dSPACE DS1103, Hardware Installation And Configuration Manual

Page: 186 / 302

You can leave the IDX and IDX pins unconnected if your encoder does
not provide an index signal. In this case, you cannot use RTLib
functions or RTI blocks that require an index signal.
Encoder without index
signal
Supplying Power to Encoders
The DS1103 offers three power supply outputs (VCC pins). You
should use these supply voltages for all connected incremental
encoders.
Connect all VCC pins so that the current is shared evenly by all pins.
Use wires of sufficient diameter to avoid voltage drops. This does not
apply if you use connector panels to connect your encoder(s) to the
board since the VCC pins are internally connected at the connector
panels.
For more details on the VCC outputs, refer to
Power Supply Outputs
on page 162.
Using power from the
DS1103
If the encoder’s supply requirements cannot be met by the DS1103,
an external supply voltage must be used. In this case:
n
You have to guarantee that no input voltages are fed to the
DS1103 while it is switched off
n
You have to connect the encoder’s ground line to a ground pin of
the board (see example below)
Using an external power
supply
Incremental encoder DS1103
GND
External
VSupply
VSupply
GND
VCC
s
Signal Connection to External Devices
t
186
s
DS1103 Hardware Installation and Configuration November 2014