6. SPECIFICATION OF INPUTS AND OUTPUTS
6.11 CAN interface
6.11.1 Pinout
Connector Pin no. Note Function
C1 13 1 CAN Interface 0 – High Line
C1 5 1 CAN Interface 0 – Low Line
C1 12 1 CAN Interface 1 – High Line
C1 4 1 CAN Interface 1 – Low Line
C1 11 1, 3 CAN Interface 2 – High Line
C1 3 1, 3 CAN Interface 2 – Low Line
C1 24 1, 2, 3 CAN Interface 3 – High Line – ISOBUS
C1 32 1, 2, 3 CAN Interface 3 – Low Line – ISOBUS
Note 1 According to ISO 11898
Note 2 According to ISO 11783
Note 3 Only for Vision 312Plus products
6.11.2 Functional description
CAN implements a bidirectional twisted pair bus for high speed serial data transfer up to 1 Mbit/s. The
bus must be terminated with 120 Ω at each end to prevent wave reflection. If the Vision 312 device is
connected at the end of a CAN bus, it is necessary to use external termination resistors as the device is
not equipped with internal termination. See figure 8 below for details.
Note that a common ground (chassis) or a proper ground connection is necessary for CAN operation.
When connecting with an external device (for example, a PC with CAN interface for downloading soft-
ware), make sure that the maximum voltage ratings are not violated when connecting to or disconnecting
from the CAN bus.
The CAN interface is fully ISO 11898-2/-5 compliant.
6.11.3 CAN 3
Due to the requirements of the ISOBUS standard [3], the internal protection circuit of CAN 3 differs from
the other CAN interfaces of the device. To achieve good RF immunity, it is recommended to use CAN 3
with external termination. It is recommended to implement the termination based on the equivalent circuit
shown in figure 9 below.
© TTControl GmbH 2020. All rights reserved.
Confidential and Proprietary Information
26
Document Number:
D-156-G-02-001
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