Controlling Node And Srq Enable Registers; Tsp-Link System Status; Status Model Configuration Example - Keithley 708B Reference Manual

Models 707B and 708B Switching Matrix Reference Manual
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 Instrument
Control Library command table and defined as follows:
•
Enable register (identified as .enable in each attributes command listing): allows various
associated events to be included in the summary bit for the register.
•
Negative-transition register (identified as .ntr in each attributes command listing): a particular
bit in the event register will be 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 each attributes command listing): a particular bit
in the event register will be 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 SRQ enable bits and read associated registers are summarized
in the Status register sets which are summarized in the
For example, either of the following will set the system node QSB enable bit:
status.node_enable = status.QSB
status.node_enable = 8

TSP-Link system status

The TSP-Link is an expansion interface that allows the instruments to communicate with each other.
The test system can be expanded to include up to 32 TSP-Link enabled instruments. In a TSP-Link
system, one node (instrument) is the master and the other nodes are the subordinates. The master
can control the other nodes (subordinates) in the system. See
test scripts (on page 6-45) for details on the TSP-Link.
The system summary registers, shown in
summary bit (System register)
status event that occurs at a subordinate node can generate an SRQ (service request) in the master
node. After detecting the service request, your program can then branch to an appropriate subroutine
that will service the request. See

Status model configuration example

The following example illustrates the status model configuration for a TSP-Link system. In this
example, a Node 15 thermal aspect event will set the RQS bit of the Status Byte of the master Node.
707B-901-01 Rev. A / August 2010
Status Byte register overview
(on page C-5), are shared by all nodes in the TSP-Link system. A
Status byte and service request (SRQ)
Appendix C: Status model
Status Byte register overview
TSP-Link system and running parallel
(on page C-4) and
(on page C-15) for details.
(on page C-4).
System
C-19