Read input standard
$V?#
16
Response
$?VN#
(NTSC)
$?VP#
(PAL)
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
9.
Read Modulation constellation mode
This command returns the current modulation constellation.
Command Syntax:
$L?#
Valid responses would include:
0 = QPSK
1 = 16QAM
Example:
Command
$L?#
Read modulation mode
$L?#
10.
Response
$?L0#
(QPSK)
$?L1#
(16QAM)
Read COFDM Guard Interval
This command returns the current guard interval.
Command Syntax:
$G?#
Valid responses would include:
0 = 1/4 guard interval
1 = 1/8 guard interval
2 = 1/16 guard interval
3 = 1/32 guard interval
Example:
Command
$G?#
Read Guard Interval
11.
Response
$?G0#
(1/4)
Read COFDM Forward Error Correction
This command returns the current forward error correction setting.
Command Syntax:
$E?#
Valid responses would include:
1 = FEC of 1/2
2 = FEC of 2/3
3 = FEC of 3/4
4 = FEC of 5/6
4 = FEC of 7/8
Example:
Command
$E?#
Read forward error correction
12.
Response
$?E1#
(1/2)
Read Complete Modulation Mode
This command returns the current operational COFDM modulation parameters.
Modulation MODE consists of FEC, Guard, Constellation.
Command Syntax:
$D?#
17
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
Example:
Command
$D?#
Check Modulation MODE
13.
Response
$?D1/2,1/16,QPSK#
Read RF Output Power mode
This command returns the current RF power output mode.
Command Syntax:
$P?#
Valid responses include:
0 = Standby
1 = Low Power
2 = High Power
Example:
Command
$P?#
Check RF Output
14.
Response
$?P1#
(low)
Read Data Channel RS232 Baud Rate
This command returns the current asynchronous data transmission rate of the data channel.
Command Syntax:
$T?#
Valid responses include:
0 = 1200 bps
1 = 2400 bps
2 = 4800 bps
3 = 9600 bps
4 = 19200 bps
5 = 38400 bps
Example:
Command
$T?#
Check RS232 Baud rate
15.
Response
$?T2#
(2400)
Read Frequency Band
This command returns the current RF operating band.
Command Syntax:
$Q?#
Valid responses include:
P = P Band (300 MHz to 500 MHz)
T = T Band (800 MHz to 1000 MHz)
L = L Band (1200 MHz to 1900 MHz)
S = S Band (2000 MHz to 2700 MHz)
3 = 3G Band (3000 MHz to 3900 MHz)
C = C Band (4000 MHz to 5000 MHz)
Example:
Command
$Q?#
Check RF operating band
18
Response
$?QC#
(C-band)
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
16.
Read Encryption Key Number
This command returns the current operational encryption key number.
Command Syntax:
$K?#
Valid responses are of the format:
$?Knns#
where:
nn = Current encryption key
s=D
Default (hardcoded) Encryption key source
s = none User (EEPROM) Encryption key source
Example:
Command
$K?#
Check Key Number
17.
Response
$?K1#
Read Motherboard Firmware Part number and Version
This command returns, as a string, the motherboard firmware part number and version
number.
Command Syntax:
$MF?#
Valid responses include:
0 = Automatic Power Level control OFF
1 = Automatic Power Level control ON
Example:
Command
Response
Check motherboard firmware p/n and version
$MF?#
$?MF101683,01.01.01#
(Currently p/n:101683 and version 01.01.01)
18.
Read Serial Number
This command returns the DT-200 Serial number. The serial number is stored as a four
digit number.
Command Syntax:
$SN?#
Valid responses are four digits long
Example:
Command
$SN?#
Read DT200 serial number
4.0.0
Response
$?SN:1526#
(S/N:1526)
RS-232 Programming Commands (Must be in Remote Mode)
1.
Program Channel Frequencies
Program RF Channels with new frequency values by using a string command separated
by commas.
The number of channels must be defined.
A maximum of 16 channels may be defined with designators 01 through 10.
Channel frequencies are in MHz.
All channel frequencies must be included.
Command Syntax:
$Nnn,xxxx,xxxx,xxxx…xxxx#
nn = Number of channels, 01 through 10
xxxx = Channel frequencies in MHz
19
Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
Examples:
Program 1 channel
Program 6 channels
2.
Command
Response
$N01,4410#
$N06,4590,4870,4910,4950,5000,5000#
Write User Encryption Key
This command defines the user portion (suffix) of the encryption key.
There are a maximum of 16 user keys (nn), numbered 00 through 15.
Changes can be made to only one user key at a time.
Each user key (xxx) consists of eight numbers, ranging from 0 – 255.
Command Syntax: $KUnn,xxx,xxx,xxx,xxx,xxx,xxx,xxx,xxx#
Example:
Command
Response
To create user key 01
$KU01,125,200,84,15,254,106,219,3#
(consisting of numbers 125,200, 84, 15,254, 106, 219, 3)
5.0.0
Complete Command List
1.
Program Channel Frequencies
COMMAND TYPE
WRITE/MODE
Communications mode
CHANGE
QUERY
$Ma#
$M?#
Serial Number
#Channel (current)
$SN?
$Nnn,xxxx,xxxx…xxxx#
$Nnn#
$N?#
Channels (All)
$N*?#
Status
(Video, Temp., Voltage)
$S?#
Frequency
$Fnnnn#
$F?#
Audio 1
$Aa#
$A?#
Audio 2
$Ba#
$B?#
Current Key number
$Knn#
$K?#
$Va#
$V?#
User Encryption key
$KUnn,xxx,xxx…,xxx#
Video standard
Read Motherboard
Firmware P/N and Version
$MF?#
Modulation mode (Complete)
$D?#
Modulation Constellation
$Ln#
$L?#
COFDM Guard Interval
$Gn#
$G?#
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Pacific Microwave Research, Inc.
DT-200 User’s Manual
©2006
COFDM FEC
$En#
$E?#
Output Power Mode
$Pn#
$P?#
RS232 Baud Rate
$Tn#
$T?#
Frequency Band
$Qa#
$Q?#
21

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