Tecomat Foxtrot – system design
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1.1.5.
Interface ETHERNET PLC Foxtrot (interfaces, cables)
The central module is standardly fitted with the Ethernet interface, 10/100 Mbit, RJ-45 connector, refer to
chapter 1.1.5.1. Each Ethernet physical interface (i.e. one physical connection to the PLC) can realize up
to 4 logic data channels (labelled as LCH1 to LCH4), which can be set to several modes and which allow
various system interconnection (further information refer to
TXV xxx xx
) and they are fully independent
from the other PLC communication interfaces (with the exception of system services in the PC+ mode,
which can be active at one moment only on one of the communication channels (physical as well as
logic).
1.1.5.1.
Physical interface ETHERNET PLC Foxtrot
The Ethernet interface is fitted with the standard RJ-45 connector with standard signal distribution. The
connector is ready to be used with common UTP patch cables (for cable connection refer to chapter
1.1.5.2).
Table 1.1.5.1 Connection of Ethernet interface of TC700 modules (front view of PLC connector)
Pin
Signal
Wire colour
8
unused
brown
7
unused
white / brown
6
RD–
green
5
unused
white / blue
4
unused
blue
3
RD+
white / green
2
TD–
orange
1
TD+
white / orange
1.1.5.2.
Connection of direct and crossed ETHERNET UTP cables
The TP (twisted pair) connecting cables are either direct connecting cables (UTP patch cables) or crossed
cables.
The direct TP cable
is the most commonly used cable designed primarily for connection HUB - terminal
(PC network card, PLC Foxtrot, etc.). It is standardly produced and available. The cable is fitted by the RJ-
45 connectors on both ends (8 pins). Only 4 signals are functional (for commonly used 10Base-T
interfaces), the other conductors are not used (outlined by dashed lines on Figure 1.1.5.1).
A twisted pair cable has to be used (a phone line non-twisted cable cannot be used!) and one twisted pair
has always to be used for one data flow direction. For Ethernet cables, the colour coding TIA568B for
conductors in the cable is standardized and most frequently used, see table 1.1.5.1 (for direct cable).
The data UTP cables (non-shielded) and STP cables (shielded - the shielding is not connected on the
PLC side) are produced in several categories, numbered by 3 to 6. For 10/100 Mbit Ethernet (10Base-T),
any of the categories can be used, but at least the category 5 is recommended.
The basic product range of direct cables is supplied under the order number TXN 102 05.xx (the numbers
behind the point specify the cable length according to the product line - see the TC700 catalogue). The
maximum length of the TP cable is limited to 100 metres.
TD+
1
1 TD+
TD–
2
2 TD–
RJ-45
RJ-45
KONEKTOR
KONEKTOR
ETHERNET
ETHERNET
RD+
3
RD–
6
3 RD+
6 RD–
–
4
–
7
–
5
–
8
4 –
7 –
5 –
8 –
Figure 1.1.5.1 Connection of direct cable (ETHERNET UTP patch cable)
RJ-45
ETHERNET
CONNECTOR
RJ-45
ETHERNET
CONNECTOR
