Waveshare RS485 TO ETH User manual

RS485 TO ETH
RS485 TO ETH
User Manual

RS485 TO ETH
CONTENT
Features....................................................................................................................................................4
1. Get Start...........................................................................................................................................5
1.1. Application Diagram ............................................................................................................5
1.2. Hardware Design .................................................................................................................6
Hardware Dimensions ..............................................................................................................6
2. Product Functions ............................................................................................................................7
2.1. Basic Functions ....................................................................................................................7
2.1.1. Static IP/DHCP.........................................................................................................7
2.1.2. Restore Default Settings .........................................................................................8
2.1.3. Upgrade Firmware Version .....................................................................................8
2.2. Socket Functions..................................................................................................................9
2.2.1. TCP Client ................................................................................................................9
2.2.2. TCP Server .............................................................................................................10
2.2.3. UDP Client .............................................................................................................11
2.2.4. UDP Server ............................................................................................................12
2.2.5. HTTPD Client .........................................................................................................13
2.3. Serial Port ..........................................................................................................................14
2.3.1. Serial Port Basic Parameters .................................................................................14
2.3.2. VCOM Application.................................................................................................14
2.3.3. Serial Package Methods ........................................................................................14
2.3.4. Baud Rate Synchronization ...................................................................................15
2.4. Features.............................................................................................................................16
2.4.1. Identity Packet Function .......................................................................................16
2.4.2. Heartbeat Packet Function....................................................................................16
2.4.3. Editable Web Server..............................................................................................17
2.4.4. Reset Function.......................................................................................................17
2.4.5. Index Function.......................................................................................................18
2.4.6. TCP Server Setting.................................................................................................19

RS485 TO ETH
2.4.7. Non-Persistent Connection...................................................................................19
2.4.8. Timeout Reset Function ........................................................................................20
3. Parameter Setting ..........................................................................................................................21
3.1. Setup Software Configuration ...........................................................................................21
3.2. Web Server Configuration .................................................................................................22
3.3. AT Command .....................................................................................................................23
3.3.1. Serial AT CoFmmand .............................................................................................23
4. Contact US......................................................................................................................................24
5. Disclaimer.......................................................................................................................................25

RS485 TO ETH
FEATURES
⚫10/100Mbps Ethernet port, support Auto-MDI/MDIX.
⚫Support TCP Server, TCP Client, UDP Client, UDP Server, HTTPD Client.
⚫Support Baud rate from 600bps to 230.4bps; Support None, Odd, Even, Mark, Space.
⚫Support heartbeat packet and identity packet.
⚫Support web server, AT command and setup software to configure module.
⚫Support timeout reset function.
⚫Support TCP Client non-persistent function.
⚫Support DHCP/Static IP.
⚫Support software/hardware reload.
⚫Support virtual serial port with USR-VCOM software.

RS485 TO ETH
1. GET START
⚫Product link: https://www.waveshare.com/wiki/RS485_TO_ETH
⚫Setup software: https://www.waveshare.com/wiki/RS485_TO_ETH_Software
⚫Demo codes: https://www.waveshare.com/wiki/File:PC_Socket_Demo.zip
1.1. APPLICATION DIAGRAM
Figure 1 Application

RS485 TO ETH
1.2. HARDWARE DESIGN
HARDWARE DIMENSIONS
Figure 2 Hardware Dimension

RS485 TO ETH
2. PRODUCT FUNCTIONS
This chapter introduces the functions of RS485 TO ETH as the following diagram shown, you can get
an overall knowledge of it.
Figure 3 Product Functions diagram
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 set 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 connect directly to PC, module can’t be set in DHCP mode. Because common
computer does not have the ability to assign IP addresses.
User can change Static IP/DHCP by setup software. Setting diagram as follow:
Serial
port

RS485 TO ETH
2.1.2. RESTORE DEFAULT SETTINGS
Hardware: User can press Reload over 5 seconds and less than 15 seconds then release to restore
default settings. Software: User can use setup software to restore default settings.
AT command: User can enter AT command mode and use AT+RELD to restore default settings.
2.1.3. UPGRADE FIRMWARE VERSION
User can contact to salespersons for needed firmware version and upgrade by setup software as
follow:
Figure 4 Static IP/DHCP
Figure 5 Upgrade Firmware Version

RS485 TO ETH
2.2. SOCKET FUNCTIONS
RS485 TO ETH socket support TCP Server, TCP Client, UDP Server, UDP Client and HTTPD Client.
2.2.1. 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 and server. According to the TCP protocol,
TCP Client has connection/disconnection status differences to ensure reliable data transmission.
TCP Client mode support Keep-Alive function: After connection is established, module will send
Keep-Alive packets about every 15 seconds to check the connection and will disconnect then
reconnect to TCP server if abnormal connection is been checked by Keep-Alive packets. TCP Client
mode also support non-persistent function.
RS485 TO ETH work in TCP Client mode need connect to TCP Server and need set the parameters:
Remote Server Addr and Remote Port Number. RS485 TO ETH work in TCP Client won’t accept other
connection request except target server and will access server with random local port if user set local
port to zero.
User can set RS485 TO ETH in TCP Client mode and related parameters by setup software or web
server as follows:

RS485 TO ETH
Figure 6 TCP Client
2.2.2. TCP SERVER
TCP Server will listen network connections and build network connections, commonly 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.
TCP Server mode also support Keep-Alive function.
RS485 TO ETH work 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 RS485 TO
ETH in TCP Server mode simultaneously.
RS485 TO ETH work in TCP Server support 16 client connections at most and will kick off oldest
connection beyond maximum connections(User can enable/disable this function by web server).
User can set RS485 TO ETH in TCP Server mode and related parameters by setup software or web
server as follows:

RS485 TO ETH
Figure 7 TCP Server
2.2.3. UDP CLIENT
UDP transport protocol provides simple and unreliable communication services. No connection
connected/disconnected.
In UDP Client mode, RS485 TO ETH will only communicate with target IP/Port. If data not from target
IP/Port, it won’t be received by RS485 TO ETH.

RS485 TO ETH
In UDP Client mode, if user set remote IP as 255.255.255.255, RS485 TO ETH can broadcast to entire
network segment and receive broadcast data. After firmware version 4015, 304 support broadcasting
in same network segment.(Such like xxx.xxx.xxx.255 broadcasting way).
User can set RS485 TO ETH in UDP Client mode and related parameters by setup software or web
server as follows:
2.2.4. UDP SERVER
In UDP Server mode, RS485 TO ETH will change target IP every time after receiving UDP data from a
new IP/Port and will send data to latest communication IP/Port.
Figure 8 UDP Client

RS485 TO ETH
User can set RS485 TO ETH in UDP Server mode and related parameters by setup software or web
server as follows:
2.2.5. HTTPD CLIENT
In HTTPD Client mode, RS485 TO ETH can achieve data transmission between serial port device and
HTTP server. User just need set RS485 TO ETH in HTTPD Client and set the HTTPD 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.
Figure 9 UDP Server

RS485 TO ETH
User can set RS485 TO ETH in HTTPD Client mode and related parameters by web server as follow:
Figure 10 HTTPD Client
2.3. SERIAL PORT
2.3.1. SERIAL PORT BASIC PARAMETERS
Table 1 Serial Port Parameters
2.3.2. VCOM APPLICATION
User can download VCOM software from Waveshare Wiki. Through this software user can set up
connection between RS485 TO ETH and virtual serial to solve the problem that traditional equipment
PC software used in serial port communication way.
2.3.3. SERIAL PACKAGE METHODS
Parameters
Default
Range
Baud rate
115200
600~230.4Kbps
Data bits
8
5~8
Stop bits
1
1~2
Parity
None
None, Odd, Even, Mark, Space

RS485 TO ETH
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 as Package. There are 2 ways to end the package and send
package to network - Time Trigger Mode and Length Trigger Mode.
RS485 TO ETH adopt fixed Package time (four bytes sending time) and fixed Package length (400
bytes).
2.3.4. BAUD RATE SYNCHRONIZATION
When module works with USR devices or software, serial parameter will change dynamically
according to network protocol. Customer can modify serial parameter by sending data conformed
to specific protocol via network. It is temporary, when restart module, the parameters back to original
parameters.
User can adopt Baud Rate Synchronization function by setup software as follows:
Figure 11 Baud Rate Synchronization

RS485 TO ETH
2.4. FEATURES
2.4.1. IDENTITY PACKET FUNCTION
Identity packet is used for identifying the device when module works as TCP client/UDP client. There
are two sending methods for identity packet.
⚫Identity data will be sent when connection is established.
⚫Identity data will be add on the front of every data packet.
Identity packet can be MAC address or user editable data (User editable data at most 40 bytes). User
can set RS485 TO ETH with Identity Packet function by web server as follow:
2.4.2. HEARTBEAT PACKET FUNCTION
Figure 12 Identity Packet Application Diagram
Figure 13 Identity Packet

RS485 TO ETH
Heartbeat packet: Module will output heartbeat data to serial or network periodic. User can configure
the heartbeat data and time interval. Serial heartbeat data can be used for polling Modbus data.
Network heartbeat data can be used for showing connection status and keep the connection (only
take effect in TCP/UDP Client mode).
User can set RS485 TO ETH with Heartbeat Packet function by web server as follow:
2.4.3. EDITABLE WEB SERVER
RS485 TO ETH support user modify the web server based on template according to needs, then use
related tool to upgrade. If user have this demand can contact to our salespersons for web server
source and tool.
2.4.4. RESET FUNCTION
When 304 work in TCP Client mode, 304 will connect to TCP Server. When user open Reset function,
304 will restart after trying to connect to TCP Server 30 times but still can’t connect to.
User can enable/disable the Reset function by setup software as follow:
Figure 14 Heartbeat Packet

RS485 TO ETH
Figure 15 Reset Function
2.4.5. INDEX FUNCTION
Index function: Used in situation when 304 work in TCP Server mode and establish more than one
connection to TCP Client. After open Index function, 304 will mark every TCP Client to distinguish
them. User can send/receive data to/from different TCP Client according to their unique mark.
User can enable/disable the Index function by setup software as follow:
Figure 16 Index Function

RS485 TO ETH
2.4.6. TCP SERVER SETTING
304 work in TCP Server mode allow at most 16 TCP Clients connection. Default is 4 TCP Clients and
user can change maximum TCP Clients connection by web server. When TCP Clients more than 4, user
need make every connection data less than 200 bytes/s.
If TCP Clients connected to 304 exceed maximum TCP Clients, user can enable/disable kick off old
connection function by web server.
User can set above TCP Server settings by web server as follow:
2.4.7. NON-PERSISTENT CONNECTION
RS485 TO ETH support non-persistent connection function in TCP Client mode. When RS485 TO ETH
adopt this function, RS485 TO ETH will connect to server and send data after receiving data from
Figure 17 TCP Server Setting

RS485 TO ETH
serial port side and will disconnect to server after sending all the data to server and no data from
serial port side or network side over a fixed time. This fixed time can be 2~255s, default is 3s. User can
set RS485 TO ETH with non-persistent connection function by web server as follow:
2.4.8. TIMEOUT RESET FUNCTION
Timeout reset function(no data reset): If network side no data transmission beyond a fixed time(User
can set this fixed time between 60~65535s, default is 3600s. If user set a time less than 60s, this
function will be disable), 304 will reset. User can set the Timeout Reset function by web server as
follow:
Figure 18 Non-persistent Connection
Figure 19 Timeout Reset Function