7. Operation: External User I/O

Fig. 7.1 BDx Module D-Sub 15-pin BDx Interface user I/O connector (female) pin numbering

Table 7.1 Complete pin listing and definitions available on the BDx Module D-Sub 15-pin external user I/O connector. Pins not listed have no connection.

User I/O Pin	Definition	Signal Type	Description
1	GROUND	Ground	Ground to be used as digital input-output reference
2	FAULT	Digital Output	Indication that the product is in a faulted state.
3	INTERLOCK	Digital Output	Indication that the product is operating normally, typically to be integrated into digital interlock +5V inputs on MagnaDC power supplies

7.1. Digital Outputs

The BDx Module has eight digital output signals on its rear 15-pint D-Sub external user I/O. The External User I/O pin layout is defined in Operation: External User I/O.

The digital outputs are used to monitor the Accessory’s internal states. A pin will output +5V when a state is active and 0V when a state is inactive. The maximum output current per pin is 20 mA.

When the BDx Module is in a normal operating state, FAULT (Pin 2) will show 0V and INTERLOCK (Pin 3) will show 5V, both with respect to GROUND (Pin 1).

When the BDx Module is in a faulted state, FAULT (Pin 2) will show +5V and INTERLOCK (Pin 3) will show 0V.

INTERLOCK (Pin 3) is often used to tie in to existing interlock systems and is provided with an ORing diode for protection.

7.2. Grounds

A ground pin is provided on the BDx Module 15-pin external user I/O connector on Pin 1 to be used as the reference ground for digital outputs.