3.1. Operation: External User I/O

_images/connector-db15.svg

Fig. 3.4 BDx Module D-Sub 15-pin BDx Interface user I/O connector (female) pin numbering

Table 3.1 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

5

INTERLOCK

Digital Output

Indication that the product is operating normally, typically to be integrated into digital interlock +5V inputs on MagnaDC power supplies

6

ENABLE

Digital Input

Engages the cooling fans and enables the product when driven to +5V, typically connected to the power status output on MagnaDC power supplies via the provided Interface Cable

7

GROUND

Ground

Ground to be used as digital input-output reference

3.1.1. Digital Outputs

The BDx Module has digital output and digital input signals on its rear 15-pin D-Sub external user I/O. The External User I/O pin layout is defined in BDx Module D-Sub 15-pin BDx Interface user I/O connector (female) pin numbering.

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

When the BDx Module is in a normal operating state, INTERLOCK (Pin 5) will output +5V with respect to GROUND (Pin 7).

When the BDx Module is in a faulted state, INTERLOCK (Pin 5) will output 0V.

INTERLOCK (Pin 5) is often used to tie in to existing interlock systems and is provided with an ORing diode for protection.

3.1.2. Digital Inputs

The digital inputs are used to control the Accessory’s operating state. Digital input pins are driven with +5V to activate the associated function and 0V to deactivate it, referenced to GROUND (Pin 7).

ENABLE (Pin 6) engages the Accessory’s cooling fans and enables the product. When ENABLE (Pin 6) is driven with +5V with respect to GROUND (Pin 7), the cooling fans engage. When ENABLE (Pin 6) is at 0V, the Accessory is disabled and the cooling fans do not run.

When the BDx Module is integrated with a MagnaDC programmable DC power supply using the provided Interface Cable, ENABLE (Pin 6) is driven automatically by the power supply’s power status output: the cooling fans engage whenever the power supply is powered on, requiring no user action. See Interface Cable for connection details.

When the BDx Module is operated without a MagnaDC power supply and the provided Interface Cable, the user must drive ENABLE (Pin 6) with +5V with respect to GROUND (Pin 7) to engage the cooling fans before conducting current through the Accessory.

Warning

FIRE HAZARD. The BDx Module cooling fans only operate while ENABLE (Pin 6) is driven with +5V. Conducting current through the Accessory without +5V applied to ENABLE (Pin 6) could result in overheating and catastrophic failure of the BDx Module.

3.1.3. Grounds

A ground pin is provided on the BDx Module 15-pin external user I/O connector on Pin 7 to be used as the reference ground for digital inputs and outputs.