Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 109

10
Operation
(continued)
3. Modbus Setup Parameters
Select to bring up the following sub-menu.
Select
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.
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.
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 Port Configure For
Control: communication between boiler display and
boiler control
EMS: communication between EMS and boiler
control
Port Type (non-adjustable)
Special Notes
COM Mode
Baud Rate
Stop Bits
Data Bits
Parity Bits
Comm. Delay (ms)
Comm. Timeout (ms)
Comm. Retry Times
Comm. HMI Station
This is Modbus Slave Address.
Baud Rate Fine Tuning
PLC Default Station
This is address Modbus Master is reading.
106308-05 - 3/23
to view and/or adjust COM port parameters as needed to communicate with an EMS.
APEX Installation, Operating, & Service Instructions
COM 1
Control
Modbus Master
NOTICE: Do not change any of these settings.
Loss of communication to control could result.
RS 485
38400
1 bit
8 bit
None
10 ms
1000 ms
2
0
(not used)
0
1
COM 2
EMS
Modbus Slave
Adjust these settings
to suit the EMS
RS 485
38400
1 bit
8 bit
None
10 ms
1000 ms
2
1
0
1 (not used)
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