Keysight N1911A Programming Manual page 748

17 IEEE 488.2 Command Reference
Parameters
Type
NRf
Query
*SRE?
The query returns the contents of bits 0 to 5 and bit 7 of the Service Request
Enable Register. The format of the return is <NR1> in the ranges of 0 to 63 or 128
to 191 (that is, bit 6 is always 0).
748
Description/Defaul t
A value used to set the Service Request Enable Register.
N1911A/1912A P-Series Power Meters Programming Guide
Range of Values
0 - 255