MKS 640B - The I;O Connector; Table 3: I;O Connector Pinout

Chapter Two: Installation The I/O Connecto
r
13
The I/O Connector
The Type 640B Series controller has one 15-pin, male Type “D” connector that provides the
pressure output, set point input, and trip point output signals.
I/O Connector Pinout
Pin # Assignment
1 Valve Test Point
2 Pressure Signal Output
3 Valve Close
4 Valve Open
5 Power Common
6 -15 V
7 +15 V
8 Set Point In
9 No Connection
10 Optional Input
11 Signal Common
12 Signal Common
13 Trip Point A Out
14 Trip Point B Out
15 Chassis Ground
Table 3: I/O Connector Pinout
Note
The “No Connection” pin assignment refers to a pin with no internal
connection.
Pressure Signal Output (Pin 2)
The 640B Series controller allows you to access the pressure signal from the transducer, correct it
in some way, and re-introduce it into pin 10 of the 640B Series controller to be used as the input
signal in closed-loop control. This function is useful if you need to correct for a zero offset.
Pin 2 accesses the pressure signal as it travels from the transducer to the control circuitry. Pin 10
re-introduces the signal into the 640B Series controller for use with an external sensor.