Mitutoyo

pekka1234 · Joined: 28 May 2017 Posts: 83

Ttelmah
You know exactly as it should be.

I have tried with four micrometer devices and asked help from Mitutoyo, but no answer.

There is some problem.

I can't find any information of RD, CLOCK. DATA and REQUEST.
As I told I have done on a reading device 1988 to PC and it worked well.
The oldest device is as old as.

I have tried PowerFIX Z22855F micrometer. It is quite similar to Mitotoyo-
It has 3V battery and Mitotoyo has 1.5V battery.

The ready made Mitutoyo PC read device costs about 200 e.

And my customer needs three of these.

A quite job, but nothing done.

Pekka

temtronic · Posted: Thu Nov 28, 2024 5:22 pm

1st step.. get the correct hardware interface ! You MUST use some form of logic level conversion to convert Mitty 1.5V levels to PIC 5 volt and PIC 5 volt to Mitty 1.5v. Also be sure a Mitty 'high' gives a PIC 'high' and NOT a PIC 'low' signal.

2nd step, cut the code.

NO amount of code (software ) will correct bad or wrong hardware.

Ttelmah · Joined: 11 Mar 2010 Posts: 19529

In his original thread he has the hardware on the wrong pins, and is using
a transistor not a FET for the pulldown. Mitutoyo in their application note
on this say a FET is required, since a transistor won't pull the signal down low
enough.
The reversal though is the real problem. He talks as if REQ should go low.
It doesn't. The PIC has to _pull_ REQ low. It is this that starts the
transaction. It has to be pulled below 0.4v to trigger the start.