7
Communication
3 Product description
Instruction book, IQAN-MD4
Communication
The communication interfaces are used for uploading/downloading applications,
connecting to expansion modules, connecting to cameras or diagnostics.
CAN related functions
The IQAN-MD4 uses a CAN-bus (CAN = Controller Area Network) to communicate
with IQAN expansion modules and other systems. The CAN-bus is a robust
communication protocol that is widely used and well proven within the automotive
industry.
The MD4 has up to four (4) CAN buses depending on model, CAN-A to CAN-D. The
CAN buses may be configured in IQANdesign to be used for IQAN expansion
modules, IQAN diagnostic and multi-master traffic, SAE J1939 modules (e.g. for
engine and transmission), or as Generic bus for user defined CAN protocol (suitable
also for CANopen).
IQAN diagnostics bus
The IQAN diagnostics bus is used for communication between master units in a multi-
master system, and also as a gateway to an IQAN-G11 or to a connected PC (requires
compatible USB to CAN adapter).
In the IQAN-MD4, the CAN channels are paired in groups of 2. There is CAN-A and
CAN-B, where the CAN controllers are in the main processor, compared to CAN-C
and CAN-D, that are controlled by the co-processor.
NOTICE
On the IQAN-MD4, the buses CAN-C and CAN-D have a lower throughput rate for
bursts of CAN traffic.
It is recommended to use CAN port A or B for diagnostics on the MD4 module,
especially in multi-master systems.
Ethernet
The MD4 has up to two Ethernet communication ports depending on configuration,
Port A (C3) and Port B (C4).
Port A is used for uploading/downloading applications and diagnostics and is
designated for computer communication. see Ethernet diagnostics communication for
more information.
Port B is used for in-vehicle network over Ethernet, for example communicating with
camera or other masters. see Video input for more information on how to use cameras.
HMI (human machine interface)
Display
Touch function
The IQAN-MD4 display has a capacitive touch screen (PCAP touch screen) enabling
the user to control the display with the use of fingers, passive stylus, thin gloves or
thicker gloves with conductive material in the finger tips. The touch sensor is protected
from wear behind a glass surface.
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