Edwards STP Series User Manual

STP-iXR1606 Turbomolecular Pump
MT-79E-001-D
Page 85
5
SERIAL COMMUNICATION PROTOCOL
Examples: Network frame ID character and number in the multi-point connection
ASCII @ 0 1 Network frame No "1"
HEX 40 30 31
ASCII @ 6 4 Network frame No "100"
HEX 40 36 34
ASCII @ 7 F Network frame No "127"
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 4 5 6 7 8 8+n 8+n+1 8+n+2
ASCII
@ F
1
F
2
Stx 0 0 1 C
1
C
n
Etx LRC
"@" 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 2 3 4 5 6 7 8 8+n 8+n+1 8+n+2
Block ASCII @ F
1
F
2
Stx 0 0 1 C1
1
C1
n
Etb LRC
Second 1 2 3 4 5 6 7 8 8+n 8+n+1 8+n+2
Block ASCII @ F
1
F
2
Stx 0 0 2 C2
1
C2
n
Etb LRC
Final 1 2 3 4 5 6 7 8 8+m 8+m+1 8+m+2
Block ASCII @ F
1
F
2
Stx k Ck
1
Ck
m
Etx LRC
"@" 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).

Edwards STP Series Specifications

General

Brand	Edwards
Model	STP Series
Category	Water Pump
Language	English