THE CMX-24O BOARD
E1110A.DOC
Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
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5 The CMX-24O board
The CMX-24O is the CMX board with 24 outputs and no inputs. The CMX-24O is composed of a CPU board (marked
CD91201) and an I/O board (marked CD91200), connected together (see Fig. 5.1 for board layout and assembly).
The important features to be detected on the CPU board are:
•
the reset pushbutton
•
the switch block marked SW1
•
the switch block marked SW2
Although the CPU board layout is the same for all the CMX models, the boards are configured and operate differently
in the three CMX models. The CPU board contains all the hardware and software needed for communications and
interfacing. You can easily recognize the big CPU chip, and next to it the quartz crystal (XTAL) in its metal case. I you
look at the board with the CPU chip at right, you can detect at the right of the quartz a small black pushbutton.
I/O BOARD
CPU BOARD
FRONT
VIEW
I/O 1
I/O 23
I/O 2
I/O 24
TX
POWER ON
RX
BT
W25
W26
W27
Fig. 5.1
This is the reset pushbutton, that starts the CMX diagnostics routines and reset the field status. This pushbutton has to
pressed only when the CMX needs a full restart. Be careful in using the reset pushbutton on the CPU board of CMX-
24O: when it is pressed all the outputs are set into a non-active status.
A new command from the supervision
center is needed to re-activate them
.
At the right of the CPU chip, at the upper and lower side, there are two switch blocks, used to set:
−
the baud rate (SW2-6, SW2-7, SW2-8) : see Annex A, Table A.1;
−
the I/O status (normal/inverted) (SW2-1, SW2-2, SW2-3) : see Annex A, Table A.2;
−
the board network address (SW1-4, SW1-5, SW1-6, SW1-7, SW1-8) : see Annex A, Table A.3;
−
the board type (SW1-1, SW1-2, SW1-3): see Table 5.1.
