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Instruction Manual
3.2.2 Connector
Good, recommended practice is to remove power from any cable prior to connecting or disconnecting it.
1) The CCM502 is provided with one 9-pin D-sub male connector used for the I/O interface. Fabricate a cable to
connect to the vacuum gauge as shown below:
3.2.3 Connectors pin-out
9-pin D-sub (DE-9P) male connector (used for analog output and digital I/O)
PIN NUMBER
PIN DESCRIPTION
1
Sensor enable (HV On/Off) - Low active digital input
The high voltage to anode is turned on and cold cathode sensor is activated by applying a continuous
ground. The sensor is turned off by removing the ground. See
activating the sensor.
2
Power common GND
3
Analog output (Log-Linear 0 to 8 Vdc, 1 V/decade)
4
Power Input (14.5 to 30 Vdc, 2 W) protected against power reversal and transient over-voltages
5
Not assigned
6
Do not connect
7
Analog output common (Do not use for sensor enable ground)
8
Not assigned
9
Sensor on/off status is determined by open collector transistor (ground emitter) rated at 30 V max. V
, 100 mA max. I
* Applying continuous ground activates the cold cathode sensor.
InstruTech
Transistor off = Sensor off, Transistor on = Sensor on
C.
Wiring Diagram
CCM502 Hornet
section 4.3
for other methods of
CE
Page 12
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