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5. Output Type:
The ITC-79-FTF has three standard output types.
and 24 VDC.
default setting).
inserted.
All outputs can be used simultaneously.
The 24 VDC output is a 'straight through' output which means that it follows the
incoming signal directly (i.e. when the input goes high the 24 VDC output goes high,
etc.).
The TTL output is inverted ! (i.e. when the input goes high, the TTL output
goes low and vice versa).
6. Additional Setup & Calibration for ITC-79-FTF-BUF only:
The ITC-79-FTF-BUF stores incoming pulses (frequency) in an internal buffer in its
microprocessor and releases them at a slower rate as a 50% duty cycle square wave.
The output pulse release rate is adjustable from immediate output (no buffering) to
6.5 second pulse durations in 0.1 msec intervals.
using the jumper strip H1.
up to 65536 (2
1 is equivalent to 0.1 msec, position H1-2 equals 0.2 msec, H1-3 equals 0.4 msec all
the way to H2-16 which equals 3276.8 msec (3.2768 sec.).
Example: for an output pulse rate of 1/2 second (500 msec.) the jumpers on H1 have
to be as follows.
H1-1
H1-2
H1-3
H1-4
The jumpers that are inserted carry the binary weights of
which when added together, results in 500.0 msec
Output Selection:
The ITC-79-FTF-BUF can be configured as a 'straight through' instrument or a pulse
buffer or a combination of both.
jumpers H4-4,5 control the TTL output.
jumpers affect the operation of the outputs:
H4-1
input directly
H4-2
buffer
H4-3
To activate the TTL output, jumper H4-4 must be inserted (factory
To activate the relay
The release time is encoded in binary which means that
16
) combinations of release rates are selectable.
out
H1-5
out
H1-6
out
H1-7
out
H1-8
Relay
Relay & 24 VDC follow input directly
Relay & 24 VDC driven by buffer
Relay & 24 VDC is same as TTL output
(depending on H4-4,5)
and 24 VDC output, jumper H4-1 must be
out
H1-9
out
H1-10 in
out
H1-11 out
in
H1-12 out
Jumpers H4-1,2,3 control the relay output and
The following tables show how the different
These are Dry Contact, TTL (5V),
The pulse release rate is set up
Jumper position H1-
in
H1-13 in
H1-14 out
H1-15 out
H1-16 out
0.8+12.8+25.6+51.2+409.6
TTL Output
H4-4
H4-5
TTL
TTL Output follow
Output
driven
by
Dwg. 105133 Page 3
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