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- I2C based communication bus
- Ability to gang 4 units on one bus
- I2C Address range 0x20-0x27, with pairs of addresses being allocated on each board. Addresses are jumper selectable
- 16 IO ports available and can be programmed at bit level for input or output
- Current limit resistors are placed on each output and a shorting bus wire on inputs
- 5VDC operation
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