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ML0035 September 27, 2017 Copyright 2017 Bitronics, LLC
driver. 12 inch-pounds (1.36 N-m) is recommended, MAXIMUM torque is 15 inch-
pounds (1.69 N-m).
Current inputs, option 5: 5 Amp input with internal current isolation transformer,
constructed with 10-32 studs as the current terminals. (See Figure 3A for the
physical construction shown for the current terminals). It is intended that this
meter connect to the output from the secondary of permanently installed Current
Transformers (CTs).
WARNING: DO NOT loosen existing 10-32 hardware that secures the current input
studs to the back panel. When making connections to the current input studs, use #10
ring lugs. Fasten ring lugs with the 10-32 bagged hardware (flat washer, lock washer,
and nut) provided. DO NOT OVERTORQUE. HAND Tighten with a standard nut
driver. 12 inch-pounds (1.36 N-m) is recommended, MAXIMUM torque is 15 inch-
pounds (1.69 N-m). .
Current inputs option C: This option is used with external Split core CTs. External
split core CT secondary wires connect to the current terminal block (see figure 3B).
The Current inputs for this model are touch safe. No internal current isolation is
provided within the meter. DO NOT CONNECT Hazardous Live voltages to the
current input terminal block. Only connect the external Split Core CT secondary
current outputs to the meter’s current input terminal block. Isolation is provided from
the external Split Core CTs. Recommended torque is 9 In-Lbs, 1.02 N-m
3.4 Serial Ports (See section 4.2)
The M650 meters are equipped with an optional serial port. The port is software
(user) configurable for RS-232 or RS-485. The RS-232 drivers support full and half
duplex modes. See Figures 7-8 for signal assignments.
3.5 Ethernet
The M650 Ethernet port meets or exceeds all requirements of ANSI/IEEE Std 802.3
(IEC 8802-3:2000) and additionally meets the requirements of part 8-1 TCP/IP T-
profile for physical layer 1 (Ethernet copper interface).
M650 meters are offered with a standard Ethernet 10/100 Megabit (Mb) RJ45 (copper)
interface (10BASE-T and 100BASE-TX) which automatically selects the most
appropriate operating conditions via auto-negotiation. This interface is capable of
operating either as half-duplex (compatible with all Ethernet infrastructure) or full-
duplex interfaces (which allow a potential doubling of network traffic). Note that the
meters come with the port setup as a service port, with Modbus TCP/IP or DNP3
TCP/IP or UDP software offered as an option. An option to replace the standard RJ45
port with a LC 100BASE-FX fiber port also exists operating at 1300 nm (far infra-red,
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