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Note that the modem lines are designed to work with UARTs, so the states
are inverted. This means that the lines are at V CC when off and at ground
when on.
The RS-232 Area
The RS-232 area contains a RS-232 level converter that, when used
with the QS Series module, creates a USB-to-RS-232 converter. All of
the modem lines are provided to allow for full handshaking, and power
is provided by the USB bus. To use, simply plug the USB cable from the
PC into the jack, a straight-through serial cable from the PC into the DB9
connector, place the jumper in the breakout header between “Data In” and
“Data 232”, and you may now run the software.
The development software is designed so that testing can be done with
a single PC by sending data through the USB bus and receiving it back
through the serial port and vice versa. This section can also be used to
interface the PC with any RS-232 device. Custom software can be written
to control the device directly, or the Virtual COM Port drivers can be used
to make the USB module look like an additional serial port so that existing
software can be used.
Figure 7: RS-232 Section
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