Brooks Instrument XacTorr CMX160 - Manual (Page 30)

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3.8 ELECTRICAL SIGNAL DESCRIPTION
Table 6: Electrical Signals Descriptions
Signal Description Notes
+ 15 VDC Positive power supply input for the CMX. Wire size should be selected to minimize
the voltage drop between the power source
and the CMX.
-15 VDC Negative power supply input for the CMX.
Chassis ground
This pin connects to the system chassis ground
when the CMX is mounted.
The shield in the cable should be connected
to this pin to eliminate the possibility of radio
frequency interference (RFI) affecting the
output signal from the device.
Signal common Pressure output reference return signal.
This should be used as the reference signal
to avoid any ground return potentials
developed in the External Power Supply
Common, described below.
Signal output
A differential voltage developed between the
Signal Out pin and the Signal Common pin.
This signal voltage has a maximum
differential output of +10 VDC at the rated
full scale pressure of the CMX. The output
signal voltage is linearly proportional to
pressure. Cable used for this signal should
be shielded, and the shield should be
connected to the chassis ground.
External Power
Supply Ground
Power supply ground return line.
Wire size should be selected to minimize
the voltage drop between the power source
and the CMX.
Temperature
status
Reports the status of the internal heater by
remaining low (0V DC) until the CMX reaches
the control temperature, at which time the signal
goes to 5V DC. Remains at 5V DC as long as the
temperature stays at the control temperature.
All CMXs are heated.
No Connection No internal connection.
Remote ZERO
trigger
Input that will activate zeroing. 1 This pin is driven high to 3.3V DC.
Relay (x)
Normally OPEN
Relay normally open contact. Normal state is de-energized.
Relay (x)
Common
Relay common contact.
Connects to normally open or normally
closed contact depending on relay state.
Relay (x)
Normally
CLOSED
Relay normally closed contact. Normal state is de-energized.
1 See page 20 Figure 21, Pin #3, Connector Option 2 for remote zero parameters.
3.0
_INSTALLATION