MATLAB XPC TARGET 4 - DEVICE DRIVERS Dokumentacja Pobierz pdf (Strona 37)

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RS-232 Synchronous Mode

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RS-232 Synchronous Mode

Use synchronous mode when you need to receive a response before continuing

with other computations. In synchronous mode, data is sent to an external

device and the driver block waits for a response. In other words, the I/O driver

blocks or stops execution of the target application until an answer is received

from the external device or it reaches a timeout.

This section includes the following topics:

•

Adding RS-232 Driver Blocks (Synchronous) — Add the setup, send, and

receive blocks you need to your Simulink model for RS-232 communicating.

•

Creating RS-232 Message Structures (Synchronous) — Create the

initialize, send/receive, and termination message structures you need in the

MATLAB workspace.

For the example in this section, assume an external device (RS-232 device)

includes a D/A conversion module with four independent channels and an

output voltage range of -10 to 10 volts. Also assume that the external device

outputs a new voltage if it receives a serial string with a value to identify the

D/A channel and the voltage value.

Use a constant block as an input to the Send/Receive block to select the D/A

channel, and a Signal Generator block as a source for voltage values. Also, set

up the message structures to receive a confirmation message from the external

module after the target PC sends a message string to the device.

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