Sea Tel 9711-92 Installation And Operation Manual Download

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Setup – Modem Connections, Setup and Test

9711-92 Ku-Band TXRX

12-4

12.6.4.

STM Modems

A serial cable should be fabricated from an RJ-45 straight serial cable. Cut the RJ-45 off of one end and strip

the outer sheath off. Check continuity of the wire color code to identify color of the wires from pins 1, 2, 3
& 6 to make the connections below.

Connect the wire from RJ-45 pin 1 to the SW2 (TX Mute) terminal of the Terminal Mounting Strip.

Connect the wire from RJ-45 pin 2 to the NMEA TX- (GPS) terminal of the Terminal Mounting Strip.

Connect the wire from RJ-45 pin 3 to the EXT AGC (Network Lock) terminal of the Terminal

Mounting Strip.

Connect the wire from RJ-45 pin 6 to the GND (Ground) terminal of the Terminal Mounting Strip.

12.7.

SYSTEM TYPE parameter

The System Type parameter is used to enable a variety of system functions.

With this parameter value set to 0,

the DAC software functions will be as follows:

•

External AGC, or Modem Lock, function is used to bring an external modem lock signal from a satellite
modem into the ACU as a positive ID that the antenna is on the desired satellite. This input is NOT used

for Tracking purposes, it is only used during search to identify when the antenna has acquired the correct
satellite. This external AGC function in the DAC software is

disabled.

Expected input is 0 VDC when the

modem has RX sync/Network Lock and a positive voltage (+15 VDC

max

) when the does not have lock.

•

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.

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.

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.

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.

Reverse TX Polarity - This must be left OFF in this antenna system.