Honeywell HC900 Installation And User Manual page 23

Introduction - Feature Summary
Redundancy
•
Supervisory Network – Ethernet 10/100 baseT to PC Applications (HC Designer & HC Utilities),
communicates to peer HC900 Controllers over Ethernet. C75 has two Ethernet ports. Lead C75 CPU
supports up to 10 concurrent sockets. It also supports Modbus/TCP Initiator function over both ports.
•
I/O Network – Direct connection to each C75 CPU.
•
Device Network
−
RS-232 or RS-485 Serial Interface; Modbus RTU. Two serial ports available for legacy systems.
Each port can be set as Modbus Master or Slave. Host Serial Interface for Honeywell or third party
operator interface.
−
For new systems two serial R2-485 ports are available. Each port can be set as Modbus Master or
Slave. Host Serial Interface for Honeywell or third party operator interface.
For more information
For complete feature summary and specifications see Specifications on page 194.
Revision 19
06/14
HC900 Process Controller Installation and User Guide 11