Appendix E: Status model
Model 2657A High Power System SourceMeter® Instrument Reference Manual
E-26
2657A-901-01 Rev. B/December 2012
TSP-Link system status
The TSP-Link
®
expansion interface allows instruments to communicate with each other. The test
system can be expanded to include up to 32 TSP-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
TSP-Link system expansion interface
(on page 6-49)
for details about the TSP-Link system.
The system summary registers, shown in the
Status byte and service request enable registers
System summary and standard event registers
(on page E-7), are shared by all
nodes in the TSP-Link system. A 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 byte and service request
(on page E-15) for details.
Status model configuration example
In this example, a current limit (compliance) event in SMU A of node 15 will set the RQS bit of the
Status Byte of the master node. The commands to configure the status model for this example are
provided in
Status configuration (enable) commands
When a current limit (compliance) condition occurs in SMU A of Node 15, the following sequence of
events will occur:
•
Node 15: Bit B1 of the Measurement Event Current Limit Summary Register sets when the
current limit (compliance) event occurs.
•
Node 15: Bit B1 (ILMT) of the Measurement Event Register sets.
•
Node 15: Bit B0 (MSB) of the Status Byte sets.
•
System Summary Registers: Bit B1 (Node 15) of the System Summary Register 2 sets.
The System Summary Registers are shared by all nodes in the TSP-Link system. When a bit in a
system register of node 15 sets, the same bit in the master node system register also sets.
•
System Summary Registers: Bit B0 (Extension) of the System Summary Register sets.
•
Master Node: Bit B0 (MSB) of the Status Byte sets.
•
Master node: With service request enabled, bit B6 (RQS) of the Status Byte sets. When your
program performs the next serial poll of the master node, it will detect the current limit event and
can branch to a routine to service the request.
Status configuration (enable) commands
(on page E-27) demonstrates the flow of
information through the status model of node 15 and the master node.
NOTE
Summary of Contents for 2657A
Page 3: ......
