Operating Instructions Teledyne API Model T360/T360M Operation Manual
154
4.15.1.2. CONTROL INPUTS
These inputs allow the user to remotely initiate Zero and Span calibrations. Two
methods for energizing the inputs is provided below; the first using the internal
+5V available on the CONTROL IN connector and the second, if an external,
isolated supply is employed.
Table 4-24: 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.
+ Internal +5V 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 4-14, left). However, to
ensure that these inputs are truly
isolated, a separate, external 5 VDC power
supply (Figure 4-14, right) should be used.
CONTROL IN
A B C D E F U +
S
P
A
N
Z
E
R
O
CONTROL IN
A B C D E F U +
-
+
5 VDC Power
Supply
S
P
A
N
Z
E
R
O
Local Power Connections
External Power Connections
Figure 4-14: Control Inputs
