User manual

IEEE-488 Reference
2001-900-01 Rev. K / August 2010 4-47
The Service Request Enable Register is shown in cáÖìêÉ=QJNT=. Notice that the decimal weight
of each bit is included in the illustration. The sum of the decimal weights of the bits that you
wish to set is the value that is sent with the *SRE command. For example, to set the ESB and
MAV bits of the Service Request Enable Register, send the following command:
*SRE 34
where; ESB (bit B5) = Decimal 32
MAV (bit B4) = Decimal 16
parameter = 48
The contents of the Service Request Enable Register can be read using the *SRE? query com-
mand (see next paragraph).
Programming Example OUTPUT 716; “*SRE 32” ! Set ESB bit
4.10.13 *SRE?  service request enable query
Purpose To read the contents of the Service Request Enable Register.
Format *SRE?
Description The *SRE? command is used to acquire the value (in decimal) of the Service Request Enable
Register. The binary equivalent of the decimal value determines which bits in the register are
set. When the *SRE? query command is sent, the decimal value is placed in the Output Queue.
When the Model 2001 is addressed to talk, the value is sent from the Output Queue to the
computer.
For example, for an acquired decimal value of 17, the binary equivalent is 00010001. This bi-
nary value indicates that Bits 4 and 0 of the Service Request Enable Register are set (see previ-
ous paragraph).
B7 B6 B5 B4 B3 B2 B1 B0
(2 )
7
(2 )
5
(2 )
4
(2 )
3
(2 )
2
(2 )
0
32
0/1
Bit Position
Event
Decimal Weighting
Value
Value : 1 = Enable Service Request Event
0 = Disable (Mask) Service Request Event
Events : OSB = Operation Summary Bit
ESB = Event Summary Bit
MAV = Message Available
QSB = Questionable Summary Bit
EAV = Error Available
MSB = Measurement Summary Bit
OSB ESB MA QSB EAV
0/1 0/1 0/1 0/1
128 16 8 4
MSB
1
0/1
cáÖìêÉ=QJNT
Service Request Enable Register