The digital I/O ports (Dig I/O) can be used to exchange digital signals with external devices. Each port provides:

  • one digital input

  • one relay output

Pin Assignment

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

Prerequisites

To use the digital I/O functionality, the following must be fulfilled:

  • The digital I/O port is connected to the external device with the digital I/O signaling cable.

  • The inputs and outputs that you want to use are selected in the Instrument Configuration Manager.

Connecting a Digital I/O Port

  1. Plug the 6-pin connector of the cable into the digital I/O port that you want to use.

  2. For each relay output or digital input to be used, connect the appropriate signal wire and ground wire to the corresponding connectors on the external device. For details, refer to the documentation provided with the external device.

Selecting the inputs and outputs in the chromatography data system

  1. In the dialog box for the device, on the Inputs and Outputs pages, select the inputs and outputs that you want to use. The numbering in the dialog box corresponds to the numbers on the port.