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Configuring DTR Power
Note Here are the pins to
verify the jumper
position. The default
position has the
jumper on the two pins
furthest from the edge.
DO NOT MOVE THE
JUMPER FROM THE
DEFAULT UNLESS
USING RI POWER IN.
76
2. Close the device unit enclosure.
RI Power Out
Ring Indicator (RI) power out is available on all ports. The total power
budget for this feature is one (1) watt not to exceed 5 volts @ up to 200mA
on any single port. The following procedure assumes the unit will only be
used for RI power out.
1. Set the port DIP switches to the following places: switch 1 and 3 are up
and 2 and 4 are down (see "Serial Power Table" on page 77 for
illustration).
2. Enable the RI power through the web interface.
3. Connect power supply with the barrel-connector power supply provided
with the device or use powered Ethernet.
Note:
If the unit will be used with RI power in (port 1 only), set the jumper to the
following setting:
P-6 jumper on pins 1and 2
and do not use an external power source. Port 1 cannot be used for both
power in and power out.
Power Out
Data Terminal Ready (DTR) power out is the factory default on the Digi
device server. Total power budget for this feature is one watt not to exceed
9 volts @ up to 100mA to any single port.
1. Set the port DIP switches to EIA 232 (switch 1 is up, 2,3, and 4 are
down) to enable DTR power.
2. Open the port and set DTR high.
If you are having trouble with your unit after using the Power over port
feature, you may have tripped the circuit breaker in the unit. You can
identify this by the RI or DTR signal indicators found in the System
Information under Administration on the main menu in the web interface.
Click the port number using serial power. (Remember serial power out is
unavailable if the MEI settings are not 232.)
Under serial power will be a message if the breaker is tripped. Follow the
Chapter 18 Configuring Power Over the Serial Ports
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