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Modem Control

Control state of RTS and DTR output lines on serial port

  • Library:
  • Simulink Real-Time / RS232 / Mainboard

  • Modem Control block

Description

The Modem Control block controls the state of either or both of the RTS and DTR output lines on the serial port. To choose which output lines to control, select the RTS and DTR parameters.

Ports

Input

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The behavior of the block is:

  • RTS > 0.5 — The block asserts the RTS control bit to true. The output goes to a positive voltage.

  • RTS ≤ 0.5 — The block asserts the RTS control bit to false. The output goes to a negative voltage.

Dependency

If the RTS parameter is off, this input has no effect.

The behavior of the block is:

  • DTR > 0.5 — The block asserts the DTR control bit to true. The output goes to a positive voltage.

  • DTR ≤ 0.5 — The block asserts the DTR control bit to false. The output goes to a negative voltage.

Dependency

If the DTR parameter is off, this input has no effect.

Parameters

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Select this check box to control the RTS line for this board.

Programmatic Use

rts

Select this check box to control the DTR line for this port.

Programmatic Use

dtr

Selects the RS232 serial port for communications.

Programmatic Use

port
Introduced in R2020b