Agilent Technologies N1911A Programming Manual page 780

17 IEEE 488.2 Command Reference
Parameters
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).
752
Type Description/Default
NRf A value used to set the Service Request
Enable Register.
N1911A/1912A P-Series Power Meters Programming Guide
Range of Values
0 - 255