Rs 232 Communication Descriptions - Varian Turbo-V 150 Notice De Mode D'emploi

RS 232 Communication Descriptions

Communication format:
•
8 data bit
•
no parity
•
1 stop bit
•
The baud rate is programmable via front panel from
600 to 9600 baud. The controller is factory-set for
9600 baud operation.
When a baud rate of 2400, 4800, 9600 baud is used,
the requested information from Host to controller must
be sent with a minimum interval of 1 second to avoid
the controller hang-up.
Communication protocol:
Host = Master
Controller = Slave
The communication is performed in the following way:
Communication RS 232 serial port connections
Minimum connection configuration
Request is an ASCII character identifying the action that
must be performed by the controller or the requested
information.
NOTE
Allowed ASCII characters:
•
"A" = START
•
"B" = STOP
•
"C" = Low Speed ON
•
"D" = Low Speed OFF
•
"E" = Request for operational parameters
•
"F" = Pump times zeroing
•
"G" = Parameters reading
•
"H" = Parameters writing
•
"I" = Request for operating status
•
"J" = Request for numerical reading
•
"K" = Request for counters reading.
CRC corresponds to the sum (with inverted sign) of all the
preceding bytes.
e.g., the START command "A" in ASCII
inverted it will be: FF + 1 - 41 = BF.
56
TECHNICAL INFORMATION
code = 41;
87-900-907-01 (B)