AMX NXP-CPI16 manual Qdir

QDIR	Please note that the actual direction of rotation for a positive level change will depend
Controls the direc-	upon the phase relationship of the outputs on the quadrature encoder selected. If the
	correct phase relationship is not met, it may be necessary to send a CCW (counter-
tion of rotation that
	clockwise) QDIR command to get a positive level change for a clockwise rotation of the
will correspond to a
positive level	encoder.
increase on the	Syntax:
quadrature inputs.	‘QDIR <input #> <direction or rotation for a positive level
The default rota-
	change>’
tion for both
	Variables:
quadrature inputs
is CW (clockwise).	Where <input#>
	1 - Quadrature Input 1
	2 - Quadrature Input 2 and <direction of rotation for a positive level change>
	CW - Clockwise rotation
	CCW - Counter-Clockwise rotation
	Example:
	SEND_COMMAND ‘QDIR 2 CCW’
	The quadrature input 2 is set for counter-clockwise rotation.
QRATE	Syntax:
Sets the number of	‘QRATE <input #> <# of pulses that represent the maximum level
pulses that must	allowed>’
be seen on the	Variables:
quadrature input in
	Where <input #>
a given direction in
	1 - Quadrature Input 1
order to reach the
maximum attain-	2 - Quadrature Input 2
able level.	and <# of pulses that represent the maximum level allowed>
	0-32,767
	This number should be calculated as follows:
	Pulses = <pulses/rotation> x <# of rotations to reach maximum level>
	The default for Pulses is 24.
	Example:
	Pulses/rotation = 50 (get from encoder data sheet)
	# of rotations desired to reach max. level = 2
	Therefore, the equation reads: 50 x 2 = 100.
	This value will be used to scale the level reported to the NetLinx master as follows:
	level change = (<maximum level> / <Pulses>) x <current pulse count>
	Example:
	SEND_COMMAND ‘QRATE 1 100’
	The full range of quadrature input 1 is set for 100 pulses from the encoder.

The NXP-CPI16 uses input channels to report user input on the contacts or switches attached to the input terminals. Output channels are used to turn on the lamp or LED display devices to indicate the button status to the user.

The NXP-CPI16 default mode is STATUS-OFF, and in this mode the programmer cannot poll the NXP- CPI16 to determine the state of the output channel. This is because in this mode the output and input channels use the same number assignments. Inputs are sent by the NXP-CPI16 only as input changes.

When set for STATUS-ON mode the output channels are assigned a different channel number than the input channels. This allows the programmer to monitor the status of an output channel. However the channel offset must be accommodated in the programming code.

Statements such as this example can be used in a program.

IF[CPI16,25] (* output channel assigned to input channel 9 on P3 connector *)

8 NXP-CPI16 NetLinx Custom Panel Interface