4 Channel Serial Server RS485 RS232 RS422 to Ethnernet NB144S TCP UDP MQTT HTTP Modbus TCP- RTU Gateway Watchdog

industrial design for stability and reliability, with high levels of port protection. rich LED status indicators for quick location of device operating status.support for Phoenix terminal or DC header power supply, DC 8-28V wide voltage input, support for reverse connection protection. Support for terminal type interface (RS485/RS422) and standard DB9 interface (RS232).
baud rate support 2400 to 115200bps, support multiple checksum methods. supports multiple registration packets and heartbeat packet sending, such as connection to send MAC, connection to send customization, etc. supports stable and reliable configuration of the upper computer and AT command, and the four channels are independently configured without affecting each other. supports DNS domain name resolution, with configurable domain name resolution servers.
Supports multiple operating modes TCP client, TCP server, UDP client, UDP server, MQTT client, HTTP client client. enables 4-way server mode at the same time, supports 12 clients with dynamically assigned access, and a single server supports 13 clients with access supports memory mode UDP server mode, recording the UDP address of the last communication for the destination address of the next communication.supports DHCP dynamic acquisition of IP, subnet mask, default gateway, DNS server address.
Supports a variety of Modbus gateways for active reporting of RTU devices and interchange between Modbus TCP and Modbus RTU protocols. can be configured to automatically collect device data in a stored mode, or use a one-question-and-answer multi-host mode. supports MQTT gateway functionality for fast access to AliCloud and standard MQTT3.1.1 servers (OneNET.). Support for Modbus data active upload to TCP transparent transport servers, MQTT servers and other servers
Supports HTTP client mode, using the HTTP/1.1 protocol, configurable as GET and POST requests can communicate directly using TCP/IP or via a "virtual serial" connection rich independent status LEDs for link, network, data sending and receiving, etc. supports firmware upgrade or firmware switchover from the host PC via UDP or the serial port.