2-12 Preparing the Autosampler
Controlling I/O connections
The instrument has one I/O connector, which supports TTL inputs (active low)
and contact closure output.
Defining TTL inputs
TTL inputs allow other devices to control the instrument. Following are
options for the instrument’s two TTL inputs, which you define via the
instrument method (click Instrument Method Editor > W2707 > Events >
Inputs):
• Hold Inject (default) – When this input is active before the start of an
analysis, the instrument performs all programmed preinjection sample
handling (sample loop) but waits to inject the sample until the input
becomes inactive. If the input becomes active during an analysis, it has
no effect until the next analysis is started.
• Stop Inject – Aborts the run immediately.
Explaining contact closure output
Requirement: Route an Inject Start I/O cable to any non-Ethernet or
non-Waters device that requires an injection trigger signal. Waters
IEEE detectors, such as the 2487 UV/Vis and 2996 PDA, require this I/O
cable connection.
Tip: Some Waters Ethernet instruments, like the 2489 UV absorbance
and 2998 PDA detectors, start remotely through the Ethernet and
require no Inject Start I/O connections.
Caution: Connect this instrument only to other instruments that meet
relevant safety standards.
I/O connector—Contact closure output and TTL inputs
Pin number Description Cable color
1 Inject Start White
2 Inject Start Green
3 Input 1 Red
4 Input 2 Black
To Next Page
Loading...
