1 configuration of mp1777a status registers, Condition transition event, Register filter register – Anritsu MP1777A User Manual
Page 64: Event enable register, Summary message
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6.1 Configuration of MP1777A Status Registers
Status registers excluding the registers specified by IEEE488.2 are configured as follows.
Condition
Transition
Event
register filter
register
Event enable
register
Summary Message
Fig. 6-2 Block Diagram of each Status Register
Table 6-1 Definitions of Register and Filter
Register and Filter
Definition
Condition register
Monitors the device status and performs real-time change in accordance w'ith the device
status.
-
For this reason, this register does not store the status.
Transition filter
Sets the condition register details to the event register.
-
The transition filter comes in three modes, depending on the changes of the condition regis
ter to be evaluated.
Positive direction change; The event becomes true only when the corresponding condition
changes from false to true.
Negative direction change; The event becomes true only when the corresponding condition
changes from true to false.
Both direction change; The event becomes true when a change into the positive or
negative direction takes place.
-
Event register
Stores the output of the transition filter.
Event enable register
Selects the bit of corresponding Event Register to trigger a shift of summary message to true.
6-3
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