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© 2022 All rights reserved. Data subject to change without notice.
57
Rev. C | 2022.02
FCS - Operation Manual
The FCS can be configured for the following baud rates:
• 9,600 (LAN Modbus® for AST-IS18-M)
• 14,400
• 19,200 (LAN / WAN Modbus® factory default)
• 38,400
• 57,600
• 76,800 (WAN BACnet® factory default)
• 115,200
There are two networks on the FCS. The first is the local area Modbus
®
RS-485 RTU
network (LAN) used for communications with connected CETCI digital transmitters and
peripheral devices.
FCS default LAN Modbus® communications parameters:
• Baud rate =19,200
• BUS Controller is the FCS
• Parity = no parity
• Stop bits = 1
• Data bits = 8
NOTE:
The FCS has been designed to operate with these parameters and any changes
made could affect its ability to work as intended. If these values are changed, CETCI will not
troubleshoot the system for communication faults until they are returned to factory defaults.
The second network is the wide area Modbus® or BACnet® network (WAN) used for
communications with building automation systems.
FCS default WAN Modbus® RTU (version 1.1b3), RS-485 communications parameters:
• Baud rate =19,200
• BUS Controller is the BAS/DDC
• Modbus
®
ID of FCS = 100
• Parity = no parity
• Stop bits = 1
• Data bits = 8
NOTE:
It is the customer’s responsibility to supply the correct wiring for the communication
back to their BAS. The baud rate and Modbus® ID can be changed to match the BAS system.