
Operating Instructions
Model 300E Carbon Monoxide Analyzer
Instruction Manual
88
P/N 04288 REV: A
Table 6–13: Control Input Pin Assignments
Input #
Status
Definition
On Condition
A
REMOTE ZERO
CAL
The Analyzer is placed in Zero Calibration mode. The mode
field of the display will read
ZERO CAL R.
B
REMOTE
SPAN CAL
The Analyzer is placed in Span Calibration mode. The mode
field of the display will read
SPAN CAL R.
C SPARE
D SPARE
E SPARE
F SPARE
Digital Ground
May be connected to the ground of the datalogger/recorder.
U
DC power for
Input pull ups
Input pin for +5 VDC required to activate pins A – F. This
can be from an external source or from the “+” pin of the
instruments STATUS connector.
+
In5V
Supply
Internal source of +5V which can be used to actuate control
inputs when jumpered to the U pin.
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 6–5: Control Inputs