Block

Mask

Description

This block allows the user to retrieve data received by a Bus Controller (BC) of an SBS MIL-STD-1553 board. The board selection is controlled by the OpAsync_1553_Ctrl block that shares the same Controller ID as this block.

When this block is placed in the model, during the initialization of the MIL-STD-1553 driver in the asynchronous process started by the OpAsync_1553_Ctrl block, the board will be automatically configured to simulate a Bus Controller on the specified bus (A orB).

If this block is used in a model that also uses OpAsync_1553_RT_Sendor Receive blocks, the user must make sure that the selected board has the capability to simulate both MIL-STD-1553 BC and RT features simultaneously.

This block can also be used for receiving mode codes that require a response from a remote terminal.

For more information MIL-1533 RT-LAB Application, check the RT-LAB MIL-1553 Manual.

Parameters

Controller ID	This parameter is used to identify the OpAsync_1553_Ctrl block to which this Receive block is attached. This ID is a literal integer value in the range [0, 255]. An OpAsync_1553_Ctrl block with the same ID as the one specified must exist in the model.
Receive ID	This parameter is used to identify the Receive blocks attached to one specific controller. The asynchronous application uses this information to refer to a particular Receive block.
Sub-device number	Some MIL-1553 board can support more than one MIL-STD-1553 devices. This parameter is used to associate the current Receive block with one of those devices. This parameter can be grayed out or not depending on the specific board selected in the associated OpAsync_1553_Ctrl block.
Bus control operation	This parameter is used to specify the type of operation/command associated with this block. Once an operation is selected the board will be automatically configured at initialization with the required parameters for this command.
Source Remote Terminal	This parameter is used to indicate to which source Remote Terminal the currently selected command refers. For some operations, this parameter is not relevant and will be grayed out. This information will be retrieved by the MIL-STD-1553 driver during initialization in order to allocate the appropriate structures on the card. This value is a literal integer value in the range [0, 30].
Source Sub-Address	This parameter is used to indicate to which source Sub-Address of a specific remote Terminal, the currently selected command refers. This information will automatically be retrieved by the MIL-STD-1553 driver during initialization in order to allocate the appropriate structures on the card. This value is a literal integer value in the range [0, 31].
Destination Remote Terminal	This parameter is used to indicate to which destinationRemote Terminal the currently selected command refers. For some operations, this parameter is not relevant and will be grayed out. This information will automatically be retrieved by the MIL-STD-1553 driver during initialization in order to allocate the appropriate structures on the card. This value is a literal integer value in the range [0, 30].
Destination Sub-Address	This parameter is used to indicate to which destination Sub-Address of a specific destination Remote Terminal, the currently selected command refers. This information will automatically be retrieved by the MIL-STD-1553 driver during initialization in order to allocate the appropriate structures on the card. This value is a literal integer value in the range [0, 31].
Bus number	This parameter is used to indicate on which bus (bus A or bus B) the message is awaited.
Waiting option	This parameter indicates if the block either: Sends the transmission request and halts execution only if another transmission is requested (Send TX command high) while the response of the previous command has not yet been received. This option may cause overruns. Sends the transmission request and immediately stops execution until the data arrives. This option may cause overruns. Never waits
Mode Command	Mode code to be sent if the Bus ControllerOperation is set to MODE.
Send Tx Command	Indicates if the Send Tx Command is an active high/low value with 0.5 thresholds or value in a hertz specifying cyclic repetition of the command.
Use word count input	Produce an additional block input that is used to specify the word count for each transaction. When this parameter is not used, the size of the Data output is used to determine the word count.

Inputs

This block has 2 standard inputs and 1 optional input:

Timeout	Currently unused. Can be set to 0.
Send TX Command	This input is used to launch the transmission of commands by the BC. This input behaves differently depending on the Send TX Command parameter. If Send TX Command is set to Active High and the input signal is high (>0.5), the block sends a transmission request to the designated RT/SA. If Send Tx Command is set to Periodic (Hz), the input must specify a value in Hertz that defines the rate at which the transmission requests are to be performed. The Waiting Mode option determines if the data is to be expected during the current step or a subsequent step.
Requested word count	(optional) Used only if the Use word count input parameter is checked. Specifies the word count of the transaction to be performed.

Outputs

This block has 4 outputs.

Error: This output reports one of the following values:

Value	Description
0	No errors.
-1	An error occurred during initialization and the asynchronous process has terminated. Consult the RT-LAB Display for details.
-2	An exception occurred. Please contact the Opal-RT support team should this be reported. Also consult the RT-LAB Display for possible details.
-7	Invalid word count. The value requested at the Word Count input is outside of the valid range (1 to 32) or higher than the width of the Data output.
-11	A reception error occurred. This usually means that a remote terminal did not reply to the reception request from the bus controller or failed to deliver a status word response before the timeout specified in the OpAync_1553_Ctrl block. This may indicate a missing, disabled or defective remote terminal or a bus failure.
-20	The received packet contains more data words than the width of the Data output. In this case, the exceeding data words are discarded but Word Count still reports the actual message length.

Status: This output reports one of the following values:

Value	Description
0	No new packets have been received.
1	The asynchronous process is processing the reception.
2	A new packet has been received and the Data and Word Count outputs have been updated. If the remote terminal failed to reply, this output is still set to 2 but the Error output flags the error

Data: this output returns the data received. The number of signals must be equal to the number of data words per message plus2. The last 2 signals at the end of the data line are used to contain the status response words associated with the operation's chain link.

All operations, except RTRT, will produce only one status word contained in the second to last output. RTRT operations produce a second word contained in the last signal. The content of the status words is described in the following table:

Bits	Description
0	Terminal flag bit
1	Bus control accept
2	Subsystem flag
3	Busy
4	Broadcast command received
5, 6 and 7	Reserved
8	Service request
9	Instrumentation
10	Message error
11 to 15	RT address

Word Count: Actual word count of the received response.

Characteristics and Limitations

This block has no special characteristics.

Direct Feedthrough	No
Discrete sample time	No
XHP support	No
Work offline	No

RT-LAB Documentation

OpAsync 1553 BC Receive block