MTR 221 ACS - MTR 221 ACS DHHS
MANUALE ISTRUZIONI / INSTRUCTION MANUAL
O
PTIONAL
I
TEMS
140
Model R 221 ACS - R 221 ACS DHHS
MT
R
2
21
ACS
-
MTR
2
21
AC
S DHH
S - Optio
nal Ite
m
s
• Digital inputs are optoisolated to allow connection to devices that supply output control volt-
ages (typical range 12-32 V DC).
• Supply: 24V DC.
• Fuse: n.a. (not supplied by Ralco).
Digital and Analogue Inputs
Since the input signal sometimes comes from a voltage-free contact, the board features a
number of pins to which an external supply may be connected. As an alternative, these pins
may be connect to a voltage incoming from board ASR003 itself by simply connecting pin M79
to pin M80 and, pin M81 to pin M82.
The available voltage is not taken upstream of the voltage regulator but downstream of the fuse
and rectifier bridge.
The type of software applied determines the function of each input.
.
In this case the input range will be reduced with respect to the digitalization capacity of the
microprocessor digital/analogue convertor. However, the board will have better protection
against wrong Potentiometer connections.
The analogue inputs are designed primarily for connection to 1 Kohm potentiometers.
Additional safeguards have been added because the user could supply an analogue signal
directly without using potentiometers.
The main purpose of these inputs is to furnish the collimator with the cassette size data and
information related to focus-film/focus-floor distances (depending on the configuration).
In general, non linearity introduced by the safeguards is contained. However, should a greater
degree of precision be required (such as in the case of focus-film/focus-floor signals) we
suggest that a voltage between 0 and 6 V DC be supplied so as to make the most of the
convertor range.
Higher voltages up to 12 V, which could be caused by incorrect connections, will not damage
the input.
Digital Input
Analogue Input
