ATI Technologies SmartTachSmartTach, User Manual

Page: 47 / 110

PARAMETERS
SmartTach Operating Manual Page 4-17
23 - Trigger Input 5V Pull-Up
Parameter Group:
TrgInp
Options:
PuOff
- Pull-up disabled
PuOn
- Pull-up enabled
Default:
PuOff
- Pull-up disabled
Purpose: This parameter is used to accommodate Trigger sensors having
"open collector" outputs (typically some hall-effect type sensors).
When this parameter is enabled, the equivalent of a 1000 ohm
resistor is placed between the input and an internal 5 volt power
supply.
How to Set: This parameter should only be enabled if the input is used with an
open collector output type sensor. This type of sensor has two
output states, open and ground. It actually produces no output
voltage. This parameter may be automatically set for certain
Trigger Input Signal Level options.
NOTE: When parameter 20 is set to TS1, this parameter will be set to
Auto and cannot be changed.