OLIMEX© 2020
MOD-IO user's manual
5.5 UEXT_MALE
This connector is usually used for the I2C communication with the host board (the more powerful board
that uses the MOD-IO). Additional 10-pin female-female cables might be purchased from our web-shop:
https://www.olimex.com/Products/Components/Cables/CABLE-IDC10-15cm/
Pin #
Signal Name
1
NC
2
GND
3
RXD
4
TXD
5
SCL
6
SDA
7
MISO
8
MOSI
9
SCK
10
#SS
5.6 UEXT_FEMALE
The UEXT female connector is not typical for the OLIMEX boards. It allows multiple MOD-IO boards to
be connected to each other even without the need of a cable! Just plug the UEXT_FEMALE of board 1 to
the UEXT_MALE of board 2. You can have as many boards as you want as long as each of them has
unique identifier for the I2C communication.
Pin #
Signal Name
1
NC
2
GND
3
RXD
4
TXD
5
SCL
6
SDA
7
MISO
8
MOSI
9
SCK
10
#SS
5.7 Digital inputs, digital outputs and analog inputs
The board is equipped with connectors for analog input. It has opto-isolators on the digital input lines. It
also has relays on the digital outputs.
All of the inputs and outputs can be controlled and monitored by the default firmware of the board
sending and receiving commands over the I2C line located on the UEXT connector.
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