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Enable RS-232 port: When this option is off, it powers
„
down. When it is on, it powers up the RS-232 hardware. It
then displays the assigned COM port number.
Note: If you do not have a device plugged into the RS-
232 port, the port pins corrode more quickly when left
powered up. Use the setting to power down when it is not
going to be used.
Configure pin 9 as input or 5 volt 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 5 Volt Power Supply 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 is either 5 or 12 VDC.
The 12 VDC output option on RS-232 is always on and not
controlled by settings.
Chapter 3 Optional Features and Accessories
29
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