Honeywell UDC2800 Product Manual page 72

Selections or
Function
Range of
Prompt
Setting
Computer SP
Unit
Engineering
Unit
Percent
Local
Loopback
Disable
Enable
Parameter Definition
Computer Setpoint Units
Engineering units
Percent of PV range
Local Loopback tests the RS-485 communications
port. It is not used for any other communications
port.
Disables the Loopback test.
Allows loopback test. The instrument goes into
Loopback mode in which it sends and receives its
own message. The instrument displays PASS or FAIL
status in the upper display and LOOPBACK in the
lower display while the test is running. The instrument
will go into manual mode when LOOPBACK is
enabled with the output at the Failsafe value. The test
will run until the operator disables it here, or until
power is turned off and on.
ATTENTION: The instrument does not have to
be connected to the external communications
link in order to perform this test. If it is
connected, only one instrument should run the
loopback test at a time. The host computer
should not be transmitting on the link while the
loopback test is active.
Chapter 4 - Configuration
72