Building A Fragmented Message - Hitachi H8/3937 Series Hardware Manual

Table 12-31 FLEX DECODER PACKET SEQUENCE
PACKET
PACKET TYPE
1st ADDRESS
2nd ADDRESS
3rd VECTOR
4th BIW
5th BIW
6th LONG
ADDRESS
7th VECTOR
8th MESSAGE
9th MESSAGE
10th MESSAGE
11th MESSAGE
12th MESSAGE
13th MESSAGE
14th MESSAGE
15th VECTOR
16th MESSAGE
17th MESSAGE
18th MESSAGE
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.
WORD
PHASE NUMBER
A N.A. (7)
A N.A. (8)
A 7
C N.A.
C N.A.
C N.A. (10)
A 8
A 9
A 10
A 11
A 12
A 13
A 14
A 15
C 10
C 11
C 14
C 15
COMMENT
Address 1 has a vector located at WN 7
Address 2 has a vector located at WN 8
Vector for Address 1: Message Words
located at WN = 9 to 11, phase A
If BIWs enabled, then BIW packet sent
If BIWs enabled, then BIW packet sent
Long Address 3 has a vector beginning in
word 10 of phase C
Vector for Address 2: Message Words
located at WN = 12 to 15, phase A
Message information for Address 1
Message information for Address 1
Message information for Address 1
Message information for Address 2
Message information for Address 2
Message information for Address 2
Message information for Address 2
Vector for Long Address 3: Message
Words located at WN = 14 - 15, phase C
Second word of Long Vector is first
message information word of Address 3
Message information for Address 3
Message information for Address 3
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