Jumper Description; Pgm1; Sda_E1/Scl_E1; Uext_Fpwr_E1 - OLIMEX MOD-IO2 User Manual

Extension board

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MOD-IO2 user's manual

4.6 Jumper description

Please note that almost all (except for PGM1 that is PTH) of the jumpers on the board are SMT type. If

you feel insecure in your soldering/cutting technique it is better not to try adjusting SMT jumpers.

Also if you feel incapable of removing the PTH jumper with hands better use tweezers.

PTH jumper required to change I2C address via software means. Used to restrict changing I2C address. If

you want to change I2C address you need to close it.

Default position is open.

Jumpers that connect or disconnect 4.7K pull-up resistors.

When you have more than one MOD-IO2 connected you need to keep those two jumpers closed, else the

I2C line will be disconnected.

The default positions for both jumpers are closed (pull-ups enabled).

If closed provides 3.3V at the female UEXT connector (but be careful since if you close that jumper and

also you close the male one on the next MOD-IO2 line this might cause short-circuit and damage the

board).

Default position is open.

If closed provides 3.3V at the male UEXT connector (but be careful since if you close that jumper and

also you close the female one on the next MOD-IO2 line this might cause short-circuit and damage the

board).

The default position is open.

The components below are mounted on MOD-IO2 but are not discussed above. They are listed here for

completeness:

Relay LEDs + Power LED

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