9
Figure 2 : OLCT10N dimensions
Connection
RS485 transmission
There are two cable entries on the OLCT10N, one entry is for the input signal and
one is for the output signal – this is used for digitally connecting multiple
transmitters on a single line to the MX43 Controller.
The digital modules are linked by 2 twisted cable pairs of 4 x 0.22 m² minimum,
type MPI-22A, nominal resistance of 120 Ohms. This cable carries the RS485 (A
and B) signal on one pair and the power supply of the modules (0–24 VDC)
connected to the line on the other pair. The + 24 VDC, 0V, A, B terminals are
respectively connected to +24VDC, 0V, A, B terminals of the other modules on the
line and then to the connector of the corresponding line on the central unit. The
cable shielding must be connected to the grounding rod of the MX43.
At the end of the busbar, the 120-Ohm end of line resistor (
EOL
RESISTOR/RESISTANCE F.D.L
) must be activated (switch n°8 must be set to ON, cf
fig 5).
No portion of the bare end of the terminal wires should be visible. For protection
against any electromagnetic disturbances, the data as well as screen wires (or
braids) must be cut as short as possible.
