Teledyne T100, Instruction Manual, Page: 156 / 404

Remote Operation & Advanced Features Teledyne ML - T100 UV Fluorescence SO2 Analyzer
156
5.3.1.2. CONTROL INPUTS
Control inputs allow the user to remotely initiate ZERO and SPAN calibration modes
are provided through a 10-pin connector labeled CONTROL IN on the analyzer’s rear
panel. These are opto-isolated, digital inputs that are activated when a 5 VDC signal
from the “U” pin is connected to the respective input pin.
Table 5-9: Control Input Pin Assignments
INPUT STATUS CONDITION WHEN ENABLED
A External Zero Cal
Zero calibration mode is activated. The mode field of the display will read
ZERO CAL R.
B External Span Cal
Span calibration mode is activated. The mode field of the display will read
SPAN CAL R.
C Unused
D Unused
E Unused
F Unused
Digital Ground Provided to ground an external device (e.g., recorder).
U
DC Power For Input
Pull Ups
Input for +5 VDC required to activate inputs A - F. This voltage can be taken
from an external source or from the “+” pin.
+ In5v Supply
Internal source of +5V which can be used to activate inputs when connected
to pin U.
There are two methods to activate control inputs. The internal +5V available from the
“+” pin is the most convenient method (Figure 5-24). However, to ensure that these
inputs are truly isolated, a separate, external 5 VDC power supply should be used
(Figure 5-25).
CONTROL IN
A B C D E F U
+
SPAN ZERO
Figure 5-24: Control Inputs with Local 5 V Power Supply