17
2.4.2. 4-20 mA current outputs (Fig. 12)
For each measuring channel, the MX48 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.
2.4.3. 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 (fig 4 repA). The MX48 programming, from outside, will be possible thanks to this
connection.
RS 232 OUTPUT USING
- Remove the DB9 connector (plug with an internal strap)
- Connect a link cable ref.6315831 which will link the monitor to the computer on the
MX48 available female connector DB9 (Fig 6)
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