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APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
Select to bring up the following sub-menu.
3. Modbus Setup Parameters
Select to view and/or adjust COM port parameters as needed to communicate with an EMS.
Follow on screen instructions. COM 1 is used for communication between touch screen display and the boiler control
and does not require adjustment. COM 2 is used for communication between an EMS and the boiler control and may
require adjustment to suit the EMS.
Select System Menu >> System Setting >> COM Port to access the following parameters. To exit System Menu,
cycle power or select open blue area of screen.
COM Port COM 1 COM 2
COM Port Configure For
Control: communication between boiler display and
boiler control
EMS: communication between EMS and boiler
control
Control EMS
Port Type (non-adjustable) Modbus Master Modbus Slave
Special Notes
NOTICE: Do not change any of these settings.
Loss of communication to control could result.
Adjust these settings
to suit the EMS
COM Mode RS 485 RS 485
Baud Rate 38400 38400
Stop Bits 1 bit 1 bit
Data Bits 8 bit 8 bit
Parity Bits None None
Comm. Delay (ms) 10 ms 10 ms
Comm. Timeout (ms) 1000 ms 1000 ms
Comm. Retry Times 2 2
Comm. HMI Station
This is Modbus Slave Address.
0
(not used)
1
Baud Rate Fine Tuning 0 0
PLC Default Station
This is address Modbus Master is reading.
1 1 (not used)
10 Operation (continued)
NOTICE: Do NOT change COM 1 settings. Loss of communication between control and display could result.
Read all on screen instructions before entering System Menu.
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