PUSR USR-TCP232-302 User manual

USR-TCP232-30x Series User Manual
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Serial to Ethernet
(Cost effective)
Be Honest & Do Best
Your Trustworthy Smart Industrial IoT Partner
User Manual
USR-TCP232-302/304/306
V2.0

USR-TCP232-30x Series User Manual
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Content
1. Introduction ...............................................................................................................................................- 4 -
1.1. Overview...........................................................................................................................................- 4 -
1.2. Features............................................................................................................................................- 4 -
2. Get Started.................................................................................................................................................- 5 -
2.1. Hardware interface introduction........................................................................................................- 5 -
2.1.1. Power supply...........................................................................................................................- 5 -
2.1.2. Serial port................................................................................................................................- 6 -
2.1.3. Ethernet port............................................................................................................................- 6 -
2.1.4. LED indicators..........................................................................................................................- 7 -
2.1.5. Reload button..........................................................................................................................- 7 -
2.1.6. Factory default setting .............................................................................................................- 8 -
2.2. Quick test..........................................................................................................................................- 8 -
2.2.1. Download software..................................................................................................................- 8 -
2.2.2. Hardware connection.............................................................................................................- 10 -
2.2.3. Parameter configuration ........................................................................................................- 10 -
2.2.4. Data transmission test............................................................................................................- 13 -
2.2.5. Technical support and assistance...........................................................................................- 14 -
3. Configuration and parameter details ........................................................................................................- 14 -
3.1. Web interface..................................................................................................................................- 14 -
3.1.1. Status .................................................................................................................................... - 15 -
3.1.2. IP settings.............................................................................................................................. - 17 -
3.1.3. Serial port settings ................................................................................................................. - 18 -
3.1.4. Expand function settings........................................................................................................- 20 -
3.1.5. Miscellaneous settings ...........................................................................................................- 22 -
3.2. Configuration software....................................................................................................................- 23 -
3.2.1. Search device ........................................................................................................................- 23 -
3.2.2. Parameter settings................................................................................................................. - 24 -
3.2.3. Open web server....................................................................................................................- 24 -
3.2.4. Firmware upgrade .................................................................................................................- 25 -
3.2.5. Restart the device ..................................................................................................................- 26 -
3.2.6. Restore to factory default settings ..........................................................................................- 26 -

USR-TCP232-30x Series User Manual
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4. Operation mode....................................................................................................................................... - 27 -
4.1. TCP server.......................................................................................................................................- 27 -
4.2. TCP client ........................................................................................................................................- 28 -
4.3. UDP server ......................................................................................................................................- 30 -
4.4. UDP client .......................................................................................................................................- 32 -
4.4.1. Transparent data transmission............................................................................................... - 32 -
4.4.2. Broadcast ..............................................................................................................................- 33 -
4.4.3. Multicast ...............................................................................................................................- 34 -
4.5. HTTP client ......................................................................................................................................- 35 -
5. Modbus Gateway .....................................................................................................................................- 36 -
5.1. Modbus RTU to Modbus TCP.............................................................................................................- 36 -
5.1.1. Ethernet master with serial slave ............................................................................................ - 37 -
5.1.2. Serial master with Ethernet slave............................................................................................ - 38 -
5.2. Multi-host Modbus polling...............................................................................................................- 40 -
6. Additional features...................................................................................................................................- 41 -
6.1. Built-in webpage ............................................................................................................................- 41 -
6.1.1. Edit webpage file....................................................................................................................- 41 -
6.1.2. Upgrade the webpage file......................................................................................................- 41 -
6.2. Index function.................................................................................................................................- 42 -
7. Warranty.................................................................................................................................................. - 43 -
8. Contact Us................................................................................................................................................ - 43 -
9. Disclaimer................................................................................................................................................- 44 -

USR-TCP232-30x Series User Manual
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1. Introduction
1.1. Overview
USR-TCP232-302, USR-TCP232-304 and USR-TCP232-306 are cost-effective serial to Ethernet converter. They
adopt Cortex-M0 solution, which has a main frequency up to 48MHz, providing fast transmission speed.
Equipped with RS232/RS485/RS422 serial port and 10/100M Ethernet port, those products can connect to variety
of serial devices to achieve transparent transmission via simple configuration to save manpower and shorten the
development cycle. These products are widely used in smart traffic, unattended Weighing, manufacturing
industry etc.
USR-TCP232-302, 304 and 306 are identical in software features, they both support transparent data
transmission, Modbus gateway, user-defined webpage, heartbeat packet, registration packet, index function etc.
In hardware, TCP232-302 is RS232 to Ethernet converter, TCP232-304 is RS485 to Ethernet, TCP232-306
supports RS485/RS232/RS422, but RS485/RS232/RS422 can’t work at the same time.
Table 1. Ordering Guide
Model
Description
USR-TCP232-302
1 x RS232, DB9 female, DC 5.5*2.1 power supply: 5~7 V
USR-TCP232-304
1 x RS485, 3P connector, DC 5.5*2.1 power supply: 5~7 V
USR-TCP232-306
1 x RS232/485/422, 4P connector + DB9 male, DC 5.5*2.1 & block terminal power
supply:5 ~ 36V
1.2. Features
•ARM core, Cortex-M0 solution, equipped with deeply optimized TCP/IP protocol stack. It has low latency
and strong scalability, stable and reliable.
•Supports custom webpage function to help users improve brand influence.
•1.5KV built-in network Magnetic Isolation.
•Wide baud rate: 600~460.8 Kbps, multiple parity bit: NONE, Odd, Even, Space, Mark
•Supports Modbus RTU to Modbus TCP protocol conversion and multi-host polling.
•Supports keepalive mechanism to quickly detect the dead connections and reconnect.
•Supports hardware and software watchdog, automatically restarts when the device goes down.
•10/100Mbps Ethernet port and support Auto MDI/MDIX.
•Supports a wide industrial operating temperature, -25℃~75℃.
•Versatile operation modes: TCP Server, TCP Client, UDP, HTTP client.
•Support virtual COM, COM Port Redirector USR-VCOM (windows).

USR-TCP232-30x Series User Manual
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•Easy to config: built-in webpage and AT command to set parameters.
2. Get Started
2.1. Hardware interface introduction
2.1.1. Power supply
The USR-TCP232-302 and USR-TCP232-304 provide DC jack power supply interface. Power supply range:
5~7V DC.
Figure 1. TCP232-302/304 DC power supply
The USR-TCP232-306 provides 2-pin power supply terminal blocks and DC jack. The power supply support
anti-reverse protection. Power supply range: 5~36V DC.
Figure 2. TCP232-306 power supply

USR-TCP232-30x Series User Manual
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2.1.2. Serial port
Table 2. Serial port pin description
Model
Type
Description
USR-TCP232-302
RS232, DB9 female
2: RxD
3: TxD
5: GND
USR-TCP232-304
RS485
A: Data+
B: Data-
USR-TCP232-306
RS232, DB9 male
2: TxD
3: RxD
5: GND
RS485/RS422
For RS485
A: Data+
B: Data-
For RS422
T+: Transmit data (+)
T-: Transmit data (-)
R+: Receive data (+)
R-: Receive data (-)
2.1.3. Ethernet port
USR-TCP232-30x series adopt 10Base-T/100Base-TX adaptive Ethernet RJ45 interface which supports
automatic MDI/MDIX connection.
Figure 3. RJ45 with light

USR-TCP232-30x Series User Manual
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Table 3. Ethernet pin assignment
Pin number
Signal name
1
Send data+(TD+)
2
Send data-(TD-)
3
Receive data+(RD+)
6
Receive data-(RD-)
4, 5, 7, 8
Unused
2.1.4. LED indicators
In USR-TCP232-30x series, only USR-TCP232-306 has LED indicators. The LED indicators description is in the
following table.
Table 4. LED indicators description
LED name
Status
Description
Power
ON
Power supply is normal
OFF
No power supply or abnormal power supply
Work
Blinking
System is booted up and running
Link
ON
TCP connection is established, or the device works
in UDP mode
TX
Blinking
Serial port is transmitting data
RX
Blinking
Serial port is receiving data
2.1.5. Reload button
After the USR-TCP232-30x is powered on, keep pressing the reload button for 3~15 seconds and then release
to restore the 30x device to the factory default settings.

USR-TCP232-30x Series User Manual
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Figure 4. Reload button
2.1.6. Factory default setting
The USR-TCP232-30x serial device server comes with the following default setting.
Table 5. Default parameter
Parameter
Default Values
Username
admin
Password
admin
Device IP
192.168.0.7
Subnet Mask
255.255.255.0
Gateway IP
192.168.0.1
COM port
115200, N, 8, 1
COM operation mode
TCP client
2.2. Quick test
USR-TCP232-30x series serial server has a built-in Web server, which provides a convenient way to access
and configure the serial server. Users can use Edge, Firefox or Google browser to access it. This chapter is a quick
introduction to the USR-TCP232-30x series of serial server products. It is recommended that users read this
chapter and follow the instructions once for the system, and you will have a basic understanding of the product.
For specific function details and instructions, please refer to the subsequent chapters.
2.2.1. Download software
Download the software from PUSR’s website:
Config software: 插入设置软件下载链接
Test software: https://www.pusr.com/support/download/usr-tcp232-test-V13.html
After downloading, run the config software. It is strongly recommended for the users to set the Network
Parameters through configuration tool first. Other device-specific configurations can later be carried out via
user-friendly Web-Interface.

USR-TCP232-30x Series User Manual
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Figure 5. Config software
Figure 6. Test software

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2.2.2. Hardware connection
For fast networking of USR-TCP232-30x series serial server, you need to prepare a PC, a router, a serial server,
a network cable, a serial cable, and a DC5V/1A power supply. The hardware connection is shown in following
figure. To establish a TCP / IP network all devices must be connected to the same network either locally or via
gateway connections.
Figure 7. Hardware connection
2.2.3. Parameter configuration
Using the config software,
1. Users can search out the 30x device,
2. Set the IP type as DHCP/Auto IP,
3. Save config,
4. Search the device again,
5. Open the webpage，the user will be navigated to the login page, the username and password are both
“admin”.