tM-7521 Tiny Addressable (1x RS-232) to RS-485 Converter


Key Features

  • Integrates any RS-232 serial device
  • Includes redundant power inputs: PoE and DC jack
  • Provides automatic RS-485 direction control
  • Includes a UDP responder for device discovery
  • Provides an intuitive web configuration interface
  • Terminal block connector for easy wiring
  • Tiny form-factor and low power consumption
  • Operating Temperatures, -25 °C ~ +75 °C
  • DIN-Rail mountable


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 ICP DAS tM-7521 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 ICP DAS tM-7521 is non-programmable and cost-effective module, while the I-7521 is programmable.

Easy Configuration (DCON & Web)
The ICP DAS tM-752N series supports the DCON protocol, 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.

Onboard 1 KB Queue buffer
The ICP DAS 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.

Self-Tuner ASIC inside
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.

Addressable RS-232 to RS-485 Converter
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 series.