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Serial I/O Module Supporting RS232/RS422/RS485

The IO581 I/O module is a 4-channel, RS232-, RS422- and RS485-capable asynchronous serial module with Simulink® driver blocks.

The serial channels offer high flexibility as they are individually programmable. The maximum supported baud rate for RS232 is 1 Mbps and 10 Mbps for RS422/RS485. The termination is software-selectable for RS422 and RS485.

This I/O module is ideal for closed-loop controls and hardware-in-the-loop (HIL) simulations using MATLAB® and Simulink.

Key Features

  • 4 channels individually programmable as RS232, RS422 or RS485 (half and full duplex )
  • RS232 baud rate up to 1 Mbps
  • RS422/RS485 baud rate up to 10 Mbps
  • RS422/RS485 termination resistors can be installed for each port pair on request
  • 256-byte hardware FIFO
Form factor mPCIe
Power requirements 0.462W @ +3.3 V DC
Electrical interface PCI Express
Connectors 4x 9-pin D-sub connector
Operating temperature -40 °C to +85 °C
Relative humidity 5 to 95 %, non-condensing
Number of channels 4
Transceiver Software selectable RS232, RS422, RS485 (half and full duplex)
Programmable baud rates

RS232: up to 1 Mbps
RS422/RS485: up to 10 Mbps

I/O signals RS232: TxD, RxD, RTS, CTS, GND
RS422/RS485 half duplex: Dx +/-, GND
RS422/RS485 full duplex: TxD +/-, RxD +/-, GND
Termination Default configuration: RS232 (no termination resistors installed).
Termination resistors for RS422/RS485 can be installed for each port pair during assembly (upon request).

±15 kV ESD rating

Item ID Product Name Components
20581X* IO581
  • 1x IO581 I/O module
  • Driver block library for Simulink Real-Time
  • Comprehensive documentation and Simulink example models
  • Installation into the real-time target machine

Key to X in Item ID
*Please replace the X with the code number of the specific target machine into which this I/O module will be installed:

  • 7 = Unit real-time target machine
  • 8 = Baseline real-time target machine

Pricing information
We do not publish pricing information on our website. Upon request by e-mail or phone, we can provide a complete price list covering our entire product portfolio in various currencies. We recommend that you contact us to discuss your specific needs. We can then quickly provide you with a tailored quotation including technical and pricing information.


Included in delivery

Common Applications

Supported target machines


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