AKG DFM 4X4 Quick Reference Manual page 11

The 13 Programmable Input pins can control a variety of DFM4x4 parameters. Each input can respond to either a
contact closure or a continuous voltage. Figs. 12 to 14 show some common connections to the Programmable Input
pins.
Each Programmable Input is internally pulled up though a 100K resistor to +5 VDC, so no external pull-ups are necessary.
When using a continuous voltage with one of the Programmable Inputs, set the function of the Programmable Input
to either "Analog Input Control" or "Analog Output Control" in the "Function" line on the "Programmable Input" tab
in the control panel of the LecNet software.
Fig. 12: Using a 10k linear pot (1) for
analog gain control.
2 = CCW -> ground.
3 = Center pin -> Programmable
Input pin (4).
5 = CW -> +5 V.
The 8 Programmable Output pins of the DFM4x4 can indicate the current state of a Programmable Input.
Each Programmable Output is the electrical equivalent of a contact closure to ground. When a Programmable Output
is "active", it conducts current to ground. The maximum acceptable voltage for each Programmable Output is 40 V
and they will safely conduct up to 100 mA DC continuous.
You may run LEDs from the +5 VDC pin on the Programmable Input connector as long as the total LED current for
all LEDs on does not exceed 100 mA.
Similarly, you may also run 5-V relay coils from the +5 VDC pin on the Programmable Input connector, as long as the
total coil current does not exceed 100 mA.
Note that fig. 17 shows an external DC source powering the relay coil. This will be necessary if coil voltages above
5 V are needed.
Figs. 15 to 17 show some common connections to Programmable Output pins.
Fig. 15: LED is ON when the
Programmable Output is active.
1 = +5 VDC from Programmable
Input pin 14
2 = Programmable Output pin
3 = 380
Fig. 13: Contact closure (1).
2 = ground,
3 = connection to Programmable
Input pin.
Fig. 16: LED is OFF when the
Programmable Output is active.
1 = +5 VDC from Programmable
Input pin 14
2 = Programmable Output pin
3 = 380
4 = Gnd (from programmable output
pin 15)
4 Operating Notes
Fig. 14: DC voltage source (1), con-
tinuously adjustable from 0 V to +5 V.
2 = ground,
3 = connection to Programmable
Input pin.
Fig. 17: Relay is ON when the
Programmable Output is active. Max.
coil current is 100 mA.
1 = Relay coil
2 = 1N001 diode or equivalent
3 = External DC voltage source
(<40 VDC)
4 = Programmable Output pin
5 = Gnd (from programmable output
pin 15)
4.3 Wiring
Programmable Input
Pins
Figs. 12 to 14.
4.4 Wiring
Programmable Output
Pins
Figs. 15 to 17.
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