LEYBOLD 157 89, Manual

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Output in the following format, provided measure-
ment operation is possible:
Measurement channel:Unit:-n.nnE-mm<CR><LF>
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><LF> End character 2 characters
Thus the entire length of a string for one set of measu-
rement data and for single-channel instruments is 22
characters.
Example
TM1:MBAR:4.04E+00
TM2:MBAR:5.00E-04
PM:MBAR:1.00E-05<CR><LF>
Output when no measurements are possible
Status format:
Measurement channel:ErrorNo.:Errortext<CR><LF>
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
channel with series 300
THERMOVAC sensor)
2 Not used
3 NOSEN No sensor connected
(for TM and DM chan-
nel)
4 FAIL Sensor failure for DM
channel or general
unspecified fault
Example
TM1:3 :NOSEN TM2:1 :FILBR PM1:0:OFF<CR><LF>
3.4.2 Parameter output and response time
The format for the response to requests for parameters
is given in the list of programming commands in Section
3.5.
Parameter settings and requests for parameter and mea-
surement data require internal processing so that res-
ponse times up to 2 s max. are likely to occur.
When the A-series instrument is just processing a com-
mand or transmitting a string while further characters are
being transmitted to the instrument it will ignore these as
invalid.
3.5 Interface commands and
data input for A-series
instruments with RS 232
C interface
The interface commands are composed of the following
sections:
- Command
abbreviation 3 characters for example MES for
measurement value
(compulsory entry)
- Direction
character 1 character R=Read or
W=Write
(can be omitted when the command
only allows for writing or reading, res-
pectively)
- Measurement
channel 3 characters TM1, TM2, PM
- Separating
character 1 character <,>
(Comma; ASCII code: 44
d
)
- Parameter value As many characters as necessary;
possibly with further separating cha-
racters
Notes
Direction character:
W = Writing of parameters (write)
R = Reading of set parameters (read)
In the case of the programming commands for the instru-
ments of the A-series spaces may be added at will or left
out entirely.
All characters are accepted both in upper and lower
case.
3.5.1 Formation of measurement data and
readout commands
Selection of the
type of gas
GAS
Select type of gas GAS W measurement channel,
type of gas
Read type of gas GAS R measurement channel
Reply format: GAS measurement channel,
type of gas
Type of gas: N2 Nitrogen
Ar Argon
Display; measurement
channel assignment
DSP
Assignment of the
measurement channel
to the display
DSP W measurement
channel
Reading of the assigned
measurement channel
DSP R
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