Modem Control

Control state of RTS and DTR output lines on serial port

Since R2020b

• 

Libraries:
Simulink Real-Time / RS232 / Mainboard

Description

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

Examples

ASCII Encoding/Decoding Loopback Test

Send ASCII data over a serial link.

Open Script

ASCII Encoding/Decoding Resync Loopback Test

Use the ability of the FIFO Read HDRS block to resynchronize after being repeatedly disabled and apply this ability to resolve errors such as when a message is only partially complete at the time the read is attempted.

Open Script

Binary Encoding/Decoding Loopback Test

Send Binary data over a serial link.

Open Script

Binary Encoding/Decoding Resync Loopback Test

Use the ability of the FIFO Read BINARY block to handle messages that are interrupted and only partially complete.

Open Script

Simple ASCII Encoding/Decoding Loopback Test (with Baseboard Blocks)

Convert a single floating point number to ASCII and transmit the value over a serial link.

Open Script

ASCII Encoding/Decoding Loopback Test (with Baseboard Blocks)

Send ASCII data over a serial link.

Open Model

ASCII Encoding/Decoding Resync Loopback Test (with Baseboard Blocks)

Use the ability of the FIFO Read HDRS block to resynchronize after being repeatedly disabled and apply this ability to resolve errors such as when a message is only partially complete at the time the read is attempted.

Open Script

Binary Encoding/Decoding Loopback Test (with Baseboard Blocks)

Send Binary data over a serial link.

Open Script

Binary Encoding/Decoding Resync Loopback Test (with Baseboard Blocks)

Use the ability of the FIFO Read BINARY block to handle messages that are interrupted and only partially complete.

Open Script

Ports

Input

RTS — Level-sensitive signal for setting ready-to-send line

double

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.

DTR — Level-sensitive signal for setting data-terminal-ready line

double

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

RTS — Enable control of RTS line for serial device

on (default) | off

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

Programmatic Use

rts

DTR — Enable control of DTR line for serial device

on (default) | off

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

Programmatic Use

dtr

Serial port — Select serial port

Legacy Serial Port 1 (default) | .. | Legacy Serial Port 8 | USB Serial Port 1 | .. | USB Serial Port 8

Selects the RS232 serial port for communications. If using USB-to-serial adapters, the target computer detects these adapters as serusb1, serusb2, and so on in the order that the adapters are connected to the serial devices. The order of port assignment is retained through the power cycle of the target computer or serial device if there is no change in the connections to the ports.

Programmatic Use

port

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2020b