Waveshare RS232/485 TO ETH (for EU) User Manual

RS232/485 TO ETH User Manual

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RS232/485 TO ETH

User Manual

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CONTENTS

Features ............................................................................................................................................... 4

1. Get Start ........................................................................................................................... 5

1.1. Application Diagram ................................................................................................... 5

1.2. Hardware Design ......................................................................................................... 5

1.2.1. Hardware Dimensions ................................................................................... 5

1.2.2. LED ........................................................................................................................ 6

2. Product Functions ........................................................................................................ 7

2.1. Basic Functions ............................................................................................................. 8

2.1.1. Static IP/DHCP .................................................................................................. 8

2.1.2. Reset to default settings ................................................................................ 8

2.2. Socket functions ........................................................................................................... 9

2.2.1. TCP Client ........................................................................................................... 9

2.2.2. TCP Server .......................................................................................................... 9

2.2.3. UDP Client ......................................................................................................... 10

2.2.4. UDP Server ....................................................................................................... 11

2.2.5. HTTP Client ...................................................................................................... 11

2.2.6. WebSocket ........................................................................................................ 12

2.3. Serial port ..................................................................................................................... 13

2.3.1. Serial port basic parameters ..................................................................... 13

2.3.2. VCOM Application .......................................................................................... 13

2.3.3. Flow Control .................................................................................................... 13

2.3.4. Serial package methods .............................................................................. 13

2.3.5. Baud rate synchronization ......................................................................... 13

2.4. Features ......................................................................................................................... 14

2.4.1. Identity packet function .............................................................................. 14

2.4.2. Heartbeat packet function ......................................................................... 14

2.4.3. Non-persistent connection ......................................................................... 14

2.4.4. Modbus gateway ............................................................................................ 14

2.4.5. Network printing ........................................................................................... 15

2.4.6. Editable Web Server ..................................................................................... 15

3. Parameter Setting ...................................................................................................... 16

3.1. Setup software ............................................................................................................ 16

3.2. Web Server ................................................................................................................... 17

3.3. AT command ................................................................................................................ 17

3.3.1. Serial AT command ....................................................................................... 17

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3.3.2. Network AT command ................................................................................. 17

4. Contact Us ..................................................................................................................... 19

5. Disclaimer ..................................................................................................................... 20

6. Update History ............................................................................................................ 21

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FEATURES

⚫ 10/100Mbps Ethernet interface and support Auto-MDI/MDIX.
⚫ Support TCP Server, TCP Client, UDP Client, UDP Server, HTTP Client.
⚫ Support configuring through Web Server
⚫ Support RS232 and RS485 and they can work independently.
⚫ Support RTS/CTS hardware flow control and Xon/Xoff software flow control.
⚫ Support USR-VCOM.
⚫ Support Modbus Gateway.
⚫ Support serial port baud rate 600bps~230.4K bps; support None, Odd, Even, Mark, Space

parity way.

⚫ Support Static IP or DHCP.
⚫ Support Websocket function.
⚫ Support Reload button to reset to default settings by hardware way.
⚫ Support Keep-alive.
⚫ Support timeout restart function and timeout reconnect function

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1. GET START

Product link: https://www.waveshare.com/wiki/RS232/485_TO_ETH

Setup software: https://www.waveshare.com/wiki/RS232/485_TO_ETH_Software

Demo Code: https://www.waveshare.com/wiki/File:PC_Socket_Demo.zip

1.1. APPLICATION DIAGRAM

Figure 1 Application Diagram

1.2. HARDWARE DESIGN

1.2.1. HARDWARE DIMENSIONS

Figure 2 Hardware Dimensions

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1.2.2. LED

Table 1 LED

LED

Status

POWER

Light: Power on

Off: Power off

WORK

Blink: Working normally

Off or light: Not working normally

232TX

Blink: Sending data to serial(RS232)

Off: No data sending to serial(RS232)

232RX

Blink: Receiving data from serial(RS232)

Off: No data receiving from serial(RS232)

485TX

Blink: Sending data to serial(RS485)

Off: No data sending to serial(RS485)

485RX

Blink: Receiving data from serial(RS485)

Off: No data receiving from serial(RS485)

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2. PRODUCT FUNCTIONS

This chapter introduces the functions of USR-TCP232-RS232/485 TO ETH as the following

diagram shown, you can get an overall knowledge of it.

Websocket

Serial Port

Device

Network

Serial Port

Mobus Gateway

Serial Port

Packaging

Socket A

Socket B

TCPS/TCPC/UDPS/UDPC/HTTPD Client

TCPC/UDPC

USR

CLOUD

Keep-Alive

Identity

Packet

Serial Heartbeat Packet

Network Heartbeat Packet

Serial Port Packaging

Webserver

Network data

Transmission

ModbusTCP Gateway

AT Command Mode

Serial AT Command

Parameter Query/Set

Figure 3 Product Functions diagram

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2.1. BASIC FUNCTIONS

2.1.1. STATIC IP/DHCP

There are two ways for module to get IP address: Static IP and DHCP.

Static IP: Default setting of module is Static IP and default IP is 192.168.0.7. When user
configures module in Static IP mode, user need set IP, subnet mask and gateway and must pay
attention to the relation among IP, subnet mask and gateway.

DHCP: Module in DHCP mode can dynamically get IP, Gateway, and DNS server address

from Gateway Host. When user connects RS232/485 TO ETH directly to PC, module can’t be set

in DHCP mode. Because common computer does not have the ability to assign IP addresses.

2.1.2. RESET TO DEFAULT SETTINGS

Hardware: Power off the RS232/485 TO ETH and press Reload button, then power on the
RS232/485 TO ETH and keep pressing Reload button over 5 seconds can reset to default settings.

Software: User can also reset to default settings through setup software for RS232/485 TO
ETH.

AT command: User can send AT+RELD to reset to default settings.

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2.2. SOCKET FUNCTIONS

RS232/485 TO ETH supports dual sockets mode. Socket A supports TCP Server, TCP Client, UDP

Server, UDP Client and HTTP Client. Socket B supports TCP Client and UDP Client.

2.2.1. TCP CLIENT

Figure 4 TCP Client

TCP Client provides Client connections for TCP network services. TCP Client device will
connect to server to realize data transmission between the serial port device and server.
According to the TCP protocol, TCP Client has connection/disconnection status differences to
ensure reliable data transmission.

TCP Client mode supports Keep-Alive function: After establishing connection, RS232/485 TO
ETH will send Keep-Alive package in every 15 second to check TCP connection and RS232/485 TO
ETH will disconnect and reconnect to server if any connection exception occurs. TCP Client mode
also supports baud rate synchronization, USR Cloud and Modbus gateway.

RS232/485 TO ETH works in TCP Client mode needs connect to TCP Server and needs set the

parameter: Remote IP/Port. RS232/485 TO ETH works in TCP Client won’t accept other

connection request except target server and will access server with random local port if
configuring local port to 0.

2.2.2. TCP SERVER

Figure 5 TCP Server

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RS232/485 TO ETH works in TCP Server mode will listen network connections and build
network connections, commonly be used for communication with TCP clients on a LAN.
According to the TCP protocol, TCP Server has connection/disconnection status differences to
ensure reliable data transmission.

RS232/485 TO ETH works in TCP Server mode will listen local port which user set and build
connection after receiving connection request. Serial data will be sent to all TCP Client devices
connected to RS232/485 TO ETH in TCP Server mode simultaneously.

RS232/485 TO ETH works in TCP Server mode supports 8 client connections at most.
RS232/485 TO ETH also supports Keep-Alive function, baud rate synchronization and Modbus
gateway.

2.2.3. UDP CLIENT

Figure 6 UDP Client

UDP transport protocol provides simple and unreliable communication services. No
connection connected

/disconnected. User only needs to configure Remote IP/Port then can realize data transmission.

In UDP Client mode, RS232/485 TO ETH will only communicate with Remote IP/Port. If data
don’t from Remote IP/Port, it won’t be received by RS232/485 TO ETH.

In UDP Client mode, if user configure Remote IP to 255.255.255.255, RS232/485 TO ETH can
achieve UDP broadcast to all network segment and receive broadcast data. User can also
configure Remote IP to xxx.xxx.xxx.255 to realize UDP broadcast in same network segment.

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2.2.4. UDP SERVER

Figure 7 UDP Server

In UDP Server mode, RS232/485 TO ETH will change Remote IP every time after receiving
UDP data from a new IP/Port and will send data to latest communication IP/Port.

2.2.5. HTTP CLIENT

Figure 8 HTTP Client

Figure 9 HTTP Client

Serial Device

RS232/485

TO ETH

HTTP Server

HTTP/1.1 200 OK

Data: Wed, 24 Jun 2015 04:08:35
GMT
Server.Apache/2.0.63(Win32)PHP/5.

2.4 X-Powered-By: PHP/5.2.14

Cache-Control: max-age=31104000
Expires: Fri, 18 Aug 2017 03:25:47
GMT Content-Length: 3

Connection: close Content-Type:
text/html

ABC

GET/1.php?data=ABC HTTP/1.1

Host: www.usr.cn:80 User-Agent:
Mozilla/4.0 Connection: close

data=ABC

ABC

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In HTTP Client mode, RS232/485 TO ETH can achieve data transmission between serial port
device and HTTP server. User just needs to configure RS232/485 TO ETH in HTTP Client and
configure the HTTP header, URL and some other related parameters, then can achieve data

transmission between serial port device and HTTP server and don’t need care about the HTTP

format of data.

2.2.6. WEBSOCKET

Figure 10 WebSocket

WebSocket function can achieve real-time interaction between RS232 interface and Web

Server and display user data on Web Server.

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2.3. SERIAL PORT

2.3.1. SERIAL PORT BASIC PARAMETE RS

Parameters

Range

Baud Rate

600~230.4Kbps

Data Bits

5, 6, 7, 8

Stop Bits

1, 2

Parity Bits

None, Odd, Even, Mark, Space

2.3.2. VCOM APPLI CATION

Figure 11 Serial port basic parameters

User can download VCOM software from: Figure 14 VCOM application

https://www.waveshare.com/wiki/RS232/485_TO_ETH_Software.

Through this software user can set up connection between RS232/485 TO ETH and virtual
serial to solve the problem that traditional equipment PC software used in serial port
communication way.

2.3.3. FLOW CONTROL

RS232/485 TO ETH supports hardware flow control way ( RTS/CTS, only take effect in RS232
mode ) and software flow control way Xon/Xoff.

2.3.4. SERIAL PACK AGE METHO DS

For network speed is faster than serial. Module will put serial data in buffer before sending
it to network. The data will be sent to network side as data package. There are 2 ways to end the
package and send package to network side - Time Trigger Mode and Length Trigger Mode.

⚫ RS232/485 TO ETH serial package time: Default is 4 bytes sending time, range from 0 to 255.
⚫ RS232/485 TO ETH serial package length: Default is 1460 bytes, range from 0 to 1460.

2.3.5. BAUD RATE SYNCHRONIZ ATION

When module works with USR devices or software, serial parameters will change
dynamically according to network protocol. User can modify serial parameters by sending data
conformed to specific protocol via network. It is temporary, after restarting DTU, the
parameters will back to original parameters.

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2.4. FEATURES

2.4.1. IDENTITY PACKET FUNCTION

Identity packet is used for identifying the device when RS232/485 TO ETH works as TCP
client/UDP client. There are two methods to send identity packet.

⚫ Identity packet will be sent after connection is established.

⚫ Identity packet will be added on the front of every data package.

Identity packet can be MAC address or user editable identity packet. User editable identity
packet should less than 40 bytes.

2.4.2. HEARTBEAT P ACKET FUN CTION

Heartbeat packet: RS232/485 TO ETH will output heartbeat packet to serial side or network
side periodic. User can configure the heartbeat packet data and sending interval. Serial
heartbeat packet can be used for polling Modbus data. Network heartbeat packet can be used
for showing connection status and keeping the connection (only take effect in TCP/UDP Client
mode).

2.4.3. NON-PERSISTENT CONNE CTION

RS232/485 TO ETH support non-persistent connection function in TCP Client mode. When
RS232/485 TO ETH adopts this function, RS232/485 TO ETH will connect to server and send data
after receiving data from serial port side and will disconnect to server after sending all the data
to server and no data from serial port side over 3s.

2.4.4. MODBUS GATEWAY

Modbus gateway includes: Modbus transparent transmission, Modbus RTU<=>Modbus TCP
protocol conversion, Modbus polling and serial port query.

Figure 12 Identity Packet application diagram

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Modbus RTU<=>Modbus TCP: Set RS232/485 TO ETH in TCP Server or TCP Client mode, then
user can set RS232/485 TO ETH with Modbus

RTU<=>Modbus TCP function. Data transmission diagram as follow:

Figure 13 Modbus RTU<=>Modbus TCP

Modbus polling: RS232/485 TO ETH support Modbus polling function.

Figure 14 Modbus polling

2.4.5. NETWORK PRINTING

The network printing function is similar to the printer server. Through the existing printing
driver, it can be modified slightly and realize the network printing function by the original serial
printer.

2.4.6. EDITABLE WE B SERVER

RS232/485 TO ETH supports modifying the Web Server based on template according to
needs, then using related tool to upgrade. If user has this demand can contact to our
salespersons for Web Server source and tool.

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3. PARAMETER SETTING

There are three ways to configure RS232/485 TO ETH. They are setup software, Web Server

and AT command.

3.1. SETUP SOFTWARE

User can download setup software from

https://www.waveshare.com/wiki/RS232/485_TO_ETH_Software

When user want to configure the RS232/485 TO ETH by setup software, user can run setup

software, search RS232/485 TO ETH in same LAN and configure the RS232/485 TO ETH as follow:

After researching RS232/485 TO ETH and clicking RS232/485 TO ETH to configure, user need log
in with user name and password. Default user name and password both are admin. If user keep
the default parameters, it is not necessary to log in.

Figure 15 Setup software

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3.2. WEB SERVER

User can connect PC to RS232/485 TO ETH through LAN port and enter Web Server to

configure. Web Server default parameters as follow:

Table 2 Web server default parameters

Parameter

Default settings

Web server IP address

192.168.0.7

User name

admin

Password

admin

After firstly connecting PC to RS232/485 TO ETH, user can open browser and enter default
IP 192.168.0.7 into address bar, then log in user name and password, user will enter Web Server.
Web Server screenshot as follow:

3.3. AT COMMAND

We have specific user manual for AT commands.

3.3.1. SERIAL AT COMMAND

In work mode, user can enter AT command mode and send AT commands to module to
configure the module.

3.3.2. NETWORK AT COMMAND

Network AT command is to send a search keyword by broadcast, then set the parameters in
a single broadcast way(If user want to use network AT command, module and PC which send the

Figure 16 Web Server

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network AT command must in same network segment). If user enter network AT command

mode but don’t send any command over 30 seconds, module will exit network AT command

mode. User can enter network AT command mode as follow way:

Figure 17 Network AT Command

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4. CONTACT US

Email:

(order/shipment) [e-mail]

(tech support) [e-mail]

(complaint) [e-mail]

(apply for distributor) [e-mail]

Skype:

(order/shipment) sales@waveshare

(tech support) service@waveshare

Whatsapp: [phone]

Phone: [phone]

Fax: [phone]

Address: Waveshare Electronics 10F, International Science & Technology Building, Fuhong
Rd, Futian District, Shenzhen, China

Website: www.waveshare.com

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5. DISCLAIMER

This document provides the information of USR-TCP232-RS232/485 TO ETH products, it

hasn’t been granted any intellectual property license by forbidding speak or other ways either
explicitly or implicitly. Except the duty declared in sales terms and conditions, we don’t take any
other responsibilities. We don’t warrant the products sales and use explicitly or implicitly,

including particular purpose merchant-ability and marketability, the tort liability of any other
patent right, copyright, intellectual property right. We may modify specification and description
at any time without prior notice.

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6. UPDATE HISTORY

⚫ 2019-05-06 V1.0.0 Established.