How Moxa's NPort Serial Device Networking Server optimizes serial-to-Ethernet communication and solves the communication pain points of different scenarios in intelligent transportation.
Controllers and sensors deployed on both sides of the road collect traffic and environmental conditions, but these devices are far from each other and must communicate with the traffic control center to provide real-time traffic data. At the same time, the traffic control center must also provide real-time traffic information to pedestrians and vehicles. In the process of collecting on-site data for large-scale use and extracting useful information for pedestrians and vehicles, different usage programs may announce multiple serial port data pleas, resulting in incidents and prolonged response times.
Moxa's NPort supports TCP servers, which are typically used for long-distance monitoring and are connected to field sensors (e.g., traffic controllers, road sensors), and other types of devices. The central system with the TCP client program in the control center only needs to initiate contact with the NPort and establish a connection to receive the serial port data of the field device. The TCP server form supports the maximum connection function, which can ensure that multiple hosts can collect serial port data from the same field device together when they contact NPort together. However, this function also comes with the risk of multiple command data conflicts. To this end, we plan a command-by-instruction function, which allows NPort to store the instructions announced by each host on the Ethernet network in the buffer, and then send the instructions to the serial port in a first-in, first-out (FIFO) order. When a field device responds, NPort also saves the echo to a buffer before sending it to the host that announces the corresponding command.
If the host actively establishes a TCP connection, that is, NPort passively waits for the client to connect as a TCP server, NPort will not be able to identify whether the network is down, and the connection will continue to run after the connection is interrupted. As a result, even if the network connection is restored, the client will not be able to reconnect to the NPort because the resources are consumed. In order to save personnel from restarting NPort in person to release resources and time costs, NPort adds the TCP Alive Check timeout function, which can regularly check the TCP/IP connection status and display the Ethernet connection status, providing a fail-safe mechanism for network disconnection
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