38 Mesa 3 Rugged Tablet Owner’s Manual
experiences communication failures when tablet enters
or exits sleep mode, then do not use this option.
Congure 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 off until the user application opens
the COM port and asserts the DTR signal. When the DTR
signal de-asserts, the power supply turns off again.
Check Disable power supply during sleep to cause the
power supply to automatically turn off when the tablet
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 Mesa 3 enters or exits sleep mode, then leave
this option unchecked.
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