Configuration
3/07 UDC3500 Universal Digital Controller Product Manual 161
3.23 Communications Set Up Group
Introduction
The Communications group lets you configure the controller to be connected to a host
computer via Modbus
®
or Ethernet TCP/IP protocol.
Introduction
A controller with a communications option looks for messages from the host computer. If
these messages are not received within the configured shed time, the controller will
SHED from the communications link and return to stand-alone operation. You can also
set the SHED output mode and setpoint recall, and communication units.
Up to 99 addresses can be configured over this link. The number of units that can be
configured depends on the link length, with 31 being the maximum for short link lengths
and 15 drops being the maximum at the maximum link length.
Function Prompts
Table 3-23 Communications Group Function Prompts
Function Prompt
Lower Display
Selections or
Range of Setting
Upper Display
Parameter
Definition
Com ADDR
1 to 99
COMMUNICATIONS STATION ADDRESS—This is
a number that is assigned to a controller that is to be
used with the communications option. This number
will be its address. This value is also used for IR
transactions.
ComSTATE
COMMUNICATIONS SELECTION—enables the
RS-485 or Ethernet communications port.
DISABLE
DISABLE—Disables communications option.
MODBUS
ETHERNE
MODBUS—Enables RS-485 Modbus RTU
communication port. Appears only when a
communications board is installed.
ETHERNET—Enables Ethernet communications
port. Appears only when a communication board is
installed.
IR ENABLE
DISABLE
ENABLE
IR ENABLE—Disable/Enables IR communications
port.
ATTENTION If there are no IR communications
transactions for four minutes, then the IR port
automatically shuts down. It can be re-enabled at
any time by pressing any key on the front panel.
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