A measuring instrument access device, comprising: an external data interface for connecting with a public network; an internal data interface for connecting with a private network; a database; a management device; a coupling device; wherein the external data interface is configured to receive a data packet, the data packet substantially comprising a region with a command information and a region with a URL, and extract a URL and a command information from the received data packet, and to forward the extracted information (105, 106) to the management device; wherein the management device is configured to extract a field device feature of a field device (200, 200', 200", 200"') connected to the internal data interface from the external addressing information; wherein the management device is further configured to check, by querying the database, whether the command information should be forwarded to the field device (200, 200', 200", 200'") that is connected to the internal data interface; and wherein the management device is further configured to translate the field device feature into an internal addressing information of the field device (200, 200', 200", 200'"); wherein the field device feature is a fixed identifier of the connected field device (200, 200', 200", 200"'), which is connected to the field device (200, 200', 200", 200"') and which enables the connected field device (200, 200', 200", 200'") to be distinguished from other field devices (200, 200', 200", 200'"); wherein the internal addressing information of the field device (200, 200', 200", 200'") is an identifier for the location at which the field device (200, 200', 200", 200'") is located at the internal data interface, and wherein the identifier is temporarily assigned; wherein the coupling device is configured to forward the command information that should be forwarded to the field device (200, 200', 200", 200'"), which is connected to the internal data interface, to the field device (200, 200', 200", 200'") via the internal data interface by means of the internal addressing information of the field device. an external data interface for connecting with a public network; an internal data interface for connecting with a private network; a database; a management device; a coupling device; wherein the external data interface is configured to receive a data packet, the data packet substantially comprising a region with a command information and a region with a URL, and extract a URL and a command information from the received data packet, and to forward the extracted information (105, 106) to the management device; wherein the management device is configured to extract a field device feature of a field device (200, 200', 200", 200"') connected to the internal data interface from the external addressing information; wherein the management device is further configured to check, by querying the database, whether the command information should be forwarded to the field device (200, 200', 200", 200'") that is connected to the internal data interface; and wherein the management device is further configured to translate the field device feature into an internal addressing information of the field device (200, 200', 200", 200'"); wherein the field device feature is a fixed identifier of the connected field device (200, 200', 200", 200"'), which is connected to the field device (200, 200', 200", 200"') and which enables the connected field device (200, 200', 200", 200'") to be distinguished from other field devices (200, 200', 200", 200'"); wherein the internal addressing information of the field device (200, 200', 200", 200'") is an identifier for the location at which the field device (200, 200', 200", 200'") is located at the internal data interface, and wherein the identifier is temporarily assigned; wherein the coupling device is configured to forward the command information that should be forwarded to the field device (200, 200', 200", 200'"), which is connected to the internal data interface, to the field device (200, 200', 200", 200'") via the internal data interface by means of the internal addressing information of the field device.