Edwards STP-iS2207 Series Instruction Manual page 93

Examples: Network frame ID character and number in the multi-point connection
ASCII @ 0 1
HEX 40 30 31
ASCII @ 6 4
HEX 40 36 34
ASCII @ 7 F
HEX 40 37 46
The transmission frame has a single block or multiple transmission blocks. Each transmission block
consists of a network frame ID character, a network frame number, a start control character, data
block number (3 digits), a message (up to 255 characters), an end control character and a checksum
(LRC). The following shows the transmission frame when the message transmission character string
is C .
n
Transmission frame when a message is below 255 characters (n<=255):
1 2 3
@ F F Stx
ASCII
1 2
"@" is used as a network frame ID character.
"Stx" and "Etx" are used as a start and an end character of the transmission frame, respectively.
Transmission frame when a message exceeds 255 characters (n = 255, m<=255, k = the number of
transmission blocks)
First 1
Block ASCII @
Second 1
Block ASCII @
Final 1
Block ASCII @
"@" is used as a network frame ID character.
"Stx" is a start character of each transmission block, and "Etb" is an end character of the transmission
block of a message of 255 characters.
"Etx" is used as an end character of the final transmission block (end character of the transmission
frame).
STP-iS2207 Series Turbomolecular Pump
Network frame No "1"
Network frame No "100"
Network frame No "127"
4 5 6 7 8
0 0 1 C
1
2 3 4 5 6
F F Stx 0 0
1 2
2 3 4 5 6
F F Stx 0 0
1 2
2 3 4 5 6
F F Stx k
1 2
8+n 8+n+1 8+n+2
C Etx LRC
n
7 8 8+n
1 C1 C1
1 n
7 8 8+n
2 C2 C2
1 n
7 8 8+m
Ck Ck
1 m
8+n+1 8+n+2
Etb LRC
8+n+1 8+n+2
Etb LRC
8+m+1 8+m+2
Etx LRC
MT-89E-001-C
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