Configuration
3.13 Communications 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 3-13 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.
ComSTATE
COMMUNICATIONS SELECTION
DISABLE
DISABLE—Disables RS-485 communications
option.
MODBUS
MODBUS—Enables RS-485 Modbus RTU
communication port.
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 by
pressing any key on the front panel.
BAUD
4800
9600
19200
38400
BAUD RATE is the transmission speed in bits per
second. This value is used for both RS-485 and IR
Communications, but for IR Communications, values
below 19200 baud are interpreted as being 19200
baud.
4800 BAUD
9600 BAUD
19200 BAUD
38400 BAUD
84 UDC3200 Universal Digital Controller Product Manual 12/04
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