Chapter 2 Hardware description
CPU ADAM 821x
2-10
ADAM 8000 Manual CPU 821x – Rev 1.1
A rechargeable battery is installed on every CPU 821x to safeguard the
contents of the RAM when power is removed. This battery is also used to
buffer the internal clock.
The rechargeable battery is maintained by a charging circuit that receives
its power from the internal power supply and that maintain the clock and
RAM for a max. period of 30 days.
Attention!
The CPU will operate only if the battery is healthy.
The CPU will STOP when the battery is faulty. In this case the CPU should
be checked. Please contact Advantech!
The MPI unit provides the link for the data transfer between the CPU and
the PC. Via bus communication you are able to exchange programs and
data between different CPUs that are linked over MPI.
For a serial exchange between the partners you normally need a special
MPI-converter. But now you are also able to use the ADAM "Green Cable"
(Order-No. ADAM-8950-0KB00), which allows you to establish a serial
peer-to-peer connection over the MPI port.
Please regard the notes about the "Green Cable" in chapter 1!
The pin assignment of the MPI socket is as follows:
9pin socket
Pin
Assignment
1 reserved
2 GND
3 RS485_A
4 RS485_CTS
5 GND
6 Vcc
7 +DC
24V
8 RS485_B
9 RS485_RTS
Battery backup for
clock and RAM
MP
2
I port
5
4
3
2
1
9
8
7
6
