Oldham MX 52, Installation Manual, Page: 14 / 48

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RS 485 OUTPUT (PINABLE ON FIG 29)
Several MX52 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 MX52 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 programmed and welded
2
nd
case : with galvanic insulation
- mounted and welded insulation component
- no programmed polarization electrical resistance for "plus" (+ 5V)
a) with RS 485 shielded
- no programmed polarization resistor for "moins" (GND)
b) without RS485 shielded
- programmed polarization resistor for "moins" (GND)
End loop resistor
It is located on the MX52 micro board and must be programmed with the last MX52 unit of
the loop (by pins) with a 120 Ohms value.
The MX52 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
- Connect the screwed connector terminals 3,4 and 5, located on the back of the
MX52 unit (repB Fig6). See connection details fig 29.
- Owing to mounted wires or not (following the mounting and the equipment linked
or not on the earth…).
IMPORTANT
All details regarding the RS 485 complete description (Modbus / Jbus format, structures,
adresses aso…) are developped in a leaflet ref. D 813 577.
CAUTION
A computer must be used in order to printout the data stored by the MX52 unit.
1.4.4. Remote acknowledgement
It is possible to allow remote acknowledgement by connecting on connector 5 plugs, on the
back or the micro board : see fig 6 item B.