CHAPTER 3. TECHNICAL DESCRIPTION
GÖPEL electronic GmbH
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if you have any questions about the firmware variants.
3.8.1 CAN/ CAN FD
The
Multibus Controller 6281
supports a total of eight CAN/ CAN FD interfaces.
For CAN and CAN FD the same transceiver is used:
•
TJA1044GT
The following specifications apply to the transceiver:
Table 3.14: Electrical characteristics for CAN/ CAN FD
Symbol
Parameter
Min.
Typ.
Max.
Unit
Comment
C
Transfer rate
5
MBit/s
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
27
V
R
CAN
Termination resistance
120
Ω
switchable
The CAN interface is generally supplied with an
internal 12 V voltage
(VBAT
int
).
If other voltage levels
are used, the internal voltage can be switched off individually by software with the
G-API
command
G_Can_Node_ InternalVBat_Disable
.
In this case, the external voltage (VBAT
ext
) must be fed via the
predefined pins on the front connector. With
G_Can_Node_InternalVBat_Enable
the internal supply is
switched on again.
The
120
Ω
bus terminating resistor
of the transceiver can be deactivated by software with the
G-API
command
G_Can_Node_BusTermination_Disable
. With
G_Can_Node_BusTermination_Enable
the bus termination
resistor is reactivated.
3.8.2 LIN/ K-Line
The
Multibus Controller 6281
supports a total of eight LIN/ K-Line interfaces.
For LIN the following transceiver is used:
•
TJA1020
The following specifications apply to the transceiver:
Table 3.15: Electrical characteristics for LIN
Symbol
Parameter
Min.
Typ.
Max.
Unit
Comment
Transfer rate
19.2
kBit/s
VBAT
int
Internal battery voltage
12
V
switchable
VBAT
ext
External battery voltage
12
27
V
R
LIN
Pull up resistance
1
30
k
Ω
switchable for Master (1k)/ Slave (30k)
The LIN interface is generally supplied with an
internal 12 V voltage
(VBAT
int
). If other voltage levels are
used, the internal voltage of all LIN interfaces can be controlled by software with the
G-API
command
G PCIe / G PXIe / G CAR 6281
20
