STP-iXR1606 Turbomolecular Pump
MT-79E-001-D
Page 82
5
SERIAL COMMUNICATION PROTOCOL
Then 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
SIM->PC Stx 0 0 1 # or ! Etx LRC
The PC transmits "Ack" or "Nak"; then transmits the next command if necessary.
Transmission frame when data is transmitted to two blocks (message is more than 256 characters
and less than 512 characters):
Designate the control command (the 1st block) on the PC
PC->SIM Stx 0 0 1 Sp CHR C
C
Etb LRC
SIM->PC Ack or Nak
Next, the preceding SIM->PC character is "Ack", the PC continues instructing the control command
(the 2nd block).
PC->SIM Stx 0 0 2 C
C
Etx LRC
SIM->PC Ack or Nak
Always assign less than 510 characters (n< 510) to the parameter so that the message is less than
512 characters.
Then 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
SIM->PC Stx 0 0 1 # or ! Etx LRC
The PC transmits "Ack" or "Nak"; then transmits the next command if necessary.
5.3.4 Query command (in the RS232/RS485 single point connection)
A query command is used to read the pump operation state and setting values. The first character of
the query command in the RS232/RS485 single point connection is "?"(HEX code "3F"), and
succeeding characters are ASCII characters corresponding to the respective function code and
parameter.
? CHR C
C
C
CHR: Function code character, C
1
to C
n
: Parameter
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