Honeywell ControlEdge 900R04-0200 Getting Started page 88

Chapter 6 - Communication
88
Parameter Description
l
It is selected by default and the controller is on
power saving mode. RS232 transmitter will detect
the connection of external device. If external
device is connected to the controller, the local
transmitter will be enabled for communication. If
there is no external device connected, the local
transmitter will remain disabled to save energy.
l
RS232 transmitter will not detect external device
and if you force enable, more energy is consumed.
The following table describes four scenarios that will happen for
option between the controller and the device it
Force Online
communicates.
Table 6-3: Force online scenarios between the controller and
devices
Third-party
Controller
Device
Force
Force
Online
Online
Option
Option
Enabled Enabled
Disabled Enabled
Enabled Disabled
Disabled Disabled
3. Under
Protocol Binding
to bind Modbus Serial Master to the serial port. See the
Master
following table for parameter descriptions.
Disable
Enable
Communication
Normal
Normal, with energy saving on the
controller
Normal, with energy saving on Device
It is forbidden. Both devices would
consider there is no device connected to
it and hence there is no communication
between them.
, select
Modbus RTU Master
or
Modbus ASCII