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Multi-4C/PCI VA3
4. PORTx PWR: voltage supply selection jumper
(PORT1 is Port #1~ PORT4 is Port #4)
+5V: supply 5V voltage to peripheral using 9th.pin.
+12V: supply 12V voltage to peripheral using 9th.pin.
RI: Enables RI communication when using RS232. not supply any peripheral.