STP-iXA4507 series Turbomolecular Pump
SERIAL COMMUNICATION PROTOCOL
Next, when the preceding SIM->PC character is "Ack", the PC continues instructing the following
control command (the 2nd block).
The parameter characters are less than 510 characters (n< 510) when a 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.
The PC transmits "Ack" or "Nak", then transmits the next command if necessary.
5.3.10 Query command in RS485 multi-point connection
The control command to a SIM for a pump operation or a setting change transmitted is specified
below. The first character is "?" (HEX code "3F"). And the next ASCII characters correspond to the
function code and parameter.
CHR: Function code character, C
1
to C
n
: Parameter.
The parameter (C1 to Cn) is 16 bit signed hexadecimal value coded ASCII text. When a message
(the space character, the function code, and the parameter) exceeds 255 characters, input "?" and
CHR to only the top transmission block (the first transmission block of the transmission frame). It is
unnecessary to input them into the second and succeeding transmission blocks.
The SIM returns the acknowledgement response character "#" when the query command is
processed correctly. If not, the SIM returns the non-acknowledgement response character "!" and 3
characters of the non-acknowledgement code are added to "!".
Transmission frame when data is transmitted with one block and returned with two blocks:
Designate the query command on a PC first.
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