User guide

In This Chapter
Chapter 18 Configuring Power Over the Serial Ports 80
Chapter 18 Configuring Power Over the Serial Ports
In This Chapter
Serial Power Feature..............................................................................................................................................80
Configuring RI Power............................................................................................................................................81
Configuring DTR Power........................................................................................................................................81
Serial Power Table.................................................................................................................................................82
Serial Power Feature
The Serial Power feature available for the Digi One TS, PortServer TS 2 MEI, and PortServer TS 4 MEI allows
the Digi device to power a serial device (power out) or use a serial device to power the Digi device (power in).
The advantage of this feature is to eliminate an external power supply.
Power out is available on all ports through Ring Indicator (RI) or Data Terminal Ready (DTR). Power in is
available only through RI and only on port one (1). The Serial Power feature is active on a specific port when
that port is configured for RS 232 operation.
The power out budget equals one (1) watt (the total amount of power available). The available power can be
divided in any combination between the ports but the following rules must be observed:
— RI = 5 volts @ up to 200 mA (max)
— DTR = 9 volts @ up to 100 mA (max)
— You may use DTR or RI as the source of power (power out) on any port but you may not use both DTR and RI on the same port.
• Pinout information
— RI is pin 1
—DTR is pin 9
• RI signaling is lost when the pin is used for power