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)
36 HC900 Process Controller Installation and User Guide Revision 19
06/14
Setting serial ports S1 and S2 to RS-232 or RS-485
For legacy systems, S1serial port default setting is RS-232; S2 serial port default setting is RS-485. Each
port can be set to RS-232 or RS-485.
For new systems, the serial ports S1 and S2 are RS-485 unterminated.
Functionality is determined by DIP switch setting on, see the following figure. To change either port’s
setting, use the switch settings in Table 3. Use a small slotted screwdriver or paperclip to gently move the
DIP switches. If you push too hard you could damage the switches or nearby circuitry. Avoid using pencils
because the point could break and cause damage.
Table 3 – Serial port DIP switch settings
Figure 23 – Serial Ports DIP Switch default settings

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