Specifications

Digi m10 Hardware Reference v 1.20
Digi International, Inc. © 2013
Page 13 of 38
to the Digi m10
Note: The Dbg_Rx line (Pin 12) needs to be pulled high using a 10KΩ resistor to 3.3V on
the Host board even if Debug port is not used.
2.3 Power and Ground
The Digi m10 is powered using five pins of its 14-pin connector (see Table 4). The five mounting
pins on the shield of the Digi m10 are also connected to the ground plane of the Digi m10.
Table 4: Power Pins
Pin
Name
Description
1
VCC
Supply
2 GND Ground
3
VCC
Supply
4 GND Ground
6 GND Ground
2.4 Power Enable
The Power Enable signal is used to turn the Digi m10 ON or OFF. It is an active high logic-level
signal. The power enable signal can be from 3V min to 18V max. This will help users who do not
want separate PWR_EN functionality as they can tie PWR_EN to the Digi m10 supply voltage.
However, in this condition, the Digi m10 will be always be powered ON (consuming receive
current) unless the user cuts OFF Digi m10 power. This signal has to be maintained at an active
high level in order to keep the Digi m10 ON.
Table 5: Power Enable Pin
Pin
Name
Description
5 PWR_EN Digi m10 Power Enable
This line is pulled low using a 47KΩ resistor.
2.4.1 Powering Up
To power on the Digi m10, the host controller must provide an input voltage between 9 V and 18
V DC and then set the PWR_EN pin to active high. Typically, the Digi m10 will take five seconds
to be in a ready state. After powering on, the Digi m10 will toggle the DA pin once to let the host
controller know that it is ready to receive serial commands.
After the DA pin's initial toggle, its subsequent active high state indicates messages from the
satellite that are available in the Digi m10's inbound (IB) queue. The Digi m10's timing diagram for
powering up is shown in
Figure 4.