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Tiny Serial Port Converter with PoE and <b>1 Isolated RS-232</b> and <b>1 Isolated RS-485 Ports (RoHS)</b>


Tiny Serial Port Converter with PoE and 1 Isolated RS-232 and 1 Isolated RS-485 Ports (RoHS)

  Price:  $239.00  

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The tSH-724 module is a tiny serial port sharer with 1 RS-485 port and 1 RS-232 port that provides functions such as "Baud Rate Conversion", "Modbus RTU/ASCII Conversion" and "Two Masters Share One Slave". It has a built-in web server that provides web management interface for easy configuration on a web page.

The Baud Rate Conversion function allows different baud rates and data formats to be sent among master and slave devices. Modbus RTU/ASCII Conversion allows for a single Modbus RTU master device to communicate with Modbus RTU/ASCII slave devices through different protocols, baud rates, and formats. It is very compact, and equipped with removable terminal block connectors for easy wiring. The tSH-724 can also be powered over Ethernet, which complies with true IEEE 802.3af-compliant (Class 1) standard. tSH-700 module is designed for low power consumption - it helps save energy.

  • Raw data mode for most query-response protocols
  • Built-in Web Server for easy configuration (HTTP)
  • Redundant power inputs: PoE (IEEE 802.3af, Class 1) and DC jack
  • Tiny size and low power consumption

    tsh-700 baud rate conversion

  • Baud Rate Conversion
  • Allow a Master device to communicate with Slave devices with different Baud Rate or Data Format. In the Raw Data mode, it can be applied to most of the half-duplex communications that do not require protocol conversion (Request - Response), such as DCON. When the Data Size is less than 512 bytes buffer size (built-in buffer for each serial port), it can perform full-duplex communication.

    tSH-700 feature2

  • Modbus RTU/ASCII Conversion
  • Allow a Modbus RTU/ASCII Master device to communicate with a Modbus RTU/ASCII Slave device with different Protocol, Baud Rate or Data Format.

    tSH-700 feature3

  • Allows Two Master Devices to Access a Slave Device
  • Allows two Master devices to connect to different serial ports and access to the Slave device. Modbus mode can be used to convert Modbus RTU/ASCII protocol, and Raw Data Mode can be used for DCON or other Request - Response protocols. Each serial port can be configured with different Baud Rate or Data Format that depends on connected devices. When two Master devices request the same Modbus information, the built-in Cache function will remove duplicated request message to reduce the load of communication of the Slave device serial port. Note: It may need to set up a longer Timeout for the Upper Computer.

    • Modbus Protocol and Baud Rate Conversion Function

    • tSH-700 feature4

    • Baud Rate Conversion in Raw Data Mode

    • tSH-700 feature5


  • Office Lighting Control Application
  • Connect the two uplink serial ports on the tSH-735 module to the two control panels (Master controller such as TPD/HMI) in the front area as well as the back area of the office. And connect the downlink serial port on the tSH-735 module to the lighting control circuit (RS-485 bus). And then the lighting control of the office can be done by using the Master controller (TPD/HMI) in different locations.

    tSH-700 Office Application

  • Production Line Application
  • In this production line application, the monitoring & control center (HMI/SCADA) is connected to uplink serial ports on the tSH-734 module of the production line 1 and production line 2 via RS-485. And then the on-site Master controller (Panel PC) of the production line 1 and production line 2 are connected to another uplink serial port on the tSH-734 module via RS-232. Furthermore, the downlink serial port on the tSH-734 module is connected to the slave process controller (PAC/PLC) and then each on-site I/O module can be connected to the RS-485 serial port on the slave process controller (PAC/PLC) to achieve monitoring and control of the production process from the Monitoring & control center or from the on-site controllers.

    tSH-700 Application


CPU 32-bit ARM
Communication Interface
Ethernet 10/100 Base-TX, 8-pin RJ-45 x 1 (Auto-negotiating, Auto-MDI/MDIX, LED indicator)
PoE (IEEE 802.3af, Class 1)
COM1 2-wire RS-485
COM2 3-wire RS-232
COM3 -
Self-Tuner Yes, automatic RS-485 direction control
RS-485 Bias Resistor Yes, 1 KΩ
Node 254 (max.)
UART 16c550 or compatible
COM Port Format
Baud Rate 115200 bps Max.
Data Bit 5, 6, 7, 8
Parity None, Odd, Even, Mark, Space
Stop Bit 1, 2
Power Input PoE IEEE 802.3af, Class 1
DC Jack +12 ~ 48 VDC
Power Consumption 0.07 A @ 24 VDC
Connector 10-Pin Removable Terminal Block x 1
Mounting DIN-Rail
Operating Temperature -25°C ~ +75°C (-13°F ~ +167°F)
Storage Temperature -30°F ~ +80°C (-22°F ~ +176°F)
Humidity 10 ~ 90% RH, non-condensing

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