Anritsu Spectrum Master MS2711D Owner's manual

Fast. Accurate, Repeatable, Portable Spectrum Analysis
Spectrum Master™
MS2711D
MS2712
MS2712
MS2712
SiteMaster
SpectrumMaster
CellMaster
MS2711DSpectrumMaster
S331DSiteMaster SiteMaster SpectrumMaster MT8212ACellMaster CellMaster
Programming Manual

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MS2711D Programming Manual
MS2711D
Remote Mode Command Specification
Rev 1.45

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May 2007
Copyright © 2007 Anritsu Co.
Part Number: 10580-00098
Revision: D

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Table of Contents
TABLE OF CONTENTS .......................................................................................................................................3
PROGRAMMING OVERVIEW ...............................................................................................................................6
GENERAL DESCRIPTION..............................................................................................................................................6
CABLES FOR THE SPECTRUM MASTER ........................................................................................................................6
SERIAL COMMUNICATION PARAMETERS ....................................................................................................................6
COMMUNICATIONS ERROR CHECKING .......................................................................................................................6
PARAMETER VALIDATION ..........................................................................................................................................6
ENTERING REMOTE MODE .........................................................................................................................................7
EXITING REMOTE MODE ............................................................................................................................................7
LIFETIME OF CHANGES TO SPECTRUM MASTER OPERATING PARAMETERS ................................................................7
WRITE CYCLE LIMITATION OF EEPROM...................................................................................................................7
DOCUMENTATION CONVENTIONS...............................................................................................................................7
Numeric Representation:.......................................................................................................................................7
Bit Positions: .........................................................................................................................................................7
CONTROL BYTE DESCRIPTIONS ........................................................................................................................8
SETUP SYSTEM –CONTROL BYTE #1 (01H)................................................................................................................8
SELECT MEASUREMENT MODE –CONTROL BYTE #3 (03H) .......................................................................................8
READ TIME/DATE –CONTROL BYTE #7 (07H) ...........................................................................................................9
SET TIME/DATE –CONTROL BYTE #8 (08H)...............................................................................................................9
SET TRACE NAME (REFERENCE NUMBER)–CONTROL BYTE #9 (09H) ....................................................................10
SERIAL PORT ECHO ON/OFF –CONTROL BYTE #10 (0AH).......................................................................................10
WATCH-DOG TIMER ON/OFF –CONTROL BYTE #12 (0CH) .....................................................................................11
STORE SWEEP TRACE –CONTROL BYTE #16 (10H) ..................................................................................................11
OBSOLETE: RECALL SWEEP TRACE –CONTROL BYTE #17 (11H) .........................................................................11
SAVE SYSTEM SETUP –CONTROL BYTE #18 (12H) ..................................................................................................15
RECALL SYSTEM SETUP –CONTROL BYTE #19 (13H) ..............................................................................................16
OBSOLETE: QUERY SYSTEM STATUS –CONTROL BYTE #20 (14H) ......................................................................16
TRIGGER SELF-TEST –CONTROL BYTE #21 (15H)....................................................................................................21
READ FAIL COUNTER –CONTROL BYTE #22 (16H) ..................................................................................................21
CLEAR FAIL COUNTERS –CONTROL BYTE #23 (17H)...............................................................................................21
QUERY TRACE NAMES –CONTROL BYTE #24 (18H) ................................................................................................22
DELETE SWEEP TRACE –CONTROL BYTE #25 (19H)................................................................................................22
OBSOLETE -UPLOAD SPA SWEEP TRACE –CONTROL BYTE #26 (1AH)...............................................................22
QUERY SWEEP MEMORY –CONTROL BYTE #27 (1BH) ............................................................................................26
QUERY SYSTEM STATUS –CONTROL BYTE #29 (1DH) ............................................................................................26
SELECT PRINTER TYPE –CONTROL BYTE #30 (1EH)................................................................................................35
RECALL SWEEP TRACE –CONTROL BYTE #33 (21H)................................................................................................35
OBSOLETE: SET A/B TRACE –CONTROL BYTE #34 (22H) ....................................................................................46
SET SPA A/B TRACE –CONTROL BYTE #35 (23H)...................................................................................................46
UPLOAD SPECTRUM MASTER SWEEP TRACE –CONTROL BYTE #36 (24H)...............................................................47
GET OPTIONS –CONTROL BYTE #37 (25H) ..............................................................................................................56
QUERY POWER LEVEL –CONTROL BYTE #39 (27H).................................................................................................56
SET POWER METER UNITS –CONTROL BYTE #40 (28H) ..........................................................................................57
POWER METER RELATIVE MODE ON/OFF –CONTROL BYTE #41 (29H)...................................................................57
POWER METER OFFSET MODE ON/OFF –CONTROL BYTE #42 (2AH)......................................................................57
POWER METER ZERO MODE ON/OFF –CONTROL BYTE #43 (2BH) .........................................................................58
POWER METER RMS AVERAGING ON/OFF –CONTROL BYTE #44 (2CH) ................................................................58
POWER METER CENTER FREQUENCY AND SPAN SETUP –CONTROL BYTE #45 (2DH) .............................................59
SWEEP DATA ECHO ON/OFF –CONTROL BYTE #49 (31H) .......................................................................................59
CHECK BATTERY STATUS –CONTROL BYTE #50 (32H) ...........................................................................................60
SET SPA MINIMUM SWEEP TIME –CONTROL BYTE #53 (35H) ................................................................................61

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SET TRIGGER POSITION –CONTROL BYTE #54 (36H) ...............................................................................................61
SET VIDEO TRIGGER LEVEL –CONTROL BYTE #55 (37H) ........................................................................................61
AUTOMATICALLY SAVE RUNTIME SETUP –CONTROL BYTE #64 (40H) ...................................................................62
DOWNLOAD SAVED SETUP –CONTROL BYTE #65 (41H)..........................................................................................62
UPLOAD SETUP –CONTROL BYTE #66 (42H) ...........................................................................................................72
READ PARAMETER LIMITS –CONTROL BYTE #67 (43H) ..........................................................................................82
QUERY SAVED SETUPS –CONTROL BYTE #68 (44H)................................................................................................89
ENTER REMOTE MODE –CONTROL BYTE #69 (45H)................................................................................................90
ENTER REMOTE MODE IMMEDIATELY –CONTROL BYTE #70 (46H) ........................................................................90
WRITE PROTECT SETUP –CONTROL BYTE #71 (47H)...............................................................................................91
CLEAR SETUP MEMORY LOCATION –CONTROL BYTE #72 (48H).............................................................................91
WRITE ANTENNA –CONTROL BYTE #82 (52H) ........................................................................................................92
RECALL ANTENNA –CONTROL BYTE #83 (53H) ......................................................................................................93
SET FIELD STRENGTH MEASUREMENT –CONTROL BYTE #84 (54H) ........................................................................93
SET CHANNEL POWER –CONTROL BYTE #85 (55H).................................................................................................94
READ CHANNEL POWER –CONTROL BYTE #86 (56H)..............................................................................................94
SET ADJACENT CHANNEL POWER RATIO (ACPR) –CONTROL BYTE #87 (57H) ......................................................95
READ ADJACENT CHANNEL POWER (ACPR) –CONTROL BYTE #88 (58H) ..............................................................95
SELECT SIGNAL STANDARD –CONTROL BYTE #89 (59H)........................................................................................96
SELECT CHANNEL IN CURRENT STANDARD –CONTROL BYTE #90 (5AH)................................................................96
READ CURRENT SETTINGS OF SIGNAL STANDARD –CONTROL BYTE #91 (5BH) .....................................................96
UPLOAD USER’S SIGNAL STANDARD TABLE –CONTROL BYTE #92 (5CH) ..............................................................97
MEASURE OCC BW %OF POWER –CONTROL BYTE #96 (60H) ..............................................................................97
MEASURE OCC BW DBDOWN –CONTROL BYTE #97 (61H)...................................................................................98
SET BIAS TEE FUNCTION -CONTROL BYTE #98 (62H) .............................................................................................98
SET SPECTRUM ANALYZER START/STOP FREQUENCY –CONTROL BYTE #99 (63H) ................................................99
SET SPECTRUM ANALYZER CENTER FREQ./SPAN –CONTROL BYTE #100 (64H)......................................................99
SET SPECTRUM ANALYZER SCALE –CONTROL BYTE #101 (65H) ..........................................................................100
SET SPECTRUM ANALYZER MARKER –CONTROL BYTE #102 (66H) ......................................................................100
SET SPECTRUM ANALYZER SINGLE LIMIT –CONTROL BYTE #103 (67H)...............................................................101
OBSOLETE: SET SPA RESOLUTION BANDWIDTH –CONTROL BYTE #106 (6AH)................................................101
OBSOLETE: SET SPECTRUM ANALYZER VIDEO BANDWIDTH –CONTROL BYTE #107 (6BH)..............................102
SET SPECTRUM ANALYZER SWEEP MODE –CONTROL BYTE #108 (6CH) ..............................................................102
SET SPECTRUM ANALYZER MARKER TO PEAK –CONTROL BYTE #109 (6DH).......................................................102
SET SPECTRUM ANALYZER MARKER TO CENTER –CONTROL BYTE #110 (6EH) ...................................................103
OBSOLETE: SET SPECTRUM ANALYZER ATTENUATION –CONTROL BYTE #111 (6FH) ......................................103
SET SPECTRUM ANALYZER MULTIPLE LIMIT –CONTROL BYTE #113 (71H) ..........................................................104
SET RETURN SPECTRUM ANALYZER SWEEP TIME –CONTROL BYTE #114 (72H)...................................................105
SET REFERENCE LEVEL OFFSET –CONTROL BYTE #115 (73H) ..............................................................................105
SET SPECTRUM ANALYZER IMPEDANCE –CONTROL BYTE #116 (74H)..................................................................106
READ MARKER VALUE –CONTROL BYTE #117 (75H) ...........................................................................................107
SET SWEEP AVERAGING –CONTROL BYTE #118 (76H)..........................................................................................107
NORMALIZE SPA –CONTROL BYTE #130 (82H).....................................................................................................108
SET SPA NORMALIZATION STATUS –CONTROL BYTE #131 (83H)........................................................................108
CHECK SPECTRUM ANALYZER EXTERNAL REFERENCE –CONTROL BYTE #134 (86H)...........................................108
SET SA PREAMP STATE (ON/OFF/AUTO)–CONTROL BYTE #136 (88H) ................................................................109
SET SPECTRUM ANALYZER UNITS –CONTROL BYTE #140 (8CH) .........................................................................109
SET SPECTRUM ANALYZER RESOLUTION BANDWIDTH –CONTROL BYTE #141 (8DH) ..........................................110
SET SPECTRUM ANALYZER VIDEO BANDWIDTH –CONTROL BYTE #142 (8EH).....................................................110
SET SPECTRUM ANALYZER ATTENUATION –CONTROL BYTE #143 (8FH) .............................................................110
SET AM/FM DEMODULATION –CONTROL BYTE #145 (91H).................................................................................111
SET BAUD RATE –CONTROL BYTE #197 (C5H) .....................................................................................................111
SET LANGUAGE –CONTROL BYTE #198 (C6H) ......................................................................................................112
QUERY TIME –CONTROL BYTE #208 (D0H) ..........................................................................................................112
READ MAIN SERIAL NUMBER –CONTROL BYTE #221 (DDH)................................................................................112
READ ASCII SERIAL NUMBER –CONTROL BYTE #225 (E1H)................................................................................113

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GPS POWER –CONTROL BYTE #237 (EDH)...........................................................................................................113
READ GPS POSITION –CONTROL BYTE #238 (EEH) ..............................................................................................113
AUTOMATIC CAL DISABLE –CONTROL BYTE #240 (F1H)......................................................................................114
RECALL SWEEP TRACE –CONTROL BYTE #243 (F3H)...........................................................................................114
EXIT REMOTE MODE –CONTROL BYTE #255 (FFH) ..............................................................................................114
SELECT SPA/POWER METER SIGNAL STANDARD –CONTROL WORD (A103H)......................................................115
SELECT SPA/POWER METER CHANNEL –CONTROL WORD (A104H).....................................................................115
READ EXTERNAL MODULE NAME –CONTROL WORD (A201H) .............................................................................115
READ EXTERNAL MODULE SERIAL NUMBER –CONTROL WORD (A202H).............................................................116
READ EXTERNAL MODULE FREQUENCY RANGE –CONTROL WORD (A203H) .......................................................116
CLEAR MODULE FAIL COUNTER –CONTROL WORD (A205H) ...............................................................................117
PERFORM TRANSMISSION MODE CALIBRATION –CONTROL WORD (A301H) ........................................................117
TURN OFF TRANSMISSION MODE CALIBRATION –CONTROL WORD (A302H) ......................................................117
GET SIGNAL STANDARD NAME –CONTROL WORD (A501H) .................................................................................118
PERFORM NOISE DIODE CAL –CONTROL WORD (A505H) .....................................................................................118
SET BIAS TVOLTAGE –CONTROL WORD (A506H)................................................................................................118
SELECT FUNCTION IN IA MEASUREMENT MODE –CONTROL WORD (A700H) .......................................................118
SPECTROGRAM:SET SWEEP INTERVAL –CONTROL WORD (A721H)......................................................................119
SPECTROGRAM:SET TIME SPAN OF MEASUREMENT –CONTROL WORD (A722H) .................................................119
SPECTROGRAM:TURN ON/OFF AUTO SAVE –CONTROL WORD (A723H) ..............................................................119
SPECTROGRAM:GET TRACE NAME –CONTROL WORD (A724H) ...........................................................................120
SPECTROGRAM:RECALL TRACE –CONTROL WORD (A725H) ...............................................................................121
SET FREQUENCY IN CW GENERATOR MODE -CODE WORD(A801H)............................................................121
RETRIEVE POWER IN CW GENERATOR MODE -CODE WORD(A802H).........................................................122
REMOTE SELF TEST –CONTROL WORD (AA15H) ..................................................................................................122
TRIGGER SWEEP –CONTROL WORD (AA30H) .......................................................................................................124
PARAMETER DEFINITIONS..............................................................................................................................125
PROGRAMMING EXAMPLES............................................................................................................................126
EXAMPLES IN C: 126
EXAMPLE IN VISUAL BASIC....................................................................................................................................133
REVISION HISTORY............................................................................................................................................135

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Programming Overview
Warning: This programming manual is written exclusively for Anritsu Spectrum
Master Model MS2711D. For information on firmware upgrades, contact your local
Anritsu Service Center. Commands listed in this manual are not all backward-
compatible with earlier Anritsu models.
General Description
The Spectrum Master must first be set into “remote” mode for communication with a computer. Remote mode
differs from normal repetitive sweep and single-sweep modes. During remote mode, the Spectrum Master suspends
normal operations and attends to the serial port. The front panel display indicates when the Spectrum Master is in
remote mode.
Once in remote mode, you send a series of control bytes and associated data to the Spectrum Master. These control
byte sequences command the Spectrum Master to perform various functions and activities. The serial port supports
virtually all features accessible from the keypad. The only exception is the printer, which requires connection to the
same 9 pin connector on the Spectrum Master rear panel.
To complete the communication session, send the control byte to exit remote mode. Spectrum Master resumes
normal operations. You may also exit the remote mode by using the ESCAPE/CLEAR key.
Cables for the Spectrum Master
Serial communications take place via the 9 pin connector on the back of the Spectrum Master. The Spectrum
Master is a DTE-type serial device and therefore requires a “null modem” cable for communication with a
computer, which is also a DTE device. We provide a suitable cable with your Spectrum Master. (Anritsu part
number 800-441)
Serial Communication Parameters
The Spectrum Master 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. The Set Baud Rate serial command Control Byte #197 (C5h) can be used to
change the baud rate to other common baud rates.
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 Master. For data streams going to the Spectrum
Master, the “watch dog timer” protects against interrupted transmissions by aborting a control byte sequence if the
inter-byte time limit is exceeded.
Parameter Validation
The Spectrum Master validates input parameters for each control byte sequence. If the input parameters are out of
range or invalid, the Spectrum Master notifies the computer by sending Parameter Error Byte #224 (E0h). The
Spectrum Master discards the received data and waits for the next control byte.

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Entering Remote Mode
Send the Enter Remote Mode Byte #69 (45h) to the Spectrum Master 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 Spectrum Master’s serial port buffer is one byte wide. No internal buffer exists, so waiting for the unit’s
response is essential. If the Spectrum Master 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 soon as it receives the byte. Note that this means that data
stored for the current sweep may be incomplete.
Once you receive the response string from Spectrum Master, you are in remote mode.
Exiting Remote Mode
Send the Exit Remote control byte #255 (FFh) to the Spectrum Master. Spectrum Master sends a response byte of
255 (FFh) then exits remote mode. Remote mode can also be exited by pressing the ESCAPE/CLEAR key.
Lifetime of Changes to Spectrum Master 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.
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 nine saved setups. See control byte #18 (12h) for
details.
Write Cycle Limitation of EEPROM
The EEPROM, used to store calibrations, setups and traces has a guaranteed lifetime of at least 100,000 write cycles
and an unlimited 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 Spectrum Master. Keep the number of
write cycles to a minimum.
Documentation Conventions
Through this manual the following conventions will be observed:
Numeric Representation:
Hexadecimal numbers are represented with the suffix h. For example, the decimal number 255 is represented in
hexadecimal as FFh.
Binary numbers are represented with the suffix b. For example, the decimal number 2 is represented in binary as
10b.
Decimal numbers are represented with the prefix # when referring to a control byte (command byte) and without a
prefix or suffix in all other cases.
Bit Positions:
When enumerating bits in a byte, bit 0 will always be the least significant bit (LSB).

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Control Byte Descriptions
Setup System – Control Byte #1 (01h)
Description: Sets system status flags and switches. The current value of the flags can be obtained by executing
command #29, Query System Setup, and parsing the values from the appropriate bytes. The Spectrum Master acts
on the entire byte. So, the state of each of the bits must be defined every time the command is issued. See control
byte #29 (1Dh) response bytes 275 and 276 for current Spectrum Master configuration.
Bytes to Follow: 1 byte
1) Status byte
bit 0 = RBW Coupling (to span) (1b = auto 0b = manual)
bit 1 = VBW Coupling (to RBW) (1b = auto 0b = manual)
bit 2 = LCD Back Light ON/OFF (1b = ON 0b = OFF)
bits 3-4 = Logarithmic Amplitude units (00b = dBm 01b = dBV 10b = dBmV 11b = dBuV)
bits 5-6 = Detection algorithm (00b = positive peak 01b = RMS average 10b = negative peak
11b = Sampling)
bit 7 = Attenuation Coupling (to ref level) (1b = auto 0b = manual)
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
238 (EEh) Time-out Error
Select Measurement Mode – Control Byte #3 (03h)
Description: Sets the measurement mode of the Spectrum Master. The response byte will not be sent until the
mode change is complete.
See control byte #29 (1Dh) response byte 3 for the current Spectrum Master measurement mode.
Bytes to Follow: 1 byte
1) Measurement Mode
30h: Spectrum Analyzer Mode
31h: Transmission Mode
39h: Channel Scanner Mode
3Bh: Interference Analyzer Mode
3Ch: CW Signal Generator Mode
40h: Power Meter Mode (narrow band)
41h: Power Monitor Mode (Option 5)
42h: High Accuracy Power Meter Mode
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid measurement mode
238 (Eeh) Time-out Error

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Read Time/Date – Control Byte #7 (07h)
Description: Reads the current 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
using control byte #8.
Bytes to Follow: 0 bytes
Spectrum Master Returns: 7 bytes
1) Hour
2) Minute
3) Month
4) Day
5) Year (Higher byte)
6) Year (Lower byte)
7) Daylight Saving On/Off (01h = On, 00h = Off)
Set Time/Date – Control Byte #8 (08h)
Description: Sets the current time and date.
This Time/Date is stamped into all stored sweeps (for users’ reference).
The Spectrum Master stores bytes as ASCII text. Recommended time form is “hh:mm:ss” (hour:minute:sec).
Recommended date format is “mm/dd/yyyy” (month/day/year).
The current time setting can be found by using control byte #33 to recall trace 0 and examining response bytes 31-
38.
The current date setting can be found by using control byte #33 to recall trace 0 and examining response bytes 21-
30.
Bytes to Follow: 7 bytes
1) Hour
2) Minute
3) Month
4) Day
5) Year (Higher byte)
6) Year (Lower byte)
7) Daylight Saving (01h = On, 00h = Off)
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
238 (Eeh) Time-out Error

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Set Trace Name (Reference Number) – Control Byte #9 (09h)
Description: Stores a Reference Number with the sweep trace.
The reference number is also known as the trace name. It is any combination of 16 letters, numbers and the
characters “-“, “,”, “.” And “+”. This command stores a trace name with the sweep trace.
The current reference number is found by recalling trace 0 and examining response bytes 39 to 54.
Bytes to Follow: 16 bytes (ASCII text string)
Spectrum Master Returns: 1 byte
255 (FFh) Operation Complete Byte
238 (Eeh) Time-out Error
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 #11 (0Bh)). At the end of each sweep cycle,
the Spectrum Master sends a Sweep Complete Byte #192 (C0h) to the serial port.
This mode activates once the Spectrum Master exits 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 Spectrum Master and computer by doing the
following:
1) Enter remote mode. Set Serial Port Echo Mode On. Exit remote mode.
2) The Spectrum Master 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 Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid serial port echo status
238 (Eeh) Time-out Error

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Watch-Dog Timer On/Off – Control Byte #12 (0Ch)
Description: Enables or disables the Watch-dog timer. Default is Disabled.
The Spectrum Master incorporates a watch-dog timer for higher reliability in serial communication. In selected
control bytes (see control byte summary), the Spectrum Master 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 Master notifies
the computer by sending Time-out Byte #238 (EEh). The Spectrum Master 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
00h = Off
01h = On
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid watch-dog timer status
Store Sweep Trace – Control Byte #16 (10h)
Description: Saves current trace to the next available memory location. Trace name can be set using control byte
#9, “Set Trace Name (Reference Number)” before executing this command.
Bytes to Follow: 0 bytes
Spectrum Master 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
OBSOLETE: Recall Sweep Trace – Control Byte #17 (11h)
This command exists for backward compatibility with MS2711B models. To access the new features use
Control Byte #33 (21h). This command cannot be used with a frequency extension module (option 6
required) attached.
Description: Queries the Spectrum Master for sweep trace data.
NOTE: Before you can recall a sweep stored in non-volatile memory (trace numbers 1-200) you must build a trace
table in the Spectrum Master’s RAM. Use Control Byte #24 to build the trace table. Since the trace table exists in
RAM, Control Byte #24 must be executed every time the Spectrum Master’s power is cycled.
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 Master Returns: 1950 bytes
1-2) # of following bytes (1948 for a valid sweep)
3-4) Model ID (16h for the MS2711D)
5-11) Model Number (7 bytes in ASCII)
12-15) Software Version (4 bytes in ASCII)
16) Measurement Mode1
1See Control Byte #3 for available measurement modes.

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17-20) Time/Date (long integer format)
21-30) Date in String Format (mm/dd/yyyy)
31-38) Time in String Format (hh:mm:ss)
39-54) Reference Number/Trace Name (16 bytes in ASCII)
55-56) # data points (400)
57) Start Frequency (in Hz) (Highest byte)
58) Start Frequency (in Hz)
59) Start Frequency (in Hz)
60) Start Frequency (in Hz) (Lowest byte)
61) Stop Frequency (in Hz) (Highest byte)
62) Stop Frequency (in Hz)
63) Stop Frequency (in Hz)
64) Stop Frequency (in Hz) (Lowest byte)
65) Center Frequency (in Hz) (Highest byte)
66) Center Frequency (in Hz)
67) Center Frequency (in Hz)
68) Center Frequency (in Hz) (Lowest byte)
69) Frequency Span (in Hz) (Highest byte)
70) Frequency Span (in Hz)
71) Frequency Span (in Hz)
72) Frequency Span (in Hz) (Lowest byte)
73) Minimum Frequency Step Size (in Hz) (Highest byte)
74) Minimum Frequency Step Size (in Hz)
75) Minimum Frequency Step Size (in Hz)
76) Minimum Frequency Step Size (in Hz) (Lowest byte)
77) Ref Level2(Highest byte)
78) Ref Level
79) Ref Level
80) Ref Level (Lowest byte)
81) Scale per div3(Highest byte)
82) Scale per div
83) Scale per div
84) Scale per div (Lowest byte)
85) Frequency Marker 14(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) Frequency Marker 5 (Higher byte)
94) Frequency Marker 5 (Lower byte)
95) Frequency Marker 6 (Higher byte)
96) Frequency Marker 6 (Lower byte)
97) Single Limit5(Highest byte)
98) Single Limit
99) Single Limit
2“value” sent as (value in dBm * 1,000) + 270,000
3“value” sent as (value * 1,000)
4Display/Data Point
To convert from “point” to frequency:
((span / (#data points-1)) * point) + start frequency
where span is stored in bytes 69-72 and #data points is stored in bytes 55-56
5“value” sent as (value in dBm * 1,000) + 270,000

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100) Single Limit (Lowest byte)
101) Multiple Upper Limit 1 Start X (Frequency in Hz) (Highest byte)
102) Multiple Upper Limit 1 Start X (Frequency in Hz)
103) Multiple Upper Limit 1 Start X (Frequency in Hz)
104) Multiple Upper Limit 1 Start X (Frequency in Hz) (Lowest byte)
105) Multiple Upper Limit 1 Start Y (Power Level6) (Highest byte)
106) Multiple Upper Limit 1 Start Y (Power Level)
107) Multiple Upper Limit 1 Start Y (Power Level)
108) Multiple Upper Limit 1 Start Y (Power Level) (Lowest byte)
109) Multiple Upper Limit 1 End X (Frequency in Hz) (Highest byte)
110) Multiple Upper Limit 1 End X (Frequency in Hz)
111) Multiple Upper Limit 1 End X (Frequency in Hz)
112) Multiple Upper Limit 1 End X (Frequency in Hz) (Lowest byte)
113) Multiple Upper Limit 1 End Y (Power Level7) (Highest byte)
114) Multiple Upper Limit 1 End Y (Power Level)
115) Multiple Upper Limit 1 End Y (Power Level)
116) Multiple Upper Limit 1 End Y (Power Level) (Lowest byte)
117-260) Multiple Upper Limits 2-5, Multiple Lower Limits 1-5 (see bytes 101-116 for format)
261) RBW Setting (Frequency in Hz) (Highest byte)
262) RBW Setting (Frequency in Hz)
263) RBW Setting (Frequency in Hz)
264) RBW Setting (Frequency in Hz) (Lowest byte)
265) VBW Setting (Frequency in Hz) (Highest byte)
266) VBW Setting (Frequency in Hz)
267) VBW Setting (Frequency in Hz)
268) VBW Setting (Frequency in Hz) (Lowest byte)
269) OCC BW Method (00h = % of power, 01h = dB down)
270) OCC BW % Value (0-99) (Highest byte)
271) OCC BW % Value (0-99)
272) OCC BW % Value (0-99)
273) OCC BW % Value (0-99) (Lowest byte)
274) OCC BW dBc (0–120) (Highest byte)
275) OCC BW dBc (0–120)
276) OCC BW dBc (0–120)
277) OCC BW dBc (0–120) (Lowest byte)
278) Attenuation8(Highest byte)
279) Attenuation
280) Attenuation
281) Attenuation (Lowest byte)
282-297) Antenna Name (16 bytes in ASCII)
298) Reference Level Offset9(Highest byte)
299) Reference Level Offset
300) Reference Level Offset
301) Reference Level Offset (Lowest byte)
302) Impedance10
303) Impedance Loss11 (Highest byte)
6“value” sent as (value in dBm * 1,000) + 270,000
7“value” sent as (value in dBm * 1,000) + 270,000
8“value” sent as (value * 1,000)
9“value” sent as (value in dBm * 1,000) + 270,000
10 Impedance adapters:
00h = 50 Ω
0Ah = 75 Ω, adapter 12N50-75B
0Ch = 75 Ω, other adapter offset
11 “value” sent as (value * 1,000)

14
304) Impedance Loss
305) Impedance Loss
306) Impedance Loss (Lowest byte)
307) N/A
308) N/A
309) N/A
310) N/A
311) N/A
312) N/A
313) N/A
314) N/A
315) Status Byte 1: (0b = Off, 1b = 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 : Marker 5 On/Off
bit 5 : Marker 6 On/Off
bits 6-7 : Not Used
316) Status Byte 2: (0b = Off, 1b = On)
(LSB) bit 0 : Marker 2 Delta On/Off
bit 1 : Marker 3 Delta On/Off
bit 2 : Marker 4 Delta On/Off
bits 3-7: Not Used
317) Status Byte 3: (0b = Off, 1b = On)
(LSB) bit 0 : Antenna Factor Correction On/Off
bits 1-2 : Detection alg (00b = pos. peak 10b = neg. peak 11b = RMS averaging)
bits 3-4 : Logarithmic Amplitude Units (00b = dBm 01b = dBV 10b = dBmV11b =
dBuV)
bit 5 : Channel Power On/Off
bit 6 : Adjacent Channel Power On/Off
bit 7 : Occupied Bandwidth On/Off
318) Status Byte 4: (0b = Off/LOWER limit, 1b = On/UPPER limit)
(LSB) bit 0 : Limit Type (0b = Single, 1b = Multiple)
bit 1 : Not Used
bit 2 : Single Limit On/Off
bit 3 : Single Limit Level UPPER/ LOWER
bit 4 : Multiple Limit Upper Segment 1 Status On/Off
bit 5 : Multiple Limit Upper Segment 1 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Upper Segment 2 Status On/Off
bit 7 : Multiple Limit Upper Segment 2 Limit Level UPPER / LOWER
319) Status Byte 5: (0b = Off/LOWER limit, 1b = On/UPPER limit)
(LSB) bit 0 : Multiple Limit Upper Segment 3 Status On/Off
bit 1 : Multiple Limit Upper Segment 3 Limit Level UPPER / LOWER
bit 2 : Multiple Limit Upper Segment 4 Status On/Off
bit 3 : Multiple Limit Upper Segment 4 Limit Level UPPER / LOWER
bit 4 : Multiple Limit Upper Segment 5 Status On/Off
bit 5 : Multiple Limit Upper Segment 5 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Lower Segment 1 Status On/Off
bit 7 : Multiple Limit Lower Segment 1 Limit Level UPPER / LOWER
320) Status Byte 6: (0b = Off/LOWER limit, 1b = On/UPPER limit)
(LSB) bit 0 : Multiple Limit Lower Segment 2 Status On/Off
bit 1 : Multiple Limit Lower Segment 2 Limit Level UPPER / LOWER
bit 2 : Multiple Limit Lower Segment 3 Status On/Off
bit 3 : Multiple Limit Lower Segment 3 Limit Level UPPER / LOWER
bit 4 : Multiple Limit Lower Segment 4 Status On/Off

15
bit 5 : Multiple Limit Lower Segment 4 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Lower Segment 5 Status On/Off
bit 7 : Multiple Limit Lower Segment 5 Limit Level UPPER / LOWER
321) Status Byte 7
(LSB) bits 0-6 : Number of Sweeps to Average (1-25, 1 implies averaging Off)
bit 7 : Reserved
322) Status Byte 8: (0b = Off, 1b = On
(LSB) bit 0 : Preamp On/Off
bit 1 : Normalization On/Off
bit 2 : Bias Tee On/Off
bit 3 : Scale Type (0b = Log, 1b = Linear)
bit 4 : Linear Units (0b = Watts, 1b = Volts)
bits 5-7 : Date Format (000b = MMDDYYYY, 001b = DDMMYYYY, 010b =
YYYYMMDD)
323) N/A
324) N/A
325-350) Not Used
351-1950) Sweep Data (400 points * 4 bytes/point = 1600 bytes)
4 bytes for each data point
1.dBm
2(Highest byte)
2.dBm
3.dBm
4. dBm (Lowest byte)
Spectrum Master Returns (For invalid sweeps/empty stored sweep locations):11 bytes
1-2) Number of following bytes (9 bytes for invalid sweep recall)
3-4) Model # (unsigned integer, 16h for Spectrum Master model MS2711D)
5-11) Extended Model # (7 bytes in ASCII)
Spectrum Master Returns (Invalid sweep location): 1 byte
1) 224 Parameter Error: Invalid sweep location
Save System Setup – Control Byte #18 (12h)
Description: Saves current system setup parameters to a specific setup store location.
The Spectrum Master saves all parameters described in Query System Status - Control Byte #29 (1Dh), (except
Serial Port Echo Status) to the specified store location. Store location 0 is the run-time setup of the Spectrum
Master. It holds the power-on defaults of the Spectrum Master.
Bytes to Follow: 1 byte
1) Location to save system setup parameters:
0 – 10 for Spectrum Analyzer and Transmission Modes (Option 21 Only)
0 – 5 for Power Meter Mode (Option 29 Only)
0 – 5 for T1/E1 Modes (Option 50 Only)
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid store location
238 (EEh) Time-out Error

16
Recall System Setup – Control Byte #19 (13h)
Description: Recalls system setup parameters from a specific store location. Storage locations depend on the
measurement mode of the current setup. When the current mode is Spectrum Analyzer, Spectrum Analyzer setups
(1-10) can be recalled. When the current mode is Power Meter, one of the 5 Power Meter setups can be recalled..
When the current mode is T1/E1, one of the T1/E1 setups can be recalled (1-5).
The Spectrum Master recalls all parameters described in Query System Status - Control Byte #29 (1Dh), (except
Serial Port Echo Status) from the specified store location. The recalled setup does not automatically become the
power-on runtime setup when exiting remote. Therefore, a call to #29 will not display the parameters in that setup.
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 runtime setup). See control byte #18 (12h) for details.
Bytes to Follow: 1 byte
1) Location from which to recall system setup parameters:
0 = Run time setup for all measurement modes
1 – 10 = Saved setups for Spectrum Analyzer and Transmission modes (Option 21 Only)
1 – 5 = Saved setups for Power Meter mode (Option 29 Only)
1 – 5 = Saved setups for T1/E1 modes (Option 50 Only)
254 = Default setup, current mode
255 = Default setup, all modes
Spectrum Master Returns: 1 byte
1) 255 (FFh) Operation Complete Byte
224 (E0h) Parameter Error : Invalid store location or no saved setup
227 (E3h) Frequency Mismatch Error
238 (EEh) Time-out Error
OBSOLETE: Query System Status – Control Byte #20 (14h)
This command exists for backward compatibility with the MS2711B To access the new features use Control
Byte #29 (1Dh). This command cannot be used with a frequency extension module (option 6 required)
attached.
Description: Queries the Spectrum Master for current system settings.
The current state of the Spectrum Master represents the state after the last successful remote control operation.
For example, change the start frequency to another valid frequency while in remote mode, then execute control byte
#29. The new start frequency will be returned in bytes 4-7, even though no sweep has been performed with that
frequency.
Bytes to Follow: 0 bytes
Spectrum Master Returns: 310 bytes
1) Measurement Mode12
2-3) Number of Data Points (400)
4) Start Frequency (in Hz) (Highest byte)
5) Start Frequency (in Hz)
6) Start Frequency (in Hz)
7) Start Frequency (in Hz) (Lowest byte)
8) Stop Frequency (in Hz) (Highest byte)
9) Stop Frequency (in Hz)
10) Stop Frequency (in Hz)
11) Stop Frequency (in Hz) (Lowest byte)
12 See Control Byte #3 for available measurement modes.

17
12) Center Frequency (in Hz) (Highest byte)
13) Center Frequency (in Hz)
14) Center Frequency (in Hz)
15) Center Frequency (in Hz) (Lowest byte)
16) Frequency Span (in Hz) (Highest byte)
17) Frequency Span (in Hz)
18) Frequency Span (in Hz)
19) Frequency Span (in Hz) (Lowest byte)
20) Minimum Frequency Step Size (in Hz) (Highest byte)
21) Minimum Frequency Step Size (in Hz)
22) Minimum Frequency Step Size (in Hz)
23) Minimum Frequency Step Size (in Hz) (Lowest byte)
24) Ref Level13 (Highest byte)
25) Ref Level
26) Ref Level
27) Ref Level (Lowest byte)
28) Scale per div14 (Highest byte)
29) Scale per div
30) Scale per div
31) Scale per div (Lowest byte)
32) Marker 115 (Higher byte)
33) Marker 1 (Lower byte)
34) Marker 2 (Higher byte)
35) Marker 2 (Lower byte)
36) Marker 3 (Higher byte)
37) Marker 3 (Lower byte)
38) Marker 4 (Higher byte)
39) Marker 4 (Lower byte)
40) Marker 5 (Higher byte)
41) Marker 5 (Lower byte)
42) Marker 6 (Higher byte)
43) Marker 6 (Lower byte)
44) Spectrum Analyzer Single Limit16 (Highest byte)
45) Spectrum Analyzer Single Limit
46) Spectrum Analyzer Single Limit
47) Spectrum Analyzer Single Limit (Lowest byte)
48) Multiple Upper Limit 1 Start X (Frequency in Hz) (Highest byte)
49) Multiple Upper Limit 1 Start X (Frequency in Hz)
50) Multiple Upper Limit 1 Start X (Frequency in Hz)
51) Multiple Upper Limit 1 Start X (Frequency in Hz) (Lowest byte)
52) Multiple Upper Limit 1 Start Y (Power Level17) (Highest byte)
53) Multiple Upper Limit 1 Start Y (Power Level)
54) Multiple Upper Limit 1 Start Y (Power Level)
55) Multiple Upper Limit 1 Start Y (Power Level) (Lowest byte)
56) Multiple Upper Limit 1 End X (Frequency in Hz) (Highest byte)
57) Multiple Upper Limit 1 End X (Frequency in Hz)
58) Multiple Upper Limit 1 End X (Frequency in Hz)
13 “value” sent as (value in dBm * 1,000) + 270,000
14 “value” sent as (value * 1,000)
15 Display/Data Point
To convert from “point” to frequency:
(span / (#data points-1)) * point + start frequency
where span is stored in bytes 16-19 and #data points is stored in bytes 2-3
16 “value” sent as (value in dBm * 1,000) + 270,000
17 “value” sent as (value in dBm * 1,000) + 270,000

18
59) Multiple Upper Limit 1 End X (Frequency in Hz) (Lowest byte)
60) Multiple Upper Limit 1 End Y (Power Level) (Highest byte)
61) Multiple Upper Limit 1 End Y (Power Level)
62) Multiple Upper Limit 1 End Y (Power Level)
63) Multiple Upper Limit 1 End Y (Power Level) (Lowest byte)
64-207) Multiple Upper Limits 2-5, Multiple Lower Limits 1-5 (see bytes 48-63 for format)
208) RBW Setting18 (Highest byte)
209) RBW Setting
210) RBW Setting
211) RBW Setting (Lowest byte)
212) VBW Setting19 (Highest byte)
213) VBW Setting
214) VBW Setting
215) VBW Setting (Lowest byte)
216) OCC BW Method (00h = % of power, 01h = dB down)
217) OCC BW % Value (0-99) (Highest byte)
218) OCC BW % Value (0-99)
219) OCC BW % Value (0-99)
220) OCC BW % Value (0-99) (Lowest byte)
221) OCC BW dBc (0-120) (Highest byte)
222) OCC BW dBc (0-120)
223) OCC BW dBc (0-120)
224) OCC BW dBc (0-120) (Lowest byte)
225) Attentuation20 (Highest byte)
226) Attentuation
227) Attentuation
228) Attentuation (Lowest byte)
229) Antenna Index (0-14)
230-245) Antenna Name (16 bytes in ASCII)
246) AM/FM Demod Type (00h = FM-Wide Band, 01h = FM-Narrow Band, 02h = AM, 03h =
SSB/CW)
247) AM/FM Demod Volume (00h = min, FFh = max)
248) Reference Level Offset21 (Highest byte)
249) Reference Level Offset
250) Reference Level Offset
251) Reference Level Offset (Lowest byte)
252) Impedance22
253) Impedance Loss23 (Highest byte)
254) Impedance Loss
255) Impedance Loss
256) Impedance Loss (Lowest byte)
257) N/A
258) N/A
259) N/A
260) N/A
261) N/A
262) N/A
263) N/A
18 RBW: 00h = 10 kHz, 01h = 30 kHz, 02h = 100 kHz, 03h = 1 MHz
19 VBW: 00h = 100 Hz, 01h = 300 Hz, 02h = 1 kHz, 03h = 3 kHz, 04h = 10 kHz, 05h = 30 kHz, 06h = 100 kHz, 07h
= 300 kHz
20 Attenuation: 00h = 0 dB, 01h = 10 dB, 02h = 20 dB, 03h = 30 dB, 04h = 40 dB, 05h = 50 dB
21 “value” sent as (value in dBm * 1,000) + 270,000
22 Impedance Adapter: 00h = 50 Ω, 0Ah = 75 Ω, adapter 12N50-75B, 0Ch = 75 Ω, other adapter offset
23 “value” sent as (value in dBm * 1,000) + 270,000

19
264) N/A
265) Status Byte 1: (0b = Off, 1b = 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 : Marker 5 On/Off
bit 5 : Marker 6 On/Off
bits 6-7 : Not Used
266) Status Byte 2: (0b = Off, 1b = 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
bits 4-7: Not Used
267) Status Byte 3: (0b = Off, 1b = On)
(LSB) bit 0 : Antenna Factors Correction On/Off
bit 1 : AM/FM Demod Status On/Off
bit 2 : SPA Cal Status On/Off
bit 3-4 : Logarithmic Amplitude Units (00b = dBm 01b = dBV 10b = dBmV 11b =
dBuV)
bit 5-6 : Detection Alg (00b = positive peak 10b = negative peak, 11b = RMS averaging)
bit 7 : LCD Back Light On/Off
268) Status Byte 4: (0b = Off, 1b = On)
(LSB) bit 0 : Limit Type (0b = Single, 1b = Multiple)
bit 1 : Single Limit Beep On/Off
bit 2 : Single Limit Status On/Off
bit 3 : Single Limit Level (0b = LOWER, 1b = UPPER)
bit 4 : Multiple Limit Upper Segment 1 Status On/Off
bit 5 : Multiple Limit Upper Segment 1 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Upper Segment 2 Status On/Off
bit 7 : Multiple Limit Upper Segment 2 Limit Level UPPER / LOWER
269) Status Byte 5: (0b = Off/LOWER limit, 1b = On/UPPER limit)
(LSB) bit 0 : Multiple Limit Upper Segment 3 Status On/Off
bit 1 : Multiple Limit Upper Segment 3 Limit Level UPPER / LOWER
bit 2 : Multiple Limit Upper Segment 4 Status On/Off
bit 3 : Multiple Limit Upper Segment 4 Limit Level UPPER / LOWER
bit 4 : Multiple Limit Upper Segment 5 Status On/Off
bit 5 : Multiple Limit Upper Segment 5 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Lower Segment 1 Status On/Off
bit 7 : Multiple Limit Lower Segment 1 Limit Type UPPER / LOWER
270) Status Byte 6: (0b = Off/LOWER limit, 1b = On/UPPER limit)
(LSB) bit 0 : Multiple Limit Lower Segment 2 Status On/Off
bit 1 : Multiple Limit Lower Segment 2 Limit Level UPPER / LOWER
bit 2 : Multiple Limit Lower Segment 3 Status On/Off
bit 3 : Multiple Limit Lower Segment 3 Limit Level UPPER / LOWER
bit 4 : Multiple Limit Lower Segment 4 Status On/Off
bit 5 : Multiple Limit Lower Segment 4 Limit Level UPPER / LOWER
bit 6 : Multiple Limit Lower Segment 5 Status On/Off
bit 7 : Multiple Limit Lower Segment 5 Limit Level UPPER / LOWER
271) Status Byte 7: (0b = Off , 1b = On)
(LSB) bit 0 : Serial Port Echo Status On/Off
bit 1 : Return Sweep Time On/Off
bit 2 : RBW Coupling (to span) (1b = auto, 0b = manual)
bit 3 : VBW Coupling (to RBW) (1b = auto, 0b = manual)
bit 4 : Attenuation Coupling (to ref. Level) (1b = auto, 0b = manual)