Racal Instruments 2251A Operator's Manual page 57

Table 3.20 - Alphabetical List of 2251A Command Codes (continued)
CODE
FT
*IDN?
IP
MD
ME
NA
NW
*OPC
*OPC?
*OPT?
PA
PH
PW
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
R0
R1
R2
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Selects Fall Time A measurement mode
Identification Query, response is a ID string.
Instrument Preset. Sets the 2251A to its power-up (Default) state. Refer to
Table 3-1 for further details of the power-up state.
Disables Math function (Default)
Enables Math function
Disables 100 Sample Averaging mode
Selects Negative pulse width A measurement mode
Operation Complete, sets Op Complete bit of the ESR
Query for when all operations are complete, response = 1
Query for Channel C option installed, 0 = no, 1 = yes
Selects Period A measurement mode
Selects Phase A relative to B measurement mode
Selects Positive Pulse Width A measurement mode
SRQ assertion UNCONDITIONALLY inhibited
SRQ assertion upon error detection
SRQ asserted for measurement ready
SRQ asserted for measurement ready or error detection
SRQ asserted for frequency standard change
SRQ asserted for frequency standard change or error detection
SRQ asserted for frequency standard change or measurement ready
SRQ asserted for frequency standard change or error detection or measurement
ready.
External arm input Receiver on backplane connector P2 A 23 TTLTRG0
Enable external arm input on backplane connector P2 C 23 (TTLTRG1)
Enable external arm input on backplane connector P2 A 24 (TTLTRG2)
RESPONSE