Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 10 Page 94 of 265
The timing range of the window period is 0 to 255 seconds in 1-second steps. There
is one time for each stage. The programmed value of the window timer may be
changed via the handset using the PWN command.
With Appearance Types 1, 2 and 3, the appearance or non-appearance of the
phases may affect the inter-green periods following the stage termination.
The condition of appearance of phases that are deleted by the master time clock will
only be effective during the period of non-deletion – see section 25.
6.7 Fixed Phases
A fixed phase is a phase (real or dummy) that has a condition of appearance Type 0
and is not deleted by time switch at any time.
a) At least one fixed phase must be allocated to each stage (with the exception
of the ‘all-red’ stage if it is only used in manual mode).
b) On stage changes at least one fixed phase must gain ROW.
6.8 Non-Fixed Phases
A non-fixed phase is a phase (real or dummy) of Appearance Type 1, 2 or 3, or a
phase of Appearance Type 0 and is deleted at some time.
During Manual Mode the appearance of a non-fixed phase during its associated
stage(s) may be configured to:
a) Never appear
b) Always appear (subject to any delete phase conditions)
c) Be demand dependent
6.9 Conditions of Termination
6.9.1 Termination Type 0
The phase terminates at the end of its associated stage. If the phase appears in
consecutive stages, it will remain at green throughout the interstage period.
This is the normal type of phase termination.
6.9.2 Termination Type 1
The phase terminates when a specified associated phase gains ROW. The
associated phase must be a fixed phase.
The normal use for this type of phase is a filter green arrow.