Required configuration steps for York RTUs to ensure proper BACnet MS/TP communication and control with EMS platforms (ex: GPEC / GEM).

BACnet Configuration Steps

•  Access the RTU controller via onboard display inside the unit
• Navigate to: MENU - COMMUNICATIONS - BAS / PROTOCOL
• Set Protocol to BACnet MS/TP
• Set Baud Rate to 19200 (use 38400 only if required)
• Assign unique MAC Address (recommended: 5–9 if controller is 4)
• Set BACnet Device Instance (must be unique across network)
• Save configuration and exit menu
• Power cycle unit
• Access onboard York controller again to verify settings were retained

MS/TP Wiring Requirements

• Use daisy chain protocol
• Maintain wiring polarity through whole trunk
• Install 120-ohm termination resistor at first and last device
• Ensure consistent baud rate across all devices (19200 or 38400)
• Avoid duplicate MAC addresses or Device IDs

Integration Notes (GPEC / GEM)

• Recommended addressing: GPEC = 4, RTUs = 5–9
• Use BACnet_2 (RS485 Port #2)
• Ensure MAC Address and Device ID match GEM configuration
• Avoid BACnet_3 unless manually configured

Common Issue

• Intermittent comms: verify baud rate, EOL resistors, and addressing