Ebyte NB144ES User manual

Copyright ©2012，Chengdu Ebyte Electronic Technology Co., Ltd. 1
NB144ES
Four Serial Ports
Serial Server
User manual

Chengdu Ebyte Electronic Technology Co., Ltd. NB144ES User Manual
Copyright ©2012，Chengdu Ebyte Electronic Technology Co., Ltd. 1
Contents
Disclaimer and Copyright Notice ...................................................................................................................................3
1 Introduction ................................................................................................................................................................. 4
1.1Features ..................................................................................................................................................................4
2 Quick Start ...................................................................................................................................................................5
2.1 Hardware List ....................................................................................................................................................... 5
2.2 Software ................................................................................................................................................................6
2.3 Device default parameter test steps ......................................................................................................................6
2.3.1 Connecting Hardware ................................................................................................................................6
2.3.2 Device parameter configuration ................................................................................................................7
2.3.3 Turn off the computer firewall .................................................................................................................. 8
2.3.4 Open the "Serial Debug Assistant" ........................................................................................................... 8
2.3.5 Open network assistant ..............................................................................................................................9
2.3.6 Send and receive data test ......................................................................................................................... 9
3 Parameters ................................................................................................................................................................. 10
3.1 Technical parameters .......................................................................................................................................... 10
3.2 Interface Description .......................................................................................................................................... 11
3.4 Dimensions ......................................................................................................................................................... 15
4 Functions ................................................................................................................................................................... 16
4.1 Correspondence between channel and serial port..............................................................................................16
4.2 Local network parameters .................................................................................................................................. 16
4.2.1 Local IP ................................................................................................................................................... 16
4.2.2 DNS ( domain name resolution ) ............................................................................................................ 16
4.2.3 Network disconnection reconnection cycle ............................................................................................ 17
4.2.4 Timeout restart (no data restart) .............................................................................................................. 17
4.3 Hardware factory reset ....................................................................................................................................... 17
4.4 Device working mode ........................................................................................................................................ 17
4.4.1 TCP Server .............................................................................................................................................. 17
4.4.2 TCP Client ............................................................................................................................................... 18
4.4.3 UDP Server ..............................................................................................................................................18
4.4.4 UDP Client .............................................................................................................................................. 18
4.4.5 HTTP client _ .......................................................................................................................................... 19
4.4.6 MQTT client ............................................................................................................................................22
4.5 Channel port ....................................................................................................................................................... 24
5 Advanced Features .....................................................................................................................................................25
5.1 Heartbeat package and registration package ......................................................................................................25
5.1.1 heartbeat packet .......................................................................................................................................25
5.1.2 registration package .................................................................................................................................25
5.2 short connection ..................................................................................................................................................26
5.3 Serial buffer cleaning ......................................................................................................................................... 26
5.4 Modbus gateway .................................................................................................................................................27
5.4.1 Simple Protocol Conversion ................................................................................................................... 27
5.4.2 multi-host mode .......................................................................................................................................29

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5.4.3 storage gateway ....................................................................................................................................... 30
5.4.4 Configurable Gateway .............................................................................................................................31
5.4.5 automatic upload ..................................................................................................................................... 32
5.5 Firmware upgrade ...............................................................................................................................................33
5.5.1 UDP upgrade ........................................................................................................................................... 34
5.5.2 Serial upgrade ..........................................................................................................................................35
6 Revision history .........................................................................................................................................................37
Contact us ................................................................................................................................................................. 37

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Disclaimer and Copyright Notice
Information in this document, including URL addresses for reference, is subject to change without
notice. Documentation is provided "as is" without warranty of any kind, including any warranties of
merchantability, fitness for a particular purpose, or non-infringement, and any warranties referred to
elsewhere in any proposal, specification or sample. No responsibility is assumed in this document,
including any liability for infringement of any patent rights arising out of the use of the information
in this document. This document does not hereby grant, by estoppel or otherwise, any license,
express or implied, to use any intellectual property rights.
The test data obtained in this article are all obtained by the Ebyte laboratory test, and the actual
results may be slightly different. All trade names, trademarks and registered trademarks mentioned
herein are the property of their respective owners and are hereby acknowledged.
Ebyte Electronic Technology Co., Ltd.
Note :
Due to product version upgrade or other reasons, the contents of this manual may be changed. Ebyte Electronic
Technology Co., Ltd. reserves the right to modify the contents of this manual without any notice or prompt. This
manual is only used as a guide . Chengdu Ebyte Electronic Technology Co., Ltd. does its best to provide accurate
information in this manual. However, Chengdu Ebyte Electronic Technology Co., Ltd. does not ensure that the
contents of the manual are completely error-free. All statements in this manual , information and advice do not
create any express or implied warranties.

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1 Introduction
NB144ES 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.
1.1Features
Stable and reliable industrial design, high-level port protection;
Abundant LED status indicators to quickly locate the working status of the device;
Support POE power receiving;
Support Phoenix terminal or DC head power supply, DC 8-28V wide voltage input, support reverse polarity protection;
Support terminal interface ( RS485 /RS422 ) and standard DB9 interface ( RS232 );
The baud rate supports 2400 ~ 115200 bps, and supports multiple verification methods;
Support sending of various registration packets and heartbeat packets, such as connection sending M AC , connection sending customization,
etc.;
Support stable and reliable host computer and AT command configuration, independent configuration of four channels does not affect each other;
Support DNS domain name resolution, domain name resolution server can be configured ;
Support DHCP to dynamically obtain IP, subnet mask , default gateway, DNS server address;
Support multiple working modes TCP client, TCP server, UDP client, UDP server, MQTT client, HTTP client ;
4 -way server mode can be turned on at the same time , supporting 12 clients to dynamically allocate and access, and a single server supports 13
clients to access,
DP server mode that supports memory mode , records the UDP address of the last communication, and uses it as the destination address of the
next communication;
Support a variety of Modbus gateways, which can realize the active reporting of RTU devices, support the mutual conversion of Modbus TCP
and Modbus RTU protocols, and can be configured as a storage mode to automatically collect device data, or a multi-host mode of one question
and one answer;
Support MQTT gateway function, fast access to Aliyun and standard MQTT3.1.1 servers (OneNET, Baidu Cloud, Huawei Cloud, etc.);
Support Modb us data to actively report to TCP transparent transmission server, MQTT server and other servers;
Support HTTP client mode, use HTTP /1.1 protocol, can be configured as two request methods : G ET and P OST
can use TCP/IP direct communication or connect communication through " virtual serial port " ;
Abundant independent LED status indicators, supporting links, network cables, data sending and receiving, etc .;
Support the host computer to perform firmware upgrade or firmware switch through UDP or serial port ;

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2 Quick Start
2.1 Hardware List
1.laptop with RJ45 network port.
2.NB1 44 serial port server.
3.One DC12V 1A power adapter ( not necessary if there is a POE switch ).
4.a network cable.
5.One USB to RS485 serial cable.
6.The specific preparation of hardware equipment is shown in the following:
PC
Ethernet cable
NB144ES
DC 12V1A
USB to RS45
wires
[Note] This chapter only uses one RS485 interface for demonstration, and the other interfaces can use the
corresponding USB converter.

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2.2 Software
NB144ES configuration tool download
Serial Debug Assistant- XCOM download
Network debugging assistant TCP/IP, download
TCP/IP tool
Serial Debug Assistant-XCOM
NB144ES configuration tool
【Note】User can use other test tools to do test, and the operation steps are similar.
2.3 Device default parameter test steps
Different channels use the same IP but different local ports. For example, the factory-configured channel 1
corresponds to port 8001 and channel 4 corresponds to port 8004. For details, see the chapter " Channel and Serial
Port Correspondence ".
2.3.1 Connecting Hardware
1. Connect the serial port server network port and the computer network port with a network cable ;
2. Use a USB to RS485 serial cable to connect the USB port of the computer to any RS 4 85 port of the serial
server ;
3. Use the power adapter ( DC 8 -28V ) to connect the power supply to the device, and observe whether the
indicator light is normal after power on , and refer to " indicator light description ";
4. After confirming that there is no problem with the status, proceed to the next step of configuration;

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2.3.2 Device parameter configuration
In order to enable users to quickly have a simple understanding of the serial server, we use the default parameters
of the serial server to conduct data transparent transmission tests. The default parameters of N B1 44 serial port
server equipment are shown in the table below.
project
default parameters
IP address
192.168.3.7
subnet mask
255.255.255.0
gateway
192.168.3.1
Channel 1 working mode
TCP_SERVER
Local port for channel 1
8 001
Serial baud rate
1 15200
Serial parameters
NONE/8/1/NONE
Make sure that the computer IP and serial server IP are in the same network segment and cannot conflict. The
inspection method is shown in the figure below.

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2.3.3 Turn off the computer firewall
If the communication is unsuccessful, the user can try to turn off the firewall on the computer and try again.
2.3.4 Open the "Serial Debug Assistant"
Select the correct serial port number, configure the correct serial port parameters ( 115200-8N1 ), and open the
serial port, as shown in the figure below:

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2.3.5 Open network assistant
Select the "TCP client " mode, configure the remote IP as "1 92.168.3.7 ", and configure the remote port as "8 001 ",
as shown in the figure below:
2.3.6 Send and receive data test
Click the [Send] button on the " Network Debug Assistant " and " Serial Port Debug Assistant " respectively to
realize the transparent transmission of network and serial port data, as shown in the figure below.

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3 Parameters
3.1 Technical parameters
project
interface
illustrate
power supply
Crimp terminal
DC 8～28 Power supply, used when not available;
Crimp terminal: 5.08 mm Phoenix terminal;
D C female head: straight plug-in round hole, outer diameter
5.5mm , inner diameter 2.0 mm ;
D C female
Network port
RJ45
10M
serial port
Channel 1 to
Channel 4
Interface 1 ( RS485 , 3.81mm Phoenix terminal, support isolation);
Interface 2 ( RS232 , standard RS232 line sequence D B9 female);
Interface 3 ( RS 422 , 3.81mm Phoenix terminal, support isolation);
Operating mode
TCP Server (default), TCP Client, UDP Server, UDP Client, HTTP Client , MQTT Client
Network protocol
TCP/IP, UDP, MQTT , HTTP , IPv4, I CMP , APR , D HCP , D NS
IP acquisition method
DHCP, static IP (default)
DNS
Support, address can be configured
configuration method
Parameter configuration host computer , AT command
IP address
192.168.3.7 (customizable)
local port
Channel 1~ 4 : 8 001-800 4 (can be customized)
subnet mask
255.255.255.0 (customizable)
gateway
192.168.3.1 (customizable)
Serial cache
512 Bytes
Serial packaging
mechanism
512 Bytes
Serial baud rate
2400 ~ 115200 bps (default 115200)
data bit
8
stop bit
1 (default), 2
Check Digit
None (default), Odd, Even
installation method
positioning hole
Product Size
1 98 x 108x26.5mm ( LxWxH ) _ _
product weight
5 30 g ±5 g
Working temperature
and humidity
-40 ～+85℃, 5% ～95%RH (no condensation)
storage temperature
and humidity
-40 ～+105℃, 5% ～95%RH (no condensation)

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3.2 Interface Description
serial
number
name
Function
illustrate
1
R S232-4
Serial port 4 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
2
R S232-3
Serial port 3 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
3
R S232-2
Serial port 2 -RS232
interface
Standard DB9 female, 2 -TXD , 3 -RXD , 5-
GND
4
R S232-1
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 terminal
6
RS422-1-R-
Serial port 1-RS422
interface-R-
3.81mm Phoenix terminal
7
GND
Serial port 1 ground
3.81mm Phoenix terminal

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terminal
8
RS422-1-T+/A
Serial port 1-RS422
interface-T+
Serial port 1-RS485
interface A
3.81mm Phoenix terminal
9
RS422-1-T-/B
Serial port 1-RS422
interface-T-
Serial port 1-RS485
interface B
3.81mm Phoenix terminal
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+
Serial port 2-RS485
interface A
3.81mm Phoenix terminal
15
RS422-2-T-/B
Serial port 2-RS422
interface-T-
Serial port 2-RS485
interface B
3.81mm Phoenix terminal
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+
Serial port 3-RS485
interface A
3.81mm Phoenix terminal
twenty
one
RS422-3-T-/B
Serial port 3-RS422
interface-T-
Serial port 3-RS485
interface B
3.81mm Phoenix terminal
twenty
two
GND
Serial port 3 ground
terminal
3.81mm Phoenix terminal
twenty
RS422-4-R+
Serial port 4-RS422
3.81mm Phoenix terminal

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three
interface-R+
twenty
four
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+
Serial port 4-RS485
interface A
3.81mm Phoenix terminal
27
RS422-4-T-/B
Serial port 4-RS422
interface-T-
Serial port 4-RS485
interface B
3.81mm Phoenix terminal
28
GND
Serial port 2 ground
terminal
3.81mm Phoenix terminal
29
-
Negative pole of DC 8-28
V
DC 8 -28 V , 5.08 mm Phoenix terminal;
30
+
Positive pole of DC 8-28
V
DC 8 -28 V , 5.08 mm Phoenix terminal;
31
DC -IN
DC power input
DC 8-28V ;
Outer diameter 5.5mm , inner diameter 2.0 mm
in-line round hole;
32
Ethernet _
Ethernet interface
Standard R J45 Ethernet interface
33
re load
factory reset button
After long pressing for 5s, N ET is always on
for 5s, and the device is restored to factory
Warning: Only one of the two power supply ports can be used in one time.
3.3Indicator light description
Label
Function
illustrate
POWER
Power Indicator
Connect to the power supply, light up;
N ET
Running lights
Not connected to the network cable: 1 00 ms on, 9 00 ms off,
flashing periodically;
Connecting the network cable: 1s is a cycle of flashing;

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LINK 1
Channel 1 Status
Indicator
No link connection: the indicator light is off;
The link connection is successful: the indicator light is
always on;
UDP mode: the indicator light is always on;
DATA1
Channel 1 data
indicator
Data sending and receiving: flashes when the network or
serial port sends and receives data;
LINK2
Channel 2 status
indicator
No link connection: the indicator light is off;
The link connection is successful: the indicator light is
always on;
UDP mode: the indicator light is always on;
DATA2
Channel 2 status
indicator
Data sending and receiving: flashes when the network or
serial port sends and receives data;
LINK3
Channel 3 Status
Indicator
No link connection: the indicator light is off;
The link connection is successful: the indicator light is
always on;
UDP mode: the indicator light is always on;
DATA3
Channel 3 Status
Indicator
Data sending and receiving: flashes when the network or
serial port sends and receives data;
LINK4
Channel 4 status
indicator
No link connection: the indicator light is off;
The link connection is successful: the indicator light is
always on;
UDP mode: the indicator light is always on;
DATA4
Channel 4 status
indicator
Data sending and receiving: flashes when the network or
serial port sends and receives data;
[Note] The status of some special working mode indicator lights:
1.Restore the factory, NET is always on for 5s, and the rest of the indicators remain in the state until NET goes
out and then goes out;
2.Wait for the firmware burning, and the other indicators except the power indicator will flash at a period of 50
ms until the upgrade file starts to be transferred, or the firmware burning wait is exited;
3.During the firmware burning operation, all the indicators except the power indicator will flash at a cycle of
500 ms until the upgrade is completed;

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3.4 Dimensions

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4 Functions
4.1 Correspondence between channel and serial port
Baud rate: 2 400 , 4 800 , 9 600 , 1 4400 , 1 9200 , 3 8400 , 5 7600 , 7 6800 , 1 15200bps ;
Data bits: only 8 bits are supported;
Parity bit: support no parity (N ONE ), odd parity (O DD ), even parity (E VEN );
Hardware flow control: not supported;
Channel
Serial Port
indicator
light
serial protocol
Factory port, mode
channel 1
COM 1
P ORT1
RS485 , RS232 , RS422
8 001 , TCPS
channel 2
COM 2
P ORT2
RS485 , RS232 , RS422
8 002 , TCPS
channel 3
COM 3
P ORT3
RS485 , RS232 , RS422
8 003 , TCPS
channel 4
COM 4
P ORT4
RS485 , RS232 , RS422
8 004 , TCPS
4.2 Local network parameters
4.2.1 Local IP
STATIC (static IP ) : users can define configuration IP , subnet mask, default gateway, domain name resolution
server (D NS server);
DHCP (dynamic IP acquisition): The device logs in to the server to automatically obtain the IP address, subnet
mask, gateway address, and DNS server address parameters assigned by the server and configure them for use;
4.2.2 DNS ( domain name resolution )
When the user enters the domain name, the DNS server will be automatically queried, and the
DNS server will retrieve the database to obtain the corresponding IP address. In the static IP mode ,
the user can customize the domain name resolution server to resolve private domain name server
data . In this mode, the device automatically follows the domain name resolution server configured
by the routing device, and the user only needs to modify the DNS server of the routing device
without configuring the device.

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4.2.3 Network disconnection reconnection cycle
When the device detects that it is disconnected from the server, it periodically initiates a
reconnection request, so the "disconnection reconnection time" will not affect the connection
establishment time under normal circumstances. Users can customize the configuration request cycle,
and the default is 5s.
4.2.4 Timeout restart (no data restart)
The device monitors data sending and receiving. If the device does not send and receive data for
a long time, the device will automatically restart to ensure the stability of long-term work.
The default cycle of this function is 30 minutes, and the user can customize the cycle of
restarting with timeout or no data.
4.3 Hardware factory reset
Reload pin of the device for 5s until the N ET indicator light stops flashing, keep the NET indicator
on for 5s, and the device is restored to factory.
4.4 Device working mode
4.4.1 TCP Server
TCP Server is the TCP server. In TCP Server mode, the device listens to the local port, accepts the
connection request from the client and establishes a connection for data communication. When the
Modbus gateway function is turned off, the device sends the data received by the serial port to all
client devices connected to the device.
The number of clients that can be accessed by the server is dynamically adjusted. First, ensure that
each channel of the 4 channels can establish a complete communication link. In addition, the device
also has 12 communication links for dynamic access. For example, if the device turns on the 4
-channel server mode, each The server can access 4 client devices, or if the device opens 1 server, the
server can connect to 13 client devices. If the number of client devices exceeds the access number,
the device will refuse to connect.

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4.4.2 TCP Client
TCP Client is the TCP client. When the device is working, it will actively initiate a connection
request to the server and establish a connection to realize the interaction between serial port data and
server data.
To use the client, you need to configure the IP address/domain name and target port of the target
accurately .
4 channels can independently open 4 TCP clients.
4.4.3 UDP Server
UDP Server means that the device does not verify the source IP address of the data when using the
UDP protocol to communicate. After receiving a UDP data packet, it saves the source IP address and
source port of the data packet, and sets it as the target IP and port . , so the data sent by the device
only sends data packets to the source IP address and port where the device received data last time .
This mode is usually used in scenarios where multiple network devices communicate with this
device, and the frequency is high, and the TCP Server cannot meet the conditions.
Using UDP Server requires the remote UDP device to send data first, otherwise the data cannot be
sent normally.
[Note] In UDP mode, the data sent by the network to the device should be less than 5 12B it per packet, otherwise it
will cause data loss .
4.4.4 UDP Client
UDP Client is a connectionless transmission protocol that provides transaction-oriented simple and
unreliable information transmission services. There is no connection establishment and
disconnection, and data can be sent to the other party only by configuring the destination IP and
destination port. It is usually used in the data transmission scenario where there is no requirement for
the packet loss rate, the data packet is small and the sending frequency is fast, and the data is to be
transmitted to the specified IP.
In UDP Client mode, the device will only communicate with the configured (target IP and target port)
remote UDP device .
In this mode, the destination address is set to 255.255.255.255, and the sending data will be

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broadcast on the entire network segment, but the sending and receiving devices need to ensure that
the ports are consistent, and the device can also receive broadcast data .
[Note] In UDP mode, the data sent by the network to the device should be less than 5 12B it per packet, otherwise it
will cause data loss.
4.4.5 HTTP client _
This mode can realize HTTP automatic package function, and provides two methods of GET and POST.
Customers can configure URL, Header and other parameters by themselves, and the device will send the package to
realize fast communication between serial port data and HTTP server. URL and Header It supports up to 128 bytes
of data, and the 4 channels can independently open the HTTP client mode without affecting each other.
The HTTP request data should be smaller than the packet length (5 to 12 bytes), otherwise the device will
divide the request data into multiple packets for request, resulting in abnormal request.
supports configuring whether to return the HTTP protocol header, and the returned data is shown in the figure
below: