PPD Maintenance Manual
T1DA0502-002, Rev A
Page 6
A site may have PPD IDs set within a certain range to prevent other PPD ID RF transmissions
from an adjacent site from being picked up and displayed. Adjacent facilities must establish a
mutual plan of ID ranges or frequency of operation to isolate each system. There are also pull-
pin and man-down option settings that the user may wish to customize.
2.1
PPD ID Guidelines
This section describes the various factors controlling PPD ID offset and range settings.
The PPD supports IDs in the range 0-4095, and there are two offsets that may be applied, the
PPD offset and the low battery (LB) offset.
There are also two PPD ID range types in use with the Flare System. The old range type (type 0)
evolved from the need to retain backwards compatibility with existing systems and compatibility
with the ID coding of other transmitter vendors. The new range type (type 1) was introduced to
simplify offsets and ranges. The Flash system uses only range type 1.
There are also two types of ID modulation, the older 12 bit, and the newer modulation which
uses 14 bits to provide optional PPD features such as pull-pin and man-down module (tilt)
alarms. For each of these there are ini settings, which must be set before any ID programming is
performed. Note that the ini settings used in setting PPD IDs (Transmitter Programmer.ini) must
match the corresponding settings in the system ini file.
2.1.1 PPD
Offsets
The PPD offset is a value that is added to the ID set via the Transmitter Programmer software to
form a PPD transmit ID. This is the code that the PPD transmits. In addition, for 12 bit mode the
low battery condition is signified by adding a low battery offset:
PPD transmit ID = PPD ID + PPD offset
PPD transmit ID for LB = PPD ID + PPD LB offset
For a user-programmed ID of 1001 in 12 bit mode (with PPD offset = 467 & LB offset = 500):
PPD transmit ID = 1001 + 467 = 1468
PPD transmit ID for LB = 1001 + 467 + 500 = 1968
The system (Flash or Flare) in which the PPD is used must be configured with the same offset
values in its ini file as those used to program all of the PPDs. When configured correctly, the
system software subtracts the same offsets from the received PPD transmit ID and displays the
original user set PPD ID.
2.1.2 Range Type 0 (early Flare systems - circa 2002)
The PPD offset follows the rules:
if the PPD ID is in the range 0 to 999 then the PPD Offset = -3300
if the PPD ID is in the range 1000 to 4095 then the PPD Offset = 467