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4. Connectors
4.1 Serial Interface Connector P1
The following diagram shows the connection of the 9-pin D-Sub female connector P1 which is used for the
serial interfaces.
GND DTR RXD TXD
5 o
o
o
9
CTS
TXD is the transmit output, RXD is the receive input. The DTR signal is used as an input ,which can be
connected to generate a reset.
Note : CTS and RTS must be connected to each other because of the serial monitor debugger
communication protocol – if you have problems with the monitor communication, please check if
these two signals are connected to each other !
4.2 Power Connector J1
The following figure shows the power connection jack J1. This connector is used to connect an external
regulated DC power supply voltage (7.5V-12V DC) to the evaluation board. It is recommended to use 7.5V
to keep the power dissipation to a minimum. Otherwise an additional heat sink for the linear voltage
regulator might be necessary.
4.3 CAN Interface Connector
The following diagram shows the connection of the 9-pin D-Sub male connector P2 which is used for the
.
CAN interface
5 o
o
o
9
For the CAN interface the resistor trimmer R18 is used to adjust the slew rate. Take care that the slew rate
is adjusted according to the local environment (CAN network configuration, transfer rate)
NC
o
o
o
o
o
o
8
7
6
RTS
DSR
Shield is connected to positive voltage supply (+)
Centre is connected to ground (GND)
CANL
o
o
o
o
o
o
CANH
6
1
1
11
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