Tiny Addressable Serial Converter

There are many RS-232 devices that are used in industrial applications. Nowadays, it has become important to link all these RS-232 devices together for automation purposes and for extracting information. Usually, those RS-232 devices are at a distance from the host PC and may be widely distributed throughout the factory. Consequently, it is not a good idea to use multiple serial cards to connect all these RS-232 devices together. The tM-752N can be used to link multiple distributed RS-232 devices using a single RS-485 network. The RS-485 is renowned for its easy maintenance, simple cabling, stability, reliability and low cost.

The tM-752N series supports the DCON protocol (compatible with I-752N series), allowing users to modify the settings of the module, such as the serial port configuration and the operation mode, etc. The module also has a built-in web server which provides an intuitive web management interface that simplifies the configuration of the module.

The tM-752N series module is equipped with a 1 KB queue buffer for its local RS-232 device. All data can be stored in the queue buffer until the host PC has time to read it. This feature allows the host PC to link to many low-speed RS-232 devices without suffering any data loss, and also makes it easier for baud rate converter applications to be implemented.



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    The built-in Self-Tuner ASIC on an RS-485 port can automatically detect and control the send/receive direction of the RS-485 network. Consequently, there is no need for application programs to be concerned with direction control of the RS-485 network.

    Most RS-232 devices don’t support device addressing. The ICP DAS tM-752N series module assigns a unique address for each RS-232 device installed. When a command with a device address is sent to the RS-485 network, the destination tM-752N module removes the address field, and then passes the commands to the specified local RS-232 device. The response from the local RS-232 device will be returned to the host PC via the tM-752N.



    Factory, Building and Home Automation


    • Integrates any RS-232/485 serial device
    • Contains a high-performance 32-bit MCU
    • 10/100 Base-TX Ethernet, RJ-45 x1
      (Auto-negotiating, auto MDI/MDIX, LED Indicators)
    • Includes redundant power inputs: PoE and DC jack
    • Provides automatic RS-485 direction control
    • Includes a UDP responder for device discovery
    • Supports easy firmware updates via the Ethernet
    • Contains a tiny web server for configuration
    • Terminal block connector for easy wiring
    • Tiny form-factor and low power consumption
    • RoHS compliant & no Halogen
    • Cost-effective with a low channel count


    Hardware Specifications

    Models tM-7521 tM-7522
    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 2-wire RS-485
    COM2 3-wire RS-232 3-wire RS-232
    COM3 3-wire RS-232
    Self-Tuner Yes, automatic RS-485 direction control
    RS-485 Bias Resistor Yes, 10 KΩ
    Node 32 (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
    Flammability Fire Retardant Materials (UL94-V0 Level)
    Operating Temperature -25 ~ +75 °C
    Storage Temperature -30 ~ +80 °C
    Humidity 10 ~ 90% RH, non-condensing

    Ordering Informations

    tM-7521 CR Tiny Addressable Serial Converter with PoE and 1 RS-232 and 1 RS-485 Ports (RoHS)
    tM-7522 CR Tiny Addressable Serial Converter with PoE and 2 RS-232 and 1 RS-485 Ports (RoHS)