Nortech Systems XSYS, XUSR, RS-232/TERM, RS-422/485 Illumination Upper LED Link Lower LED OK SF

sDIO Digital I/O Signals

Table A-3. sDIO Chassis LEDs

Illumination	Upper LED (LINK)	Lower LED (OK SF)
None	No IEEE 1394 link	Local software not running
Blinking Green	Not Applicable	Local software active, not
		configured in V+
Solid Green	IEEE 1394 link good	Local software active, and
		configured in V+
Blinking Red	Not Applicable	Output fault
Solid Red	Not Applicable	Output fault

A diagnostic software indicator is not available for the XDIO outputs. In a short circuit condition, the XDIO outputs will simply fold back, supplying the maximum short circuit current to the output pin.

sDIO Output Power Supply Current Selection

The nine power pins for each group are connected together on the sDIO module’s board, and the current supplied from the output pins is drawn from these power pins. The number of power pins used in a particular application depends on the total current supplied through that group’s outputs. A total of nine power pins are provided to allow for more wire connections to decrease the voltage drop across the power supply wires.

The supply current should be limited to a maximum of one amp per power pin. Use this limitation to select the number of power pins you need.

For example, each output can source up to 700 mA, giving a maximum total current (for a group of eight outputs) of 5.6A that will be required from the power supply. In this case, a minimum of six power pins should be used. If you experience an excessive voltage drop, make connections to additional power pins (to a maximum of nine).

The ground connection should connect to the power supply directly, not the ground connection of the load. This will isolate the board from any voltage drop across the ground return for the load.

Adept SmartController User’s Guide, Rev. E 107