IEEE-488 Reference
3-37
The Service Request Enable Register is shown in Figure 3-16. 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:
*SSE 34
where; ESB (bit B5) = Decimal 32
MAV (bit B4) = Decimal 16
<NRf> = 48
The contents of the Service Request Enable Register can be read using the *SRE? query com-
mand.
PRINT #1, "output 16; *sre 32; *sre?" ' Unmask ESB bit and query register
PRINT #1, "enter 16" ' Send response message to 2002
Program fragment
Figure 3-16
Service Request Enable Register
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 MAV QSB EAV
0/1 0/1 0/1 0/1
128 16 8 4
MSB
1
0/1
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