RS232 I/O Support (xPC Target)

xPC Target

RS-232 Send/Receive Message Structure (Synchronous)

Below are descriptions of the possible message fields for the send /receive structures with asynchronous mode. The order of the fields does not matter. However, the field names are case sensitive.

Message Field
Description

SendData

Data and format sent to the RS-232 device. Default
value = ''.

InputPorts

Number of input ports for the driver block. Data from the input ports is sent to the RS-232 device with the message field.SendData. Default value = []. The highest number you enter determines the number of input ports on the driver block.

For example, the following message creates two input ports on the driver block,

RS232_Send_Receive(1).InputPorts= [1 2];

RecData

Data and format received from the RS-232 device. Default value = ''. The format of this statement is very similar to a scanf statement. The read data is mapped to the output ports defined in the message field .OutputPorts. If a negative output port is given, the data is read in, but not sent to any output port.

OutputPorts

Number of output ports from the driver block. Data received from a RS-232 device is sent to the output ports with the message field .ReceiveData. Default value = []. The highest number you enter determines the number of output ports on the driver block.

For example, to use output ports 1 and 2 on the driver block, type

RS232_Send_Receive.OutputPorts = [1 2];

Timeout

Time, in seconds, the driver block waits for data to be returned. Default value = 0.049.

EOM

Number of characters you use to indicate the end of a message.

Message Field	Description
SendData	Data and format sent to the RS-232 device. Default value = `''`.
InputPorts	Number of input ports for the driver block. Data from the input ports is sent to the RS-232 device with the message field`.SendData`. Default value = `[]`. The highest number you enter determines the number of input ports on the driver block. For example, the following message creates two input ports on the driver block, RS232_Send_Receive(1).InputPorts= [1 2];
RecData	Data and format received from the RS-232 device. Default value = `''`. The format of this statement is very similar to a scanf statement. The read data is mapped to the output ports defined in the message field `.OutputPorts`. If a negative output port is given, the data is read in, but not sent to any output port.
OutputPorts	Number of output ports from the driver block. Data received from a RS-232 device is sent to the output ports with the message field `.ReceiveData`. Default value = `[].` The highest number you enter determines the number of output ports on the driver block. For example, to use output ports 1 and 2 on the driver block, type RS232_Send_Receive.OutputPorts = [1 2];
Timeout	Time, in seconds, the driver block waits for data to be returned. Default value = `0.049`.
EOM	Number of characters you use to indicate the end of a message.

RS-232 MATLAB Structure Reference RS-232 Send Message Structure (Asynchronous)