18
RS 485 OUTPUT (PINABLE ON FIG 8)
Several MX48 units can be linked to a single computer, which is the "master" of the network. In
this case, a "SLAVE NUMBER" (by programming/unit) is asigned to each MX48 unit.
This RS 485 output can be galvanically insulated as an option.
1
st
case : no galvanic insulation
- no mounted insulation component
- 2 polarization electrical resistances are welded and programmed with J103 and J104 pins
2
nd
case : with galvanic insulation
- mounted and welded insulation component
- no programmed polarization electrical resistance for "plus" (+ 5V) (J104 programming
pins)
a) with RS 485 shielded
- no programmed polarization resistor for "moins" (GND) (J103 programming
pins)
b) without RS485 shielded
- programmed polarization resistor for "moins" (GND) (J103 programming pins)
End loop resistor
It is located on the MX48 micro board and must be programmed with the last MX48 unit of the
loop (by pins) with a 120 Ohms value.
The MX stored data are some instantaneous values
The RS485 output is a half duplex type.
RS 485 OUTPUT USING
- No change the sub D/DB9 "plug" connector (fig 4 – item A)
- Connect the screwed connector terminals 3, 4 and 5, located on the power supply board
of the MX48 unit. See connection details fig 8.
- Owing to mounted wires or not (following the mounting and the equipment linked or not
on the earth…).
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