Model 100E Instruction Manual Operating Instructions
045150102 Rev XB1 91
Table 6-14: Status Output Pin Assignments
Connector
Pin
Status Condition (ON=conducting)
1 SYSTEM OK ON if no faults are present.
2 CONC VALID ON if concentration measurement is valid, OFF when invalid.
3 HIGH RANGE ON if unit is in high range of any AUTO range mode.
4 ZERO CAL ON whenever the instrument is in ZERO calibration mode.
5 SPAN CAL ON whenever the instrument is in SPAN calibration mode.
6 DIAG MODE ON whenever the instrument is in DIAGNOSTIC mode.
7 LOW RANGE ON if unit is in low range of any AUTO range mode.
8 Unused
D EMITTER BUS
The emitters of the transistors on pins 1-8 are bussed
together. For most applications, this pin should be connected
to the circuit ground of the receiving device.
+ DC POWER
+ 5 VDC source, 30 mA maximum (combined rating with
Control Inputs)
DIGITAL
GROUND
The ground from the analyzer’s internal, 5/±15 VDC power
supply.
6.8.2. 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 6-15: 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
EXTERNAL LOW
SPAN CAL
Low span (mid-point) calibration mode is activated. The mode
field of the display will read LO CAL R.
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.
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