Chapter 3 Optional Features and Accessories 23
Configure pin 9 as input or power supply: Pin 9 is the Ring-
In signal input. It is rarely used by devices anymore and has
become a popular pin to provide a power source to an RS-232
device.
Select Input if your device uses Ring-In signal or if it does not
need to be powered from the RS-232 port.
Select Power supply enabled to make pin 9 a power supply to
be used by the RS-232 device. The power supply is enabled
automatically without needing any interaction with the COM port.
Depending on the model, the power supply supplies either 5
VDC or 12 VDC.
Select DTR enables power supply to make pin 9 a power supply
(5 VDC or 12 VDC depending on model). The power supply
remains o until the user application opens the COM port and
asserts the DTR signal. When the DTR signal de-asserts, the
power supply turns o again.
Check Disable power supply during sleep to cause the power
supply to automatically turn o when the FC-6000 is in sleep
mode. This can allow the RS-232 device to conserve battery
power in sleep mode. If your app and/or RS-232 device
experiences communication failures when the FC-6000 enters or
exits sleep mode, then leave this option unchecked.
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