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Internet Gateways

To connect a RHINO-2 Power-line Carrier Network (PLCN) to the Internet, a gateway is needed between the IP-network and the PLCN. The PLC Segment Builder has a RJ-11-6 connector for  RS232 communication. This port is used for connecting to a GPRS/3G modem or RS232 to IP Converter.
If access to the building-LAN is possible a RS232 to IP Converter solution should be preferred. However very frequently that is not the case. Very often electricity meters, etc. are located in old cellars where there is no Ethernet-connectors and WiFi-Ethernet is not possible or unstable. Also, this is often the case in street-cabins and other locations where the Segment Builder is installed. In those cases the only solution is to install a GPRS/3G modem to interface the PLCN to the Internet.

greenRJ45The new Rational Network line of hardware will have standard RJ-45 ethernet port instead of the old fashinoed RS232 port. It can therefore be plugged directly to the building LAN when permitted. However as discussed above, most cases this is not possible or not permitted. In that case a GPRS/3G router is needed to interface the device network to the Internet.

Rational Network relies on such gateway hardware from 3d parties. Below are some products that we have extensively been using with good results:

RS232 to IP converters:

Tibbo DS203 Serial Device Server is known to be cost-effective, It can be purchased directly from Rational Network. Last, but not least important, it can be configured to initiate communication with our Control2Net server, eliminating the need of opening ports in the building LAN Router. This is vital as it is often hard to convince IT-manager to open such ports.

GPRS/3G modem:

TeltonikaRS232 to ip

For the current PLC based hardware with RS232 interface we recommend the Teltonika ModedCom/G10. This is a full blown GPRS/3G modem with a RS232 port that can be connected to the PLC based Segment builder or PLC Logger with a straight RS232 cable (not cross cable).

GPRS/3G Router:

TeltonikaRouterFor interfacing our new WELC hardware or the Energy Tracking loggers to the Internet, we recommend the Teltonika RUT500 GPRS/3G router. This device is a perfect fit to both device-prodcuts mentioned. Although this is a very powerfull gateway it is known to be very cost effective compared to Teltonika competitors GPRS/3G-gateways.

Cabling.

It is often confusing to select the right type of cable to connect the Internet Gateway to the serial port of the Segment Builder or a PC. The Segment Builder is provided with RJ-11-6 connector to its RS232 port.

1 RTS Output
2 TX+ Output of SB
3 Gnd (TX- in RS-422/485)
4 Gnd (RX- in RS-422/485)
5 RX+ Input to SB
6 CD Input

Only TX, RX and Gnd are used.

When connecting the Segment Builder to the Internet Gateway, the correct cable is always a straight cable:

Internet gateway
DB9M (Male)

Segment Builder
RJ-11 (Female)

#2

#2

#3

#3

#4

#4

#5

#5

#6

#6

#7

#7

#8

#8

However when configuring an Internet Gateway via the serial port using a PC-computer, the cable should be a NULL modem cable:

PC-serial port
DB9F (Male)

Segment Builder

RJ11 (Female)

#2

#3

#3

#2

#4

#6

#5

#5

#6

#4

#7

#8

#8

#7

Internet Gateways

Rational Network Internet Gateways

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