RE: Port #2 Pinout

["Tim Goldstein" <timg-at-ktmarketing.com>]

It is at www.ktmarketing.com/CNC.html then look for the link titled
"Parallel Port Hookup to Controller". It is about the 5th from the top.

Tim
[Denver, CO]


> -----Original Message-----
> From: emc-at-nist.gov [emc-at-nist.gov] On Behalf Of Ray Henry
> Sent: Monday, May 06, 2002 10:16 PM
> To: Multiple recipients of list
> Subject: Re: Port #2 Pinout
> 
> 
> 
> 
> Patrick
> 
> Marc is right on that there are 12 outs on the normal 
> parport.  There are 
> also five ins.  I believe that Tim at ktmarketing.com has a 
> listing.  The way 
> that I do it now days is to start the script named 
> IO_show.tcl which appears 
> under the tkemc gui menu item scripts.  It has a toggle 
> button that will show 
> all of the most common definitions of each pin.
> 
> Ray
> 
> On Monday 06 May 2002 21:38, you wrote:
> >   ----- Original Message -----
> >   From: Patrick Riedlinger
> >   To: Multiple recipients of list
> >   Sent: Monday, May 06, 2002 3:02 PM
> >   Subject: Port #2 Pinout
> >
> >
> >   Hello, anybody:
> >
> >   I am retrofiting a Enco Mill/Drill with steppers and EMC. I was 
> > looking at the bridgeportio.ini and I realeazed the following:
> >
> >   A) I can use Port #2 to for coolant and spindle 
> actuations and such.
> >
> >   B) The "numbers" assigned to different functions in the ini file 
> > under port #2 are D0, D1, D2..repectively. They are not pin numbers.
> >
> >   C) I can look at a standard 25 pin schematic and some of the data 
> > port pins decribed in bridgeportio.ini are treated as outputs...and 
> > the output section of a par. port has only 8 data out 
> bits....so EMC 
> > is using more than 8 data out bits? Huh?
> >
> >   Item C confuses me assuming that I got item B correct.
> >
> >
> >   If I blew it, would somebody please send me or direct me to the 
> > correct pinouts for the bridgeport io? And if I just 
> stubbed my toe, 
> > please educate me.
> >
> >   Thanks in advance,
> >
> >   Since I didn;t See another reply I'll give it a shot, 
> even though I 
> > have no direct experience and have not looked at the file 
> in question.
> >
> >   (C) Has an assumption that is not correct, there ARE more that 8 
> > outputs on a standard IBM printer port. For Starters Look 
> at the way a 
> > regular printer works.
> >   First The Data is set on data lines 0-7, THEN The (Strobe 
> line) is 
> > pulled LOW Then Back High. This step is what latches the 
> data into the 
> > printer itself.
> >   Those -3- things need to be done by SOFTWARE for each character 
> > printed.
> >
> >   IF you decide to follow another handshaking protocol 
> things can work 
> > differently. Right there we are using 9 outputs, there are 12 by 
> > default.
> >
> >   Be aware the <Other> 4 outputs are almost always "Open Collector" 
> > and are not "Driven" to a high 5V As such you need to add a 
> "Pull-up".
> >
> >   The simple description is that it's like a bucket with a valve,
> >   "Full of water" is ON and Empty is OFF.
> >   With "Open Collector" the only thing you control is the 
> valve, the 
> > "Pull-Up" is like a hose running water into the bucket ALL the time.
> >   The "Flow" needs to be sized to allow the "Open" valve to 
> empty and 
> > keep the bucket empty when open but allow a quick refilling 
> when the 
> > valve is shut.
> >
> >   Another common problem is reverse logic used by some of the pins.
> >   Sometimes the logic is reserved so that "Asserted" is a 
> low voltage
> >   and "Negated" is high.
> >   The logic states of some of the pins are like this and 
> you need to 
> > remember that in your code or hardware connections. In other words 
> > sometimes you need to Write a "1" to get a low voltage or a 
> "0" to get 
> > a High instead of what you'd assume.
> >
> >   There are several parallel port FAQs on the web.
> >
> >   <<QUOTE>>
> >   Pin signals and register bits
> >
> >   <= in   DB25    Cent    Name of         Reg
> >   => out  pin     pin     Signal          Bit     Function Notes
> >   ------  ----    ----    --------        ---    
> > ----------------------------- =>       1       1      
> -Strobe         C0-  
> >   Set Low pulse >0.5 us to send =>       2       2      
> Data 0          D0 
> >     Set to least significant data =>       3       3      
> Data 1         
> > D1      ...
> >   =>       4       4      Data 2          D2      ...
> >   =>       5       5      Data 3          D3      ...
> >   =>       6       6      Data 4          D4      ...
> >   =>       7       7      Data 5          D5      ...
> >   =>       8       8      Data 6          D6      ...
> >   =>       9       9      Data 7          D7      Set to 
> most significant
> > data <=      10      10      -Ack            S6+ IRQ Low 
> Pulse ~ 5 uS,
> > after accept <=      11      11      +Busy           S7-    
>  High for
> > Busy/Offline/Error <=      12      12      +PaperEnd       
> S5+     High for
> > out of paper <=      13      13      +SelectIn       S4+    
>  High for
> > printer selected =>      14      14      -AutoFd         
> C1-     Set Low to
> > autofeed one line <=      15      32      -Error          
> S3+     Low for
> > Error/Offline/PaperEnd =>      16      31      -Init        
>    C2+     Set
> > Low pulse > 50uS to init =>      17      36      -Select    
>      C3-    
> > Set Low to select printer ==      18-25   19-30,  Ground
> >                  33,17,16
> >
> >   Marc Christensen
> 
>