[Interface signal]：RS485
[Operating voltage]：DC 8～28V
[Size]：40*111*119.4mm
[Introduction]：The NA281S is a rail-mounted multi-serial port server series independently developed by EBYTE. It integrates a TCP/IP protocol stack, enabling bidirectional transparent data transmission from serial to Ethernet ports, Modbus protocol conversion, and serial device cloud access. Its industrial design ensures stability in harsh working environments, and rich indicator lights provide feedback on different operating states. It supports host computer, AT command, and web page configuration, allowing for easy networking and cloud access for serial devices with simple configuration. It is widely used in industries such as data center monitoring, environmental monitoring, intelligent transportation, gate control, and smart parcel lockers. The product is coated with a conformal coating, providing anti-mildew, anti-moisture, and anti-salt spray properties.
Official Store| Project | Interface | Explanation |
| Power supply | Wire pressing terminals | DC 8~28 V |
| Network port | RJ45 | 10/100M |
| Working mode | TCP Server、TCP Client、UDP Server、UDP Client、HTTP Client、MQTT Client（default TCP Server） | |
| Socket connection | A TCP server supports up to 5 client connections on a single serial porta | |
| Network protocols | IP、TCP/UDP、IPv4、ICMP、APR、DHCP、DNS、HTTP、MQTT | |
| IP acquisition method | DHCP, static IP (default static IP). | |
| Domain name resolution | Support | |
| Configuration methods | Configuration tools, AT commands, web page configuration | |
| IP address | Customizable, default: 192.168.3.7 | |
| Local ports | Customizable, default: Channel 1~Channel 8: 8001-8008 (for 4-port devices, default is 8001-8004). | |
| Subnet mask | Customizable, default: 255.255.255.0 | |
| Gateway | Customizable, default: 192.168.3.1 | |
| Serial port cache | 8×3k Byte | |
| Serial port packaging mechanism | 1024 Byte | |
| Serial port baud rate | 2400 ~ 115200 bps (default 115200). | |
| Data bits | 8 | |
| Stop position | 1 (default), 2 | |
| Check bit | None（default）、Odd、Even | |
| Installation method | Rail installation | |
| Operating temperature and humidity | -40 ~ +85°C, 5% ~ 95% RH (non-condensing). | |
| Storage temperature and humidity | -40 ~ +105°C, 5% ~ 95% RH (non-condensing). | |