--- title: "DNP Server | Configuration | N3uron KB V1.22" slug: "dnp-server-configuration" description: "DNP Server is a N3uron module designed to provide enhanced connectivity for all devices and third-party applications requiring DNP3 communications…" updated: 2025-12-23T13:52:07Z published: 2025-12-23T13:52:07Z canonical: "docs.n3uron.com/dnp-server-configuration" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.n3uron.com/llms.txt > Use this file to discover all available pages before exploring further. # Configuration Note:Before starting configuration, a new module instance must be created. [Click here for more information about creating Module instances](/v122/docs/platform-create-new-module-instance). ## Channel Configuration New channels can be created by selecting the **DNP3 Server******instance from the Explorer tree menu.![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/05-Creating-new-DNP-Server-communication-channels.png) A channel represents the physical medium to which one or more slave devices can be linked. Each channel requires the following parameters to be configured: ![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%206-%20DNP%20Server%20settings.png) - **Enable data collection:**When disabled, the channel will remain inactive. The default value is set to Enabled. - **Application data length:**The size of the application data buffer to be sent in a single transaction. The valid range is 1 to 65535. The default value is 2048.**** - **Server:** - **TCP port:** TCP port for incoming connections. The valid range is 1 to 65535 and the default port number is 20000. This port may not be used by any other application on the same machine. - **Network interface:** Specifies the interface via which the **DNP3****Server** will be accessible. If set to All interfaces, the **DNP3****Server** will listen to connections on all interfaces. If set to Localhost only, the **DNP3****Server** will only listen to localhost connections. In addition to the above options, the IP address for a specific network interface can also be set to only allow connections from its own network. - **Max connections:**The maximum number of TCP clients supported by this server. Only 1 permitted. - **Source IP addresses:**Allows IP addresses to be whitelisted for incoming connections. Several IP addresses can be permitted using a comma-separated list. No restrictions are applied when left empty. - **Inter-frame delay:**Time to wait between one frame and the next when sending multi-frame messages, displayed in milliseconds. The valid range is 0ms to 1,000ms, the default is 10ms. ## Device Configuration Each channel can have one or multiple devices. ![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%207-%20Creating%20a%20new%20device.png) ![](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%208-%20Device%20configuration.png) Device configuration settings contain the following options: - **Enable data collection:** Enables or disables data collection on the specified device. When disabled, all requests will be discarded and no data will be sent back to the master. - **Slave address:** Specifies the 16-bit address of the slave outstation. The valid range is 0 to 65535. The default value is 1. - **Master addresses:** In **DNP3**, each device must have a unique 16-bit address. This parameter specifies the **DNP3** master address. The 16-bit address of the master station(s) allowed to communicate with this device. The valid range is 0 to 65535. The default value is 0. - **Event buffer:** - **Class-1 size:**The size of the event buffer for Class-1 events. Set to 0 to disable. The default value is 1000. - **Class-2 size:** The size of the event buffer for Class-2 events. Set to 0 to disable. The default value is 1000. - **Class-3 size:**The size of the event buffer for Class-3 events. Set to 0 to disable. The default value is 1000. - **Discard:**The type of events to discard when a buffer reaches its max size. If set to Oldest, the **DNP3****Server** will discard the oldest events. If set to Most Recent, the **DNP3****Server** will discard the most recent events. - **Require confirmation:**Request the master to send a confirmation message after receiving and processing each set of events. The slave will wait for a valid confirmation in order to delete the set of events from the buffer. ![09-Event-buffer](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/09-Event-buffer.png) - **Map groups:** - **Tag maps:** - **Tag:** Target tag to obtain updates from and send write requests to. - **DNP data point:** - **Index:**Specifies the****DNP index. The valid range is 0 to 4294967295. The default value is 0.******** - **Event class:**Available options are Class-0 (static), Class-1, Class-2, and Class-3. ![09-Tag-map-creation](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/09-Tag-map-creation.png) The available groups and variations are shown in the following table: | **Object Description** | **Object Type** | **Variations** | | --- | --- | --- | | Binary Inputs | 01 | 1: 8-bit-packed format 2: 8-bit with flag | | Double-bit Inputs | 03 | 1: 8-bit-packed format 2: 8-bit with flag | | Binary Outputs | 10 | 1: 8-bit-packed format 2: 8-bit with flag | | Analog Inputs | 30 | 1: 32-bit with flag 2: 16-bit with flag 3: 32-bit without flag 4: 16-bit without flag 5: 32-bit floating-point with flag 6: 64-bit floating-point with flag | | Analog Outputs | 40 | 1: 32-bit with flag 2: 16-bit with flag 3: 32-bit floating-point with flag 4: 64-bit floating-point with flag | ****[Embedded content](https://www.youtube.com/embed/-mwa4i4pVuM?&wmode=opaque&rel=0)