Re: Port #2 Pinout

[Ray Henry <rehenry-at-up.net>]

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