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
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 | Opening contact |
3 | Green | Ground — GND | Ground | Reference potential |
4 | Yellow | Digital input — Input | Input (low active): | Digital input; reference potential is ground. Note the following:
|
5 | White | Relay output — Relay_COM | Potential free | Common contact for NO and NC |
6 | Brown | Relay output — Relay_NO | Potential free | 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
Plug the 6-pin connector of the cable into the digital I/O port that you want to use.
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
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.