CNC4PC C11G User Manual page 10

C11G (Rev.7.1) User Manual
6.4 Using the COM configuration jumper.
This is for selecting the value to get at
the COM terminals found next to step
and direction terminals (Pin 2-9).
Some drivers expect a ground, and
others expect +5vdc. There is a
jumper (X7) that allows you to select
+5VDC or GND for the COM pins.
1-2: COM= 5V
2-3: COM= GND
6.5 External Enable Pin.
The card must be provided with a 5VDC signal to enable operation. This feature
has been added to enable you to control externally the status of the outputs of the
card. You can add en external switch or a Safety Charge Pump to provide the
enabling signal. When the enable signal is not enabled, output signals sent high
impedance state. If you need the communication to be enabled at all times you can
provide the 5 volts directly from the source that is powering the card. Internally this
pin has a 4.7kOhm pull-down resistor.
WARNING: This card must have the power supplied while it is connected to
the PC. If power is removed to the card while it is connected to the PC, noise can
be introduced to the output lines. This can create a dangerous situation as relays
or other devices that might be connected to this card could get activated.
Revision: 28/01/2009 http://cnc4pc.com/TechDocs/C11GR7_1_User_Manual.pdf 10/19