PROFIBUS INTERFACE
43
5
function of the OUT[0] byte:
OUT[0].bit0 = TxBufferEmpty, toggles when transmitted data block has been read
from master.
OUT[0].bit1 = RxBufferFull, toggles when new data block is available from master.
OUT[0].bit2 = Resync Request, set to 1 for 1 second to resynchronize a slave. After
resynchronization, all 4 handshake bits are set to 0 and next toggle brings them to 1.
OUT[0].bit3 = More Bit, it must be set to 1 when this is not the last piece of a
fragmentation sequence. It must be set to 0 when this is the last piece of a
fragmentation sequence.
OUT[0].bit4,5,7 = set to 0,0,0 when this messaging protocol is used.
OUT[0].bit6 = set to 1 when this messaging protocol is used.
The following figure shows how it is possible to exchange messages with flow control using
bit 0 and bit 1 in the IN/OUT buffers.
Figure 22: Message Exchange with Flow Control
Summary of Contents for GWY-01-PBS-01
Page 1: ...GWY 01 PBS 01 Reference Manual ...
Page 5: ...v C ASCII CHART 92 ...
Page 101: ...www automation datalogic com ...
