Modem Status

Return state of modem control lines

• Library:

• Simulink Real-Time / RS232 / Mainboard

• 

Description

The Modem Status block reads the state of the input modem control lines.

This block has outputs of type Boolean. If the input voltage is positive, the output is true. If the input voltage is negative, the output is false.

Ports

Output

CTS — Status of clear to send line

true | false

If true, the modem is ready to receive data.

Dependency

To make this output visible, select the CTS parameter.

DSR — Status of data set ready line

true | false

If true, the modem is ready to send and receive data.

Dependency

To make this output visible, select the DSR parameter.

DCD — Status of data carrier detect line

true | false

If true, the modem is receiving a carrier from a remote device.

Dependency

To make this output visible, select the DCD parameter.

Parameters

CTS — Enables clear to send status output

on (default) | off

Select this check box to monitor the CTS line of the modem.

Selecting this parameter makes the CTS port visible.

Programmatic Use

cts

DSR — Enables data set ready status output

on (default) | off

Select this check box to monitor the DSR line of the modem.

Selecting this parameter makes the DSR port visible.

Programmatic Use

dsr

DCD — Enables data carrier detect status output

on (default) | off

Select this check box to monitor the DCD line of the modem.

Selecting this parameter makes the DCD port visible.

Programmatic Use

dcd

Sample time — Sample time of block

-1 (default) | numeric

Enter the base sample time or a multiple of the base sample time. -1 means that sample time is inherited.

Programmatic Use

sampletime

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

Model 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 Script

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

Extended Capabilities

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

Version History

Introduced in R2020b