Honeywell CIU 888 Configuration Manual page 209

Part No.: 4417584_Rev12
Appendix C - Redundancy
3. Under the Port tab, choose LANVendor from the Port Type drop-
down list and Modbus TCP from the Network Type drop-down list.
4. Under the Redundant Port tab, choose RedundantLANVendor
from the Port Type drop-down list and Modbus TCP from the
Network Type drop-down list.
Configuration Manual
CIU 888 C - 23