379
Table 12-31 FLEX DECODER PACKET SEQUENCE
PACKET
PACKET
TYPE
PHASE
WORD
NUMBER
COMMENT
1st
ADDRESS
A
N.A. (7)
Address 1 has a vector located at WN 7
2nd
ADDRESS
A
N.A. (8)
Address 2 has a vector located at WN 8
3rd
VECTOR
A
7
Vector for Address 1: Message Words
located at WN = 9 to 11, phase A
4th
BIW
C
N.A.
If BIWs enabled, then BIW packet sent
5th
BIW
C
N.A.
If BIWs enabled, then BIW packet sent
6th
LONG
ADDRESS
C
N.A. (10)
Long Address 3 has a vector beginning in
word 10 of phase C
7th
VECTOR
A
8
Vector for Address 2: Message Words
located at WN = 12 to 15, phase A
8th
MESSAGE
A
9
Message information for Address 1
9th
MESSAGE
A
10
Message information for Address 1
10th
MESSAGE
A
11
Message information for Address 1
11th
MESSAGE
A
12
Message information for Address 2
12th
MESSAGE
A
13
Message information for Address 2
13th
MESSAGE
A
14
Message information for Address 2
14th
MESSAGE
A
15
Message information for Address 2
15th
VECTOR
C
10
Vector for Long Address 3: Message
Words located at WN = 14 - 15, phase C
16th
MESSAGE
C
11
Second word of Long Vector is first
message information word of Address 3
17th
MESSAGE
C
14
Message information for Address 3
18th
MESSAGE
C
15
Message information for Address 3
The first message is built by relating packets 1, 3, and 8-10. The second message is built by
relating packets 2, 7 and 11 - 14. The third message is built by relating packets 6 and 15 - 18.
Additionally, the host may process block information in packets 4 and 5 for time setting
information.
12.5.3
Building a Fragmented Message
The longest message which will fit into a frame is 84 code words total of message data. Three
alpha characters per word yields a maximum message of 252 characters in a frame assuming no
other traffic. Messages longer than this value must be sent as several fragments.