The HelixNet HMS-4x base station has four relays that can be accessed via the rear panel DB-25 connector, these relays can be programmed via the front panel menu button / rotary controls associated with the LCD displays.  These relays can be activated via the base station call 1 - 4 buttons and the talk 1 - 4 buttons.  To program the relays follow the instructions below:
To configure the Control I/O for Relay outputs:
1. In Menu mode, select Control I/O.
2. From the second menu (second display screen), select Outputs.
3. From the third menu (third display screen), select one of the four available Relay outputs:
• Relay 1
• Relay 2
• Relay 3
• Relay 4
4. From the fourth menu (fourth display screen), select one of the following:
• None
• Call Key 1
• Talk Key 1
• Call Key 2
• Talk Key 2
• Call Key 3
• Talk Key 3
• Call Key 4
• Talk Key 4
5. To enable (confirm) the selected setting, press the rotary control.