Instruction manual

Page 18
UTY4422-001 Page 18 of 74
2.3.9 Serial ASYNC Data, Monitor and Control of IRD
Two serial ports (SERIAL 1 and 2) for data to/from the IRD have the following characteristics:
Table 7. Serial ASYNC Port Requirements
Parameter Specification
Signal Type Serial Asynchronous Character Data
Levels RS-232
Mode Always 8 data-bits, one start, one stop-bit, half-duplex.
Pin-outs DCE to AT-compatible serial port, 3-wire subset (Rxd,
Txd, and Ground) without handshake lines
2.3.10 Option Modules for Expansion Ports
The IRD has two expansion slots - one high speed and one low speed. The high speed expansion
port provides the transport layer multiplexed stream while the low speed expansion port provides
the filtered packet data. An I
2
C bus provides control for option modules. The specifications for
individual modules are included in documentation for the module.
2.3.11 AC Power
The unit features a universal-input power supply. AC line is fed into a standard IEC jack. The
nominal inputs are 115 or 230 VAC ± 10% at 50-60 Hz ± 2%. The total AC current
consumption with the 4:1 RF switch option and max LNB DC load is 0.8A at 115 VAC, and
0.5A at 230 VAC.
2.3.12 LNB DC Power
The unit may feed DC power to an external antenna-mounted LNB using either the RF-In
connector’s center-pin or a terminal on the rear-panel terminal strip (with an external DC power
inserter). The nominal voltage supplied is +17 to +24 VDC, while the maximum load current is
250 mA. The output is short-circuit protected by a thermal fuse. An internal jumper (J27) is
used to enable/disable DC power on the RF-In center-pin. Once that jumper has been set, the
LNB power can be turned on via the front panel menu.
2.3.13 Four Input / One Output RF Switch (Optional)
2.3.13.1 Description
The module is normally installed into the MODULE 2 option-slot position on the back of the
parent IRD. It allows the IRD to select one of four antenna / LNB inputs when its RF OUTPUT
jack is connected via a 75-ohm coax cable to the IRD RF INPUT. There is no power pass for
LNB DC power. (DC for the LNB is provided on the UTY4422 rear terminal strip and requires
an external DC power inserter. No DC voltage is applied to any F connector.) The input and
output RF connectors are Type-F jacks, and they are located on the option module rear panel.