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Installing the VM24 11
Jumper Configuration
The jumpers are used to configure the inputs for the I/O boards as sinking or
sourcing. Each socket has its own corresponding jumper, allowing each
board with inputs to be independently configured for sinking or sourcing.
Sinking Inputs: Position 3 (shown)
Jumps pull-up to V
i
(pin 3)
Sourcing Inputs: Position 1
Jumps pull-up to Ground (pin 1)
The default jumper position when shipped from the factory is position 3, as
shown below. The jumper positions only affect inputs on the VM24.
Jumper position does not affect the outputs. Jumper position is irrelevant
for SIM8-OUT boards.
JU1
1
JU2
1
JU3
1
Pin 3 = V
i
Pin 2 = Pull Up (connection to SIM socket)
Pin 1 = Ground
Figure 5: VM24 Jumpers