Snell & Wilcox Premier HD HD2200, Инструкция по установке и эксплуатации

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HD2200 SECTION 3
HD22OP271100 Version 1 Issue 1 3.4
Composite Output
The composite output option for the
downconverter has not yet been implemented.
RollCall
The unit can be controlled via RollCall using this
BNC connector. Control can be also provided from
an external source via an RS-422 9-way D-type
connector.
The RollCall system should be connected using
75 Ohm "T" pieces in a similar manner to an
"Ethernet" system. Both extremities of the system
must be terminated in 75 Ohms.
A unique address for each unit on the RollCall
system must be set by two Hex switches (SW1,
SW3) on the printed circuit board. The addresses
00 and FF are reserved and must not be used.
Hex Switches
Both of these switches are used to define the Unit
Address code for the equipment. They are only
read at power-up.
All positions on these switches may be used to set
the Unit Address code in Hex (0 to F).
Notes: In a RollCall™ segment, all units must
have different unit address codes. For more
information see RollCall™ section.
The coaxial link is bi-directional and therefore must
not be passed through signal switching networks.
Also, to allow hum and noise cancellation the
screen of the coaxial connection must not be
earthed.
RS-422 Port
Pin Function Direction
1 Ground
6 Rx signal common
2 Receive - HD2200
Ä
Remote
7 R HD2200
Ä
Remote
3 Tr HD2200
Å
Remote
8 Transmit - HD2200
Å
Remote
4 Tx signal common
9 Ground
5 Spare
Top
4 Bits
Bottom
4 Bits
RollCall Address
SW1 SW3