--- title: "Modbus Gateway | Configuration | N3uron KB V1.22" slug: "modbus-gateway-configuration" description: "Modbus Gateway is a N3uron module designed to increase the number of simultaneous connections to Modbus devices whose available connections are restricted" updated: 2025-12-23T13:51:06Z published: 2025-12-23T13:51:06Z --- > ## 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). ## Module Configuration ![Figure 1- Channel Creation](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%201-%20Channel%20Creation.png)Figure 1. Channel Creation As shown in the previous screenshot, multiple connections****can be created in the Model Panel by clicking on the burger menu icon. Each connection is named **Channel**. See below for an explanation of the different configuration options. ## Channel Configuration A channel represents the physical medium of connecting one device. Each channel has the following parameters: - **Data collection:** When disabled, the connection will remain inactive. The default value is set to Enabled. - **Timing:** - **Request Timeout:** Maximum amount of time to wait for a valid response, displayed in milliseconds. The valid range is 100ms to 600,000ms. The default value is set to 3,000ms. - **Inter-request Delay:** Delay before sending subsequent requests to the target device, displayed in milliseconds. The valid range is 0ms to 600,000ms. The default is 0ms.**** - **Connection:** - **Type:** Specifies the connection type that will be established: - **TCP** - **Serial** When connecting via**TCP,** the following options are displayed: - **Modbus Mode:**Specifies the Modbus working mode: - **TCP:**Modbus TCP. - **RTU encapsulated:**Modbus RTU encapsulated over TCP. - **Config** - **Host:** Hostname or IP address of the target device. - **TCP port:**Determines which TCP Port to connect to. Valid values range from 1 to 65535. - **Reconnect delay:**Time before trying to re-open the connection after a failed attempt, displayed in milliseconds. The minimum value is 1,000ms. Whereas, **Serial**channels include the following available options: - **Modbus Mode:**Specifies the Modbus working mode. In this case, there is only one option: - **RTU:**Modbus RTU. - **Config** - **Port name:**Serial port as displayed by the operating system. For example, if **N3uron** is running on Windows, valid port names would be COM1, COM2, and so forth. If running on Linux, valid port names would be /dev/ttyS0, /dev/ttyS1, and so forth. - **Reconnect delay:** Time before trying to re-open the serial port after a failed attempt, displayed in milliseconds. The minimum value is 1,000ms. - **Port settings:** - **Baud rate:** Serial port transfer speed in milliseconds. Valid values are 110, 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, or 115200. - **Data bits:**Specifies the number of data bits per data word. Valid values are 5, 6, 7, or 8. - **Stop bits:**Specifies the number of stop bits per data word. Valid values are 1 or 2. - **Parity:**Specifies the type of parity for data. Valid values are None, even, mark, odd, or space. - **Flow Control:** Enables the use of RTS and DTR control lines. There are 3 options: None, RTS/CTS (RS232), and RTS (RS485/RS422). - **Buffer size:**Specifies the Serial communication buffer capacity. The valid range is 128 to 65536. ## TCP Server Configuration Regardless of the type of connection, Serial or TCP, a device (Channel) can have as many TCP Servers as needed. As shown in the image below, to create a new TCP Server click on the ellipsis button and select **New TcpServer**. ![Figure 2- TCP Server configuration](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%202-%20TCP%20Server%20configuration.png)Figure 2. TCP Servers creation Available configuration options for **TCP Servers** include: - **TCP Port:**Specifies the port number for incoming connections. The valid range 1 to 65535, the default value is 3005. Note:Make sure the port number is not used by any other application. - **Network Interface:** Specifies the interface via which the **TCP Server** will be accessible. If set to 0.0.0.0, the **TCP Server** will listen to connections on all interfaces. If set to 127.0.0.1 or localhost, the **TCP Server** will only listen to local applications. In addition to the above options, the IP address for a specific network interface can also be set to only allow connections from that interface. Note:In order to allow incoming connections from a specific network card, users will need to enter its IP address. - **Modbus Mode:** Defines the connection mode. The available options are: - TCP - RTU encapsulated - **Priority:** The priority of this **TCP Server** over the rest of **TCP Servers**on this channel. The valid range is 1 (highest priority) to 10 (lowest priority). The priority must be different for each gateway sharing the same channel. The default value is 1. - **Max. connections:** The maximum number of TCP clients supported by this server. Set to 0 to disable the limit. ![Figure 3- TCP Connection Configuration](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%203-%20TCP%20Connection%20Configuration.png)Figure 3. TCP connection configuration ![Figure 4- Serial connection configuration](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/Figure%204-%20Serial%20connection%20configuration.png)Figure 4. Serial connection configuration