Honeywell HC900 User Manual

Components and Architecture - Serial Ports (RS-232 and RS-485 for legacy systems and two RS-485 ports for new
systems)
Revision 19 HC900 Process Controller Installation and User Guide 35
06/14
Serial Ports (RS-232 and RS-485 for legacy systems and two RS-485
ports for new systems)
Overview
Figure 22 – Controller Serial Ports
• S1 default setting is RS-232; S2 default setting is RS-485. Each port can be set to RS-232 or RS-485 (see
page 36). For RS-232 cable connections see page 124. For RS-485 connections see page 142.
• For new systems, either of two ports S1 and S2 can be configured as RS-485.
• Ports configurable as ELN (default) or Modbus RTU.
• Controller can act as Modbus master or slave through either port.
• Controller can be slave to masters such as
− Honeywell Operator Interface (1040, 559). Must be on RS-485 port S2. Will not work on port S1
even if set to RS-485. Will not work on port S1.
− Honeywell HC Designer PC software
− Third party PC HMI software
− Third party Operator Interface
• Controller can master to slaves such as
− Any Honeywell Modbus device (e.g., recorders, controllers, flame safety)
− Any non-Honeywell Modbus device.
• Only one master port at a time; can’t have RS-232 and RS-485 both as master ports.
• Modbus master ports default to slave ports, ELN protocol when CPUs are in Program mode.
• Baud rates to 57,600

Honeywell HC900 Specifications

General

Series	HC900
Redundancy	Optional
Programming Language	Function Block Diagram, Ladder Logic, Structured Text
Inputs	Analog, Digital
Outputs	Analog, Digital, Relay
Display	Optional
Control	PID, Advanced Control
Power Supply	24V DC or 100-240V AC
Storage Temperature	-40°C to 85°C
Humidity	5% to 95% non-condensing
Communication Protocols	Modbus, Ethernet