Specifications

Ethernet Head Station STL-ETH1 (Ethernet)
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MITSUBISHI ELECTRIC
4.2.5 Hardware Address (MAC ID)
Each ETHERNET head station STL-ETH1 has a unique and internationally unambiguous physical
address, referred to as the MAC-ID (Media Access Control Identity). This is located on the rear of the
controller and on a self-adhesive tearoff label on the side of the controller.
The MAC ID has a set length of 6 bytes (48 bits) (hexadecimal). The first three bytes identify the man-
ufacturer. The second 3 bytes indicate the consecutive serial number for the hardware. (e.g.
00:30:DE:nn:nn:nn)
Write down the head station’s MAC address before mounting the head station.
4.2.6 Fieldbus Connection
The connection to the fieldbus is made via two RJ-45 plugs, which are connected to the fieldbus con-
troller via an integrated switch.
The integrated switch works in store-and-forward operation and for each port, supports the trans-
mission speeds 10/100 Mbit/s as well as the transmission modes full and half-duplex and autonego-
tiation. The wiring of these plugs corresponds to the specifications for 100BaseTX, which prescribes
a category 5 twisted pair cable as the connecting cable. Cable types S-UTP (Screened Unshielded Twi-
sted Pair) and STP (Shielded Twisted Pair) with a maximum segment length of 100 m (approximately
328 feet) can be used. The RJ-45 socket is physically lower, allowing the head station to fit in an 80 mm
high enclosure once connected.
Fig. 4-7: RJ45 type modular jack
Pin of the
RJ45 plug
Signal Description
Tab. 4-2: Pin configuration of the fieldbus
interface of the STL-ETH1
1 TD+ Transmit-Data (+)
2 TD– Transmit-Data (–)
3 RD+ Receive-Data (+)
4—
Not used
5—
6 RD– Receive-Data (–)
7—
Not used
8—
b
CAUTION:
Not for use in telecommunication circuits!
Only use devices equipped with Ethernet or RJ-45 connectors in LANs. Never connect these
devices with telecommunication networks.
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