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Five switches on the SW1 are used to set the board address. Five binary switches allow 2 5 =32 addresses, but
remember that only 16 CMX can actually be addressed on a single communication line. Never use addresses above 15
(0F Hex); the SW1-4 setting must be always ON.
The switches SW1-1, SW1-2 and SW1-3 are used to define the board type. For the CMX-16/8 they must have the
setting shown in Table 6.1.
The switches SW2-1, SW2-2 and SW2-3 are used to define the meaning that the CMX firmware assigns to the
input/output status. The meaning is assigned to the outputs in groups of eight, and so 3 switches are enough to define
the meaning of 24 inputs/outputs. If the switch is set OFF, the eight outputs (or inputs) corresponding to it are
evaluated active when they are closed ("normal" condition in Table A.2). If the switch is set ON, the inputs are
complemented, i.e. their active status corresponds to the open status. Table A.2, in Annex A, summarize their
meaning.
In the upper left part of board there are two double jumpers, marked JP1 and JP3. Each one has a "A" jumper and a
"B" jumper. Their setting is as follows and must not be changed:
The I/O board (CD 91200) of the CMX-16/8 accepts up to 16 inputs and it is able to drive up to 8 outputs. On the board
it is easy to recognize the two rows of twelve photocouplers each, the small blocks with four pins, the two LEDS blocks
of 24 and 4 LEDs respectively, on the left board side and the 64-pin DIN connector on the right side.
The 24 LEDs are linked to the I/O port. When a LED is ON this means that the input is closed at the corresponding
input port. Note that the LED signifies only a physical condition (i.e. current flowing through the diode), while the logical
meaning of the input is assigned by the switch setting (see Table A.2).
Looking frontally to the LEDs rows, the four lower LEDs have the following meaning (Fig. 6.1):
the upper left is the RS-485 line TX monitor: during normal operation it blinks according to the signals
–
transmitted.
the upper right is the RS-485 line RX monitor: during normal operation it blinks according to the signals
–
received.
–
the lower left is the power supply monitor: it must be steady ON when the CMX is properly powered.
the lower right is the low voltage monitor: during normal operation it is OFF. It lights on when the power
–
supply voltage drops below the lower limit of 11.4 V.
The board layout is common with the other CMX models (CMX-24I and CMX-24O). The CMX-16/8 has only one IC
marked on the PCB as U3 and only the jumper marked W25 is installed.
The only feature that can require a maintenance intervention is the fuse on the lower right angle. The fuse is soldered to
the board and it is intended for board protection and not for field protection. If the fuse blows out, probably there is
something wrong with the board. Send it back to Cerberus Dati for maintenance.
Refer to Chapter 8 of this manual for actual connections to external devices.
The power supply must have the characteristics shown in Table 6.3.
26[51]
SW1-1
SW1-2
SW1-3
Table 6.1 - Board type
JP1
A
OFF
B
ON
Table 6.2 - JP1 and JP3 settings
Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
OFF
ON
ON
JP3
ON
OFF
THE CMX-16/8 BOARD
01.96
E1110A.DOC
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