1.1. Application Diagram
1.2. Hardware Design
1.2.1. Hardware Dimensions
1.2.2. DB9 Pin definition
1.2.3. RS422/RS485 Pin definition
RS422: R+/R- are RS422 RXD pins and T+/T- are RS422 TXD pins.
RS485: A/B are RS485 RXD/TXD pins.
1.2.4. LED
2. Product Functions
This chapter introduces the functions of USR-TCP232-306 as the following diagram shown, you can get an overall
knowledge of it
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:
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:
2.2. Socket functions
TCP232-306 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.
TCP232-306 work in TCP Client mode need connect to TCP Server and need set the parameters: Remote Server
Addr and Remote Port Number. TCP232-306 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 TCP232-306 in TCP Client mode and related parameters by setup software or web server as follows:
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.
TCP232-306 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 TCP232-306 in TCP Server
mode simultaneously.
TCP232-306 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 TCP232-306 in TCP Server mode and related parameters by setup software or web server as follows:
2.2.3. UDP Client
UDP transport protocol provides simple and unreliable communication services. No connection connected
/disconnected.
In UDP Client mode, TCP232-306 will only communicate with target IP/Port. If data not from target IP/Port, it
won’t be received by TCP232-306.
In UDP Client mode, if user set remote IP as 255.255.255.255, TCP232-306 can broadcast to entire network
segment and receive broadcast data. After firmware version 4015, 306 support broadcasting in same network
segment.(Such like xxx.xxx.xxx.255 broadcasting way).
User can set TCP232-306 in UDP Client mode and related parameters by setup software or web server as follows:
2.2.4. UDP Server
In UDP Server mode, TCP232-306 will change target IP every time after receiving UDP data from a new IP/Port
and will send data to latest communication IP/Port.
User can set TCP232-306 in UDP Server mode and related parameters by setup software or web server as follows:
2.2.5. HTTPD Client
In HTTPD Client mode, TCP232-306 can achieve data transmission between serial port device and HTTP server.
User just need set TCP232-306 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.
User can set TCP232-306 in HTTPD Client mode and related parameters by web server as follow:
2.3. Serial port
TCP232-306 support RS232/RS485/RS422. User can refer to 1.2.2. DB9 Pin definition 1.2.3. RS422/RS485
Pin definition to connect and RS232/RS485/RS422 can’t be used simultaneously.
2.3.1. Serial port basic parameters
2.3.2. VCOM Application
User can download VCOM software from http://www.usriot.com/usr-vcom-virtual-serial-software/. Through
this software user can set up connection between TCP232-306 and virtual serial to solve the problem that
traditional equipment PC software used in serial port communication way.
2.3.3. Serial Package Methods
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.
TCP232-306 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:
2.4. Features
2.4.1. Identity Packet Function
Identity packet is used for identify 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
TCP232-306 with Identity Packet function by web server as follow:
2.4.2. Heartbeat Packet Function
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). Heartbeat packet allow 40 bytes at most.
User can set TCP232-306 with Heartbeat Packet function by web server as follow:
2.4.3. Editable Web server
TCP232-306 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 306 work in TCP Client mode, 306 will connect to TCP Server. When user open Reset function, 306 will
restart after trying connecting to TCP Server 30 times but still can’t connect to.
User can enable/disable the Reset function by setup software as follow:
2.4.5. Index function
Index function: Used in situation when 306 work in TCP Server mode and establish more than one connection to
TCP Client. After open Index function, 306 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:
2.4.6. TCP Server setting
306 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 306 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
TCP232-306 support non-persistent connection function in TCP Client mode. When TCP232-306 adopt this
function, TCP232-306 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 or network side over a
fixed time. This fixed time can be 2~255s, default is 3s. User can set TCP232-306 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), 306
will reset. User can set the Timeout Reset function by web server as follow:
3. Parameter Setting
There are three ways to configure USR-TCP232-306. They are setup software configuration, web server
configuration and AT command configuration.
3.1. Setup software Configuration
When user want to configure the TCP232-306 by setup software, user can run setup software, search TCP232-306 in same LAN and configure the TCP232-306 as follow:
After researching TCP232-306 and clicking TCP232-306 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.
3.2. Web Server Configuration
User can connect PC to TCP232-306 through LAN port and enter web server to configure.
Web server default parameters as follow:
After firstly connecting PC to TCP232-306, 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 into web server. Web server screenshot as follow:
4.Disclaimer
This document provide the information of USR-TCP232-306 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 merchantability 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.
