LEYBOLD 157 89, Руководство пользователя

Страница: 27 / 40

3.3.1.5 Reset character
With the character <ESC> (Escape; ASCII code: 27
d
)
without <CR> the interface of the A-series instrument
may be reset to a defined state. A character string which
is possibly still being processed is erased and proces-
sing of the command is terminated.
After receiving the <ESC> character this is acknowled-
ged by <ACK> <CR>, after which the interface will be
ready to receive again.
3.3.2 Printer operation
3.3.2.1 Output of measurement data to a printer
After start-up the A-series instrument will transmit all
measurement data or the corresponding sensor status
information automatically every 10 s.
A cable link according to Section 2.2 is required for the
connection between the A-series instrument and a prin-
ter. The printer must have a RS 232 C interface which
can be set up for the parameters required by the A-series
instrument.
The A-Series instruments requires at least 2 lines:
- Transmission data
TxD Pin 2 Opposite side
Receive data:
- Signal ground GND Pin 5 Opposite side:
Signal ground
3.3.2.2 RS 232 C baud rate and data
format for printer output
Baud rate and data format are fixed (see Sections 3.2.1
and 3.2.2).
3.3.2.3 Output rate for printer output
The measurement data are output to a printer, for exam-
ple, at a fixed interval (see Section 3.2.4).
3.3.2.4 End character
In the printer mode the character string <CR> <LF>
(carriage return and line feed) is used as the end charac-
ter (see Section 3.3.1.3).
3.4 Data output and data
formats
3.4.1 Measurement data output
2.4.1.1 Remote control operation
The A-series instrument will transmit the measurement
data after being requested to do so through the com-
mand „MES R measurement channel“
R Read (optional)
Measurement channel TM1, TM2, PM
Output in the following format, provided measure-
ment operation is possible:
Measurement channel:Unit:-n.nnE-mm<CR>
Meaning:
Measurement
channel
TM1, TM2, PM 3 characters
:Unit mbar, Torr, Pa, Micron 7 characters
:-n.nn Mantissa possibly with sign 6 characters
E-mm Exponent always with sign 4 characters
<CR> End character 1 character
Thus the entire length of a string for one set of measu-
rement data is 21 characters.
Example TM1:MBAR :7.61E-01<CR>
Output when no measurements are possible
Status format:
Measurement channel:ErrorNo.:Errortext<CR>
Meaning:
Measurement channel TM1, TM2, PM
Error no. Error text Description
————————————————————————
0 OFF HV off
(PM channel only)
1 FILBR Filament broken
(for TM channel and DM chan-
nel with series 300 THERMO-
VAC sensor)
2 Not used
3 NOSEN No sensor connected
(for TM and DM channel)
4 FAIL Sensor failure for DM channel
or general unspecified fault
The length of the character string for the sensor status is
also 21 characters.
Example TM1:3 :NOSEN<CR>
3.4.1.2 Printer output
In the „Print only“ mode the measurement data are out-
put to the printer in the following format:
27