IO672 RT Initialize / IO672 / MIL-STD-1553 / Communication Protocols / Speedgoat I/O Blockset

Library

Simulink Real-Time - Speedgoat

Description

Add an RT Initialize block for each Remote Terminal address for which you want this board to accept commands. Because each of these blocks must execute after the global board initialization, connect the Init Struct input to either the:

Main IO672 Initialize block for this board
Another IO672 RT Initialize block that is connected to the main IO672 Initialize block

Ports

Inputs

Init Struct: Vector that contains information for RT Initialize block.

Outputs

Init Struct: Vector that contains information for RT Initialize block (Information passed through from input).

Parameters

Remote Terminal

From the list, choose a Remote Terminal from 0 to 31. The remote terminal number configured in RT Send and RT Receive must match that specified by the corresponding RT Initialize block.

Connect to bus A

Select this check box to have this Remote Terminal listen on bus A. If a message can come in on either bus, choose both A and B.

Connect to bus B

Select this check box to have this Remote Terminal listen on bus B. If a message can come in on either bus, choose both A and B.

Initial status

The value to which the board should initialize the status before it executes commands. The board maintains a status word that it sends to the Bus Controller after it executes a command.

Initial BIT word

The initial value of the Built In Test (BIT) word. The Remote Terminal sends this word in response to the Transmit BIT Word mode code.

Inhibit terminal flag

Selecting this check box inhibits the Remote Terminal flag. This value is the initial value of the Inhibit Terminal Flag bit. This value can be changed from the Bus Controller with the Inhibit Terminal and Override Inhibit Terminal mode codes. The terminal bit is one of the bits in the status word that is maintained by the I/O module.

Transmit sub addresses

A vector of sub addresses to which this Remote Terminal must respond. These sub addresses are the sub addresses that can transmit data when requested. Each element of the vector must correspond to the corresponding element of the Legal transmit message lengths vector. To enable the sub address for the Remote Terminal, include the sub address in the vector. A Remote Terminal accepts a message only if it has been directed to accept messages of the same length. During initialization, the board must receive a list of valid message lengths for each Remote Terminal number.

Legal transmit message lengths

A vector of transmit message lengths. This vector is a vector of bit masks. Each mask bit corresponds to a single message length. Construct the transmit message length vector as follows:

Each element of the vector corresponds to the corresponding element of the Transmit sub addresses vector.
Each element of the vector corresponds to the corresponding element of the Legal receive message lengths. Failure to do so prevents the sub address on this Remote Terminal from responding.

A message can have a length of from 1 to 32 words, selected by setting one or more bits in a 32-bit mask.

Bit Position	Mask Value (hex)	Word Length (words)
0	0x00000001	32
1	0x00000002	1
2	0x00000004	2
...	...	...
30	0x40000000	30
31	0x80000000	31

Use the hex2dec function to specify the bit mask in hexadecimal.
The message length is expressed by bit position in the mask, not by mask value. The value 0xffffffff enables all message lengths from 1 to 32.
The board does not accept a message with a disallowed length. The board sends an error to the Bus Controller by returning a status with the Message Error bit set.

Receive sub addresses

A vector of the sub addresses that can accept a receive message. Each element of the vector must correspond to the corresponding element of the Legal receive message lengths vector. To enable the sub address for the Remote Terminal, include the sub address in the vector. A Remote Terminal accepts a message only if it has been directed to accept messages of the same length. During initialization, the board must receive a list of valid message lengths for each Remote Terminal number.

Legal receive message lengths

A vector of receive message lengths. This vector is a vector of bit masks. Each mask bit corresponds to a single message length. Construct the receive message length vector as follows:

Each element of the vector corresponds to the corresponding element of the Transmit sub addresses vector.
Each element of the vector corresponds to the corresponding element of the Receive sub addresses vector.
Each element of the vector corresponds to the corresponding element of the Legal receive message lengths. Failure to do so prevents the sub address on this Remote Terminal from responding.

A message can have a length of from 1 to 32 words, selected by setting one or more bits in a 32-bit mask.

Bit Position	Mask Value (hex)	Word Length (words)
0	0x00000001	32
1	0x00000002	1
2	0x00000004	2
...	...	...
30	0x40000000	30
31	0x80000000	31

Use the hex2dec function to specify the bit mask in hexadecimal.
The message length is expressed by bit position in the mask, not by mask value. The value 0xffffffff enables all message lengths from 1 to 32.
The board does not accept a message with a disallowed length. The board sends an error to the Bus Controller by returning a status with the Message Error bit set.

Sample Time

Defines the base sample time at which this driver block gets its sample hit. This parameter can also be set to -1 for inherited sample time. The units are in seconds.

Enable input bus A

Select this check box to control bus A through an input port.

Enable input bus B

Select this check box to control bus B through an input port.

Documentation