Formats and Data Flow 7
Keysight 53210A User’s Guide 195
Front Panel Display
Counter measurements taken from the front panel or from an IO interface appear 
in the display as indicated in Figure 7-1. See Chapter 1 for an overview of display 
features.
Reading Memory
In addition to being displayed, all counter readings are stored in the counter’s 
volatile reading memory (Figure 7-1). Memory capacity is 1,000,000 readings. 
Reading memory has the following attributes:
1 reading memory is cleared after a function change, during execution of the 
READ?, INITiate:IMMediate, or MEASure? command, after cycling power, or 
following an instrument reset (
*RST) or preset (SYSTem:PRESet).
Table 7-2 Commands Affecting Data Flow
Command
Locations 
Accessed
Readings 
Transferred
Reading Memory 
Cleared
Allowed during 
Measurement
Read?
Front Panel
Reading Memory
Output Buffer
All No No
INITiate:IMMediate
Front Panel
Reading Memory
None Yes No
FETCh?
Reading Memory
Output Buffer
All No No
R?
Reading Memory
Output Buffer
All or 
specified count
Yes Yes
DATA:REMove?
Reading Memory
Output Buffer
Specified Count Yes Yes
DATA:LAST?
Reading Memory
Output Buffer
1NoYes
MMEMORY:STORe
:DATA
Reading Memory
Internal Flash 
External USB
All No No