Serial bus analysis
R&S
®
RTM3000
322User Manual 1335.9090.02 ─ 09
Data Word
Figure 13-42: Structure of a data word
The format of a data word consists of the following parts (see Figure 13-42):
●
Sync: an invalid Manchester waveform.
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Data: the transferred information (16 bit).
●
Parity: checks if there are bit errors during the transmission. The total number of
logic 1 bits for the word (sync bits not included) shall be odd.
Status Word
Figure 13-43: Structure of a status word
The format of a status word consists of the following parts (see
Figure 13-43):
●
Sync: an invalid Manchester waveform.
●
Remote Terminal (RT) Address: the unique address of the corresponding RT.
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Message error: indicates an error in the command/data word transmission from the
BC. A logic 1 indicates presence of a message error and a logic 0 indicates its
absence.
●
Instrumentation: helps to distinguish between a status word and a command word.
The logic state of this bit shall be 0.
●
Service Request: indicates that the RT requires service. A logic 1 indicates a pres-
ence of a service request and logic 0 indicates its absence.
●
Reserved: bits reserved for future uses.
●
Broadcast Command: a logic 1 indicates that the preceding valid command word
was a broadcast command and a logic 0 that it was not.
MIL-STD-1553 (option R&S
RTM-K6)
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