450External Controllers
© Tibbo Technology Inc.
Pin 9 of the DB9M connector can also be used to provide "12VDC" power to an
attached serial device. Many small serial devices, such as barcode scanners, accept
power on pin 9 of their DB9 connectors.
We intentionally printed "12VDC" in quotation marks. This is because there is no
guarantee that the output voltage will be exactly 12V. It will actually be the "input
voltage minus the voltage drop across the diode". In plain words, it will be slightly
below the input voltage. If you connect 12V to the power jack you will get around
11.7V out of pin 9.
To turn the power switch on from within your Tibbo BASIC/C application, enable
(configure as output) the PL_IO_NUM8_PWROUT GPIO line and then set this line to
LOW. Additional programming information can be found in TIDE, TiOS, Tibbo BASIC,
and Tibbo C Manual (see i.o object and the DS1101 platform documentation).
Note that the DS110x devices cannot accommodate the PoE and Wi-Fi options at
the same time.
DS1102
The DS1102 can be powered through its power jack or the optional PoE module
(letter "P" in the model numbering scheme).
The PoE module is supposed to be powered by 48V (nominal), which is standard for
PoE equipment. Your PoE-enabled hub will take care of this. The PoE module outputs
12VDC.
Internally, both power sources are connected to the DS1102's power regulator
through two diodes, as shown on the diagram below.
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