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3.2.2
Ethernet Interface
Ethernet interfaces of the Raspberry PI. The Ethernet physics is 10/100BaseT, available through the
shielded modular jack. Twisted pair cable can be used to connect to this port.
The two LEDs indicate Ethernet status as follows:
LED1
No activity
Activity
NOTICE
If your Ethernet cable is long (normative limit = 30 m) or leaves a building, then an
additional protection against surges is required.
Add an external surge protector is such cases. E.g. ground the Ethernet cable shield
where it enters the building or your cabinet.
If you just connect to a nearby switch, such countermeasures are not required.
3.2.3
USB host interfaces (USB1-USB4)
Two USB interfaces are available at the connector panel.
1
NOTICE
Although each port can deliver supply current of 500 mA, the overall load on USB1 to
USB4 interfaces must be limited to 1000 mA to prevent power supply from overheating.
If you draw excessive power from USB ports or short circuit USB power supply outputs,
then the Raspberry PI board will temporarily shut off the USB power supply and retry
every 2 seconds.
© Janz Tec AG
emVIEW-7/RPI3 (Hardware and Software Manual) • Installation
1
RD+
2
RD-
3
TD+
4
n.c.
1
table 2: Ethernet connector
LED2
No Link
10/100 MBit Link
1 +5V, I
= 500 mA, 1000 mA for all ports
MAX
2 USB-
3 USB+
4 GND
table 3: USB host connector
5
n.c.
6
TD-
7
n.c.
8
n.c.
Rev. 1.0
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