TM70Bi V3.2 (11/02)
1121174 L0.pdf
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16.1 - INTRODUCTION AND FUNCTIONAL DESCRIPTION
The IN4D electronic card provides 4 digital inputs interface to the TM70 receiver. This card can be
connected as an expansion -as single card- in the LR70 receiver card through P16 connector. The
IN4D card can also be used as a multi-digital input using the INCAN option (multiple IN4D inputs
option), as an alternative to the single one.
The IN4D card is basically a four digital to analogue signal converter. The four digital signals (IN1,
IN2, IN3 and IN4) are converted to a 0 to 3 volts analogue value, available in the LR70 (or in the
INCAN card). See figure 1.
The four digital inputs, IN1, IN2, IN3 and IN4 must have the following analogue values, in reference to
the pin 6 (GND) ; I3 connector:
0 to 4V is equivalent to a deactivated state or ‘0’ logic state.
8 to 28V is equivalent to an activated state or ‘1’ logic state.
See I3 connector: 1 to 6 pins.
Very important remark: Do not apply higher voltages than 28 volts, in order to prevent card’s
damage.
+VI
IN1
IN2
IN3
IN4
GND
IN4D
1
2
3
4
5
6
I3
1
2
3
4
5
6
I1
Figure 1
