FlashCut CNC Section 2 Stepper CNC Controller
Rear Panel
The rear panel has connectors for input and output signals as described below.
POWER INLET – Receptacle for the power supply. The unit is shipped with a standard
grounded power cable for use with a 115VAC wall outlet.
USB – USB connector for communication with the USB port on the host PC. Use a USB-A
to B cable with a maximum length of 3 meters to make the connection. For the most robust
communication, plug the cable directly into PC, as opposed to a USB repeater or a hub. If
the FlashCut software loses communication with the Signal Generator, electrical noise may
be the cause. To reduce electrical noise problems, try using a shorter USB cable, or attach
one or more ferrite chokes to the USB cable. Toroid-shaped chokes are more effective than
snap-on cylindrical chokes. If you need more than 3m of USB cable length, you can use an
active extension cable which comes in 4.5m lengths. Note that when running an active
extension cable, the USB will run in Full Speed mode.
INPUT – The connector for up to 8 input lines. The most common use of the input lines
is for limit or safety switches. These lines are all TTL- and CMOS-compatible optically
isolated inputs. When a switch is open, its input signal is high (+5V). When the switch is
closed, its input signal is grounded low (0V). If you need more than 8 input lines, an I/O
extension board is available.
OUTPUT – The connector for up to 8 output lines. These lines are all compatible with
TTL/CMOS level outputs. The Output ports are not setup to drive a 24V external system
unless it accepts TTL/CMOS levels. They are all driven by HCT family logic. Output
logic high is normally 5V and can go down to 3.9V at full load. Output logic low is
normally 0V and can go up to 0.3V at full load. Each of these signals can provide up to
20mA of current. If you need more than 8 output lines, an I/O extension board is
available.
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