SYNC
CMD
*
The device will respond with status. The NSYNC signal will go
active low for 500 nS. Throughout this period the highway T0-
T15 will be zero and remain at zero until the next command is
received.
f the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
Error Conditions
STATUS
TX ST
CMD
*
he status register is not cleared or loaded before it is transmitted,
i.e. it contains the resulting status from the previous command.
Error Conditions
STATUS
I.S.T
CMD
*
The device will respond with status..
f the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
STATUS
TX DIS
CMD
*
he device will respond with status and shutdown the transmitter
on the alternate bus, thus inhibiting any further transmission on that
bus.
nce a transmitter has been shutdown it can only be reactivated by
the mode commands 'Override Transmitter Shutdown' or 'Reset
Remote Terminal'.
the command was a broadcast the status transmission will be
suppressed and the broadcast bit in the status register set.
STATUS
11
SCDCT2578 REV B 3/11/98
SYNCHRONIZE WITHOUT DATA WORD (01)
INITIATE SELF TEST (03)
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
to zero.
No status response.
Set message error.
Sequence terminated
4. T/R bit of command set
to zero and broadcast
address
No status response.
Set message error.
Set broadcast.
Sequence terminated.
TRANSMIT STATUS (02)
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
to zero.
No status response.
Set message error.
Sequence terminated
4. Broadcast address.
No status response.
Set message error.
Set broadcast.
Sequence terminated.
5. T/R bit of command set
to zero and broadcast
address
No status response.
Set message error.
Set broadcast.
Sequence terminated.
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
to zero.
No status response.
Set message error.
Sequence terminated
4. T/R bit of command set
to zero and broadcast
address
No status response.
Set message error.
Set broadcast.
TRANSMITTER SHUTDOWN (04)
Error Conditions
Action taken by device
1. Invalid command.
No response.
Command ignored.
2. Command followed by
another word.
No status response.
Set message error.
Sequence terminated.
3. T/R bit of command set
to zero.
No status response.
Set message error.
Sequence terminated
4. T/R bit of command set
to zero and broadcast
address
No status response.
Set message error.
Set broadcast.
Sequence terminated.