MS2711A
Hand-Held
Spectrum Analyzer
Programming Manual
Hand-Held Spectrum Analyzer, for Measuring,
Monitoring and Analyzing Signal Environments
WARRANTY
The Anritsu product(s) listed on the title page is (are) warranted against defects in materi
als and workmanship for one year from the date of shipment.
Anritsu’s obligation covers repairing or replacing products which prove to be defective
during the warranty period. Buyers shall prepay transportation charges for equipment re
turned to Anritsu for warranty repairs. Obligation is limited to the original purchaser.
Anritsu is not liable for consequential damages.
LIMITATION OF WARRANTY
The foregoing warranty does not apply to Anritsu connectors that have failed due to normal wear. Also, the warranty does not apply to defects resulting from improper or inadequate maintenance by the Buyer, unauthorized modification or misuse, or operation
outside the environmental specifications of the product. No other warranty is expressed or
implied, and the remedies provided herein are the Buyer’s sole and exclusive remedies.
TRADEMARK ACKNOWLEDGEMENTS
MS-DOS, Windows, and Windows for Workgroups are registered trademarks
of the Microsoft Corporation.
Site Master and Cable Mate are trademarks of Anritsu Company.
NOTICE
Anritsu Company has prepared this manual for use by Anritsu Company personnel and
customers as a guide for the proper installation, operation, and maintenance of Anritsu
Company equipment and computer programs. The drawings, specifications, and informa
tion contained herein are the property of Anritsu Company, and any unauthorized use or
disclosure of these drawings, specifications, and information is prohibited; they shall not
be reproduced, copied, or used in whole or in part as the basis for manufacture or sale of
the equipment or software programs without the prior written consent of Anritsu Com
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pany.
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Index
How To Use This Manual ...................................1
Programming Manual Organization .................... 1
Programming Overview
General Description ..........................................2
Cabling ....................................................2
Serial Communication Parameters ..............................2
Communications Error Checking ...............................2
Parameter Validation ........................................2
Entering Remote Mode .......................................3
Exiting Remote Mode ........................................3
Lifetime of Changes to Spectrum Analyzer Operating Parameters ....3
Write Cycle Limitation of EEPROM .............................3
Functional Description
Initialize
Enter remote mode ...................................4
Enter remote mode immediately ........................4
Configure
System
Measurement
Power Monitor
Frequency
LCD backlight ............................... 4
Watch dog timer.............................. 4
Serial port echo .............................. 4
Sweep mode select............................ 4
Printer type ................................. 4
Automatically save runtime setup................4
Return sweep time ............................4
AM/FM demodulation..........................4
Set sweep averaging...........................4
Measurement mode select...................... 4
Get Power levels ..............................5
Power Monitor Units of measure.................5
Relative mode ................................5
Offset mode..................................5
Zero mode ...................................5
Start frequency .............................. 5
Stop frequency ............................... 5
Center frequency .............................5
Frequency span...............................5
May 2001 10580-00049
Copyright 2000-2001 Anritsu Co. Revision: B
Utility
Display
Display mode ................................ 5
Ref level .................................... 5
dB/div ...................................... 5
Markers
On/Off...................................... 5
Delta Status On/Off ...........................5
Value....................................... 5
Marker to Peak...............................5
Marker to Center .............................5
Single Limits
On/Off...................................... 6
Beep ....................................... 6
Value....................................... 6
Multiple Limits
On/Off ......................................6
Beep........................................6
Value .......................................6
A/B Trace
A/B trace select...............................6
Timeset............................................ 6
Date set ............................................ 6
Reference number set................................. 6
Read time ...........................................6
Read date ...........................................6
Action
Trigger sweep ....................................... 6
Save system setup ................................... 6
Recall system setup .................................. 6
Save sweep ......................................... 7
Query trace names....................................7
Query trace memory ..................................7
Download sweep trace.................................7
Delete sweep trace....................................7
Write Antenna .......................................7
Recall Antenna.......................................7
Data
Recall sweep ........................................ 7
Measurement
Measure OCC BW % of Power ..........................7
Measure OCC BW dB Down ............................7
ii MS2711A PM
Set Max Hold ........................................7
Set Resolution BW Frequency ..........................7
Set Video BW Frequency...............................7
Set Attenuation ......................................7
Set field strength measurement .........................7
Set channel power ....................................7
Read channel power...................................7
Set adjacent channel power ............................7
Read adjacent channel power ...........................7
Status
Query system status.................................. 8
Self-test Trigger ..................................... 8
Battery status .......................................8
Close
Exit remote mode .................................... 8
Control Byte Descriptions
Control byte summary ........................................9
Control byte 1 Setup system ........................... 11
Control byte 3 Select measurement mode ................ 11
Control byte 7 Read time/date ..........................12
Control byte 8 Set time/date........................... 12
Control byte 9 Set reference number .................... 12
Control byte 10 Serial port echo on/off.................... 13
Control byte 12 Watch dog timer on/off ................... 13
Control byte 16 Store sweep trace ....................... 14
Control byte 17 Recall sweep trace....................... 14
Control byte 18 Save system setup....................... 17
Control byte 19 Recall system setup ..................... 17
Control byte 20 Query system status..................... 18
Control byte 21 Trigger self-test......................... 21
Control byte 24 Query trace names.......................21
Control byte 25 Delete sweep trace .......................22
Control byte 26 Download sweep trace ....................22
Control byte 27 Query sweep memory.....................25
Control byte 30 Select printer type .......................25
Control byte 34 Set A/B trace ...........................25
Control byte 39 Query power level .......................26
Control byte 40 Set power monitor unit ...................26
Control byte 41 Relative mode on/off......................27
Control byte 42 Offset mode on/off .......................27
Control byte 43 Zero mode on/off.........................27
Control byte 48 Trigger sweep .......................... 28
Control byte 50 Check battery status .....................28
Control byte 64 Automatically save runtime setup ..........28
Control byte 69 Enter remote mode ...................... 29
MS2711A PM iii
Control byte 70 Enter remote mode immediately............29
Control byte 82 Write antenna ..........................30
Control byte 83 Recall antenna ..........................30
Control byte 84 Set Field Strength Measurement ...........31
Control byte 85 Set Channel Power.......................31
Control byte 86 Read Channel Power .....................31
Control byte 87 Set Adjacent Channel Power...............32
Control byte 88 Read Adjacent Channel Power .............32
Control byte 96 Measure OCC BW % of Power..............33
Control byte 97 Measure OCC BW dB Down ...............33
Control byte 99 Set Frequency...........................34
Control byte 100 Set Center Freq/Span ....................34
Control byte 101 Set Scale...............................35
Control byte 102 Set Marker .............................35
Control byte 103 Set Single Limit .........................36
Control byte 105 Set Max Hold ...........................36
Control byte 106 Set Resolution Bandwidth.................36
Control byte 107 Set Video Bandwidth .....................37
Control byte 108 Set Sweep Mode .........................37
Control byte 109 Set Marker to Peak ......................38
Control byte 110 Set Marker to Center.....................38
Control byte 111 Set Attenuation .........................38
Control byte 112 Set AM/FM Demodulation.................39
Control byte 113 Set Multiple Limit .......................39
Control byte 114 Set Return Sweep Time...................40
Control byte 118 Set Sweep Averaging .....................40
Control byte 255 Exit remote mode ....................... 40
Parameter definitions ......................................41
iv MS2711A PM
If you want to find out
general concepts for programming the Spectrum Analyzer,
go to the Programming Overview.
If you want to find out
how to perform a task,
go to the Functional Description.
If you want to find out
what the syntax of a control byte is,
go to the Control Byte Description.
Programming Manual Organization
Programming Overview
How to Use this Manual
This section contains general information about programming the Spectrum Analyzer. It is an introduction
and helps you get started.
Functional Descriptions
This section includes a complete list of tasks you can control via the serial port. These are high level descriptions. Each task refers you to the appropriate individual control byte for details.
Control Byte Descriptions
This section contains detailed explanations for each of the control bytes.
MS2711A PM 1
Programming Overview
This programming manual is written exclusively for the Anritsu Hand-Held Spectrum Analyzer Model
MS2711Awith firmware Version 1.30 and above. For information on firmware upgrade, please contact your
local Anritsu service center.
General Description
The MS2711Amust first be set into “remote” mode for communication with a computer. Remote mode differs
from normal continuous sweep and single-sweep modes. During remote mode, the Spectrum Analyzer sus
pends normal operations and attends to the serial port. The front panel display indicates when the Spectrum
Analyzer is in remote mode.
Once in remote mode, you send a series of control bytes and associated data to the Spectrum Analyzer. These
control byte sequences command the unit to perform various functions and activities. The serial port sup
ports virtually all features accessible from the keypad. The only exception is the printer, which requires con
nection to the same 9 pin connector on the MS2711Arear panel.
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To complete the communication session, send the control byte to exit remote mode. Spectrum Analyzer re
sumes normal operations. You may also exit the remote mode by using the <ESCAPE> key.
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Cabling
Serial communications take place via the 9 pin connector on the back of the MS2711A. The Spectrum Analyzer is a DTE-type serial device and therefore requires a “null modem” cable for communication with a computer, which is also a DTE device. A serial “null modem” interface cable is provided with your MS2711A.
Serial Communication Parameters
The Spectrum Analyzer communicates at a baud rate of 9600. It uses no parity bits, 8 data bits, and 1 stop
bit (N-8-1). No hardware handshaking is used.
Communications Error Checking
Since there is no hardware handshaking, byte level error handling must be done by the controlling program.
The expected number of response bytes for each control byte (listed in the control byte description section of
this manual) works well for responses coming from the Spectrum Analyzer. For data streams going to the
MS2711A, the “watch dog timer” protects against interrupted transmissions by aborting a control byte se
quence if the inter-byte time limit is exceeded.
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Parameter Validation
The MS2711Avalidates input parameters for each control byte sequence. If the input parameters are out of
range or invalid, the Spectrum Analyzer notifies the computer by sending Parameter Error Byte #224 (E0h).
The Spectrum Analyzer discards the received data and waits for the next control byte.
2 MS2711A PM
Entering Remote Mode
Send the Enter Remote Mode Byte #69 (45h) to the Spectrum Analyzer to enter remote mode at the end of a
sweep. Send the Enter Remote Mode Immediately byte #70 (46h) to enter remote mode in the middle of a
sweep.
The MS2711A’s serial port buffer is one byte wide. No internal buffer exists, so waiting is essential. If the
Spectrum Analyzer is not in remote, sending a second byte overwrites the original byte commanding it to go
into remote. If you send control byte #69, you must wait until the end of the sweep. If you send control byte
#70, the unit will enter remote mode as it receives the byte. Note that this means the data stored for the cur
rent sweep may be incomplete.
Once you receive the response string from Spectrum Analyzer, you’re in remote mode.
Exiting Remote Mode
Send the Exit Remote control byte #255 (FFh) to the MS2711A. The Spectrum Analyzer sends a response
byte of 255 (FFh) then exits remote mode.
Lifetime of Changes to Spectrum Analyzer Operating Parameters
System parameters changed during remote mode remain changed for normal operation. They are not automatically written to the non-volatile EEPROM. Turning off power erases the changed settings.
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If you want the changes saved, you must save the change to one of the setup memories. Use either the
run-time setup (location 0, which holds the power-on defaults) or one of the ten saved setups. See control
byte #18 (12h) for details. You can also use control byte #64 to specify that the runtime setup be automatically saved to setup location 0 when exiting remote mode.
Write Cycle Limitation of EEPROM
The EEPROM, used to store setups, has a guaranteed lifetime of at least 100,000 write cycles and an unlim
ited number of read cycles. The write cycle limitation is for a specific location. For example, you can store
setup #1 100,000 times and setup #2 100,000 times, etc.
It is for this reason we do not automatically store the changed system parameters to EEPROM. Instead, we
provide a means of changing the operating parameters independent of this limitation.
Be aware of the EEPROM write cycle limitation when programming the MS2711A. Keep the number of
write cycles to a minimum.
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MS2711A PM 3
Functional Description
INITIALIZE
Enter remote mode - see control byte #69 (45h)
The Spectrum Analyzer must be in remote mode for further control byte command sequences to be
accepted. Remember to wait until the Spectrum Analyzer responds before issuing further control
byte sequences.
Enter remote mode immediately - see control byte #70 (46h)
CONFIGURE SYSTEM
LCD backlight -see control byte #1 (01h)
LCD backlight helps in adverse lighting conditions.
Watch dog timer - see control byte #12 (0Ch)
Used to guard against interrupted data transfers to the Spectrum Analyzer.
Serial port echo - see control byte #10 (0Ah)
Use this to synchronize the Spectrum Analyzer sweep and computer requests for current trace data.
The Spectrum Analyzer goes into single sweep mode. It sends the sweep complete byte #192 (C0h)
after the completion of each sweep. You must send the sweep trigger byte #48(30h) for the Spectrum
Analyzer to perform another sweep. Retrieve the trace data using control byte #17 (11h).
Sweep mode select - see control byte #108 (6Ch)
Sweep mode is selectable as single sweep or continuous sweep mode.
Printer type - see control byte #30 (1Eh)
Printer type is selectable.
Automatically save runtime setup - see control byte #64 (40h)
Return sweep time -see control byte #114 (72h)
AM/FM demodulation - see control byte #112 (70h)
Set Sweep Averaging - see control byte #118 (76h)
CONFIGURE MEASUREMENT
Measurement mode select - see control byte #3 (03h)
Measurement mode is selectable as tracking generator mode, spectrum analyzer mode, or power
monitor mode.
4 MS2711A PM
CONFIGURE POWER MONITOR
The power monitor is available as an option.
Get Power levels - see control byte #39 (27h)
Querying the Spectrum Analyzer gives the raw and corrected power levels plus information about
the configuration.
Power Monitor Units of measure - see control byte #40 (28h)
Relative Mode - see control byte #41 (29h)
Offset Mode - see control byte #42 (2Ah)
Zero Mode - see control byte #43 (2Bh)
CONFIGURE FREQUENCY
Start frequency - see control byte 99 (63h)
Stop frequency - see control byte #99 (63h)
Center frequency - see control byte #100 (64h)
Frequency span - see control byte #100 (64h)
CONFIGURE DISPLAY
Display mode - see control byte #3 (03h)
Selectable as spectrum analyzer or power monitor.
Ref level - see control byte #101 (65h)
dB/div - see control byte #101 (65h)
CONFIGURE MARKERS
Marker (on/off) - see control byte #102 (66h)
Marker Delta Status (on/off) - see control byte #102 (66h)
Marker value - see control byte #102 (66h)
Marker to Peak - see control byte #109 (6Dh)
Marker to Center - see control byte #110 (6Eh)
MS2711A PM 5
CONFIGURE SINGLE LIMITS
Limit (on/off) - see control byte #103 (67h)
Limit beep (on/off) - see control byte #103 (67h)
Limit beep (if data above/below limit line) - see control byte #103 (67h)
Limit value - see control byte #103 (67h)
CONFIGURE MULTIPLE LIMITS
Limit (on/off) - see control byte #113 (71h)
Limit beep (on/off) - see control byte #113 (71h)
Limit value - see control byte #113 (71h)
CONFIGURE A/B TRACE
A/B trace select - see control byte #34 (22h)
Set up A and B trace definitions.
UTILITY
ASCII text strings, which are stored with each sweep, help identify the stored traces. Use these control bytes
to modify the strings before storing the trace.
Time set - see control byte #8 (08h)
Date set - see control byte #8 (08h)
Reference number set - see control byte #9 (09h)
Read Time - see control byte #7 (07h)
Read Date - see control byte #7 (07h)
ACTION
Trigger sweep - see control byte #48 (30h)
Both serial port echo and single sweep modes use this byte to trigger a Spectrum Analyzer sweep. If
the Spectrum Analyzer is not in one of those modes, this byte is ignored.
Save system setup - see control byte #18 (12h)
Recall system setup - see control byte #19 (13h)
6 MS2711A PM
Save sweep - see control byte #16 (10h)
Query trace names - see control byte #24 (18h)
Query trace memory - see control byte #27 (1Bh)
Download sweep trace - see control byte #26 (1Ah)
Delete sweep trace - see control byte #25 (19h)
Write Antenna - see control byte #82 (52h)
Recall Antenna - see control byte #83 (53h)
DATA
Recall sweep - see control byte #17 (11h)
Use this control byte to obtain stored traces or the current measurement data from the Spectrum An
alyzer. All traces and modes use the same trace data format.
MEASUREMENT
Measure OCC BW % of Power - see control byte #96 (60h)
Measure OCC BW dB Down - see control byte #99 (63h)
Set Max Hold - see control byte #105 (69h)
Set Resolution BW Frequency - see control byte #106 (6Ah)
Set Video BW Frequency - see control byte #107 (6Bh)
Set Attenuation - see control byte #111 (6Fh)
Set field strength measurement - see control byte #84 (54h)
Set channel power - see control byte #85 (55h)
Read channel power - see control byte #86 (56h)
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Set adjacent channel power - see control byte #87 (57h)
Read adjacent channel power - control byte #88 (58h)
MS2711A PM 7
STATUS
Query system status - see control byte #20 (14h)
The system status contains virtually all information about the current Spectrum Analyzer system
state. It is a powerful and complete “snapshot” of the system.
Some control bytes affect multiple system parameters. Use the response from this control byte for
preserving any of the system parameters you wish to remain unchanged.
Self-test Trigger - see control byte #21 (15h)
Upon receiving this control byte the Spectrum Analyzer runs self-test. After completion of the
self-test, the Spectrum Analyzer sends the results via the serial port.
Battery status - see control byte #50 (32h)
Returns the smart battery status.
CLOSE
Exit remote mode - see control byte #255 (FFh)
Ends communication with the Spectrum Analyzer. “Exiting remote mode” returns the Spectrum Analyzer to normal operation.
8 MS2711A PM
Control Byte Summary
Control Byte Summary (1 of 2)
Control
Byte #
1 (01h)
3 (03h)
7(07h)
8 (08h)
9 (09h)
10 (0Ah)
12 (0Ch)
16 (10h)
17 (11h)
18 (12h)
19 (13h)
20 (14h)
21 (15h)
24 (18h)
Name Description
Setup system Sets system status flags and switches Yes
Select measurement mode Sets measurement mode Yes
Read time/date Reads time and date from the real time clock ––
Set time/date Sets the real time clock time and date Yes
Set reference number Sets reference number for a sweep trace Yes
Serial port echo On/Off Allows synchronization of the Spectrum Analyzer and request from
computer for sweep trace
Watch-dog timer On/Off Enable or disable the watch-dog timer —Store sweep trace Save current trace data to EEPROM Yes
Recall sweep trace Queries the MS2711A for sweep trace data Yes
Save system setup Save current system setup parameters to EEPROM Yes
Recall system setup Recall system setup parameters from EEPROM Yes
Query system status Queries the MS2711A for current system settings —Trigger self-test Triggers a self-test —Query trace names Returns list of all saved traces —-
WD
Timer?
Yes
25 (19h)
26(1Ah)
27(1Bh)
30 (1Eh)
34(22h)
39 (27h)
40 (28h)
41 (29h)
42 (2Ah)
43 (2Bh)
48 (30h)
50 (32h)
64 (40h)
69 (45h)
Delete sweep trace Delete single or all stored sweep traces Yes
Download sweep trace Downloads a sweep trace to the MS2711A Yes
Query sweep memory Queries percentage of memory available for trace storage ––
Select printer type Select printer type Yes
Set A/B trace Set up A and B trace definitions Yes
Query Power Level Return Power Level at Detector Port —Set Power Monitor Unit Set Power Monitor displaying unit Yes
Set Relative Mode Enable or disable Power Monitor Relative Mode Yes
Set Offset Mode Enable or disable Power Monitor Offset Mode Yes
Set Zero Mode Enable or disable Power Monitor Zeroing Mode Yes
Trigger sweep Starts the next sweep —Check Battery Status Return smart battery status —Auto Save Runtime Setup Automatically save the runtime setup when exiting remote mode —Enter remote mode Enters remote mode at the end of the sweep and returns model number
and firmware version
—-
MS2711A PM 9
Control Byte Summary (2 of 2)
Control
Byte #
70 (46h)
82 (52h)
83 (53h)
84 (54h)
85 (55h)
86 (56h)
87 (57h)
88 (58h)
96 (60h)
97 (61h)
Name Description
Enter remote mode
immediately
Write Antenna Recieves an Antenna via the serial port Yes
Recall Antenna Sends an Antenna via the serial port Yes
Set Field Strength
Measurement
Set Channel Power Enables/disables and defines the channel power measurement Yes
Read Channel Power Returns the result of the channel power measurement Yes
Set Adjacent Channel
Power
Read Adjacent Channel
Power
Measure OCC BW % of
Power
Measure OCC BW dB
Down
Enters remote mode immediately and returns the model number and
firmware version
Enables/disables and defines the field strength measurement Yes
Enables/disables and defines the adjacent channel power measure
ment
Returns the result of the adjacent channel power measurement Yes
Measure OCC BW with % of Power method Yes
Measure OCC BW with dB down method Yes
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WD
Timer?
—-
Yes
99 (63h)
100 (64h)
101 (65h)
102 (66h)
103 (67h)
105 (69h)
106 (6Ah)
107 (6Bh)
108 (6Ch)
109 (6Dh)
110 (6Eh)
111 (6Fh)
112 (70h)
113 (71h)
114 (72h)
118 (76h)
Set Frequency Sets the frequency range Yes
Set Center Freq./Span Sets the center frequency and frequency span Yes
Set Scale Sets the graph boundaries Yes
Set Marker Sets an individual marker Yes
Set Single Limit Set position and on/off status of the single limit line Yes
Set Max Hold Enable or disable Max Hold Yes
Set Resolution Bandwidth Sets the resolution bandwidth Yes
Set Video Bandwidth Sets the video bandwidth Yes
Set Sweep Mode Sets the sweep mode Yes
Set Marker to Peak Sets specified marker to peak measurement Yes
Set Marker to Center Sets the specified marker to the center frequency Yes
Set Attenuation Sets the attenuation for the Spectrum Analyzer Yes
Set AM/FM Demodulation Sets the AM/FM demodulation state, type, and volume Yes
Set Multiple Limit Sets the postion and status of a limit segment Yes
Set Return Sweep Time Enables/disables returning the current sweep time Yes
Set Sweep Averaging Sets the number of sweeps to average Yes
255 (FFh)
Exit remote mode End serial communications —-
10 MS2711A PM
Control Byte Descriptions
Setup system - Control byte #1 (01h)
Description: Sets system status flags and switches. The MS2711A acts on the entire byte. You must ac
count for the state of each of the bits. For example, if you wanted to turn the LCD backlight on without dis
turbing the other switches you would query the Spectrum Analyzer with control byte #20. You would then
mask in the LCD status with the data from response bytes #246 and #250 and send this to the Spectrum An
alyzer after control byte #1.
If coupling is set to automatic, the following values are linked:
RBW to span
VBW to RBW
Attenuation to reference level
See control byte #20 (14h) response bytes #246 and #250 for current MS2711Aconfiguration.
Bytes to Follow: 1 byte
1) Status byte (bit data – LSB = 0)
bit 0 = RBW Coupling (to span) (1 = auto, 0 = manual)
bit 1 = VBW Coupling (to RBW) (1 = auto, 0 = manual)
bit 2 = LCD Back Light On/Off
bit 3-4 = Amplitude units (00 = dBm, 01 = dBV, 10 = dBmV, 11 = dBmV)
bit 5-6 = Detection algorithm (00 = positive peak, 01 = average, 10 = negative peak)
bit 7 = Attenuation Coupling (to ref level) (1 = auto, 0 = manual)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
238 (EEh) Time-out Error
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Select Measurement mode - Control Byte #3 (03h)
Description: Sets measurement mode of the MS2711A.
See control byte #20 (14h) response byte 1 (01h) for current Spectrum Analyzer measurement mode.
Bytes to Follow: 1 byte
1) Measurement Mode
20h = Tracking Generator Mode
30h = Spectrum Analyzer Mode
40h = Power Monitor Mode
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid Measurement Mode
238 (EEh) Time-out Error
MS2711A PM 11
Read time/date - Control Byte #7 (07h)
Descripton: Reads the time and date from the real time clock.
This Time/Date is stamped into all stored sweeps (for users’ reference). The real time clock time and date can
be set by using control byte #8 (08h).
Bytes to Follow: None
Spectrum Analyzer Returns: 7 bytes
1) Hour
2) Minute
3) Month
4) Day
5) Year (Higher Byte)
6) Year (Lower Byte)
7) Daylight Savings (ON/~OFF)
Set time/date - Control Byte #8 (08h)
Description: Sets the real-time clock.
The current Time/Date is stamped into all stored sweeps (for users’ reference). Current time and date can be
found by using control byte #7 (07h).
Bytes to Follow: 7 bytes
1) Hour
2) Minute
3) Month
4) Day
5) Year (Higher Byte)
6) Year (Lower Byte)
7) Daylight Savings (ON/~OFF)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
238 (EEh) Time-out Error
Set reference number - Control Byte #9 (09h)
Description: Stores a Reference Number with the sweep trace. You determine the format.
Current reference number is found in trace 0 response bytes 39 to 54 (27h to 36h).
Bytes to Follow: 16 bytes (ASCII text string)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
238 (EEh) Time-out Error
12 MS2711A PM
Serial port echo On/Off - Control Byte #10 (0Ah)
Description: Sets the serial port echo mode On/Off.
Serial Port Echo Mode uses the single sweep mode (see control byte #108 (6Ch)). Therefore, at the end of
each sweep cycle, the Spectrum Analyzer sends a Sweep Complete Byte #192 (C0h) to the serial port.
This mode activates once the MS2711Aexits from the remote mode. Serial Port Echo status can’t be saved to
or recalled from saved setups. Cycling power resets the Serial port echo status to Off.
The Serial Port Echo Mode allows run-time handshaking between the MS2711Aand computer by doing the
following ...
1) Enter remote mode. Set Serial Port Echo Mode On. Exit remote mode.
2) The Spectrum Analyzer sweeps once and then sends the Sweep Complete Byte.
3) After you receive it, enter remote mode. Recall sweep 0 (last sweep trace in RAM).
4) Exit remote mode. Send Sweep Triggering Byte #48 (30h) and wait for the next sweep cycle.
5) Repeat steps 2-4.
Bytes to Follow: 1 byte
1) Serial Port Echo Status
00h = Off
01h=On
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid serial port echo status
238 (EEh) Time-out Error
Watch-dog timer On/Off - Control Byte #12 (0Ch)
Description: Enables or Disables the Watch-dog timer.
The MS2711Aincorporates a Watch-dog Timer for higher reliability in serial communication. In selected con
trol bytes (see control byte summary), the Spectrum Analyzer checks for the time interval between each byte
received from the computer. If the time interval exceeds the set time limit (0.5 sec), the Spectrum Anlyzer
notifies the computer by sending Time-out Byte #238 (EEh). The MS2711A discards the data it just received
and then waits for the next control byte sequence.
Bytes to Follow: 1 byte
1) Watch-dog timer On/Off
0 = Off
1=On
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid watch-dog timer status
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MS2711A PM 13
Store sweep trace - Control Byte #16 (10h)
Description: Saves current trace.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 5 bytes
1-4) Time/Date Stamp (In long integer format)
5) Operation result: 255 (FFh) Operation Complete Byte
224 (E0h) Out of Memory (Memory Full)
238 (EEh) Time-out Error
Recall sweep trace - Control Byte #17 (11h)
Description: Queries the MS2711Afor sweep trace data.
Bytes to Follow: 1 byte
0 - Last sweep trace before entering remote mode (sweep trace in RAM)
1 - 200 = Specific saved sweep number (stored sweeps in Flash memory)
Spectrum Analyzer Returns:
1-2) # of following bytes (1908 for a valid sweep)
3-4) Reserved bytes
5-11) Model Number (7 bytes in ASCII)
12-15) Software Version (4 bytes in ASCII)
16) Measurement Mode
17-20) Time/Date (in Long Integer)
21-30) Date in String Format (mm/dd/yyyy)
31-38) Time in String Format (hh:mm:ss)
39-54) Reference number stamp
55-56) # data points
57) Start Frequency (highest byte)
58) Start Frequency
59) Start Frequency
60) Start Frequency (lowest byte)
61) Stop Frequency (highest byte)
62) Stop Frequency
63) Stop Frequency
64) Stop Frequency (lowest byte)
65) Center Frequency (highest byte)
66) Center Frequency
67) Center Frequency
68) Center Frequency (lowest byte)
69) Frequency Span (highest byte)
70) Frequency Span
71) Frequency Span
72) Frequency Span (lowest byte)
73) Minimum Frequency Step Size (highest byte)
74) Minimum Frequency Step Size
14 MS2711A PM
75) Minimum Frequency Step Size
76) Minimum Frequency Step Size (lowest byte)
77) Ref Level (highest byte)
78) Ref Level
79) Ref Level
80) Ref Level (lowest byte)
81) Scale per div (highest byte)
82) Scale per div
83) Scale per div
84) Scale per div (lowest byte)
85) Frequency Marker 1 (higher byte)
86) Frequency Marker 1 (lower byte)
87) Frequency Marker 2 (higher byte)
88) Frequency Marker 2 (lower byte)
89) Frequency Marker 3 (higher byte)
90) Frequency Marker 3 (lower byte)
91) Frequency Marker 4 (higher byte)
92) Frequency Marker 4 (lower byte)
93) Single Limit (highest byte)
94) Single Limit
95) Single Limit
96) Single Limit (lowest byte)
97) Multiple Upper Limit 1 Start X (higher byte)
98) Multiple Upper Limit 1 Start X
99) Multiple Upper Limit 1 Start X
100) Multiple Upper Limit 1 Start X (lower byte)
101) Multiple Upper Limit 1 Start Y (higher byte)
102) Multiple Upper Limit 1 Start Y
103) Multiple Upper Limit 1 Start Y
104) Multiple Upper Limit 1 Start Y (lower byte)
105) Multiple Upper Limit 1 End X (higher byte)
106) Multiple Upper Limit 1 End X
107) Multiple Upper Limit 1 End X
108) Multiple Upper Limit 1 End X (lower byte)
109) Multiple Upper Limit 1 End Y (higher byte)
110) Multiple Upper Limit 1 End Y
111) Multiple Upper Limit 1 End Y
112) Multiple Upper Limit 1 End Y (lower byte)
113 - 256) Multiple Upper Limits 2-5, Multiple Lower Limits 1-5
257) RBW Setting (highest byte)
258) RBW Setting
259) RBW Setting
260) RBW Setting (lowest byte)
261) VBW Setting (highest byte)
262) VBW Setting
263) VBW Setting
264) VBW Setting (lowest byte)
265) OCC BW Method
266) OCC BW % Value (highest byte)
267) OCC BW % Value
268) OCC BW % Value
269) OCC BW % Value (lowest byte)
270) OCC BW dBc (highest byte)
271) OCC BW dBc
MS2711A PM 15
272) OCC BW dBc
273) OCC BW dBc (lowest byte)
274) Attenuation (highest byte)
275) Attenuation
276) Attenuation
277) Attenuation (Lowest byte)
278-293) Antenna Name (16 bytes in ASCII)
294) Status byte 1: (0 = Off,1=On)
(LSB) bit 0 : Marker 1 On/Off
bit 1 : Marker 2 On/Off
bit 2 : Marker 3 On/Off
bit 3 : Marker 4 On/Off
bit 4-7 : Not Used
295) Status byte2:(0=Off, 1 = On)
(LSB) bit 0 : Not Used
bit 1 : Marker 2 Delta On/Off
bit 2 : Marker 3 Delta On/Off
bit 3 : Marker 4 Delta On/Off
bit 4-7 : Not Used
296) Status byte3:(0=Off, 1 = On)
(LSB) bit 0 : Antenna Factor Correction On/Off
bits 1-2 : Detection alg. (00 = positive peak, 01 = average, 10 = negative peak)
bits 3-4 : Amplitude Units (00 = dBm, 01 = dBV, 10 = dbmV, 11 = dBmV)
bits 5-7 : Not Used
297) Status byte 4 (0 = Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Limit Type (0 = Single, 1 = Multiple)
bit 1 : Unused
bit 2 : Single Limit On/Off
bit 3 : Single Limit Beep Level (0 = beep when data is below line, 1 = above)
bit 4 : Multiple Limit Upper Segment 1 Status On/Off
bit 5 : Multiple Limit Upper Segment 1 Beep Level Above/Below
bit 6 : Multiple Limit Upper Segment 2 Status On/Off
bit 7 : Multiple Limit Upper Segment 2 Beep Level Above/Below
298) Status byte 5 (0 = Off/Beep if data is below line, 1 = On/Beep if data is ab ove line)
(LSB) bit 0 : Multiple Limit Upper Segment 3 Status On/Off
bit 1 : Multiple Limit Upper Segment 3 Beep Level Above/Below
bit 2 : Multiple Limit Upper Segment 4 Status On/Off
bit 3 : Multiple Limit Upper Segment 4 Beep Level Above/Below
bit 4 : Multiple Limit Upper Segment 5 Status On/Off
bit 5 : Multiple Limit Upper Segment 5 Beep Level Above/Below
bit 6 : Multiple Limit Lower Segment 1 Status On/Off
bit 7 : Multiple Limit Lower Segment 1 Beep Level Above/Below
299) Status byte 6 (0 = Off/Beep if data is below line, 1 = On/Beep if data is ab ove line)
(LSB) bit 0 : Multiple Limit Lower Segment 2 Status On/Off
bit 1 : Multiple Limit Lower Segment 2 Beep Level Above/Below
bit 2 : Multiple Limit Lower Segment 3 Status On/Off
bit 3 : Multiple Limit Lower Segment 3 Beep Level Above/Below
bit 4 : Multiple Limit Lower Segment 4 Status On/Off
bit 5 : Multiple Limit Lower Segment 4 Beep Level Above/Below
bit 6 : Multiple Limit Lower Segment 5 Status On/Off
bit 7 : Multiple Limit Lower Segment 5 Beep Level Above/Below
16 MS2711A PM
300) Status byte 7
(LSB) bits 0-6: Number of Sweeps to Average (1-25, 1 implies no averaging)
bit 7: Reserved
301-310) Reserved
311-1910) Sweep Data (400 points * 4 bytes/point = 1600 bytes)
4 bytes for each data point
1. dBm MSB
2. dBm
3. dBm
4. dBm LSB
For invalid sweeps(empty stored sweep locations): only 12 bytes will return:
1-2) Number of following bytes (10 bytes for invalid sweep recall)
3-4) Model # (unsigned integer, 0x0A for MS2711A)
5-12) Extended Model # (8 bytes in ASCII)
Invalid sweep location: 1 byte
224 (E0) : Parameter error : Invalid sweep location
Notes: Please refer to Control Bytes 64h through 67h for data formats.
Minimum Frequency Step Size is in Hz.
Save system setup - Control Byte #18 (12h)
Description: Saves current system setup parameters to a specific setup store location.
The MS2711Asaves all parameters described in System Status Query - Control Byte #20 (14h) to the speci-
fied store location. Store location 0 is the run-time setup of the MS2711A. It holds the power-on defaults of
the MS2711A.
Bytes to Follow: 1 byte
1) Location to save system setup parameters,0-10
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid store location
238 (EEh) Time-out Error
Recall system setup - Control Byte #19 (13h)
Description: Recalls system setup parameters from a specific store location.
The MS2711Arecalls all parameters described in System Status Query (14h) (except Serial Port Echo Sta
tus) from the specified store location. The recalled setup does not automatically become the default setup
when exiting remote.
You may want to save the recalled setup as the run-time setup by saving it to setup location 0 (which holds
the power-on defaults). See control byte #18 (12h) for details.
-
Bytes to Follow: 1 byte
1) Location to recall system setup parameters from:
0 = Run-time setup
MS2711A PM 17
1 - 10 = Saved setups
255 = Default setup
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid store location
238 (EEh) Time-out Error
Query system status - Control Byte #20 (14h)
Description: Queries the MS2711A for current system settings.
The current state of the Spectrum Analyzer represents the state after last successful remote control opera
tion.
Note: Please refer to Control Bytes 64h through 67h for data formats.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 260 bytes
1) Measurement Mode
2) Data Points (higher byte)
3) Data Points (lower byte)
4) Start Frequency (highest byte)
5) Start Frequency
6) Start Frequency
7) Start Frequency (lowest byte)
8) Stop Frequency (highest byte)
9) Stop Frequency
10) Stop Frequency
11) Stop Frequency (lowest byte)
12) Center Frequency (highest byte)
13) Center Frequency
14) Center Frequency
15) Center Frequency (lowest byte)
16) Frequency Span (highest byte)
17) Frequency Span
18) Frequency Span
19) Frequency Span (lowest byte)
20) Minimum Frequency Step Size (highest byte)
21) Minimum Frequency Step Size
22) Minimum Frequency Step Size
23) Minimum Frequency Step Size (lowest byte)
24) Ref Level (highest byte)
25) Ref Level
26) Ref Level
27) Ref Level (lowest byte)
28) Scale per div (highest byte)
29) Scale per div
30) Scale per div
31) Scale per div (lowest byte)
32) Frequency Marker 1 (higher byte)
33) Frequency Marker 1 (lower byte)
-
18 MS2711A PM
34) Frequency Marker 2 (higher byte)
35) Frequency Marker 2 (lower byte)
36) Frequency Marker 3 (higher byte)
37) Frequency Marker 3 (lower byte)
38) Frequency Marker 4 (higher byte)
39) Frequency Marker 4 (lower byte)
40) Single Limit (highest byte)
41) Single Limit
42) Single Limit
43) Single Limit (lowest byte)
44) Multiple Upper Limit 1 Start X (higher byte)
45) Multiple Upper Limit 1 Start X
46) Multiple Upper Limit 1 Start X
47) Multiple Upper Limit 1 Start X (lower byte)
48) Multiple Upper Limit 1 Start Y (higher byte)
49) Multiple Upper Limit 1 Start Y
50) Multiple Upper Limit 1 Start Y
51) Multiple Upper Limit 1 Start Y (lower byte)
52) Multiple Upper Limit 1 End X (higher byte)
53) Multiple Upper Limit 1 End X
54) Multiple Upper Limit 1 End X
55) Multiple Upper Limit 1 End X (lower byte)
56) Multiple Upper Limit 1 End Y (higher byte)
57) Multiple Upper Limit 1 End Y
58) Multiple Upper Limit 1 End Y
59) Multiple Upper Limit 1 End Y (lower byte)
60-203) Multiple Upper Limits 2-5, Multiple Lower Limits 1-5
204) RBW Setting (highest byte)
205) RBW Setting
206) RBW Setting
207) RBW Setting (lowest byte)
208) VBW Setting (highest byte)
209) VBW Setting
210) VBW Setting
211) VBW Setting (lowest byte)
212) OCC BW Method
213) OCC BW % Value (highest byte)
214) OCC BW % Value
215) OCC BW % Value
216) OCC BW % Value (lowest byte)
217) OCC BW dBc (highest byte)
218) OCC BW dBc
219) OCC BW dBc
220) OCC BW dBc (lowest byte)
221) Attenuation (highest byte)
222) Attenuation
223) Attenuation
224) Attenuation (lowest byte)
225) Antenna Index
226-241) Antenna Name (16 bytes in ASCII)
242) AM/FM Demod Type (0 = FM-Wide Band,1=FMNarrow Band,2=AM)
243) AM/FM Demod Volume (0 = min, 255 = max)
244) Status byte1:(0=Off, 1 = On)
(LSB) bit 0 : Marker 1 On/Off
MS2711A PM 19
bit 1 : Marker 2 On/Off
bit 2 : Marker 3 On/Off
bit 3 : Marker 4 On/Off
bit 4-7 : Not Used
245) Status byte2:(0=Off, 1 = On)
(LSB) bit 0 : Not Used
bit 1 : Marker 2 Delta On/Off
bit 2 : Marker 3 Delta On/Off
bit 3 : Marker 4 Delta On/Off
bit 4-7 : Not Used
246) Status byte3:(0=Off, 1 = On)
(LSB) bit 0 : Antenna Factors Correction On/Off
bit 1 : AM/FM Demod Status On/Off
bit 2 : Spectrum Analyzer Cal Status On/Off
bit 3-4 : Amplitude Units (00 = dBm, 01 = dBV, 10 = dBmV, 11 = dbmV)
bit 5-6 : Detection Alg. (00 = positive peak, 01 = average, 10 = negative peak)
bit 7 : LCD Back Light On/Off
247) Status byte4:(0=Off, 1 = On)
(LSB) bit 0 : Limit Type (0 = Single, 1 = Multiple)
bit 1 : Limit Beep On/Off
bit 2 : Single Limit Status On/Off
bit 3 : Single Limit Beep Level(0=beep when data below line, 1 = above)
bit 4 : Multiple Limit Upper Segment 1 Status On/Off
bit 5 : Multiple Limit Upper Segment 1 Beep Level Above/Below
bit 6 : Multiple Limit Upper Segment 2 Status On/Off
bit 7 : Multiple Limit Upper Segment 2 Beep Level Above/Below
248) Status byte5:(0=Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Multiple Limit Upper Segment 3 Status On/Off
bit 1 : Multiple Limit Upper Segment 3 Beep Level Above/Below
bit 2 : Multiple Limit Upper Segment 4 Status On/Off
bit 3 : Multiple Limit Upper Segment 4 Beep Level Above/Below
bit 4 : Multiple Limit Upper Segment 5 Status On/Off
bit 5 : Multiple Limit Upper Segment 5 Beep Level Above/Below
bit 6 : Multiple Limit Lower Segment 1 Status On/Off
bit 7 : Multiple Limit Lower Segment 1 Beep Level Above/Below
249) Status byte6:(0=Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Multiple Limit Lower Segment 2 Status On/Off
bit 1 : Multiple Limit Lower Segment 2 Beep Level Above/Below
bit 2 : Multiple Limit Lower Segment 3 Status On/Off
bit 3 : Multiple Limit Lower Segment 3 Beep Level Above/Below
bit 4 : Multiple Limit Lower Segment 4 Status On/Off
bit 5 : Multiple Limit Lower Segment 4 Beep Level Above/Below
bit 6 : Multiple Limit Lower Segment 5 Status On/Off
bit 7 : Multiple Limit Lower Segment 5 Beep Level Above/Below
250) Status byte7:(0=On,1=Off)
(LSB) bit 0 : Serial Port Echo Status On/Off
bit 1 : Return Sweep Time On/Off
bit 2 : RBW Coupling (1 = auto, 0 = manual)
bit 3 : VBW Coupling (1 = auto, 0 = manual)
bit 4 : Attenuation Coupling (1 = auto, 0 = manual)
bit 5-7 : Not Used
251) Printer Type
252) Trace A/B Status
(LSB) bit 0-1 : Trace A (00 = A only, 01 = A – B, 10 = A + B)
20 MS2711A PM
bit2:Trace B On/Off
bit 3-7 : Not Used
253) Trace B Trace ID (0 = previous data, 1-200 = saved trace id, 255 = none)
254) Status Byte 8
(LSB) bits 0-6 : Number of Sweeps to Average (1-25, 1 implies no averaging)
bit 7 : Reserved
255-260) Currently Unused
Trigger self-test - Control Byte #21 (15h)
Description: Triggers a self test on the MS2711A.
Bytes to Follow: 0 Bytes
Spectrum Analyzer Returns: 8 bytes
1) Self-test report: (0 = Fail, 1 = Pass)
(LSB) bit 0 : Battery
bit1:Temperature
bit 2 : EEPROM read/write
bit 3-7 : Not currently used
2) Self-test report: (0 = Fail, 1 = Pass)
(LSB) bit 0 : Spectrum Analyzer Lock
bit 1- 7 : Unused
3) Battery Voltage(higher byte)
4) Battery Voltage(lower byte)
5) Temperature (higher byte)
6) Temperature (lower byte)
7) Spectrum Analyzer Lock Fail Counter (higher byte)
8) Spectrum Analyzer Lock Fail Counter (lower byte)
Notes: Battery Voltage in 1/10th of a Volt (e.g. 124 = 12.4 Volts)
Temperature in 1/10th of degree Celsius (e.g. 362 = 36.2 °C)
Query Trace Names - Control Byte #24 (18h)
Description: Returns a list of all saved traces.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 2+41´ number of saved traces
1-2) # of saved traces
for each trace:
1-2) Trace Index
3) Measurement Mode (refer to Control Byte #3)
4-21) Date/Time in string format (“MM/DD/YYYYHH:MM:SS”)
22-25) Date/Time as Unsigned Long Integer
26-41) Trace Name (16 bytes)
21 MS2711A PM
Delete Sweep Trace - Control Byte #25 (19h)
Description: Delete single or all stored sweep traces in MS2711A.
Bytes to Follow: 1 byte
0 - Delete all Traces
X - Delete Single Trace #X
Spectrum Analyzer Returns: 225 (FFh) Operation Complete Byte
Download Sweep Trace - Control Byte #26 (1Ah)
Description: Downloads a sweep trace to the MS2711A.
Bytes to Follow: 1890 bytes
1-2) # of following bytes
3) Measurement Mode
4-7) Time/Date (in Long Integer)
8-17) Date in String Format (mm/dd/yyyy)
18-25) Time in String Format (hh:mm:ss)
26-41) Reference number stamp
42-43) # of data points
44) Start Frequency (highest byte)
45) Start Frequency
46) Start Frequency
47) Start Frequency (lowest byte)
48) Stop Frequency (highest byte)
49) Stop Frequency
50) Stop Frequency
51) Stop Frequency (lowest byte)
52) Center Frequency (highest byte)
53) Center Frequency
54) Center Frequency
55) Center Frequency (lowest byte)
56) Frequency Span (highest byte)
57) Frequency Span
58) Frequency Span
59) Frequency Span (lowest byte)
60) Ref Level (highest byte)
61) Ref Level
62) Ref Level
63) Ref Level (lowest byte)
64) Scale per div (highest byte)
65) Scale per div
66) Scale per div
67) Scale per div (lowest byte)
68) Frequency Marker 1 (higher byte)
69) Frequency Marker 1 (lower byte)
22 MS2711A PM
70) Frequency Marker 2 (higher byte)
71) Frequency Marker 2 (lower byte)
72) Frequency Marker 3 (higher byte)
73) Frequency Marker 3 (lower byte)
74) Frequency Marker 4 (higher byte)
75) Frequency Marker 4 (lower byte)
76) Single Limit (highest byte)
77) Single Limit
78) Single Limit
79) Single Limit (lowest byte)
80) Multiple Upper Limit 1 Start X (higher byte)
81) Multiple Upper Limit 1 Start X
82) Multiple Upper Limit 1 Start X
83) Multiple Upper Limit 1 Start X (lower byte)
84) Multiple Upper Limit 1 Start Y (higher byte)
85) Multiple Upper Limit 1 Start Y
86) Multiple Upper Limit 1 Start Y
87) Multiple Upper Limit 1 Start Y (lower byte)
88) Multiple Upper Limit 1 End X (higher byte)
89) Multiple Upper Limit 1 End X
90) Multiple Upper Limit 1 End X
91) Multiple Upper Limit 1 End X (lower byte)
92) Multiple Upper Limit 1 End Y (higher byte)
93) Multiple Upper Limit 1 End Y
94) Multiple Upper Limit 1 End Y
95) Multiple Upper Limit 1 End Y (lower byte)
96-239) Multiple Upper Limits 2-5, Multiple Lower Limits 1-5
240) RBW Setting (highest byte)
241) RBW Setting
242) RBW Setting
243) RBW Setting (lowest byte)
244) VBW Setting (highest byte)
245) VBW Setting
246) VBW Setting
247) VBW Setting (lowest byte)
248) OCC BW Method
249) OCC BW % Value (highest byte)
250) OCC BW % Value
251) OCC BW % Value
252) OCC BW % Value (lowest byte)
253) OCC BW dBc (highest byte)
254) OCC BW dBc
255) OCC BW dBc
256) OCC BW dBc (lowest byte)
257) Attenuation (highest byte)
258) Attenuation
259) Attenuation
260) Attenuation (lowest byte)
261-276) Antenna Name (16 bytes in ASCII)
277) Status byte1:(0=Off, 1 = On)
(LSB) bit 0 : Marker 1 On/Off
bit 1 : Marker 2 On/Off
bit 2 : Marker 3 On/Off
bit 3 : Marker 4 On/Off
MS2711A PM 23
bit 4-7 : Not Used
278) Status byte2:(0=Off, 1 = On)
(LSB) bit 0 : Not Used
bit 1 : Marker 2 Delta On/Off
bit 2 : Marker 3 Delta On/Off
bit 3 : Marker 4 Delta On/Off
bit 4-7 : Not Used
279) Status byte3:(0=Off, 1 = On)
(LSB) bit 0 : Antenna Factors Correction On/Off
bit 1-2 : Detection Alg. (00 = positive peak, 01 = average, 10 = negative peak)
bit 3-4 : Amplitude Units (00 = dBm, 01 = dBV, 10 = dBmV, 11 = dBmV)
bit 5-7 : Not Used
280) Status byte4:(0=Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Limit Type (0 = Single, 1 = Multiple)
bit 1 : Single Limit On/Off
bit 2 : Single Limit Beep Level(0=beep when data below line, 1 = above)
bit 3 : Multiple Limit Upper Segment 1 Status On/Off
bit 4 : Multiple Limit Upper Segment 1 Beep Level Above/Below
bit 5 : Multiple Limit Upper Segment 2 Status On/Off
bit 6 : Multiple Limit Upper Segment 2 Beep Level Above/Below
bit 7 : Multiple Limit Upper Segment 3 Status On/Off
281) Status byte5:(0=Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Multiple Limit Upper Segment 3 Beep Level Above/Below
bit 1 : Multiple Limit Upper Segment 4 Status On/Off
bit 2 : Multiple Limit Upper Segment 4 Beep Level Above/Below
bit 3 : Multiple Limit Upper Segment 5 Status On/Off
bit 4 : Multiple Limit Upper Segment 5 Beep Level Above/Below
bit 5 : Multiple Limit Lower Segment 1 Status On/Off
bit 6 : Multiple Limit Lower Segment 1 Beep Level Above/Below
bit 7 : Multiple Limit Lower Segment 2 Status On/Off
282) Status byte6:(0=Off/Beep if data is below line, 1 = On/Beep if data is above line)
(LSB) bit 0 : Multiple Limit Lower Segment 2 Beep Level Above/Below
bit 1 : Multiple Limit Lower Segment 3 Status On/Off
bit 2 : Multiple Limit Lower Segment 3 Beep Level Above/Below
bit 3 : Multiple Limit Lower Segment 4 Status On/Off
bit 4 : Multiple Limit Lower Segment 4 Beep Level Above/Below
bit 5 : Multiple Limit Lower Segment 5 Status On/Off
bit 6 : Multiple Limit Lower Segment 5 Beep Level Above/Below
bit 7 : Not Used
283) Status byte 7
(LSB) bits 0-6 : Number of Sweeps to Average (1-25, 1 implies no averaging)
bit 7 : Reserved
284-290) Reserved
291-1890) Sweep Data (400 points * 4 bytes/point = 1600 bytes)
4 bytes for each data point
1. dBm MSB
2. dBm
3. dBm
4. dBm LSB
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Not enough bytes transferred
225 (E1h) Memory Error : Not enough memory in to store data
238 (EEh) Time-out Error
24 MS2711A PM
Query Sweep Memory - Control Byte #27 (1Bh)
Description: Queries MS2711Afor percentage of memory that is available for trace storage.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 1byte-%ofmemory currently used (0 to 100)
Select Printer Type - Control Byte #30 (1Eh)
Description: Select Printer Type
Bytes to Follow: 1 byte
0 - Epson Stylus Models
1 - Epson LQ Models
2 - Citizen PN Models
3 - NEC Superscript Models
4 - NEC Silent Writer Models
5 - Seiko DPU 411, 414
6 - Cannon BJC 50
7 - Cannon BJC 80
8 - Cannon BJC 250
9 - Cannon BJC 4400
10 - HP Deskjet 340
11 - HP Deskjet 500 Series
12 - HP Deskjet 600 Series
13 - HP Deskjet 800 Series
14 - HP Deskjet 1120C
15 - HP Laserjet 6L, 6P, 4000
16 - Epson ESC/P compatible
17 - Epson ESC/P2 compatible
18 - Epson ESC/P Raster compatible
19 - HP PCL3 compatible
Spectrum Analyzer Returns: 225 (FFh) Operation Complete Byte
Select A/B Trace - Control Byte #34 (22h)
Description: Set up A and B trace definitions.
Bytes to Follow: 3 bytes
1) “A” trace display (0 = A only,1=A–B,2=A+B)
2) “B” trace status (0 = OFF,1=ON)
3) “B” trace number
0 = save current “A” data into “B” buffer, use that as “B”
1-200 = trace number
MS2711A PM 25
255 = no “B” trace defined
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Not enough bytes transferred, “B” trace
requested to be used in calculations or displayed, but no trace or
invalid trace specified
238 (EEh) Time-out Error
Query Power Level - Control Byte #39 (27h)
Description: Return Power Level at Detector Port
This control byte contains all the information you need to determine just about anything about a power mon
itor measurement.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 21 bytes
1) Status Byte
(LSB) bit 0 : Unit (0 - Watt/%, 1 - dBm/dBr)
bit 2 : Relative Mode On/~Off
bit 3 : Offset Mode On/~Off
bit 4 : Zero Mode On/~Off
bit 5-7: Not currently used.
2-5) Relative Mode Reference Power Level in dBm
6-9) Offset Mode Offset in dB
10-13) Zero Mode Power Level in dBm
14-17) Absolute Power Level in dBm
18-21) Power in dBm/dBr
-
Notes: You can query power level without setting power monitor mode ON.
Absolute Power of –100 indicates a hardware failure (Power monitor mode unavailable or
RF Detector not connected)
Power is in one-thousandth of dBm
Relative power is in one-thousandth of dBr
Offset is in one-thousandth of dB
Set Power Monitor Unit - Control Byte #40 (28h)
Description: Set Power Monitor unit to Watts or dBm
Bytes to Follow: 1 byte
00h = Watt (% if in relative mode)
01h = dBm (dBr if in relative mode)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid power monitor unit
238 (EEh) Time-out Error
26 MS2711A PM
Relative Mode On/Off - Control Byte #41 (29h)
Description: Enable or disable Power Monitor Relative Mode
Bytes to Follow: 1 byte
00h = Off
01h = On w/ trigger (use the current power level as a reference power level.)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
Offset Mode On/Off - Control Byte #42 (2Ah)
Description: Enable or disable Power Monitor Offset Mode
Bytes to Follow: 5 bytes
1) On/~Off (01 = On, 00 = Off)
2-5) Offset Power Level in dB
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Note: If you turn the Offset mode off, you must still send the other bytes. Bytes2-5will be ignored.
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
Zero Mode On/Off - Control Byte #43 (2Bh)
Description: Enable or disable Power Monitor Zeroing Mode.
Bytes to Follow: 1 byte
00h = Off
01h = On w/ trigger(current power level is referenced as –80 dBm.)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
MS2711A PM 27
Trigger sweep - Control Byte #48 (30h)
Description: Causes the MS2711A to perform a sweep if it is in single sweep or serial port echo mode.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: Sweep Complete Byte # 192 (C0h)
Note: If the Spectrum Analyzer is not in single sweep or serial port echo mode, sending the byte does noth
ing. This command is for local mode operation. If the Spectrum Analyzer is in remote mode, sending
the byte does nothing.
Check Battery Status - Control Byte #50 (32h)
Description: Returns smart battery status.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 17 bytes
1-2) Battery Status flags (Refer to Smart Battery Data Spec 5.1.2.1)
3-4) State of Charge (unsigned integer 0 to 100(%) Full)
5-6) Battery Voltage (unsigned integer 0 to 65535 in mV)
7-8) Battery Current (signed integer –32,768 to +32,7687 mA, positive = Charging)
9-10) Battery Average Current (signed integer –32,768 to +32,7687 mA, positive = Charging)
11-12) Average time to empty (unsigned integer 0 to 65535 minute)
13-14) Battery Charge Cycle Count (unsigned integer 0 to 65535 cycles)
15-16) Battery Capacity at Full Charge in mA Hours (unsigned integer 0 to 65535 cycles)
17) Unit under battery power (1 = Yes,0=No)
-
Automatically Save Runtime Setup - Control Byte #64 (40h)
Description: Automatically save the runtime setup when exiting remote mode.
This flag must be set once per power cycle of the Spectrum Analyzer. It returns to its default when the unit
is turned off. The default is (0), Do Not automatically save the runtime setup.
Bytes to Follow: 1 byte
1) Save runtime setup On/Off
0 = Off
1=On
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
238 (EEh) Time-out Error
28 MS2711A PM
Enter remote mode - Control Byte #69 (45h)
Description: Enter remote mode then send model number and firmware version to the computer
Bytes to Follow: 0 byte
Spectrum Analyzer Returns: 13 bytes
1-2) Model # (unsigned integer, 0x0A for MS2711A)
3-9) Extended Model # (7 bytes in ASCII)
10-13) Software Version - 4 bytes (ASCII)
The computer sends Enter Remote mode byte #69 (45h) to the MS2711Aand waits for response.
Since the Spectrum Analyzer polls its serial port buffer at the end of each sweep, the computer must wait
until the Spectrum Analyzer sends the return bytes before sending a new control byte. Otherwise, the new
control byte overwrites the old one (saying enter remote) and the analyzer does not respond as expected.
Once in remote mode, the Spectrum Analyzer stops sweeping. A Remote Mode Indicator appears on the
LCD.
The MS2711Asends its model and software version numbers to the computer. The Spectrum Analyzer is now
able to take multiple control bytes. It waits for the next control byte.
Enter Remote Mode Immediately - Control Byte #70 (46h)
Description: Enter remote mode in the middle of a sweep, then send the model number and firmware version ot the computer.
Bytes to Follow: 0 bytes
Spectrum Analyzer Returns: 13 bytes
1-2) Model # (unsigned integer, 0x0A for MS2711A)
3-9) Extended Model # (7 bytes in ASCII)
10-13) Software Version - 4 bytes (ASCII)
The computer sends Enter Remote Mode Immediately byte #70 (46h) to the MS2711Aand waits for a re
sponse. This control byte causes the unit to enter remote mode immediately. Note that this could result in in
complete sweep data. Use control byte #69 if complete data is required.
Once in remote mode, the Spectrum Analyzer stops sweeping. A Remote Mode Indicator appears on the
LCD.
The MS2711Asends its model and software version numbers to the computer. The Spectrum Analyzer is now
able to take multiple control bytes. It waits for the next control byte.
-
-
MS2711A PM 29
Write Antenna - Control Byte #82 (52h)
Description: Receives an Antenna to the MS2711Avia the serial port.
Bytes to Follow: (24 - 378, depending on the number of antenna factors)
1) Antenna List index (1-10)
2-17) Antenna Name (string)
18) Number of Antenna Factors
19-21) Frequency
23-24) Antenna Factor (X multiplier = 100)
Frequency and Antenna Factor are repeated for the number of antenna factors.
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Note: Frequency is specified in 1 Hz steps.
(e.g. 100.3 MHz would be sent as 100030000 = 1,000,300,000 Hz)
224 (E0h) Parameter Error : Not enough bytes transferred
238 (EEh) Time-out Error
Recall Antenna - Control Byte #83 (53h)
Description: Sends an Antenna from the MS2711Avia the serial port.
Bytes to Follow: 1 byte
1) Antenna List index (1-10)
Spectrum Analyzer Returns: (26-380 bytes, depending on the number of antenna factors)
1) Maximum Antenna Number
2-17) Antenna Name (string)
18) Number of Antenna Factors
19-20) Number of Following Bytes
21-24) Frequency
25-26) Antenna Factor (X multipler = 100)
Frequency and Antenna Factor are repeated for the number of antenna factors.
Note: Frequency is specified in 1 Hz steps.
(e.g. 100.3 MHz would be sent as 100030000 = 1,000,300,000 Hz)
30 MS2711A PM
Set Field Strength Measurement - Control Byte #84 (54h)
Description: Sets the state of the measurement (ON or OFF) and the antenna index for the field strength
measurement.
Bytes to Follow: 2 bytes
1) Field Strength Measurement State (On/Off)
2) Antenna List index (1-10)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error: Invalid state or index
238 (EEh) Time-out Error
Set Channel Power - Control Byte #85 (55h)
Description: Sets the state of the measurement (ON or OFF), the center frequency and the span (in Hz).
Send a 0 (zero) following the command to set the channel power measurement in the current
setup.
Send a 1 (one) to set the channel power associated with the trace that was most recently uploaded by command #26, Upload Sweep Trace.
Note that if the channel power measurement is turned ON, all other measurements (field
strength, adjacent channel power, AM/FM demodulation) are turned OFF.
Bytes to Follow: 14 bytes
1) Channel Power Location (0 = current setup, 1 = last uploaded trace)
2) Channel Power Measurement State (On/Off)
3-6) Center Frequency (in Hz)
7-10) Integration Bandwidth (in Hz)
11-14) Span Frequency (in Hz)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error: Invalid parameter value
238 (EEh) Time-out Error
Read Channel Power - Control Byte #86 (56h)
Description: Read the current channel power or the channel power of the last recalled trace.
Send a 0 (zero) following the command to read the current channel power measurement (i.e.
the one that is updated as the unit is sweeping).
Send a 1 (one) to read the channel power associated with the trace that was most recently re
called by command #17, Recall Sweep Trace.
Bytes to Follow: 1 byte
MS2711A PM 31
-
1) Channel Power Location (0 = current measured value, 1 = last recalled trace value)
Spectrum Analyzer Returns: 21 bytes
1) Channel Power On/Off
2-5) Channel Center Frequency (in Hz)
6-9) Integration Bandwidth (in Hz)
10-13) Channel Span Frequency (in Hz)
14-17) Channel Power (= (power in dBm * 1000) + 270000)
18-21) Channel Power Density (= (density in dBm/Hz * 1000) + 270000)
Set Adjacent Channel Power (ACP) - Control Byte #87 (57h)
Description: Sets the state of the measurement (ON or OFF), the center frequency, the main channel band
width, the adjacent channel bandwidth and the channel spacing (in Hz).
Send a 0 (zero) following the command to set the channel power measurement in the current setup.
Send a 1 (one) to set the adjacent channel power associated with the trace that was most recently uploaded
by command #26, Upload Sweep Trace.
Note that if the ACP measurement is turned ON, all other measurements (field strength, channel power,
AM/FM demodulation) are turned OFF.
Bytes to Follow: 18 bytes
1) Adjacent Channel Power Location (0 = current setup, 1 = last uploaded trace)
2) Adjacent Channel Power Measurement State (On/Off)
3-6) Center Frequency (in Hz)
7-10) Main Channel Bandwidth (in Hz)
11-14) Adjacent Channel Bandwidth (in Hz)
15-18) Channel Spacing (in Hz)
-
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error: Invalid parameter value
238 (EEh) Time-out Error
Read Adjacent Channel Power (ACP) - Control Byte #88 (58h)
Description: Read the current adjacent channel power or the adjacent channel power of the last recalled
trace.
Send a 0 (zero) following the command to read the current adjacent channel power measurement (i.e. the one
that is updated as the unit is sweeping).
Send a 1 (one) to read the adjacent channel power associated with the trace that was most recently recalled
by command #17, Recall Sweep Trace.
Bytes to Follow: 1 byte
1) Adjacent Channel Power Location (0 = current measured value, 1 = last recalled trace value)
Spectrum Analyzer Returns: 29 bytes
32 MS2711A PM
1) ACP On/Off
2-5) Main Channel Center Frequency (in Hz)
6-9) Main Channel Bandwidth (in Hz)
10-13) Adjacent Channel Bandwidth (in Hz)
14-17) Channel Spacing (in Hz)
18-21) Main Channel Power (= (power in dBm * 1000) + 270000)
22-25) Lower Adjacent Channel Power (= (power in dBm * 1000) + 270000)
26-29) Upper Adjacent Channel Power (= (power in dBm * 1000) + 270000)
Measure OCC BW % of Power - Control Byte #96 (60h)
Description: Measure OCC BW with % of Power method.
Bytes to Follow: 4 bytes
1) % of Power (highest byte)
2) % of Power
3) % of Power
4) % of Power (lowest byte)
Spectrum Analyzer Returns: 16 bytes
1-4) OCC BW
5-8) Measure % of Power
9-12) Low Frequency OCC BW
13-16) High Frequency OCC BW
Note: In 100
th
of %, 9123 = 91.23%
Measure OCC BW dB Down - Control Byte #97 (63h)
Description: Measure OCC BW with dB down method.
Bytes to Follow: 4 bytes
1) dB down (highest byte)
2) dB down
3) dB down
4) dB down (lowest byte)
Spectrum Analyzer Returns: 16 bytes
1-4) OCC BW
5-8) Measure dB down
9-12) Low Frequency OCC BW
13-16) High Frequency OCC BW
Note: In 100
th
of dB, 1234 = 12.34 dB
MS2711A PM 33
Set Frequency - Control Byte #99 (63h)
Description: Sets the MS2711Afrequency range.
Bytes to Follow: 8 bytes
1) Start Frequency (highest byte)
2) Start Frequency
3) Start Frequency
4) Start Frequency (lowest byte)
5) Stop Frequency (highest byte)
6) Stop Frequency
7) Stop Frequency
8) Stop Frequency (lowest byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Notes: Start and stop frequencies are given in terms of 1 Hz steps.
(e.g. 100.3 MHz would be sent as 100030000 = 1,000,300,000 Hz)
224 (E0h) Parameter Error : Invalid frequency range
238 (EEh) Time-out Error
Set Center Freq./Span - Control Byte #100 (64h)
Description: Sets the MS2711Acenter frequency and frequency span.
Bytes to Follow: 8 bytes
1) Center Frequency (highest byte)
2) Center Frequency
3) Center Frequency
4) Center Frequency (lowest byte)
5) Frequency Span (highest byte)
6) Frequency Span
7) Frequency Span
8) Frequency Span (lowest byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid frequency range
238 (EEh) Time-out Error
Notes: Center frequencies and frequency spans are given in terms of 1 Hz steps.
(e.g. 100.3 MHz would be sent as 100030000 = 1,000,300,000 Hz)
34 MS2711A PM
Set Scale - Control Byte #101 (65h)
Description: Sets the graph boundaries.
Ref Level will be the “top” scale of the graph, and there are a total of 10 divisions, so the bottom scale can be
determined by: Ref Level – 10 ´ dB/div.
Bytes to Follow: 8 bytes
1) Ref Level (highest byte)
2) Ref Level
3) Ref Level
4) Ref Level (lowest byte)
5) dB/div (highest byte)
6) dB/div
7) dB/div
8) dB/div (lowest byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Notes: Parameters are sent in 1000
Ref Level is sent as: (Ref Level) ´ 1000 + 270,000 (0 dB = 270,000, 20 dB = 290,000,
–120 dB = 150,000)
224 (E0h) Parameter Error : Invalid scale range
238 (EEh) Time-out Error
th
of a dB (–12.34 dB = –12340)
Set Marker - Control Byte #102 (66h)
Description: Sets an individual MS2711Amarker.
Bytes to Follow: 5 bytes:
1) Marker Number (01h = marker 1, 02h = marker 2, 03h = marker 3, 04h = marker 4)
2) Marker Line On/~Off (01h = On, 00h = Off)
3) Marker Delta On/~Off (01h = On, 00h = Off)
4) Marker Value (higher byte)
5) Marker Value (lower byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid marker, marker status, or marker
position
238 (EEh) Time-out Error
Note: Marker value is between 0 and 399.
MS2711A PM 35
Set Single Limit - Control Byte #103 (67h)
Description: Sets the position and On/Off Status of the Single Limit Line.
Note that setting the limit ON automatically makes the limit type “SINGLE”.
Bytes to Follow: 7 bytes:
1) Limit Line On/~Off (01h = On, 00h = Off)
2) Limit Beep On/~Off (01h = On, 00h = Off)
3) Beep if Data is Above/Below Limit (01h = Above, 00h = Below)
4) Limit Value (highest byte)
5) Limit Value
6) Limit Value
7) Limit Value (lowest byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Notes: Parameters are sent in 1000
Limit is sent as: (Limit) ´ 1000 + 270,000 (0 dB = 270,000, 20 dB = 290,000,
–120 dB = 150,000)
224 (E0h) Parameter Error : Invalid limit, limit status, or limit value
238 (EEh) Time-out Error
th
of a dB (–12.34 dB = –12340)
Set Max Hold - Control Byte #105 (69h)
Description: Sets the max hold settings on the Spectrum Analyzer.
Bytes to Follow: 1 byte
00h = Max Hold Off
01h = Max Hold On
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
Set Resolution Bandwidth - Control Byte #106 (6Ah)
Description: Set the resolution BW for the Spectrum Analyzer. Automatic control couples the resolution
BW to the span.
Note the setting the RBW using this command automatically sets the RBW coupling to “MANUAL”.
Bytes to Follow: 1 byte
00h = 10 kHz resolution BW
01h = 30 kHz resolution BW
02h = 100 kHz resolution BW
03h = 1 MHz resolution BW
36 MS2711A PM
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
Set Video Bandwidth - Control Byte #107 (6Bh)
Description: Set the video BW for the Spectrum Analyzer. Automatic control couples the video BW to the
resolution BW.
Note that setting the VBW using this command automatically sets the VBW coupling to “MANUAL”.
Bytes to Follow: 1 byte
00h = 100 Hz video BW
01h = 300 Hz video BW
02h = 1 kHz video BW
03h = 3 kHz video BW
04h = 10 kHz video BW
05h = 30 kHz video BW
06h = 100 kHz video BW
07h = 300 kHz video BW
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid parameter
238 (EEh) Time-out Error
Set Sweep Mode - Control Byte #108 (6Ch)
Description: Sets the sweep mode for the Spectrum Analyzer.
Bytes to Follow: 1 byte
00h = Single Sweep
01h = Continuous Sweep
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid mode
238 (EEh) Time-out Error
MS2711A PM 37
Set Marker to Peak - Control Byte #109 (6Dh)
Description: Sets the specified marker to the peak measurement.
Bytes to Follow: 1 byte
Marker to set to peak (1 - 4)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid Marker
238 (EEh) Time-out Error
Set Marker to Center - Control Byte #110 (6Eh)
Description: Sets the specified marker to the center frequency.
Bytes to Follow: 1 byte
Marker to set to center frequency (1 - 4)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid Marker
238 (EEh) Time-out Error
Set Attenuation - Control Byte #111 (6Fh)
Description: Sets the attenuation of the Spectrum Analyzer. Automatic control couples the attenuation to
the reference level.
Note that setting the attenuation using this command automatically sets the attenuation coupling to
“MANUAL”.
Bytes to Follow: 1 byte
00h=0dBattenuation
01h = 10 dB attenuation
02h = 20 dB attenuation
03h = 30 dB attenuation
04h = 40 dB attenuation
05h = 50 dB attenuation
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error
238 (EEh) Time-out Error
38 MS2711A PM
Set AM/FM Demodulation - Control Byte #112 (70h)
Description: Sets the AM/FM demodulation status (ON/OFF), type, and volume.
Bytes to Follow: 3 bytes
1) Demod state (00h = OFF, 01h = ON)
2) Demod type (00h = FM-Wide band, 01h = FM-Narrow band, 02h = AM)
3) Volume (00h = lowest, 01h = highest)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error
238 (EEh) Time-out Error
Set Multiple Limit - Control Byte #113 (71h)
Description: Sets the position and On/Off status of a limit segment.
Note that setting a limit segment ON automatically makes the limit type “MULTIPLE”.
Bytes to Follow: 20 bytes
1) Segment number (1-5)
2) Segment type (00 = lower limit, 01 = upper limit)
3) Limit Line On/~Off (01h = On, 00h = Off)
4) Limit Beep On/Off (01h = On, 00h = Off)
5) Limit Value Start X (highest byte)
6) Limit Value Start X
7) Limit Value Start X
8) Limit Value Start X (lowest byte)
9) Limit Value Start Y (highest byte)
10) Limit Value Start Y
11) Limit Value Start Y
12) Limit Value Start Y (lowest byte)
13) Limit Value End X (highest byte)
14) Limit Value End X
15) Limit Value End X
16) Limit Value End X (lowest byte)
17) Limit Value End Y (highest byte)
18) Limit Value End Y
19) Limit Value End Y
20) Limit Value End Y (lowest byte)
Spectrum Analyzer Returns: 255 (FFh) Operation Complete Byte
Notes: Limits (Y values) are sent as 1000
Limit Y is sent as: (Limit Y) ´ 1000 + 270,000 (0 dB = 270,000, 20 dB = 290,000,
–120 dB = 150,000)
Frequencies (X values) are given in terms of 1 Hz steps.
224 (E0h) Parameter Error : Invalid limit, limit status, or limit value
238 (EEh) Time-out Error
th
of a dB (–12.34 dB = –12340)
MS2711A PM 39
Set Return Sweep Time - Control Byte #114 (72h)
Description: If this is enabled, the duration of the current sweep (in milliseconds) will be returned as 4
bytes via the serial port at the end of the sweep. If serial echo status is enabled, the 4 bytes will be returned
AFTER the sweep complete byte.
Bytes to Follow: 1 byte
00h = Don’t Return Sweep Time
01h = Return Sweep Time
Spectrum Analyzer Returns: 225 (FFh) Operation Complete Byte
224 (E0h) Parameter Error
238 (EEh) Time-out Error
Set Sweep Averaging - Control Byte #118 (76h)
Description: Sets the number of sweeps to average. The maximum number is 25. Sending a 1 turns aver
aging off.
Bytes to Follow: 1 byte
Number of sweeps to average (1-25)
Spectrum Analyzer Returns: 225 (FFh) Operation Complete Byte
224 (E0h) Parameter Error
238 (EEh) Time-out Error
Exit remote mode - Control Byte #255 (FFh)
Description: MS2711A exits remote mode.
Bytes to Follow: 0 byte
-
Spectrum Analyzer Returns: 1 byte
1) Confirm flag FFh
The computer sends a serial stop byte #255 (FFh) to the MS2711A. Spectrum Analyzer returns a confirm
flag (FFh). The Spectrum Analyzer resumes sweeping, either continuously or singly.
You may also press the “ESCAPE” key on the Spectrum Analyzer key pad to exit from remote mode (given
that the serial communication is still in sync). In this case, the Spectrum Analyzer does not return a confirm
byte to the serial port.
When exiting remote mode, system parameters changed during remote mode are used immediately.
System parameters changed during remote mode are not written to the non-volatile EEPROM. You
may want to save the change to the run-time setup (saved setup location 0, which holds the
power-on defaults) or one of the nine saved setups(saved setup location 1-9). See control byte #18
(12h) for details. You can also use control byte #64 to specify that the runtime setup be automati
cally saved to setup location 0 when exiting remote mode.
-
40 MS2711A PM
Parameter Definitions
Parameter # of Bytes Step Example / Description
Frequency
Scale (dB/div)
(Ref Level)
Limit
Markers
Power Monitor:
dBm/dBr
Lock Fail
Counter
4 bytes unsigned 1 Hz 1000.3 MHz = 1000300000
4 bytes unsigned 1 / 1000 dB 8 dB = 8000
4 bytes unsigned 1 / 1000 dB +
270,000
4 bytes unsigned 1 / 1000 dB 51.3 dB = 51300
2 bytes unsigned 1 sweep point Marker values are given in relative position on the
4 bytes signed 1 / 1000 dBm
1 / 1000 dBr
2 bytes unsigned 1 error count 234 fails = 234
20 dB = 20,000 + 270,000 = 290,000
–20 dB = –20,000 + 270,000 = 250,000
graph.
The lowest value is 0; the highest value is 399.
51.3 dBm = 51300
10.4 dBr = 10400
MS2711A PM 41
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