Dionex Reagent-Free Controller
90
Doc. 031880-04 1/12
C.
TTL Control
The two TTL input connectors (
Pump
and
Gradient
) on the Dionex RFC rear panel
can be connected to the TTL outputs of a controlling device (for example the
pump, combination pump/detector, or DX-120). The controlling device activates
the TTL to turn on the Dionex RFC function.
•
Activating the
Pump
TTL enables the power output to the suppressor, eluent
generator (Dionex RFC-30 only), and CR-TC (Dionex RFC-30 only). For
DX-320, DX-500, or DX-600 systems, the
Pump
TTL must be connected to
the TTL-2 output on the pump or combination pump/detector module. See
Section B.2 for installation instructions. For a DX-120 system, the
Pump
TTL
must be connected to a DX-120 adapter cable. See Section B.3 for installation
instructions.
•
Activating the
Gradient
TTL enables gradient control of the eluent generator.
Note
: This input is ignored if the
Pump
TTL is inactive.
Both TTL inputs are level sensitive. They
are inactive at +5 V and active at 0 V.
•
When the TTL is at +5 V, the controlled
function is off.
•
When the TTL is at 0 V, the controlled
function is on.
The
Gradient
TTL can also be controlled via a relay from the pump, combination
pump/detector, or detector module. For relay control, opening the relay turns on
the function and closing the relay turns off the function.
The
TTL Control/AC Control
button on the Dionex RFC rear panel selects and
deselects control of the
Pump
TTL.
•
When the button is in the
TTL Control
position, TTL control is selected and the
Pump
input works as described above.
•
When the button is in the
AC Control
position, TTL control is bypassed. The
AC
Control
position is used when a DX-120 system is connected to the Dionex
RFC via an AC cable. For additional information about AC control with a
DX-120, contact Thermo Fisher Scientific.
NOTE The
TTL Control/AC Control
button does not affect the
Gradient
TTL input.
