The modified graphic of the control board above identifies locations where users may connect outputs that provide additional alarm communications abilities or inputs from external equipment and/or sensors. These are described below:
| NAME | DESCRIPTION |
|---|---|
| COMMON ALARM 1 | When HH LED is in alarm state (RED), this alarm relay activates. |
| Output is typically connected to a substation control room to communicate alarm condition, or similar application. | |
| COMMON ALARM 2 | When HH LED is in alarm state (RED), this alarm relay activates. |
| Output is typically connected to a battery charger which often has more advanced alarm communication functions such as remote communications, or similar application. | |
| INPUT 1 | User-customizable alarm input that will activate Hindle Health RED LED on door. |
| Often used for over-temperature alarm from AC or heating failure. | |
| INPUT 2 | User-customizable alarm input that will activate Hindle Health RED LED on door. |
| Often used for under-temperature alarm from heating failure. | |
| INPUT 3 | User-customizable alarm input that will activate Hindle Health RED LED on door. |
| Often used with hydrogen detector to indicate 2% hydrogen concentration in environment. | |
| INPUT 4 | User-customizable alarm input that will activate Hindle Health RED LED on door. |
| Often used with hydrogen detector to indicate 1% hydrogen concentration in environment. If LINK4 dip switch in SW-3 is set to ON, then Input 4 will be linked to FAN, causing fan to run when 1% hydrogen exists. |