VACUUBRAND PC 620 NT - Manual (Page 36)

page 36 of 63
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999188 / 19/05/2009
The controller CVC 3000 is equipped with a serial interface (RS 232C, nine-pole Sub-D-plug).
☞
Plug-in or remove the cable (cable RS 232C) from the interface only if the equipment is switched off.
☞ The interface is not electrically isolated from the measuring circuit.
☞ For optimal electromagnetic compatibility assemble an interface filter (cat. no.: 638235).
The controller is fully operable via the serial interface. Measuring results, preselections and the status of
the controller can be read at any time.
Factory-set the read and write commands are completely compatible to the VACUUBRAND con-
troller CVC 2000 (see section read and write commands ”CVC 2000”). An extended instruction set
is available using the command ”CVC 3” (see section read and write commands ”CVC 3000”).
Setting of the interface
Set the interface parameters directly at the controller CVC 3000. The factory set values are underlined.
Edit and confirm the interface parameters in the function ”Configuration” in the menu ”RS-232” using the
selection knob.
➨ Baud: 2400, 4800, 9600 or 19200
➨ Parity: 8-N-1, 7-O-1 or 7-E-1
➨ Handshake: Off, Xon-Xoff or RTS-CTS
➨ Remote: On or Off
➨ Timeout: Sending 1s, receiving 10s.
In remote mode (Remote On, ”PC symbol” in the display) all keys at the controller are without function.
To return to the manual operation of the controller set the controller to ”Remote off” in menu
configuration. Therefore switch off the controller. Switch on the controller and press the selec-
tion knob within 2s.
➨
Maximum ten commands per second are possible.
➨ Read commands and commands ”REMOTE”, ”CVC” and ”STORE” can be sent always. The sending
of other write commands is only possible, if ”Remote on” is selected.
➨ The commands have to be written in capital letters.
➨ Command and parameter have to be separated by a blank.
➨ The string is terminated with <CR> or <CR><LF>.
➨ The return of the controller is always terminated with <CR><LF>.
➨ Numerical values and parameters can be written without leading zeros.
➨ The return of the controller is always with leading zeros.
DKD calibration controller CVC 3000 ..........................................................................................900217
Control of measuring equipment
The VACUUBRAND DKD calibration laboratory is accredited by the Physikalisch-Technische Bun-
desanstalt (PTB; German national institute for science and technology and the highest technical author-
ity of the Federal Republic of Germany for the field of meteorology and certain sectors of safety engi-
neering) for the measurable variable pressure in the pressure range from 10 -3 mbar to 1000 mbar in
accordance with the general criteria for the operation of testing laboratories defined in the DIN EN ISO/
IEC 17025:2000 series of standards.
Calibration in the VACUUBRAND calibration laboratory:
- To meet the requirements of the DIN ISO 9000ff and 10012 series of standards regarding the calibra-
tion of inspection, measuring and test equipment at specified intervals.
- To document that the vacuum gauges calibrated are traceable to national standards of the PTB.
Calibration in the factory
Interface parameters