MKS Granville-Phillips 358 series, Instruction Manual

Page: 68 / 122

Chapter 5
68
Series 358 Micro-Ion Controller Instruction Manual - 358013 - Rev. B
5.2 Alternate ON/OFF Gauge
Control
The Micro-Ion Gauge can be turned ON and OFF in the following ways:
• Use the front panel Micro-Ion Gauge “momentary” GAUGE ON/OFF
switch. See Figure 5-2.
• Automatically via the Auto ON function of the Convectron gauge
module. See Filament Auto ON on page 80.
• Use the RS-232 or RS-485 Computer Interface modules. See Command
Syntax for RS-232 Computer Interface on page 88 or Command Syntax
for RS-485 Computer Interface on page 91.
• The ON/OFF toggle from the Remote Input/Output Connector. See
Micro-Ion Gauge Remote Input/Output on page 68.
In addition, the Micro-Ion Gauge will be automatically turned OFF by
excessive pressure.
Figure 5-2 Micro-Ion Gauge Momentary ON/OFF Switch
5.3 Micro-Ion Gauge Remote
Input/Output
Two TTL compatible inputs are provided through the rear panel allowing
control of the Micro-Ion gauge and degas. The function of the front panel
keys is reproduced by either a contact closure or an asserted low (0V) logic
state on these inputs. This low state must be held continuously at
<0.4V@10µA (LOW) for at least 25 milliseconds. After this, the input must
be allowed to pull high to >3.5V(HIGH) for at least 105 milliseconds before
another low will be accepted. These inputs have passive pull-ups to +5 V
internal supply.
A single-pole, double-throw relay is provided to indicate Micro-Ion gauge
status (normally open contact is open when the Micro-Ion gauge is OFF).