Low Voltage Line
PLC Modems

PLC Modems designed for use at existing Low Voltage lines up to 1 000 V. They provide data channel with excellent noise immunity and long communication distance (up to 5 km) without the need for repeaters.

Modem MT49S / MT49R / MT34R

PLC modem for use in Power Line Carrier Communication over Low Voltage Lines. Provided PLC Communication is stable, reliable, and operates successfully also in disturbed environment.

Key features:

Operates on any power lines 0 to 1,000 V
Extraordinary communication distance up to 5 000 m
Communication interfaces RS485, RS232 or RS422*
Single-phase and three-phase variants
Advanced DSP algorithms and error-correction codes
Routing in the network
High transmission output, narrowband communication
Easy configuration through RSet application

*Valid for MT34R modem

Typical applications:

Communication in the industry and transport
- Production processes, energy balance
- Connection with remote sites (boreholes, treatment plants, Photovoltaics …)
- Maritime transport automation systems
Smart grids
- Meter readings (electricity, water, heat, gas …)
- Distribution control
Building automation
- Industrial areas, office and residential buildings
- Museums, archives, historic buildings, halls and stadiums

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Modem Comparison

MT49S Modem is designed to provide a data connection via existing 230 V power lines. The advantage of the modem is automatic and adaptive build of G3-PLC network according to the parameters of LV line and creation of an encrypted tunnel for transparent data transfers. It allows to use any protocol (Modbus, DLMS, Profibus, etc.) using standard interfaces such as RS485, RS232 or Ethernet.

Modem MT49R is an intelligent interface between PLC communication line and connected device with serial line (i.e. PC, programmable logic controller, intelligent e-meter etc.). Module receives data from connected device via serial line and subsequently trasmits received data to the PLC communication channel. You can transfer data in any protocol to a maximum length of one packet of 60 Kbyte.

MT34R Modem is designed to realize a data connection over an existing 230/400 V power lines. It has RS485, RS422 or RS232 serial interface, which can transfer almost any protocol, thanks to the transparent mode. The device can be operated not only in pair mode for interconnected two points, but it is also possible to create larger networks containing repeaters.

	MT-49S	MT-49R	MT-34R
Number of phases for Rx/Tx	1	1	3
PLC standard	MTEC, G3-PLC	MTEC	MTEC
Max. communication rate	280 kbps	10 kbps	10 kbps
Interfaces	RS232, RS485, Ethernet	RS232, RS485	RS232, RS485, RS422
Carrier frequency adjustment	✓	✓	✓
Possibility of external coupling	✓	✓	✓
Binary state transfer	✓	✗	✗
Automatic routing	✓	✗	✗
Advanced encryption	AES-128	✗	✗

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Technical Specifications

PLC communication

Carrier frequency	154 – 487 kHz (MT49S) 60 – 145 kHz (MT49R) 40 – 120 kHz (MT34R)
Modulation	DBPSK, DQPSK, D8PSK
PLC standard	MTEC
Output amplitude	134 dB/µV (MT49S/R) 128 dB/µV (MT34R) (R_L = 12 Ω)
Output current	Max. 1 A_PP (MT49S/R) Max. 2 A_PP (MT34R)
Input sensitivity	1 mV
Amplitude adjustment	Yes, manual
Minimal SNR	> 3 dB (PER 10-4) (MT49S) > 9 dB (PER 10-4) (MT49R/34R)
Protection	Over-current, short-circuit, thermal
PLC coupler	Built-in internal
Output to an external coupler	On request

*Valid for MT49S modem

Power supply

Voltage	85 – 305 V_AC (MT49S/R) 100 – 430 V_DC (MT49S/R) 3×230/230 V ±10 % (MT34R)
Frequency	47 – 440 Hz (MT49S/R) 50 Hz ± 3 % (MT34R)
Power consumption	Max. 15 W (MT49S/R) Max. 40 W (MT34R)

Dimensions and weight

W x H x D	106 x 90 x 57 mm (MT49S/R) 250 x 235 x 150 mm (MT34R)
Weight	450 g (MT49S/R) 1500 g (MT34R)

Data interface

Main data	RS485, RS232, RS422*
Galvanic isolation	Yes
Protocol	Transparent mode
Baudrate	300 – 230400 bps
Data bits	7, 8
Parity	None, odd, even
Stop bits	1, 2
Data buffer	8 kB (MT49S) 64 kB (MT49R/34R)

*Valid for MT34R modem

Environment

Operating temperature	-40 to +60 °C
Storage temperature	-40 to +70 °C
Relative humidity*	0 – 95 %

*No water condensation

Safety

Electrical appliance class II – double insulated
Comply with	EN 61010, EN 60529, EN 61000, EN 60870, EN 50065

Mounting

Mounting	DIN 35 rail mounting (MT49S/R) BP CombiCard 6000 (MT34R)
Enclosure	Plastic
IP rating	IP30 (MT49S/R) IP65 (MT34R)

MT49S Modem Variants

The MT49S modem comes in 8 different variants, based on the capabilities supported. These variants are explained by the following table:

Variant	G3-PLC	RS232, RS485	LAN	External PLC Coupler	4x binary I/O
MT49S	✓	✓	✗	✗	✗
MT49S-G	✓	✓	✓	✗	✗
MT49S-C	✓	✓	✗	✗	✓
MT49S-C	✓	✓	✗	✓	✗
MT49S-GB	✓	✓	✓	✗	✓
MT49S-GC	✓	✓	✓	✓	✗
MT49S-BC	✓	✓	✗	✓	✓
MT49S-GBC	✓	✓	✓	✓	✓

PLC Modems Data Sheets