Edwards STP-iX455 User Manual

STP-iX455/iXL455 Series Instruction Manual
9-14
Operation
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).
9.3.9 Control Command in the RS485 Multi-point Connection
The control command to be used when a pump operation instruction or a setting change
instruction is transmitted to the SIM is arranged in the order specified below: The top is
"Sp" (space character, HEX code"20") and ASCII characters corresponding to the
respective function code and parameter follow.
Sp CHR C
1
C
2
C
n
CHR: Function code character, C
1
to C
n
: Parameter
Parameter (from C
1
to C
n
) serves as 16 bits signed hexadecimal value coded ASCII text.
When a message (a space character, a function code, and parameter) exceeds 255
characters, input "Sp" and CHR only to the top transmission block (the first
transmission block of the transmission frame). It is not necessary to input them to the
2nd and succeeding transmission blocks.
The SIM returns the acknowledgment response character "#" when the control
command is processed normally. If not, the SIM returns the non-acknowledgment
response character "!" and 3 characters of the non-acknowledgment code are added to
"!".
Transmission frame when data is transmitted to one block (a message is less than 256
characters):
Designate the control command on the PC.
←Less than 256 chr.→
PC→SIM
@ F
1
F
2
Stx 0 0 1 Sp CHR C
1
C
n
Etx LRC
SIM→PC
Ack or Nak F
1
F
2
Always assign less than 254 characters (n< 254) to the parameter so that the message is
less than 256 characters.
Next, the preceding SIM->PC character is "Ack", the instructed control command is
executed and the SIM returns the following response.
PC→SIM
Ack or Nak F
1
F
2
SIM→PC
@ F
1
F
2
Stx 0 0 1 # or ! Etx LRC
The PC transmits "Ack" or "Nak"; then transmits the next command if necessary.

Edwards STP-iX455 Specifications

General

Type	Turbo Molecular Pump
Category	Water Pump
Outlet Port	DN 25 ISO-KF
Frequency	50/60 Hz
Pumping Speed	455 L/s
Operating Temperature Range	5°C to 40°C