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# Digital I/O Screen

The Digital I/O Screen displays and allows changes to the current state of KFLOP digital I/O bits. Digital IO bits are present on the KFLOP as well as any additional option cards (such as with two SnapAmps or Kanalog as shown above). IO bits are numbered 0-167.

KFLOP has a number of digital I/O bits that may be used as GPIO (General Purpose Inputs or Outputs) or as specific dedicated functions (ie. encoder inputs). There are 46 bits that may be utilized as GPIO (bits 0 - 45). Each bit may be independently defined as either an input or an output. On Power UP KMotion defines all I/O as inputs by default. Any bit may be configured as an output by checking the corresponding box in the "Output" columns. Alternately, the bits may be configured by a C program running within the KMotion (See SetBitDirection()) or by Script commands (See SetBitDirection) sent to the KMotion.

KFLOP bits 0-15 are connected to the JP7 connector normally which may be used to connect to auxiliary option boards such as Kanalog. These bits are available for User use if no option cards are requiring them in the system.
If they are used to communicate to an option board care should be taken to not issue any User IO commands to these bits.

KFLOP bits 16 - 25 are connected to the Aux#0 connector normally used as a high-speed communication bus to connect to auxiliary option boards such as SnapAmps. These bits are available for User use if no option cards are requiring them in the system.
If they are used to communicate to an option board care should be taken to not issue any User IO commands to these bits.

The State of each I/O bit may be observed in the corresponding checkbox under the "State" columns. If the bit is defined as an output, clicking on the "State" checkbox will toggle the bit. Alternately, the bits may be read, set, or cleared by a C program running within the KMotion (See ReadBit(), SetBit(), ClearBit(), or SetStateBit()) or by Script commands (See ReadBit, SetBit, ClearBit, or SetStateBit) sent to the KMotion.

Additionally, buffered commands may change the state of Digital I/O bits. Buffered I/O commands are I/O commands that are inserted into the coordinated motion buffer. When it is required that I/O bits be changed at exact times within a motion sequence, buffered I/O commands may be inserted into the motion buffer (see SetBitBuf, ClearBitBuf, and SetStateBitBuf). In this case the I/O commands occur when they are encountered within the motion sequence. The KMotion GCode interpreter allows buffered I/O commands to be inserted within motion sequences by using a special form of GCode comment (See buffered GCode Commands).

See the KFLOP Hardware Connector Descriptions, SnapAmp Hardware Connector Descriptions, Kanalog HardwareConnector Descriptions, or KStep Hardware Connector Descriptions for which IO bits are connected to the various connectors on those optional boards.

Caution: Shorting High Voltage (greater than 3.3V or 5V depending on pin tolerance) to any Digital I/O bit will be likely to cause permanent board damage.

Digital I/O bits 46 and 47 are dedicated to the control of the two LED's on KFLOP. These two outputs are configured as outputs and tuned on when KFLOP powers up. The are available for use as User status if desired.