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Digi One EM Hardware Reference 13
Chapter 3
About the Development Board
Overview
The development board provides the following interfaces:
• A DB-9 serial interface that enables serial connections
from your device to the Digi One EM module. See "DB-9
Serial Interface (P1)" on page 15.
• A 12-position socket to supply both power and ground to
the Digi One EM.
• A reset switch to reboot the Digi One EM. See "Reset
Switch (SW1)" on page 16.
• A standard 2.0 mm jack that accepts 5 volts DC +/- 5%
from a regulated power supply. See "Power Jack (P7)" on
page 17.
• Eight LEDs. One (labeled CR4) tells you if the power is
on. The other seven (labeled CR5 - CR11) are active
when EIA-232 signals are detected. See "LEDs (CR4 -
CR11)" on page 18.
• A reserved 3-pin header (labeled P5)
Cautions
• Although the Digi One EM can handle up to 9 VDC, this
voltage can harm the development board, which works
only with the 5 volt regulated power supply. The board
does not regulate power.
• To guard against damage to the development board due
to electrostatic discharge (ESD), do not remove it from its
protective packaging until you have been properly
grounded. To ground yourself, put the wrist strap on
(included in the package) and then attach the clip to a
metal surface.