STP-iXA2205 Series Turbomolecular Pump
Nov. 10
104
Issue 1-h
5
SERIAL
COMMUNICATION
PROTOCOL
Next, the preceding SIM->PC character is "Ack", the PC continues instructing the control command
(the 2nd block).
PC->SIM @ F
1
F
2
Stx 0 0
2 C
254
C
n
Etx LRC
SIM->PC
Ack or Nak
F
1
F
2
Always assign less than 510 characters (n< 510) to the parameter so that the message is less than
512 characters.
Then the preceding PC->SIM 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.
5.3.10 Query command in the RS485 multi-point connection
The query command to be used when a pump operation instruction or a setting change instruction is
transmitted from the SIM and is arranged in the order specified below. The top is "?" (HEX code "3F")
and ASCII characters corresponding to the respective function code and parameter follow.
?
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 "?" and
CHR to the top transmission block only (the first transmission block of the transmission frame). It is not
necessary to input them to the second and succeeding transmission blocks.
The SIM returns the acknowledgment response character "#" when the query 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 from one block and returned to two blocks.
Designate a query command on the PC.
<- Less than 256 chr.->
PC->SIM @ F
1
F
2
Stx 0 0 1 ? CHR C
1
C
n
Etx LRC
SIM->PC
Ack or Nak
F
1
F
2
