Installation
Micro-Ion
®
Module Instruction Manual - 356007-GP
19
In
stallation
O
per
a
tion
Maintenance
Before You
Begin
(a) 15K pull-up to 12 Vdc, (LOW) 0 Vdc at 0.80 mA. See Figure 2-4.
(b) Open Collector, no pull-up, 40 Vdc, 50 mA. See Figure 2-4.
(c) Pin must be held LOW for at least 2 msec to activate calibration.
Table 2-2
Connections to 15-pin Subminiature D Connector
Pin #
Function
Input or Output
Description
Pin 1
Micro-Ion gauge
ON/OFF
Input
Must be continuously connected to Pin 5 (LOW) to turn gauge ON
(a)
• Removing ground connection turns gauge OFF
Pin 2
Analog output
Output
• 0.5 Vdc/decade, 7 Vdc maximum
• Ground reference to pin 12
Pin 3
Filament status
Output
(LOW) Indicates an inoperable filament
(b)
Pin 4
Gauge status
Output
(LOW) Indicates Micro-Ion gauge is ON
(b)
Pin 5
Ground (–)
Input
Power supply ground
Pin 6
Degas status
Output
(LOW) Indicates Micro-Ion gauge degas is ON
(b)
Pin 7
Degas ON/OFF
Input
• Continuous LOW will activate 2-minute degas
(a)
• Pressure must be < 5 x 10
–6
Torr (6.66 x 10
–6
mbar,
6.66 x 10
–4
pascal) for degas to start
Pin 8
+24 Vdc power
Input
+20.4 Vdc to +27.6 Vdc, 26 W nominal
Pin 9
Calibration
Input
LOW sets atmospheric or vacuum calibration point
(a) (c)
Pin 10
Not used
Not used
Pin 11
Keyboard lock
Input
Continuous LOW locks keyboard
(a)
Pin 12
Signal common
Output
Signal ground (analog output)
Pin 13
RS-485+
Input/output
RS-485+
Pin 14
RS-485 –
Input/output
RS-485 –
Pin 15
Chassis ground
Input
Chassis ground (cable shield)
Summary of Contents for 356 Micro-Ion Plus Series
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