Sea Tel DAC-2202, Installation And Operation Manual

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Setup DAC-2202 Antenna Control Unit
5-6

LNB Voltage - This function enables the Tracking Receiver to output 13/18 VDC, and/or 22kHz Tone to
power an LNB and/or control a Matrix Switch. This function is
disabled .

The blockage output (SW2) of the ACU is a
short
to ground circuit when the antenna is in a programmed
blockage zone, is searching, or targeting and or is mis-pointed by 0.5 degrees or greater. Whenever one of
these conditions exist a transistor on the main PCB in the ACU shorts to ground providing a current sink of
0.5 amps max to control below decks dual antenna coax switches or TX Mute control to a satellite modem
(for radiation hazard control or TX mute requirements for FCC compliance).

Relative Azimuth value is normally only visible in the Antenna main menu display. The Azimuth entry menu
normally displays Azimuth position, DishScan tracking signal and AGC.

When Search limit is reached the antenna will return back to the origin of the search pattern.

When the ACU power is turned ON it does not automatically target the satellite that was used last.

Pressing RESET on the front panel of the ACU normally only resets the processors inside but does not re-
target the satellite.
The functions below can be enabled to change the normal behavior of the system if desired. Select system options
according to the following table. Add together all the desired options and enter the sum into the SYSTEM TYPE
parameter to enable the desired functions.
128 Reverse External Modem Lock input polarity (logic hi = lock).
If you know that the modem you will be using with the system provides requires a logic hi (+15 VDC
max) when it has modem lock or you find the AGC reading for locked and unlocked conditions from
your modem need to be reversed you must enable this function in your current SYSTEM TYPE
parameter.
64 Enables LNB voltage output from the ACU.
This is NOT recommended for Series 09 systems, because they ALL provide the LNB voltage at the
pedestal.
32 Display Relative in the Azimuth entry display.
Enabling this function causes REL position to take the place of the DishScan signaling in the Azimuth
entry display. Relative position of the antenna is RARELY more desirable than the DishScan
signaling.
16 Reverse blockage output logic (SW2 logic hi = blocked).
If you know that the modem you will be using with the system requires a logic hi (open circuit) to
mute or you find that the Modem is being muted when the antenna is ON satellite (and un-muted
when the antenna is blocked, searching or targeting) you must enable this function in your current
SYSTEM TYPE parameter.
8 -- Reserved --
4 Auto SAT load after SEARCH failure.
Enabling this function will cause the ACU to re-target the
calculated satellite position
(rather
than returning to origin).
2 Enable External Modem Lock Input (logic low = lock)
This enables the ACU to use the external modem input. Expected input is logic low (0 VDC) when
the modem has RX sync/Network Lock and a positive voltage (+15 VDC
max ) when the does not
have lock. This function must be enabled to use the external input from ANY modem,
regardless of its locked/unlocked logic. [If you find the AGC reading for locked and unlocked
conditions need to be reversed you must add 128 to your current SYSTEM TYPE parameter].
1 Auto SAT load on “hot” RESET and ACU Power-Up.
Enable this function if you want the ACU to automatically re-target the satellite whenever the
system power is turned ON (after antenna initialization) or whenever the operator presses the
RESET button on the from panel of the ACU.
To change the SYSTEM TYPE parameter, press the LEFT arrow key to bring the cursor under the least significant
character. Continue to move the cursor until the desired character to be edited is underscored (selected). Use the UP
or DOWN arrow keys to increment or decrement the selected character. Use the LEFT or RIGHT arrow key to move
the cursor left or right to select other characters to modify. When you are finished modifying press ENTER to execute