1 689 989 380 | 2018-08-01
Robert Bosch GmbH
US declaration of conformity
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The ET250 may only be used by trained and
instructed workshop personnel. The ET250 is
not suitable for installation and use by end
consumers as improper installation or use
may lead to the vehicle behaving incorrectly
while driving and cause severe injury or
death.
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Certification for Ukraine
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Certification for the Russian Federation
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Certification for Australia
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Li-ion
Recycling of the portable battery for Japan
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3.6 Functional description
The OBD connection cable is used to connect the
ET250 to the vehicle. Operation is by hand using the
TFT touchscreen and the on-screen keyboard. While the
device is connected to the vehicle by OBD interface, it
is possible to perform a control unit diagnosis and to
read the OBD fault memory of the vehicle. An external
printer (optional accessory) connected by WLAN can be
used to print the data and measured values. The ET250
and the accessories are supplied in a protective case.
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3.6.1 Interfaces
DIAG
A
A
B
1
5
V
2
4
5 6 7 8
3
1
2:
View of ET250 interfaces
(1) Recovery key
(2) Power supply port (15 V DC)
(3) Status LED
(4) OBD connection cable port
(5) Network port (LAN 10/100 Mbit)
(6) USB 2.0 A port (1x)
(7) WLAN USB adapter (WLAN 802.11 b/g/n)
(8) USB 2.0 B port (1x)
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3.6.2 Network port
The network port serves to provide a stable internet
connection in locations where a WLAN connection can-
not be reliably maintained due to interference.
The network port can be used during initial com-
missioning and for software updates.
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3.6.3 Storage battery
The storage battery is permanently integrated into the
housing and cannot be changed from the outside.
The fully charged storage battery of the ET250 is de-
signed to guarantee approx. 2 hours of independent op-
eration.
The ET250 can be operated with the following voltage
supply:
• Storage battery
• Power supply unit
• OBD connection cable
With the OBD connection cable plugged in, the
ET250 is supplied with power by the vehicle and
recharged.
Charge the storage battery for at least 2 hours
before using the ET250 in battery mode.
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3.6.4 Operating system
The ET250 runs a closed operating system developed
on the basis of AOSP (Android Open Source Project). It
is not possible to install third-party software or apps
(e.g. from the Google Play Store).
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3.6.5 Status LED
The status LED on the back of the housing indicates
various statuses of the ET250:
LED off
ET250 not switched on.
LED flashes green 1 time per second
Normal operation. ET250 starting or already active (al-
so in power-saving mode).
LED flashes green every 5 seconds
ET250 is switched off and being charged.
LED flashes yellow 1 time per second
Internal communication failure.
Ausschalten erzwingen
LED flashes red 1 time per second
ET250 switched on and supplied with power, but the
system does not start (Recovery Mode).
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4. Initial Operation
4.1 Setting up the ET250
Before initial commissioning, make sure the volt-
age supply matches the voltage rating of the pow-
er supply unit provided.
The ET250 supports WLAN frequencies in the 2.4-
GHz range of channels 1 (2412 MHz) to 11
(2462 MHz). WLAN computer networks outside
the frequency range are not displayed.
The WLAN configuration always depends on the
configuration of the router / access point availa-
ble.
The "Extended Range" function is not supported.
Initial Operation | ET250 | 7 | en
