11
Chapter 3
Interface Specification
3
4. Message
4-1.
Format
4-2.
Message Length
The first message byte.
This gives the total length (byte count) of the header and the message data.
4-3.
Header
See “4-6. Header” in this chapter.
4-4.
Message Data
See “4-7. Message Data” in this chapter.
4-5.
Checksum
A 2-byte block representing the sum of the binary numbers of the header and the message data without
codes.
The upper-digit byte is sent before the lower-digit byte.
4-6.
Header
4-6-1.
Format
Message length
1 byte
Header
10 bytes
Message data
max 244 bytes
Checksum
2 bytes
Messages consists of the following blocks.
Time
Upper device ID
Lower device ID
Upper message ID
Lower message ID
Upper block No.
Lower block No.
System byte
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
Device ID
Message ID
Block No.
System Byte
R
W
E
4-6-2.
Device ID
Used as an identification number for each device in an SECS network.
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