acquiisition voltage levels in 6551

[Johanna D.]

Hi everyone,

I am using a 6551 to write and read an eeprom. It seems that if i feed the eeprom with 2.5V, the 6551 won't notice the "1s" in the signal; it's acquired as "Zs".

So i fed the eeprom with 5V, and i can write and read.

My question : is it possible to chose (more particularely here lower) the threshold of detection of the 6551?

Johanna D.

[tbob]

Use the niHSDIO Configure Voltage function found in Measurement I/O - HSDIO - Acquisition - Configuration palette.  Two ways to set it up:

1.  Set the polymorphic selector to Data - Custom Levels.  Set the high level input to 1.5 volts and set the low level input to 0.8 volts

2.  Set the polymorphic selector to Data - Logic Family.  Set the logic family input (an enum) to 2.5V Logic.