DP 6000 DIGITAL PAGING SYSTEM
INSTALLATION INSTRUCTION 83
February 1997
Page 14/29
If field call is enabled the transceiver holder can make a call
from the field to a central desk by pressing the PTT button. For
PS transceivers, the field call is controlled by a handshake pro-
tocol.
SYSTEM IDENTITY (OPCODE 1 R)
The system identity which is transmitted with the “mode
word” in the DP6000 code can be used to separate two neigh-
bouring system which are operated on the same frequency.
This feature can only be used in future systems since all the
encoders in the system must have the possibility to use this
function. For now this digit should be set to 0.
OPCODE 1 S
Opcode I S sets four functions:
The first function determines the dial status of the transceiver
(only applicable if the transceiver includes a dial keypad). Dial
signals can be sent out to the central equipment as DTMF sig-
nals or in DP6000 code. In systems using an LBB 6042 dial cou-
pler, the dial signals should be set to DTMF. If an LBB 6042 is
not used, dial signals can be set to DP6000 code. The advan-
tage of dial signals in DP6000 code is that the transmission time
is much shorter and that the transceiver transmits its own
identity together with the dialling code. The central PC control
desk will then display this information on the PC screen or on
the alpha display of the transceiver that is being called.
The second function setting in opcode 1 S determines whether
calls without numeric info are accepted as valid calls. If calls
‘without info accepted’ is programmed, the transceiver will
respond to both calls without and calls with numeric info.
Using this function in systems where all calls are transmitted
with a numeric message (the message can also contain “– – –
–” it can be guaranteed that only calls where both the address
and numeric info are detected are accepted. The coverage can
be improved by repeating the code string. For example, if a call
is repeated three times and the receiver detects only the
address of the first call, the receiver will not bleep but will be
ready immediately to receive the second repeated call string.
The third function setting in opcode 1 S determines whether
messages with an error(s) will be accepted.
With the last bit in this opcode digit the installer can determine
if the backlight button is used for the display backlight function
or to generate pilot-tone I or II (opposite pilot-tone of the sta-
tus setting). This function can be used to switch something with
one pilot-tone and to open the speech channel with the other
pilot-tone, without having to go through the complete user
programming sequence.
SPEECH TIME (OPCODE 1 T)
Opcode 1 T sets the time duration of the speech call as
required in steps of 10 secs (‘F’ means speech time is unlim-
ited). The speech time should be programmed equally in the
central equipment.
RSSI-LEVEL (OPCODE 1 U)
Opcode digit 1 U sets the level of the squelch detector in the
transceiver. The squelch detector is used to sense if the paging
line is occupied (c.q. for speech busy blocking function). The
value to be set is determined in the factory for each receiver
module, when the module is measured and tested. This is indi-
cated by a sticker found on the receiver module. When this
value is preceded by a ‘U’, the value is valid for the UHF
receiver module LBB 6012; when this value is preceded by a
‘V’, the value is valid for the VHF receiver module LBB 6112).
3.3.2 OPCODES 2 AND 3
PERSONAL BLEEP PATTERNS 1 AND 2
Opcode digits 2 P; Q; R and S and opcode digits 3 P; Q; R and
S are used to set the on/off patterns and frequency patterns for
the personal twin-tone patterns 1 and 2. These personal twin-
tones can be heard in the test mode (twin-tone 1 and twin-
tone 2). Figures 8,9,10,11 and 12 show how the setting of these
opcodes will affect the twin-tone pattern (P and Q switches the
bleep on or off; R and S determine the bleep frequency).
PILOT TONES
Opcode digit 2 T and 3 T sets the frequency for pilot-tones 1
and 2 respectively.
The system is delivered for the pilot-tones 180Hz and 220Hz. If
different pilot-tones should be used also the filters in the trans-
ceivers and in the central receivers and desks should be modi-
fied. The pilot tones have been made programmable for very
special applications where more talk back systems operate on
the same frequency.
The list of the programmable pilot-tones frequencies and the
opcode digits are shown in Chapter 3.4.
AUTO TALK BACK TIME (OPCODE 2 U)
It is possible to switch the PS6000 transceiver to transmission
with a special call from the central (p.c.). In this way the central
operator can hear what is going on at the place where the
transceiver is in case of an alarm.
Opcode digit 2U sets the time that the transmitter stays on in
steps of 5 seconds.
OPCODE 3 U (CODEINF DIGIT FOR MANUAL
ACKNOWLEDGE)
Opcode digit sets the value of the codeinf digit with which a
manual acknowledge is requested in an old system where no
mode words are used (to be used in “old-system-mode”).
In comparison to the second generation PS transceivers, this
function changes as follows:
If a request for manual acknowledge is received, the transceiver
bleeps with bleep-pattern No.3 until the reset button is
pressed. In the ‘new-system-mode’ the request for manual
acknowledge is detected by the ‘mode-word’ in the code. In
the ‘old-system-mode’ where the call-string is transmitted with-
out a ‘mode-word’, the call is detected by the codinf. The cod-
inf which is assigned in the system for request calls for manual
