IEEE-488 Reference
5-10
The filter can be programmed for positive transitions (PTR),
negative transitions (NTR) or both. When an event bit is pro-
grammed for a positive transition, the event bit in the Opera-
tion Event Register will set when the corresponding bit in the
Operation Event Condition Register changes from 0 to 1.
Conversely, when programmed for a negative transition, the
bit in the status register will set when the corresponding bit
in the condition register changes from 1 to 0.
The individual bits of the transition filter registers can be set
or cleared by using the following SCPI commands:
:STATus:OPERation:PTR <NRf>
:STATus:OPERation:NTR <NRf>
The transition filter registers can be read at any time by using
the following SCPI query commands:
:STATus:OPERATION:PTR?
:STATus:OPERation:NTR?
Reading a transition filter register using the above query
commands does not affect the contents of the register.
The following operations will set (1) all the bits of the PTR
register and clear (0) all the bits of the NTR register:
1. Cycling power.
2. Sending the :STATus:PRESet command.
3. Sending the :STATus:OPERation:PTR 65535 and :STA-
Tus:OPERation:NTR 0 commands.
Operation Event Register —
This is a latched, read-only
register whose bits are set by the Operation Condition Reg-
ister and Transition Filter. Once a bit in this register is set, it
will remain set (latched) until the register is cleared by a spe-
cific clearing operation. The bits of this register are logically
ANDed with the bits of the Operation Event Enable Register
and applied to an OR gate. The output of the OR gate is the
Operation Summary Bit (OSB) that is applied to the Status
Byte Register. The following SCPI query command can be
used to read the Operation Event Register:
:STATus:OPERation?
Reading this register using the above SCPI command clears
the register. The following list summarizes all operations that
will clear the Operation Event Register:
1. Cycling power.
2. Sending the *CLS common command.
3. Sending the :STATus:OPERation:EVENt? query com-
mand.
Operation Event Enable Register —
This register is pro-
grammed by the user and serves as a mask for the Operation
Event Register. When masked, a set bit in the Operation
Event Register will not set the Operation Summary Bit
(OSB) in the Status Byte Register. Conversely, when un-
masked, a set bit in the Operation Event Register will set the
OSB bit.
A bit in the Operation Event Register is masked when the
corresponding bit in the Operation Event Enable Register is
cleared (0). When the masked bit of the Operation Event
Register sets, it is ANDed with the corresponding cleared bit
in the Operation Event Enable Register. The logic “0” output
of the AND gate is applied to the input of the OR gate and
thus, will not set the OSB bit in the Status Byte Register.
A bit in the Operation Event Register is unmasked when the
corresponding bit in the Operation Event Enable Register is
set (1). When the unmasked bit of the Operation Event Reg-
ister sets, it is ANDed with the corresponding set bit in the
Operation Event Enable Register. The logic “1” output of the
AND gate is applied to the input of the OR gate and thus, will
set the OSB bit in the Status Byte Register.
The individual bits of the Operation Event Enable Register
can be set or cleared by using the following SCPI command:
:STATus:OPERation:ENABle <NRf>
The following SCPI query command can be used to read the
Operation Event Enable Register:
:STATus:OPERation:ENABle?
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