🚀 go-pugleaf

In article <846884133.2789.0@intra.demon.co.uk>, Paul
<paul@intra.demon.co.uk> writes

>In the process of testing the circuit I must have blown something on the
>i/o card as the voltage has dropped from 4.3V to 3.2V on one of the pins
>( I was warned about this, but at least I wasn't using my 586 with on
>board i/o). I checked some resistors on the card and replaced one 22ohm
>that had risen to 34 ohms but still only get 3.2V. Any ideas ?

The output voltages on com ports ought to be in the range +5 to +15 or
the range -5 to -15.  Three point anything seems a bit pathetic !


>I am now using a spare i/o card which gives slightly more than 5V on
>pins 2 to 9. However the 'logic' is the opposite way round to the last
>card i.e. PC boots with pins set high, releasing 5V, I then set all pins
>low by sending 1's not 0's (out &h378,127) in my autoexec. I then need
>to send 0's to the pins to set them high. I have had to edit my software
>which I wrote for the first card to operate my second card. Is it
>correct for different cards to have different logics, or am I doing
>something wrong.

The two uarts may have different behaviors when reset.


>I am still looking for interfacing details for 3 phase motors. My friend
>bought a cheap  'robotic  (CNC) manipulator' at an auction which has
>several  stepper motors used to manipulate the  'tool holder' position.

OK, but 3-ph and stepper motors aren't the same thing !  What exactly do
you want to control ?


>We have no details on how it operates and numerous wires have been
>severed (but they are colour coded).  I should be able to write software
>to manipulate the tool holder but I first need to build/buy the
>interfacing circuits. I will find out what power ratings the motors are
>and post them here when I have them. Can the cassette recorder driver
>just be uprated for the higher power required by the 3 phase motor (with
>a solid state relay replacing the transistor).

Depends what you understand by 3-ph.  Are we talking mains powered star
or delta wired steaming great 240/440 Volt thing or are we talking
stepper motor ?

A 3-ph motor will require a 3 pole relay/contactor.  A stepper motor
will need a stepper controler or some software that you write to drive
power transistors to control each pole of the motor.


Cheers, J/.
-- 
John Beardmore