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Home >Modem>Serial server/Ethernet>Multi-serial server
4-channel serial port server
4-channel serial port server
4-channel serial port server
4-channel serial port server
4-channel serial port server
4-channel serial port server
NB144S-V2 Industrial-grade 4-channel serial port server Bidirectional transparent data transmission between serial and Ethernet Compatible with TCP/UDP/MQTT/HTTP protocols

[Interface Signal]：Serial Port (RS485/RS232), Ethernet Port (RJ45)

[Operating Voltage]：DC 8-28V

[Network Protocols]： IP, TCP/UDP, IPv4, ICMP, APR, DHCP, DNS, HTTP, MQTT

[Installation Method]：positioning hole installation

[Size]：198*109*26.5mm

[Product weight]：520 ± 5g

[Introduction]：The NB144S-V2 is a second-generation 4-port serial server developed by Ebyte. It integrates a TCP/IP protocol stack, enabling bidirectional transparent transmission of serial-to-Ethernet data, Modbus protocol conversion, and serial device cloud connectivity. Supporting host computer configuration, it is widely used in industries such as computer room monitoring and environmental monitoring. It is coated with conformal coating, offering anti-mold, anti-humidity, and anti-salt spray properties.

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Serial number name Function illustrate
1 RS232-4 Serial port 4-RS232 interface Standard DB9 female connector, 2-TXD, 3-RXD, 5-GND
2 RS232-3 Serial port 3-RS232 interface Standard DB9 female connector, 2-TXD, 3-RXD, 5-GND
3 RS232-2 Serial port 2-RS232 interface Standard DB9 female connector, 2-TXD, 3-RXD, 5-GND
4 RS232-1 Serial port 1-RS232 interface Standard DB9 female connector, 2-TXD, 3-RXD, 5-GND
5 RS422-1-R+ Serial port 1-RS422 interface-R+ 3.81mm Phoenix terminal
6 RS422-1-R- Serial port 1-RS422 interface-R- 3.81mm Phoenix terminal
7 GND Serial port 1 ground terminal 3.81mm Phoenix terminal
8 RS422-1-T+/A Serial port 1-RS422 interface-T+ 3.81mm Phoenix terminal
Serial port 1-RS485 interface A
9 RS422-1-T-/B Serial port 1-RS422 interface-T- 3.81mm Phoenix terminal
Serial port 1-RS485 port B
10 GND Serial port 1 ground terminal 3.81mm Phoenix terminal
11 RS422-2-R+ Serial port 2-RS422 interface-R+ 3.81mm Phoenix terminal
12 RS422-2-R- Serial port 2-RS422 interface-R- 3.81mm Phoenix terminal
13 GND Serial port 2 ground terminal 3.81mm Phoenix terminal
14 RS422-2-T+/A Serial port 2-RS422 interface-T+ 3.81mm Phoenix terminal
Serial port 2-RS485 interface A
15 RS422-2-T-/B Serial port 2-RS422 interface-T- 3.81mm Phoenix terminal
Serial port 2-RS485 interface B
16 GND Serial port 2 ground terminal 3.81mm Phoenix terminal
17 RS422-3-R+ Serial port 3-RS422 interface-R+ 3.81mm Phoenix terminal
18 RS422-3-R- Serial port 3-RS422 interface-R- 3.81mm Phoenix terminal
19 GND Serial port 2 ground terminal 3.81mm Phoenix terminal
20 RS422-3-T+/A Serial port 3-RS422 interface-T+ 3.81mm Phoenix terminal
Serial port 3-RS485 interface A
21 RS422-3-T-/B Serial port 3-RS422 interface-T- 3.81mm Phoenix terminal
Serial port 3-RS485 interface B
22 GND Serial port 3 ground terminal 3.81mm Phoenix terminal
23 RS422-4-R+ Serial port 4-RS422 interface-R+ 3.81mm Phoenix terminal
24 RS422-4-R- Serial port 4-RS422 interface-R- 3.81mm Phoenix terminal
25 GND Serial port 4 ground terminal 3.81mm Phoenix terminal
26 RS422-4-T+/A Serial port 4-RS422 interface-T+ 3.81mm Phoenix terminal
Serial port 4-RS485 interface A
27 RS422-4-T-/B Serial port 4-RS422 interface-T- 3.81mm Phoenix terminal
Serial port 4-RS485 interface B
28 GND Serial port 2 ground terminal 3.81mm Phoenix terminal
29 - Negative terminal of DC 8-28 V DC 8-28 V, 5.08mm Phoenix terminal;
30 + Positive terminal of DC 8-28 V DC 8-28 V, 5.08mm Phoenix terminal;
31 DC-IN DC power input DC 8-28 V; 5.5mm outer diameter, 2.0mm inner diameter straight-in round hole;
32 Ethernet Ethernet interface Standard RJ45 Ethernet interface
33 Reload Restore factory button Press and hold for 5 seconds, then NET will light up for 5 seconds, and the device will be restored to factory settings.
Label Function illustrate
POWER Power indicator Lights up after DC 8-28V power input
NET Network indicator light No network cable connected: Off; Network cable connected: On;
LINK1 Channel 1 status indicator Link not connected: the indicator light is off; Link connected successfully: the indicator light is always on; UDP mode: the indicator light is always on;
DATA1 Channel 1 data indicator Flashes when the network or serial port is sending or receiving data;
LINK2 Channel 2 status indicator Link not connected: the indicator light is off; Link connected successfully: the indicator light is always on; UDP mode: the indicator light is always on;
DATA2 Channel 2 status indicator Flashes when the network or serial port is sending or receiving data;
LINK3 Channel 3 status indicator Link not connected: the indicator light is off; Link connected successfully: the indicator light is always on; UDP mode: the indicator light is always on;
DATE3 Channel 3 status indicator Flashes when the network or serial port is sending or receiving data;
LINK4 Channel 4 status indicator Link not connected: the indicator light is off; Link connected successfully: the indicator light is always on; UDP mode: the indicator light is always on;
DATA4 Channel 4 status indicator Flashes when the network or serial port is sending or receiving data;