Lower Display

Prompt

LOOPBACK

Upper Display

Range of Setting

or Selection

DISABL

ENABLE

Parameter

Definition

LOCAL LOOPBACK tests the communications hardware.

DISABLE— Disables the Loopback test.

ENABLE— Allows loopback test. The UDC goes into Loopback mode in which it sends and receives its own message. The UDC displays PASS or FAIL status in the upper display and LOOPBACK in the lower display while the test is running. The UDC will go into manual mode. The test will run until the operator disables it here, or until power is turned off and on.

ATTENTION The UDC does not have to be connected to the RS-485 link to perform this test. If it is connected, only one UDC 3300 should run the loopback test at a time. The computer should not be transmitting on the link while the loopback test is active.

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Honeywell manual UDC 3300 Process Controller Product Manual