
User Manual
M3x5/EN M/B
iSTAT M3x5
Page 23
FIGURE 8-10: EXTERNAL WIRING DIAGRAM: 3-PHASE, 4-WIRE UNBALANCED LOAD (4U)
CAUTION
For accurate operation and to avoid measuring signal crosstalk it is important to avoid
routing voltage measuring wires close to current measuring transformers.
PLEASE NOTE
After the physical connection is complete, settings have to be entered via the keypad that
reflects the connection of the device to the voltage network (connection mode, current and
voltage transformers ratio, etc). Settings can also be done via communication or a memory
card.
8.6
Communications
The
M3x5
can be supplied with either RS232/RS485, USB or Ethernet electrically isolated
communications that must be specified at time of ordering. The communication protocols
that are available are MODBUS RTU and TCP or DNP3 (serial or Ethernet), which are
detailed in the Appendices. The communications allows remote viewing of measurements
and the viewing and setting of system parameters.
8.6.1
RS232 /RS485 Communications
The
M3x5
has a 5-pole terminal for RS232 or RS485 communications.
PLEASE NOTE
When connecting serial communication please note that only RS232 or RS485 should be
used and not both at the same time. Connector terminals that are not used should remain
unconnected otherwise the communications may not work properly.
The connection of RS232 communications has a maximum cable length of 15 metres.
Two-wire RS485 communications enables simultaneous connection to a maximum of 32
communicating devices, over a maximum distance of 1000m. For long cable distances a
terminating resistor (120 ohm) may have to be connected between the 2 wires at the
extreme ends of the cable network.
Connection information will be shown on the label as depicted in Figure 8-11.
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