M2x2/EN M/F User Manual
Page 22
iSTAT M2x2
9. HARDWARE
The connections to the M2x2 Measurement Centre are made on the rear as shown in Figure
10-1
FIGURE 10-1 : M232 REAR CASE VIEW
9.1 Connections
Voltage inputs of the M2x2 can be connected directly to a low-voltage network or via a
voltage transformer to a high-voltage network.
Current inputs of M2x2 are achieved by feeding the current carrying cable through a hole in
the current transformers. Connection to the network is performed via a corresponding current
transformer.
The M2x2 has an auto-ranging current input with a nominal 5A and either a fixed voltage
input at nominally 63.5V or an auto-ranging voltage input (option) at a nominal 500V.
Since the M2x2 also has a fully configurable connection mode the default information is
shown as 4u (three phase, 4 wire unbalanced) and the default connection diagram also
shows this connection.
Connection diagrams for the different network structures are shown in Section 16.
9.2 Communications
The M232 ca
n be supplied with RS232, RS485 or USB electrically isolated communications
that must be specified at time of ordering. The M232 supports MODBUS RTU, detailed in
Appendix A, allowing remote viewing of measurements and viewing and setting of system
parameters.
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 distances 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 is shown in table 10-1.
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