MX32v2
ANALOG AND DIGITAL CONTROLLER
USER MANUAL
Revision D.0
5.2 RS485 Transmission
General Topology of RS 485 Network The digital modules are linked by a two twisted pair
shielded cable (4 x 0.22 m² minimum, MPI-22A type, nominal impedance 100 Ohms). This
cable carries the RS485 signal (A and B) on one pair and the power supply (24Vdc) on the
other pair. Shielding continuity must imperatively be carried out between all the modules and
the
MX32v2
controller. + 24Vdc, 0V, A, B terminals are respectively connected to +24Vdc, 0V,
A, B terminals of the other modules and then to the terminal of the corresponding line on the
controller. The cable shield must be connected to the
MX32v2
ground terminal.
The 120-Ohm end of line resistor (EOL RESISTOR/RESISTANCE F.D.L) must be activated on the
last module present on the bus (whatever the last module).
No bare wire
should remain apparent. For protection against electromagnetic
interference, the shield (or braid) should be cut as short as possible and necessarily
connected.
Figure 11: Connection of the modules on a line
The incorrect installation of the cables or cable glands can cause measurement error
or system malfunction.Do not run the cables close to equipment such as engines,
transformers, or electrical lines generating a strong magnetic field. It is always
recommended to ensure a good separation between these cables and the cables of
other circuits.
5.3 Communication Setup
All digital modules must be identified by a unique address.
On all modules, DIP switches #1 to #5 allow to set the address
in binary mode.
In the illustration to the right
, address 9 (10010) has been
defined.
The Addressing Table below lists the possible combinations.
Figure 12: DIP switches for
address configuration
Terminal (detector, module)
MX32v2
Ground terminal
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