Table 5-9: Control Input Pin Assignments - Teledyne T100 Instruction Manual

Remote Operation & Advanced Features
5.3.1.2. CONTROL INPUTS
INPUT
A External Zero Cal
B External Span Cal
C
D
E
F
Digital Ground
DC Power For Input
U
+ Internal +5v Supply
156
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

STATUS
Zero calibration mode is activated. The mode field of the display will read
ZERO CAL R.
Span calibration mode is activated. The mode field of the display will read
SPAN CAL R.
Unused
Unused
Unused
Unused
Provided to ground an external device (e.g., recorder).
Input for +5 VDC required to activate inputs A - F. This voltage can be taken
from an external source or from the "+" pin.
Pull Ups
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).
Figure 5-24:
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
CONDITION WHEN ENABLED
CONTROL IN
A B C D E F
Control Inputs with Local 5 V Power Supply
+
U