User manual

SCPUHF Paging Transmitter System
SCPUHF Issue 2
4
System Overview
The SCPUHF is a simple flexible UHF POCSAG radio paging transmitter designed to
interface with almost any control equipment. It has four “change of state” input zones, three
of which are dry contact and one which has either a 12V or 0V trigger input. It is normally
supplied with one numeric radio pager, which is matched to the system serial number and
base transmitter identity code.
Both mains powered (PSCPETX) and 12-14V dc input (SCPUHFTX) versions are available.
Additional pagers can be ordered at anytime, provided that you have the chassis serial
number (see diagrams on Page 8) and base transmitter ID (configuration label on inside of
chassis).
Section 1: Configuration
a) Zone Inputs
The RESET input will inhibit operation if closed. When it is opened all zone inputs must be in
the non operational/standby state. The reason for this is that the processor will read the
condition of the zones when the RESET input is closed and programs all zones as inactive at
that time. For this reason we do not recommend the use of this terminal other than to
enforce a program change. We suggest the use of a shunt switch for each zone required to
be inhibited, as this will allow the zones to be selectively or collectively inhibited as and when
required.
Four zoned inputs are provided, zones 1-3 (volt free, dry contact) can be programmed N/O
or N/C whereas zone 4 will accept either a +12v or 0v trigger but not both. All zones are
programmable change of state. The condition of each zone is read at the time of applying
power to the unit or after closing the RESET input. You may apply a continuous positive or
negative to zone 4 if required. Provided that this condition is present at the time of opening
the RESET input, it will expect the +12v or 0v to be removed to trigger the zone.
b) Switch Program Options
REPEAT DELAY: 2 way switch bank (SW1)
A zone which remains triggered can be programmed to continually page with a pre defined
delay between these repeats. The 2-way switch bank is used to select the following periods.
Switches 1 2 PERIOD
OFF OFF NO REPEAT
ON OFF 12 SECS
OFF ON 60 SECS
ON ON 120 SECS
c) Base Pager Number
Switches 1-6 on the 8-way bank are used to set the base address of the first pager. The
binary value read on these switches is used to increment the pager numbers in steps of 8.
For example, if the switches are set to binary 5 (1 on, 2 off, 3 on), the pager number will
have 5 x 8 = 40 added to the pre-programmed value in the software. This is a function of
POCSAG encryption which enables the address to be picked up within the first transmitted
word frame, increasing the efficiency of the unit. The pager identity can only be programmed
by Scope.