Oldham MX 52, Installation Manual

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1.4.2. 4-20 mA current outputs (Fig. 12)
For each measuring channel, the MX52 unit is equipped with a 4-20 mA output that can be
used to retransmit measurements to a recorder or an external PLC. The maximum resistance
in loop mode is 600 ohms. The earth connections for the 4-20 mA outputs are common and
the unit. The 4-20 mA lines are not galvanically insulated one from the other. The current
output varies according to the measurement and has several states, as follows:
- On starting up the unit: I < 1 mA
- With FAULT: I < 1 mA
- In MAINTENANCE mode: I = 2 mA
- ZERO MEASUREMENT: I = 4 mA
- Full scale: I = 20 mA
-
Out of range or “in doubt”: I > 23.2 mA
An example of the connection of a multi-channel recorder is given in Fig. 25.
1.4.3. RS 232 and RS 485 outputs
RS232 OUTPUT
A computer can be connected on a female sub.D/DB9 type connector located on the back of
the micro board (fig6 repA). The MX52 programming, from outside, will be possible thanks
to this connection.
RS 232 OUTPUT USING
- Remove the DB9 connector (pmug with an internal strap)
- Connect a link cable ref.6315831 which will link the monitor to the computer on
the MX52 available female connector DB9 (repA Fig6)
MX52
ORDINATEUR PC
Cordon liaison PC/MX52
( 1 )
( 2 )
- when the using is stopped : no connect the cable and put the male DB9 "plug"
again.
Female DB9
Male DB9
MX52
PC COMPUTER