Event Status And Event Status Enable Registers - Fluke 45 User Manual

45
Users Manual

Event Status and Event Status Enable Registers

The Event Status Register (ESR) assigns specified events to specific bits (see Figure 5-4
and Table 5-6). When a bit in the ESR is set (i.e., 1), the event that corresponds to that bit
has occurred since the register was last read or cleared. For example, if bit 3 (DDE) is set
to 1, a device-dependent error has occurred.
The Event Status Enable Register (ESE) is a mask register that allows the host to enable
or disable (mask) each bit in the ESR. When a bit in the ESE is 1, the corresponding bit
in the ESR is enabled. When any enabled bit in the ESR changes from O to 1, the ESB bit
in the Status Byte Register also goes to 1. When the ESR is read (using the *ESR? com-
mand) or cleared (using the *CLS command), the ESB bit in the Status Byte Register
returns to 0.
Summary Message
Event Summary Bit (ESB)
(Bit 5 of Status Byte Register)
Figure 5-4 reprinted from ANSI/IEEE Std 488.2-1987. Copyright 1988. By the Institute of Electrical and Electronics Engineers, Inc. By
permission of the IEEE Standards Department .
5-16
7 6 5 4 3
&
&
&
&
&
6
7 5 4 3
Figure 5-4. Event Status and Event Status Enable Registers
Standard
2 1
0
Event Status Register
&
&
&
Standard
2 Event Status Enable
1 0
Register
*ESE *ESE?
*ESR?
aam22f.eps