Oldham MX 52, Commissioning, Operating And Maintenance Manual

Page: 17 / 96

17
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 "plu" (+ 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 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
- 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…).