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of
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Figure 4
. Terranova® 907 RS-232 pin configuration
The Terranova® 907 outputs pressure values in the following scientific notation format
AeB, XeY
in which
A
and
X
are the significand and
B
and
Y
are the exponent. When character p is
transmitted to the unit,
A
and
B
values correspond to the convection-enhanced Pirani gauge
and
X
and
Y
values correspond to the capacitance diaphragm gauge. The control unit also
utilizes the same format to output set point pressure values. However, two values are
appended to the output
AeB, XeY, R, G
in which
R
indicates the set point relay state and
G
indicates the pressure gauge to which the
set point applies. If the relay is active,
R
= 1; otherwise,
R
= 0.
G
= CDG corresponds to the
capacitance diaphragm gauge;
G
= PIR corresponds to the convection-enhanced Pirani gauge.
When character 1 or 2 is transmitted to the control unit, pressure values correspond to
SET POINT HI and SET POINT LO, respectively.
Character
Query
Output format
Notes
1
SET POINT 1 values
AeB, XeY, R, G
ASCII value 49
2
SET POINT 2 values
AeB, XeY, R, G
ASCII value 50
f
Full-scale range
AeB
ASCII value 102
p
Pressure reading
AeB, XeY
ASCII value 112
u
Pressure units
Torr / mBar / Pascal
ASCII value 117
v
Model number;
Software version
907[J], ver N.NN
ASCII value 118
x
Gauge curve
275, CEP
ASCII value 120
Table 2
. Serial communication query characters
Pressure output is in the selected units of the UNITS & GAS parameter
