Components and Architecture - Serial Ports (RS232 and RS485)
Revision 5 HC900 Hybrid Controller Installation and User Guide 19
9/03
Serial Ports (RS232 and RS485)
Overview
• Ports configurable as ELN, Modbus RTU or Modbus TCP protocol.
• Controller can act as Modbus master or slave through either port.
• Controller can be master to slaves such as
− Honeywell Operator Interface (1040, 559). Must be on 485 port. Will not work on 232 port with
232/485 converter.
− Honeywell HC Designer PC software
− Third party PC HMI software
− Third party Operator Interface
• Controller can slave to masters 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 RS232 and RS485 both as master ports.
• For multiple slaves on RS232 port, a 232-to-485 converter is required.
• Baud rates to 57,600
Table 2 shows the ways the two ports can be configured simultaneously.
Table 2 Simultaneous serial port configurations
See RS232 Port Configured as RS485 Port configured as
Figure 16 #1 ELN device* ELN device*
Figure 16 #2 Controller is Modbus Slave ELN device*
Figure 16 #6 Controller is one of multiple Modbus slaves** ELN device*
Figure 16 #3 ELN device* Controller is Modbus Slave
Figure 16 #4 Controller is Modbus Master to single slave ELN device*
Figure 16 #5
Controller is Modbus master to multiple
slaves**
ELN device*
Figure 17 #7 Controller is Modbus slave
Controller is Modbus master to multiple
slaves
Figure 17 #8
Controller is Modbus master to multiple
slaves
Controller is Modbus slave
Figure 17 #9 Controller is Modbus slave Controller is Modbus slave
Figure 17 #10 ELN device*
Controller is Modbus master to multiple
slaves
Figure 17 #11 Controller is Modbus slave via modem ELN device*
*Such as Honeywell HCDesigner configuration software running on a PC or Honeywell 1040/559 Operator Interface
**Requires RS232-RS485 converter
