[Interface signal]：RS485/RS422/RS232
[Baud rate]：2400~115200bps (default 115200)
[Product size]：198x109x26.5mm (LxWxH)
[Product weight]：530g±5g
[Installation method]：positioning hole installation
[Introduction]：NB144 is a 4-way serial port server that supports POE power supply. It integrates the TCP/IP protocol stack inside, which can realize the two-way transparent transmission of data from the 4-way serial port to the Ethernet port. The device has the function of ModBus gateway, supports Modbus TCP to RTU, and supports automatic polling. The product adopts industrial-grade standard design to ensure the stability of the equipment in harsh working environments, and the rich indicator lights are used to feedback the different working states of the equipment.
Note: The Phoenix head terminal cannot supply power with the DC plug at the same time.
| serial number | name | Function | illustrate |
| 1 | RS232-4 | Serial port 4 -RS232 interface | Standard DB9 female, 2 -TXD , 3 -RXD , 5- GND |
| 2 | RS232-3 | Serial port 3 -RS232 interface | Standard DB9 female, 2 -TXD , 3 -RXD , 5- GND |
| 3 | RS232-2 | Serial port 2 -RS232 interface | Standard DB9 female, 2 -TXD , 3 -RXD , 5- GND |
| 4 | RS232-1 | Serial port 1 -RS232 interface | Standard DB9 female, 2 -TXD , 3 -RXD , 5- GND |
| 5 | RS422-1-R+ | Serial port 1-RS422 interface-R+ | 3.81mm Phoenix termina |
| 6 | RS422-1-R- | Serial port 1-RS422 interface-R- | 3.81mm Phoenix termina |
| 7 | GND | Serial port 1 ground terminal | 3.81mm Phoenix termina |
| 8 | RS422-1-TH/A | Serial port 1-RS422 interface-T+ Serial port 1-RS485 interface | 3.81mm Phoenix termina |
| 9 | RS422-1-T/B | Serial port 1-RS422 interface-T- Serial port 1-RS485 interface | 3.81mm Phoenix termina |
| 10 | GND | Serial port 1 ground terminal | 3.81mm Phoenix termina |
| 11 | RS422-2-R+ | Serial port 2-RS422 interface-R+ | 3.81mm Phoenix termina |
| 12 | RS422-2-R- | Serial port 2-RS422 interface-R- | 3.81mm Phoenix termina |
| 13 | GND | Serial port 2 ground terminal | 3.81mm Phoenix termina |
| 14 | RS422-2-T+/A | Serial port 2-RS422 interface-T+ Serial port 2-RS485 interface A | 3.81mm Phoenix termina |
| 15 | RS422-2-T/B | Serial port 2-RS422 interface-T- Serial port 2-RS485 interface B | 3.81mm Phoenix termina |
| 16 | GND | Serial port 2 ground terminal | 3.81mm Phoenix termina |
| 17 | RS422-3-R+ | Serial port 3-RS422 interface-R+ | 3.81mm Phoenix termina |
| 18 | RS422-3-R- | Serial port 3-RS422 interface-R- | 3.81mm Phoenix termina |
| 19 | GND | Serial port 2 ground terminal | 3.81mm Phoenix termina |
| 20 | RS422-3-T+/A | Serial port 3-RS422 interface-T+ Serial port 3-RS485 interface A | 3.81mm Phoenix termina |
| 21 | RS422-3-T-/B | Serial port 3-RS422 interface-T- Serial port 3-RS485 interface B | 3.81mm Phoenix termina |
| 22 | GND | Serial port 3 ground terminal | 3.81mm Phoenix termina |
| 23 | RS422-4-R+ | Serial port 4-RS422 interface-R+ | 3.81mm Phoenix termina |
| 24 | RS422-4-R- | Serial port 4-RS422 interface-R- | 3.81mm Phoenix termina |
| 25 | GND | Serial port 4 ground terminal | 3.81mm Phoenix termina |
| 26 | RS422-4-T+/A | Serial port 4-RS422 interface-T+ Serial port 4-RS485 interface A | 3.81mm Phoenix termina |
| 27 | RS422-4-T-/B | Serial port 4-RS422 interface-T- Serial port 4-RS485 interface B | 3.81mm Phoenix termina |
| 28 | GND | Serial port 2 ground terminal | 3.81mm Phoenix termina |
| 29 | - | Negative pole of DC 8-28 V | DC 8 -28 V , 5.08 mm Phoenix termina |
| 30 | + | Positive pole of DC 8-28 V | DC 8 -28 V , 5.08 mm Phoenix termina |
| 31 | DC-IN | DC power input | DC 8-28V ; Outer diameter 5.5mm , inner diameter 2.0 mm in-line round hole |
| 32 | Ethermet | Ethernet interface | Standard R J45 Ethernet interfa |
| 33 | Reload | factory reset button | After long pressing for 5s, N ET is always on for 5s, and the device is restored to factor |