MIL-STD-1553

3.0 Definitions

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3.1 Responses

The following are definitions of the responses of the RT as used in this test plan. In each case the status word must have the correct terminal address and unused status bits set to zero.

3.1.1 Broadcast command received (BCR)

The broadcast command received bit (bit time fifteen) is set in status word (and no data words in response to a transmit status mode command or a single data word in response to a transmit last command mode command).

3.1.2 Busy bit (BUSY)

CS with the busy bit (ten time sixteen) set in the status word and no data words.

3.1 .3 Clear status (CS)

The status word may have the busy bit and/or service request bit set. All other status code bits in the status word must be zero and the associated message must have the proper word count.

3.1.4 Dynamic bus acceptance bit (DBA)

CS with the dynamic bus control acceptance bit (bit time eighteen) set in the status word.

3.1.5 Service request bit (SRB)

CS with the service request bit (bit time eleven) set in the status word.

3.1 .6 Message error bit (ME)

The message error bit (bit time nine) is set in the status word and no data words (except in response to a transmit last command mode command which requires on data word).

3.1.7 No response (NR)

The addressed terminal does not produce any response to the command.

3.1.8 Respond in form

A terminal is said to "respond in form" if its response to an illegal command is defined in the paragraph titled "Illegal command. of MIL-STD-1553 consists of a response formatted as though it were a legal command.

3.1.9 Subsystem flag bit (SF)

CS with the subsystem flag bit (bit time seventeen) set in the status word.

3.1.10 Terminal flag bit (TF)

CS with the terminal nag bit (bit time nineteen) set in the status word.