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Getting started
Table 13: CAN baud rate and corresponding maximum
bus length
CAN baud rate
800 kbit/s
500 kbit/s
250 kbit/s
125 kbit/s
50 kbit/s
CAN baud rates
4.2.3 CAN bus termination
In any bus system, signal re ections at the end of a
wire or cable can cause interference which can in turn
cause transmission errors. To minimize these re ections,
place a terminator at each end of transmission lines.
The terminating resistance between CAN-High and
CAN-Low must match the characteristic impedance of the
transmission lines.
In CAN bus networks, normally unshielded, twisted cable
pairs are used for signal transmission. The characteristic
impedance of the transmission lines is roughly 120 . The
terminator between CAN-High and CAN-Low must be 120 .
4.2.4 Mobile radio and GNSS antenna
The TFX External Antenna model variant features external
antenna ports for mobile radio and GNSS signals.
The antenna ANT LTE GNSS DA 3M0 FAKRA-D FAKRA-C FA
(part number 102EC99111A) features a port for mobile radio
signals (FAKRA-D) and a port for GNSS signals (FAKRA-C).
!
Danger of explosion due to the operation of electrical
equipment in potentially explosive atmospheres.
Severe injury or death.
Observe the applicable regulations and precautions for
•
potentially explosive areas.
Do not mount the antenna in the close proximity of easily
•
ignited substances (e.g. fuel tanks) and insu ciently
shielded electronic devices.
CAUTION!
!
Health hazards of radio-frequency energy
Slight or medium injury.
Make sure the device is switched o during installation.
•
During operation, observe a distance of at least 20 cm
•
between the antennas and personnel.
Do not store or operate antennas together with other
•
antennas or transmitters.
14
TFX INSTALLATION AND OPERATION MANUAL
Maximum bus length
50 m
100 m
250 m
500 m
1,000 m
DANGER
MOBILE RADIO CONNECTOR
Connect the antenna's FAKRA-D plug (violet) to the device's
FAKRA-D port (violet).
NOTICE
Property damage
The device or antenna could be damaged.
Only use antennas with a maximum gain as speci ed in
•
the technical data. See chapter Technical data.
GNSS CONNECTOR
Connect the antenna's FAKRA-C plug (blue) to the device's
FAKRA-C port (blue).
NOTICE
Property damage
The device or antenna could be damaged.
Only use active GNSS antennas with LNA, gain max. 25
•
dBi, voltage 3.3 VDC, current max. 30 mA.
INFORMATION
Mount the GNSS antenna so that it is level with the horizon
and has full view of the sky above.
4.2.5 Switching the device on/o
The device does not have an on/o switch.
To switch it on, connect the device to an active
power supply.
To switch it o , disconnect it from the active power supply.
NOTICE
Device defect due to power failure.
Destroyed le system on the device. Repair by
Danfoss necessary.
Permanently connect terminal 30 to permanent positive
•
plus (vehicle battery) to ensure the device switches
o correctly.
Connect terminal 15 correctly and con gure safe
•
shutdown in the "Power Management" eld of the
device con guration.
Do not disconnect the device from the power supply until
•
all active processes have been completed.
6046279-001
March 2020
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