Anritsu Spectrum Master MS2711D Programming Manual page 7

current sweep may be incomplete. Once a response string is received from the Spectrum Master, the unit is ready to accept
additional control bytes.
Exiting Remote Mode
To exit remote mode, send the Exit Remote Control byte #255 (FFh) to the Spectrum Master. The Spectrum Master sends a
response byte of 255 (FFh) then exits remote mode. Remote mode can also be exited by pressing the ESCAPE/CLEAR
front panel key.
Remote Mode Changes to Spectrum Master Operating Parameters
System parameters changed during remote mode remain changed for normal operation after the unit exits remote mode.
However, the changes are not automatically written to the non-volatile EEPROM. Turning off the Spectrum Master power
erases the changed settings.
To retain the changes, the setup must be saved to one of the setup memory locations. Use either the run-time setup location 0,
(which holds the power-on defaults) or one of the nine other setup locations. Control byte #64 (40h) sets the auto-save flag
which commands the Spectrum Master to automatically save the changes to the run-time setup location upon exiting remote
mode. See the Spectrum Master User's Guide or information in this manual on control byte #18 (12h) for further 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, setup #1 can be stored
100,000 times and setup #2 can be stored 100,000 times, etc. Because of this, the Spectrum Master does not automatically
store the changed system parameters to the EEPROM. Be aware of the EEPROM write cycle limitation when programming
the Spectrum Master and keep the number of write cycles to a minimum.
Documentation Conventions
Throughout 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).
Mode References
The term "SPA" in reference to a command denotes Spectrum Analyzer mode. All other modes are referenced individually.
2 Spectrum Master PM