[Interface signal]：RS485
[Operating voltage]：DC 8～28V
[Size]：40*111*119.4mm
[Introduction]：The NA241S is a DIN 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 port to Ethernet port, Modbus protocol conversion, and serial device cloud access. Its industrial design ensures stability in harsh working environments, while 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, barrier gate control, and smart parcel lockers. The product is coated with a conformal coating, providing protection against mold, moisture, and salt spray.
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| Serial number | Name | Explanation |
| 1 | ETH2 | Ethernet port, standard RJ45 interface, 10/100M adaptive |
| 2 | ETH1 | Ethernet port, standard RJ45 interface, 10/100M adaptive |
| 3 | A1 | Channel 1 - RS485 interface A |
| 4 | R1 | Channel 1 - RS485 interface R, short-circuit R1 and B1 to enable the built-in 120Ω matching resistor of serial port 1 |
| 5 | B1 | Channel 1 - RS485 interface B |
| 6 | G1 | Channel 1 - RS485 interface G |
| 7 | A2 | Channel 2 - RS485 interface A |
| 8 | R2 | Channel 2 - RS485 interface R, short R2 and B2 to enable the built-in 120Ω matching resistor of serial port 2 |
| 9 | B2 | Channel 2 - RS485 interface B |
| 10 | G2 | Channel 2 - RS485 interface G |
| 11 | A3 | Channel 3 - RS485 interface A |
| 12 | R3 | Channel 3 - RS485 interface R; short-circuit R3 and B3 to activate the built-in 120Ω matching resistor in serial port 3 |
| 13 | B3 | Channel 3 - RS485 interface B |
| 14 | G3 | Channel 3 - RS485 interface G |
| 15 | A4 | Channel 4 - RS485 interface A |
| 16 | R4 | Channel 4 - RS485 interface R, short-circuiting R4 and B4 to enable serial port 4 with built-in 120Ω matching resistors |
| 17 | B4 | Channel 4 - RS485 interface B |
| 18 | G4 | Channel 4 - RS485 interface G |
| 19 | V+ | DC 8-28 V positive terminal |
| 20 | V- | DC 8-28 V negative terminal |
| 21 | Reload | Restore the factory button, press and hold for 5 seconds after NET stays on for 5 seconds, and the device will be restored to factory settings |