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262
UF-7000/8000
APR 2007
Ver. 2.1
UF-7100/8100
A computer in the ring captures the token, if it has data to transmit, it holds the token and transmits a data
frame. This data frame is passed to each computer in the ring, which checks whether it is the intended
recipient of the frame.
When the frame reaches the destination address, the destination PC copies the frame to a receive buffer,
updates the frame status field of the data frame and puts the frame back on the ring. When the computer
that originally sent the frame receives it back from the ring, it acknowledges a successful transmission,
takes the frame off the ring, and places the token back on the ring.
Token Frame indicates that the network is available for transmission.
Data Frame indicates that the network is busy processing a transmission.
Token Frame Format
Data Frame Format
There are several different bit types assigned for Frame Status. For example, 1 and 5 bit indicates that the
token has been read, 2 and 6 bit indicates that the frame has been copied by another station. Thus, we can
confirm whether the Data Frame was delivered.
Most significant bit
Start De-limiter (SFD)
1 byte
P P P S M R R R
End De-limiter (ED)
1 byte
P: priority
S: Status
0 = Token Frame
1 = Data Frame
R: Reserved
Least significant bit
Most significant bit
SFD
1 byte
Access
Control
1 byte
Frame
control
1 byte
Destination
MAC
6 or 2 byte
Source
MAC
6 or 2 byte
Data
FCS
4 byte
ED
1 byte
Frame
Status
1 byte
Data: Max 4429 byte (4M)
Max 17779 (16M)
Least significant bit
Summary of Contents for Panafax UF-7000
Page 9: ...Table of Contents 9 Schematic Diagram 303 10 1 General Circuit Diagram 303 ...
Page 122: ...122 UF 7000 8000 APR 2007 Ver 2 1 UF 7100 8100 Sensor and Switch Location ...
Page 304: ...304 APR 2007 Ver 2 1 UF 7000 8000 UF 7100 8100 memo ...
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