Instruction Manual WGM701 Wasp
InstruTech
Page 12
3.2.2
Connector
Good, recommended practice is to remove power from any cable prior to connecting or disconnecting it.
1) The WGM701 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
Connector pin-out
9-pin D-sub (DE-9P) male connector (used for analog output and digital I/O)
PIN NUMBER
PIN DESCRIPTION
1
Not assigned
2
Power common GND
3
Analog output (Log-Linear 0.5 to 7 Vdc, 0.5 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
Cold cathode sensor on/off status is determined by open collector transistor (ground emitter) rated at
30 V max. V
CE
, 100 mA max. I
C.
Transistor off = Sensor off, Transistor on = Sensor on
Wiring Diagram
* Does not apply to WGM701. Pin 1 is not assigned. Digital input to gauge is not required as high voltage for cold cathode
sensor is turned on automatically once measurements from pirani has indicated low enough pressure level.
