Husky Hunter - Page 347

CCJ4MUNICATI0NS SECTION 6.7
6, 7, 5 MESSAGE TRANSMISSION
VEP., V09F
The following illustrate various message sequences and error
handling.
NOTE: TIC= Transmitting station, RX= Receiving station.
Fig 6. 1 NORMAL MESSAGE
ODD
EVEN
E
s
E s
E
TIC
N T (TEXT) T T
(TEXT) T
Q
X
B X B
RX A
A
C
C
K
K
0
1
Fig 6.2 UNANSWERED LINE BID {ERROR 01)
TX E (3 sec bid
N timeout)
Q
E (3 sec bid
N timeout)
Q
ODD
s
E
T (TEXT) T
X
A
C
K
0
E Number of
N retries
Q ---------
B
A
C
K
1
E
0
T
E
0
T
NOTE: HUNTER will retry for a total of 10 ENQs. Many mainframe
systems never give up,
Fig 6.3 ACCEPTED RE-TRANSMISSIONS
TIC
RX
E
N
Q
A
C
K
0
ODD
S E
T(TEXT-A)T
X B
N
A
K
ODD
S E
T(TEXT-A)T
X B
A
C
K
1
EVEN
S E
T(TEXT-B)T
X B
A
C
K
0
E
0
T
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