The tSH-735i module is a serial port sharer with 3 RS-485 ports that provides a number of functions, including "Baud Rate Conversion", "Modbus RTU/ASCII Conversion" and "Two Masters Share One Slave". It has a built-in web server that provides a configurable interface. No console commands are required.
This device has Baud Rate and Modbus RTU/ASCII Conversion features. The Baud Rate Conversion makes it possible communication between master and slave devices. It allows for differences in baud rates and data formats to be sent. 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.
- 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
- Allows automatic RS-485 direction control
- Tiny form-factor and low power consumption
- Baud Rate Conversion
- Modbus RTU/ASCII Conversion
- Allows Two Master Devices to Access a Slave Device
Modbus Protocol and Baud Rate Conversion Function
Baud Rate Conversion in Raw Data Mode
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.
Allow a Modbus RTU/ASCII Master device to communicate with a Modbus RTU/ASCII Slave device with different Protocol, Baud Rate or Data Format.
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.
- Office Lighting Control Application
- Production Line Application
Connect the two uplink serial ports on the tSH-735i 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-735i 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.
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.
Reference & Support
10/100 Base-TX, 8-pin RJ-45 x 1 (Auto-negotiating, Auto-MDI/MDIX, LED indicator) PoE (IEEE 802.3af, Class 1)
Yes, automatic RS-485 direction control
Yes, 1 KΩ
16c550 or compatible
2500 VDC for only tDS-712i / 722i / 732i / 715i / 725i / 735i / 718i / 724i / 734i
+/-4 kV for only tDS-712i / 722i / 732i / 715i / 725i / 735i / 718i / 724i / 734i
COM Port Format
115200 bps Max.
5, 6, 7, 8
None, Odd, Even, Mark, Space
IEEE 802.3af, Class 1
+12 ~ 48 VDC
0.07 A @ 24 VDC
10-Pin Removable Terminal Block x 1
-25 ~ +75°C
-30 ~ +80°C
10 ~ 90% RH, non-condensing