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Legacy Serial Port F

Send and receive data over mainboard baseboard serial port with FIFO

  • Legacy Serial Port F block

Simulink Real-Time / RS232 / Mainboard


The Send/Receive FIFO block sets up the serial interface to send and receive character and binary streams. It transmits input data as does the Send/Receive block, but it propagates received data through First In, First Out (FIFO) outputs.

A model that contains a Send/Receive FIFO block and the FIFO Read block provides the same capability as the Send/Receive block. A model that contains a Send/Receive FIFO block and a FIFO Read HDRS or FIFO Read Binary block provides greater capability than the Send/Receive block.



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Vector of the data used to transmit over the port.

Data Types: int8 | int16 | int32 | uint8 | uint16 | uint32


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First In, First Out (FIFO) containing data that has been received from the serial port.


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This parameter specifies the port for which you want to view or modify parameters. 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

Block Parameter: port

Select a baud for transmitting and receiving data through the modem.

Programmatic Use

Block Parameter: baud

Select the number of bits that encode a character.

Programmatic Use

Block Parameter: width

Select the number of stop bits for the character stream.

Programmatic Use

Block Parameter: nstop

Select a parity for checking data integrity.

Programmatic Use

Block Parameter: parity

To enable the Request To Send/Clear To Send (RTS/CTS) handshake of the Universal Asynchronous Receiver-Transmitter (UART) for flow control, select this check box. Serial controllers use the RTS/CTS handshake to prevent data loss due to hardware FIFO overflow on the device that you are sending to.

Usually, the interrupt service routine executes quickly enough to empty the FIFO. If your model gets FIFO overruns, select this check box.

Programmatic Use

Block Parameter: ctsmode

This parameter specifies the port for which you want to view or modify parameters. On the Simulink® block, the upper port is port 1 and the lower port is port 2.

Programmatic Use

Block Parameter: port

This parameter specifies the receive FIFO size in bytes.

Example: 1024

Programmatic Use

Block Parameter: fifosize

Data Types: int32

This parameter specifies the data type of the transmitter. The 8-bit data types require a NULL-terminated character vector in the input vector.

The 16-bit and 32-bit data types reserve the first full element to contain the number of elements to expect in the rest of the input vector. Only the low-order byte of each data element is sent. Setting this data type enables a wider data type to hold the bytes.

If the data stream requires a NULL byte, select one of the 16-bit or 32-bit data types. Because the 8-bit data types are NULL-terminated character vectors, the NULL byte terminates the character vector.

Programmatic Use

Block Parameter: idtype

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

Programmatic Use

Block Parameter: sampletime

Version History

Introduced in R2008a

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