Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 12 Page 42 of 265
and connect to Backplanes that allow direct termination of the street cabling,
avoiding the use of termination blocks and soft wire kits.
 An HPU card distributes the 48V lamp supply from the Lamp Supply
Transformer to the LSLS cards and incorporates the Dim/Bright, A and B
relays.
 The Main Processor Card is now coupled with a daughter card (the PHS
card) that in turn provides high-speed serial connection to new LSLS Cards,
IO cards and new Intelligent Detector Backplanes.
 The new serial I/O cards are mounted on the rear panel of the controller
cabinet and allow direct termination of street cabling without resorting to the
use of additional terminal blocks and soft wire conversion kits. Further
information on the I/O card is in section 3.10.
 The new Intelligent Detector Backplanes are mounted in the rack. These
provide support for the connection of up to 4 standard Loop Detector Cards
such as Siemens ST4S. The Backplane connects to a ribbon cable that
terminates in a Loop Termination Board mounted on the cabinet rear panel.
The Loop Termination board provides the termination point for 16 Loop
Feeder pairs without the use of additional terminal blocks and twisted wire
kits. Further information on the Intelligent Detector Backplanes is available in
section 3.11.
 All Loop Detector Cards are powered from a dedicated output from the HPU.
 Each pushbutton is associated in the IC4 configuration with one specific
kerbside detector (if used), thus each pushbutton input and kerbside input
must connected to its correct pushbutton / kerbside. Pushbuttons must not be
commoned together and connected to a single input. See section 7.4 for
more information.
 Internal SDE/SA is available (and does not require the /102 PLD), with the
SDE/SA loops connected to the new Intelligent Detector Backplanes (or new
I/O cards if required).
With the new I/O cards and new Intelligent Detector Backplanes, the ST900 Family
now supports up to 248 I/O lines. The combination of the new I/O cards and new
Intelligent Detector Backplanes in the ST900 completely replaces existing I/O
previously used in the ST800. Neither the main processor card I/O nor the use of I/O
expansion cards 667/1/27003/000 is supported in the ST900.
The ST900 Family supports existing ST800 equipment such as Gemini, Gemini
2
,
Tele12 OTU, IRM/IMU Card, SDE/SA Card (if the SoundMark Interface is required),
etc.
The controller conforms to the UK Highways Agency specification TR2500.