2 inputs, 3 chart recorder – INFICON XTM/2 Thin Film Deposition Monitor User Manual
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XTM/2 Operating Manual
3.7.2 Inputs
Inputs are activated by pulling the specific input's terminal to ground (<0.8V)
through a contact closure to common (GND) or with TTL/CMOS logic having
current sink capability of 2 ma (1 low power TTL load). These ports are read
every 250 ms; signals must be present during a read cycle.
3.7.3 Chart Recorder
The chart recorder output has 12 bit resolution with one additional bit of sign
information over the range of -10 to +10 volts. It can supply up to 5 milliamps
and has an internal resistance of 100 ohms. The output is proportional to rate,
thickness or rate deviation depending on the setting of the configuration
switches; see
. It is normal for ripple to appear on
these outputs to a maximum of 5 mV at ~84 Hz. This output is updated every
250 milliseconds.
Table 3-4 System I/O Connector
Pin #
Function
Description
Input #
14,15,16,17
Input Common (GND)
Used as reference for activating
any of the inputs
18
OPEN
Detection of a falling edge
duplicates front panel OPEN
1
19
CLOSE
Detection of a falling edge
duplicates front panel CLOSE
2
9
CRYSTAL FAIL
INHIBIT
Presence of a closure to ground
reference prohibits the closure
of the Crystal Fail Relay.
3
20
ZERO thickness
Detection of a falling edge
duplicates the front panel
ZERO, for thickness only.
4
21
ZERO timer
Detection of a falling edge
duplicates the front panel ZERO
for the timer only.
5