Quadrature Encoder
Introduction
Version G.5
BitFlow, Inc.
NEO-4-3
4.1.8 Observability
The status of the quadrature encoder system can be observed at any time. Shown in
Table 4-1are all the registers that can be used.:
4.1.9 Electrical Connections
Both TTL and LVDS (differential) quadrature encoders are supported. TTL connections
are shown in Table 4-2 and LVDS connections are shown in Table 4-3.
Note: VFGx - refers to the VFG number that you wish to connect to. For example, if you
want to connect a TLL A output to VFG 0, then you would use VFG0_ENCODER_TTL.
Table 4-1 Observability Registers.
Register
Meaning
QENC_COUNT
Encoder counter
QENC_PHASEA
Phase of input A
QENC_PHASEB
Phase of input B
QENC_DIR
Direction of encoder
QENC_INTRVL_IN
Interval status
QENC_NEW_LINES
Indicates new lines are being acquired
Table 4-2 TTL Quadrature Encoder Connections
Encoder
Frame Grabber
A
VFGx_ENCODER_TTL
B
VFGx_ENCODER_B_TTL
Ground
GND
Table 4-3 LVDS Quadrature Encoder Connections
Encoder
Frame Grabber
A+
VFGx_
A-
VFGx_ENCODER-
B+
VFGx_EN
B-
VFGx_ENCODER_B-
Содержание NEO-PCE-CLB
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