Status byte and service request commands
The commands to program and read the Status Byte Register and Service Request Enable Register
are listed in the table below. Note that the table includes both common commands and their script
command equivalents. For details on programming and reading registers, see Programming enable
and transition registers (on page 12-14) and Reading registers (on page 12-15).
To reset the bits of the Service Request Enable Register to 0, use 0 as the parameter value for the
command (for example, *SRE 0 or status.request_enable = 0).
Enable and transition registers
In general, there are three types of user-writable registers that are used to configure which bits feed
the register summary bit and when it occurs. The registers are identified in each applicable command
(as listed in TSP commands (on page 9-7)) as follows:
• Enable register (identified as .enable in the command listing of each attribute): Allows various
associated events to be included in the summary bit for the register.
• Negative-transition register (identified as .ntr in the command listing of each attribute): A
particular bit in the event register is set when the corresponding bit in the NTR is set, and the
corresponding bit in the condition register transitions from 1 to 0.
• Positive-transition register (identified as .ptr in the command listing of each attribute): A
particular bit in the event register is set when the corresponding bit in the PTR is set, and the
corresponding bit in the condition register transitions from 0 to 1.
Controlling node and SRQ enable registers
Attributes to control system node and service request (SRQ) enable bits and read associated
registers are summarized in the Status byte and service request enable registers (on page 12-5). For
example, either of the following commands set the system node QSB enable bit:
status.node_enable = status.QSB
status.node_enable = 8
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