Page 29
Page 29 of 72 UTY4422-002
SECTION 3OPERATION3.1 MODES OF OPERATION
3.1.1 Power Up
At power up, the unit does a quick checksum test on the EEPROM. When the test passes, the
unit then initializes various devices and configures itself according to the EEPROM settings. It
then waits for the receiver board to complete its boot-up. When the receiver board boots up, the
unit sends a tune request to the receiver board and the Welcome Banner to the serial port. The
unit then enters alarm mode until all of the alarm conditions are cleared. Total boot-up time is
approximately 25 seconds, but may vary somewhat.
Also, while in power up mode, each of the Unity 4422’s LED's will FLASH. See Table 11
(Page 30).
3.1.2 Boot Fail
If any of the boot fail conditions occur, the unit will enter “boot fail” mode. While in this mode,
the unit is essentially dead. All audio and video is muted, the alarm relay is closed, the general-
purpose relays are all open, and the unit does not attempt carrier acquisitions, etc.
3.1.3 Alarm, Warning, & Normal
See Sections 3.2.7 (Page 31) and 3.2.8 (Page 31) for a complete list of alarm/warning conditions
and for information on the LED's during these modes. The overall behavior of the unit is very
similar for any of these modes, and the following is a list of their differences:
• Alarm and User Relays. See Section 3.3 (Page 32) for details.
• Video, if used, is alarm frozen if No MPEG Data for less than 5 seconds, No Video for less
than five seconds, or in fade mode for less than 10 seconds.
• Video is muted for all alarm conditions except Alarming Eb/No.
• Audio is muted for all alarm conditions except Alarming Eb/No and No Video Data.
• LED's are unique for each of these modes.