There are several notable differences between the RPi A, and A+. According to the official release, the differences are as follows:
An expanded GPIO header. The A+ has 40 pins which considerably larger than the original 26. Additionally, the new form factor and I2C compatibility allow standard Raspberry Pi hats to be used with the A+ model.
MicroSD. The A+ ...
No it's not an ethernet port (and it doesn't look anything like one either).
It's the videocore JTAG port, that connector is used on all Pi models since the B+ (the original raspberry pi model A and B use a pin header instead). It is used by the engineers who developed the Pi for debugging.
Unfortunately it's not much use unless you have access to broadcom ...
I had a positive experience with RPi camera (Noir or normal) together with one small USB camera. It was quite (resources) expensive, but RPi3 was ok with that.
I have used https://github.com/jacksonliam/mjpg-streamer
In the directory mpjg-streamer was installed:
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:./;./mjpg_streamer -i "input_uvc.so -d /dev/video0 -y 630x480 ...
I an not sure you can actually "halt" the Pi with current Raspbian (although you may be able to write assembler to do so); all the normal shutdown commands run the same code.
The pin 5/6 does work (subject to a few caveats) - although I haven't tried on an A+ it works on all the B models.
If you want safe shutdown, Raspbian now includes code to do this ...
I am not totally sure your setup is right. The wiring seem odd to me, I have never used a Beckhoff BK3150 with 24V supply through the DB9 profibus connector. Is it to power up the HMI adapter?
If I don't get it wrong you want to read the status of the inputs/outputs of Beckhoff I/O system using a Raspberry Pi. Thus, the Raspberry PI must act as a master and ...
The Easy Way
This way works with NOOBS or Raspbian
Buy a $10 USB Keyboard (it's a great investment!) and plug it into your Pi
Connect the Pi to a screen (computer monitor or television)
Boot the Pi and set it up
The Hard Way
This way only works with Raspbian
Download the Linux Mint 17 Live DVD ISO for your laptop
(Windows and OS X can't read the Pi's ...