Modem Status

R2026b

Return state of modem control lines

• 

Modem Status block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink Real-Time / RS232 / Mainboard

Description

The Modem Status block reads the state of the input modem control lines on the Speedgoat^® target computer.

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.

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

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

Block Parameter: 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

Block Parameter: 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

Block Parameter: dcd

Sample time — Sample time of block

0.01 (default) | numeric

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

Programmatic Use

Block Parameter: sampletime

Serial port type — Port type that is being accessed

Legacy Serial Port (default) | USB Serial Port | Specify

Specify the serial port type for communications. Choose Legacy Serial Port or USB Serial Port to specify the type of port used. Or, choose Specify to manually specify the path of the port used. For more information about serial ports, see RS-232 Serial Communication.

Dependencies

Setting Serial port type to Legacy Serial Port or USB Serial Port displays the Serial port number parameter in which you can specify the port number.

Setting Serial port type to Specify displays the Serial port parameter in which you can specify the port path.

Programmatic Use

Block Parameter: portType

Serial port number — Port number that is being accessed

1 (default) | positive integer

Specify the serial port number for communications.

If using USB-to-serial adapters, the target computer detects these adapters as ttySUSB0, ttySUSB1, 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.

Dependencies

This parameter is visible if Serial port type is set to Legacy Serial Port or USB Serial Port.

Programmatic Use

Block Parameter: portNum

Serial port — Serial port device path that is being accessed

/dev/ttyS0 (default) | node path

Specify the serial port device path for communications. The path can be the device path of a Legacy Serial Port or USB Serial Port.

Dependencies

This parameter is visible if Serial port type is set to Specify.

Programmatic Use

Block Parameter: nodePath

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"slrealtimeseriallib/Mainboard/Modem Status"

Example: add_block("slrealtimeseriallib/Mainboard/Modem Status","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

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

Version History

Introduced in R2020b