TEL AFA4000/E - Page 190

AFA4000/E VAV Airflow Controller / p.190
Problem
Check for
• Tx & Rx >0 but fixed values. The AFA4000 has lost connection
to the network.
• Rx is counting but Tx is a fixed value. The AFA4000 is
connected to the network but the Master is offline or not
polling the AFA4000.
13.1.2 RS485 comms
Problem
Check for
BACnet:
Device not present on
Network
• Ensure the AFA4000/E is in Run mode or Diagnostics screen.
The comms are interrupted when the AFA4000 is in the
pushbutton menus.
• Power cycle the AFA4000. This is required when the protocol
has been changed.
• Ensure Max Masters is set to the number of devices on the
network. When the value set is larger than the actual number
of devices the comms will be slowed and may cause time out
issues.
• Ensure the network is BACnet MS/TP not BACnet IP - a
separate router is required for IP.
• Check the comms settings are correct in the Diagnostics menu
(section 13.2).
Modbus:
Device not present on
Network
• Ensure the AFA4000/E is in Run mode or Diagnostics screen.
The comms are interrupted when the AFA4000 is in the
pushbutton menus.
• Power cycle the AFA4000. This is required when the protocol
has been changed.
• Ensure the network is Modbus RTU.
• Check the comms settings are correct in the Diagnostics menu
(section 13.2).