Pickering 65-218 User Manual page 15

Appendix pickering
Sequencing Service and Triggering
The Sequencing service provides the user with the ability
to set a series of pre-determined sequences on an LXI
instrument. These sequences can be triggered by software
or one of the sixteen software configurable open collector
triggers.
As the operations are grouped together, it will minimize
the number of control transactions required to achieve
a composite change of target switch state, condensing
multiple operations in a single sub unit into a single
operation, thus reducing the overall system switch settling
time.
For example, if a user wants to operate X1-Y1, X4-Y1, X2-Y2,
in the first sequence, only one operation, and so delay, will
be used.
Additionally, as the switch state sequences are stored
within the LXI controller itself, the burden on the Host CPU
and Ethernet traffic is greatly reduced, and so the overall
system latency is also reduced.
0
Note: These are estimated figures, PC processing and Ethernet transmission times
Total Operate Time ~1950 µs
Example Speed of Operation Diagram For Reed Relay Based Solution
may vary depending upon the overall system setup and load.
LXI MODULAR HIGH VOLTAGE MATRIX 65-218
SECTION 1 - TECHNICAL SPECIFICATION
This unit features a software reset line which provides
the ability for a user supplied reset to be applied to the
unit, triggering a software reset of the relays, returning
all relays in the unit to their default state. There is also a
software fault line available that will be triggered if there
is any error detected within the unit. Please note that
while these reset and fault lines use dedicated physical
connections to the unit, they are software control lines and
as such should not be used for safety interlocks etc.
Speed of Operation
Speed of Operation can be important when defining
systems for test applications, therefore it can be beneficial
to understand all the necessary overhead delays
associated with a switch operation.
If we consider a single relay / block relay operation, it
can be considered to be a combination of five discrete
operations: PC Processing, Ethernet Latency, LXI
Processing / Virtualisation, Serial Loop Transmission and
Relay Settling.
A representation of these processes can be seen in the
diagram below.
1000 µs
LXI Modular High Voltage Matrix, 65-218
pickeringtest.com
2000 µs
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