Configuring the e-SAT/IN module 3-11
Setting the Initial State
The Initial State area contains three fields that enable or disable the Relay,
TTL1, and TTL2 contact closure of the e-SAT/IN module that communicates to
other devices.
Select On or Off to enable or disable the function.
Setting the Relay Operating Mode
The purpose of a ready loop configuration is to prevent the autoinjector from
making an injection when the rest of the chromatographic system (pump,
detector, or data system) is not ready to run or collect data from the next
sample.
In a ready loop configuration, devices (pump, detector, and data system) are
wired in a series circuit with the autoinjector. When a sample is running, each
device holds its ready loop event open. After the end of a run, the event is held
open until the device is ready for the next injection; when each device is ready,
it closes its own ready loop event. When all devices are ready and all ready
loop events are closed, the autoinjector senses that the ready loop circuit is
complete and proceeds with the next injection.
The Relay Event of the e-SAT/IN module can function as either a standard
programmable event or as part of the ready loop, based on your selection in
the Ready Operating Mode area. If Ready Loop is selected, no additional
programming of the relay is needed in order to function in a ready loop
architecture.
Entering events table values
Enter values in these columns to program output events for instruments
connected to the Event terminals on the e-SAT/IN module:
Time − When the event function occurs. Event rows are sorted by time.
Entries: 0.00 to 650.00 minutes.
Event − Lists the event trigger mode selected in the Initial State area.
Entries: Relay, TTL1, or TTL2.
Function − Contact closures are internally controlled by
transistor-to-transistor (TTL) logic circuits, a class of digital logic. Generally
speaking, these circuits operate on an average voltage range of 5 +
5%. A TTL
signal is defined as “low” when 0 to 0.8 V with respect to ground, and
considered “high” when greater than 3.5 V. The TTL is held high or Off in its
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