GPIB I/O Support (xPC Target)

xPC Target

GPIB Initialization and Termination Message Structures

The format for the initialization and termination structures are similar to the send/receive structure except for a few differences:

The initialization and termination structures do not need to receive or send information through driver block ports on your Simulink model. Therefore, the initialization and termination structures do not use the message fields .InputPorts, .OutputPorts, .RecData, and .OutputDataTypes.

Below is a description of the possible message fields for the initialization and termination structures. The order of the message fields does not matter. However, the field names are case sensitive.

Message Fields
Description

Address

Sets the GPIB address for the device being accessed and defines the keyword ADDR. Default value = [].

Command

GPIB command sent to a GPIB device. Default value = ''.

SendData

Data sent with the GPIB command. Default value = ''.

RdLength

Defines the length of the acknowledge string, in bytes, from the GPIB controller.

Ack

The expected acknowledge string from the controller as a result of an initialization or termination message. If this value is set, you need to set the time-out value. If no string is defined, then no acknowledge is expected.

Timeout

Time, in seconds, allowed for the GPIB controller to respond to a message and send back an acknowledge string. Default value = 0.049 seconds.

If the time-out value is exceeded, a time-out error is reported.

Message Fields	Description
Address	Sets the GPIB address for the device being accessed and defines the keyword ADDR. Default value = `[]`.
Command	GPIB command sent to a GPIB device. Default value = `''`.
SendData	Data sent with the GPIB command. Default value = `''`.
RdLength	Defines the length of the acknowledge string, in bytes, from the GPIB controller.
Ack	The expected acknowledge string from the controller as a result of an initialization or termination message. If this value is set, you need to set the time-out value. If no string is defined, then no acknowledge is expected.
Timeout	Time, in seconds, allowed for the GPIB controller to respond to a message and send back an acknowledge string. Default value = `0.049` seconds. If the time-out value is exceeded, a time-out error is reported.

GPIB MATLAB Structure Reference GPIB Send/Receive Message Structure