CNC4PC C3 User manual

USER’S
MANUAL
VER. 1
C3 –INDEX PULSE BOARD
Rev. 7
OCTOBER 2019

User’s Manual Page i
USER'S MANUAL
TABLE OF CONTENTS
Contents Page#
1.0 OVERVIEW.....................................................................................................................1
2.0 FEATURES.....................................................................................................................1
3.0 SPECIFICATIONS ..........................................................................................................2
4.0 BOARD DESCRIPTION..................................................................................................2
5.0 USES ..............................................................................................................................3
6.0 INSTALLATION..............................................................................................................3
6.1 Requirements...............................................................................................................3
6.2 Wiring............................................................................................................................4
6.3 RJ45 Connector............................................................................................................4
6.4 Tuning...........................................................................................................................5
7.0 BLOCK DIAGRAM..........................................................................................................5
8.0 CONFIGURATION JUMPERS........................................................................................6
8.1 Active low or active high output..................................................................................6
8.2 Open Collector (OC) or TTL output.............................................................................6
9.0 TROUBLESHOOTING....................................................................................................7
10.0 DIMENSIONS..................................................................................................................8

User’s Manual Page 1
1.0 OVERVIEW
This card provides easy way of capturing the pulse signal from photo-transistor and
transmitting it to the parallel port.
2.0 FEATURES
•Reads an index pulse from the spindle.
•Acts as an optical switch for accurate homing.
•TTL or Open collector output signal.
•Active low or Active high output signal.
•Comes with a Built-in LED that shows the status of the output pin at all times.
•Comes with 6’ pre-wired shielded cable.
•Easy connections. Just put the Photo-Transistor in place, connect the board to the
power supply, and attach the signal output to an input pin from the parallel port.
•Screw-On connections for all terminals. You only have to screw-on the wires to
make all your connections.
•Comes with an RJ45 Connector fast installation. With this connector you just have to
plug in a standard RJ45 cable and will not require further wiring. For more info go to:
http://cnc4pc.com/RJ45.htm

User’s Manual Page 2
3.0 SPECIFICATIONS
Max Frequency
15Khz.
Maximum output voltage (TTL
Output)
(5V power supply voltage) + 0.5V
Maximum supported output
voltage (Open Collector Output)
30V
Maximum off-state voltaje
0.44 V
4.0 BOARD DESCRIPTION

User’s Manual Page 3
5.0 USES
•Threading on a Lath.
•Configure a tachometer on your software. When it is used as a tachometer, you
must provide a disk with perforations on the side to provide the reading for the
phototransistor.
•Use per-rev speed feeds, instead of per-min
•Using it as an optical limit or homing switch.You can place the phototransistor at
the end of travel of an axis to use it as a limit or homing switch.
6.0 INSTALLATION
Please read your software’s manual for configuring your setup. Keep in mind that with
Mach you can use more than one pulse per revolution for increased accuracy. If you
are using Mach, might have to adjust your debounce settings to obtain accurate
readings.
6.1 Requirements
It requires a +5VDC@200mA or power supply to operate
WARNING:Check the polarity and voltage of the external power source and
connect the 5V and GND. Overvoltage or reverse polarity power applied to the Power
Terminals can cause damage to the board, and/or the power source

User’s Manual Page 4
6.2 Wiring
Please note the wiring diagram bellow.
In many cases the photo-transistor provided would not be suitable for your application.
In most cases it could be replaced for other photo transistors. For example, you can
use a reflective photo-transistor, and placing a piece of tape on the spindle.
6.3 RJ45 Connector
The RJ45 connector is for connecting the boards directly using a RJ45 connector with
standard network cable. A standard network cable has straight through wiring. That
means that Pin1 = Pin1, etc…
This Connector is been provided in many of our boards and soon we will have breakout
boards that will come with this connectors. This is to ease the installation process by
eliminating the screw on terminals. The RJ45 connectors are used not just to carry the
I/O signals, but also to power the external board. That way you will have it all in one
connection.
The main I/O is carried in pin5 of the RJ45 connector.
The type of connection is +5VDC, just as the signal coming out of the terminal.

User’s Manual Page 5
6.4 Tuning
Test the card by connecting the photo-transistor, the power supply, and a LED in the
output pins. The LED indicates the output signal status.
Note: Open collector output requires an external pull-up resistor to generate a High.
7.0 BLOCK DIAGRAM
Fig. 2 C3 Block Diagram

User’s Manual Page 6
8.0 CONFIGURATION JUMPERS
This board includes two configuration jumpers in order to select the C3 output features.
8.1 Active low or active high output
1-2: Active Low Output 2-3: Active High Output
8.2 Open Collector (OC) or TTL output
1-2: Open Collector Output 2-3: TTL Output
Note: Open collector output allows generate higher voltage output signal. An external pull-up
resistor is required.

User’s Manual Page 7
9.0 TROUBLESHOOTING
SYMPTOM: THE PC DOES NOT REACT TO THE SIGNAL.
POSSIBLE CAUSE
POSSIBLE SOLUTIONS
- Pin conflict or mach3 configuration.
It is possible that the port address
used for the pin is not right, or that
there is a pin conflict with the. That is
that you are using that same pin twice.
(it could be assigned to a different
function).
- Go to the device manager in windows
and check the memory address used for
the parallel port you are using. Usually it
will be 378 for LPT1. Check also that
the port does not have a conflict. Then
in mach3, go to Ports & Pins / Port Setup
and Axis Selection. Check the memory
address is correct.
- Check that the pin you are using is not
been used anywhere else in your setup.
Got to motor output and output signals
and check all the entries.
- The board does not like the
waveform it is getting. Some
breakout boards could invert the
signals or modify the pulse width.
Changing the active low status of the
pin used also inverts the waveform.
- Play with the active low status of the pin
used for the frequency.

User’s Manual Page 8
10.0 DIMENSIONS
All dimensions are in Millimeters.
DISCLAIMER
Use caution. CNC machines can be dangerous machines. Neither DUNCAN USA, LLC
nor Arturo Duncan are liable for any accidents resulting from the improper use of these
devices. This board is not a fail-safe device and it should not be used in life support
systems or in other devices where its failure or possible erratic operation could cause
property damage, bodily injury or loss of life.