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Appendix C Using the Digital Port
Configuring the Digital Port
Bi-directional Digital I/O
198
The following table describes the possible pin configurations for the
digital port functions. For a complete description of the electrical
characteristics of the digital port, refer to Appendix A.
Pin Function
Digital I/O and Digital In
External Trigger In/Out
Fault Out
Inhibit In
Output Couple
Common (⊥)
In addition to the configurable pin functions, the active signal
polarity for each pin is also configurable. When Positive polarity is
selected, a logical true signal is a voltage high at the pin. When
Negative polarity is selected, a logical true signal is a voltage low at
the pin.
Each of the seven pins can be configured as general-purpose bi-
directional digital inputs and outputs. The ground reference for the
pins is Signal Common on pin 8. Bit assignments are as follows:
Pin
Bit weight
6 (msb)
The I/O pins can be used to control both relay circuits as well as
digital interface circuits, as illustrated in the following figure.
16.5 V Max.
1
2
3
4
5
6
7
I
Relay driver
Pins 1 - 7
(contain internal
clamp diodes for
inductive flyback)
A) Relay Circuits
Available configurable pins
Pins 1 through 7
Pins 1 through 7
Pins 1 and 2
Pin 3
Pins 4 through 7
Pin 8
7
6
5
5
4
1
2
3
4
Coil
Current
0.1 A
Max.
1
2
3
4
B) Digital Interface Circuits
4
3
2
3
2
1
0 (lsb)
5
6
7
I
Digital Output
Pins 1 - 7
5
6
7
I
TTL, AS, CMOS, HC
Digital Input
Pins 1 - 7
Model N6705 User's Guide
1
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