The digital I/O ports (Dig I/O) can be used to exchange digital signals with external instruments, for example, a mass spectrometer. Each port provides:

  • one digital input

  • one relay output

Digital I/O port
Figure: Digital I/O port

Pin

Description — Signal Name

1

Not used

2

Relay output — Relay_NC (Normally Closed contact)

3

Ground — GND

4

Digital input — Input

5

Relay output — Relay_COM

COM is the common contact for NO and NC. If the relay is not activated or if the device is turned off, the connection is between COM and NC. If the relay is activated, the connection is between COM and NO.

6

Relay output — Relay_NO (Normally Open contact)

The next table lists the functions assigned to the connector pins and the color of the cable wire connected to each pin.

Pin

Wire Color

Signal Name

Signal Level

Remarks

1

Pink

 

 

Not used

2

Gray

Relay output — Relay_NC

Potential free
0-24 V, 0-100 mA

Opening contact

3

Green

Ground — GND

Ground

Reference potential

4

Yellow

Digital input — Input

Input (low active):
On: 0-0.4 V
Off: 2.2-5 V
Pull-up resistor: 47 kΩ to 5 V

Digital input; reference potential is ground. Note the following:

  • The maximum input voltage at the input must not exceed +5 V with reference to ground.

  • The minimum input voltage must not be lower than the ground potential.

5

White

Relay output — Relay_COM

Potential free

Common contact for NO and NC

6

Brown

Relay output — Relay_NO

Potential free
0-24 V, 0-100 mA

Closing contact