Delta Tau GEO MACRO DRIVE User Manual download pdf (Page 159)

Geo MACRO Drive User and Reference Manual

Geo Macro Drive MI-Variable Reference 147

MS{node},MI912 Secondary Encoder Index Capture Control

Range: 0 - 15

Units: none

Default: 0

This parameter determines for the index flag which polarity, triggers a position capture of the counter for

the secondary encoder mapped to the specified node. If a flag input (home or index) is used, MI915 for

the node determines which flag. Proper setup of this variable is essential for a successful home search,

which depends on the position-capture function. The following settings may be used:

0: Capture on Index (CHCn) rising edge

1: Capture on Index (CHCn) falling edge

The trigger is armed when the position capture register is read. After this, as soon as the Geo MACRO

Station sees that the specified input lines are in the specified states, the trigger will occur -- it is edge-

trigger, not level-triggered.

MS{node},MI913 Secondary Encoder Home Flag Capture Control

Range: 0 - 15

Units: none

Default: 0

This parameter determines for the Home flag which polarity, triggers a position capture of the counter for

the secondary encoder mapped to the specified node. If a flag input (index or Home flag) is used, MI915

for the node determines which flag. Proper setup of this variable is essential for a successful home

search, which depends on the position-capture function. The following settings may be used:

0: Capture on HOME flag rising edge

1: Capture on HOME flag falling edge

The trigger is armed when the position capture register is read. After this, as soon as the Geo MACRO

Station sees that the specified input lines are in the specified states, the trigger will occur -- it is edge-

trigger, not level-triggered.

MS{node},MI914 Secondary Encoder Filter Control

Range: 0 - 256

Units: 40Mhz Clock Cycles

Default: 0

MI914 controls the rate at which the input signals of the secondary encoder for the specified node are

sampled. The inputs are sampled every (MI914+1) clock cycles, where each clock cycle is

25nanoseconds. Higher values of MI914 can filter out longer noise spikes, but permit lower count rates,

as only one quadrature edge per sample period can be accepted

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Delta Tau GEO MACRO DRIVE User Manual Page 159