Salcom 12-62 POCSAG Product Information - page 2
12-62 SYNTHESIZED NRZ TRANSMITTER USER’S MANUAL
Issue 1262UG 1011
Sea Air and Land Communications Ltd
Page 2
2.0
WARRANTY
Our Products are warranted for a period of 12 months from date of purchase against
faulty materials and workmanship. Should any fault occur the unit should be returned
to the vendor, freight pre-paid. Please include a description of the fault to assist with
prompt return. Any unauthorized alterations or repairs will invalidate the warranty.
3.0
DISCLAIMER
All information provided in this document is carefully prepared and offered in good
faith as a guide in the installation and use of the 12-62. Installers must ensure that the
final installation operates satisfactorily within the relevant regulatory requirements.
We accept no responsibility for incorrect installation. We reserve the right to change
products, specifications, and installation data at any time, without notice.
4.0
MECHANICAL DESCRIPTION
The 12-62 is enclosed in an extruded aluminium box. The end-plates unscrew and
the lid slides off to allow access to the component side of the pcb. The complete pcb
can then be slid out of the case if required, the heatsink relies on a light pressure
contact with the case for heat dissipation, The case has four holes for mounting the
unit. The 12-62 must be mounted away from sources of heat, damp or vibration.
5.0
INSTALLATION
The power supply is connected via P1, green power connector to +13.8 Volts and
Ground. The supply input is protected against reversed connection.
Radiation Hazard: Important! To comply with FCC Controlled /Occupational
Exposure Limits, the aerial must be positioned or mounted to operate at least 0.2
metre away from Occupational Staff and 0.5 metre away from the General Public. Use
only supplied aerial.
It is recommended to site the aerial a few metres away from the 12-62 to avoid the
possibility of RF feedback causing problems with the transmitter operation. An outside
aerial is preferable and will provide better radio coverage. The aerial connection is via
the BNC connector, and should present a nominal load of 50 S, with a VSWR of
better than 1.8:1.
External indicators consist of a power indicator GREEN LED, normally flashing ON
once per second to indicate healthy microcontroller operation.
12-62 SYNTHESIZED NRZ TRANSMITTER USER’S MANUAL
Issue 1262UG 1011
Sea Air and Land Communications Ltd
Page 3
After a debounce period, the green LED will flash rapidly if the low supply detector is activated.
The RED LED will indicate when the unit is transmitting. A flashing RED LED indicates the unit
cannot transmit as either the synthesiser is out of lock, the 12-62 is critically hot or an internal
fault has been detected.
S2 and S10 Connections
S2 Connections:-
S10 Connections:-
Pin 1
Ground
Pin 1
PTT OUT, 50mA max.
Pin 2
Interrupt
Pin 2
GROUND
Pin 3
SCL
Pin 3
Discrete Input 4
Pin 4
SDA
Pin 4
Discrete Input 3
Pin 5
RS232 Tx
Pin 5
Discrete Input 2
Pin 6
RS232 Rx
Pin 6
Discrete Input 1
Pin 7
PTT Input for NRZ operation
Pin 8
Modulation Input for NRZ operation
6.0
OPERATION
The 12-62 can transmit 3 types of POCSAG message, with any one of 4 function
levels:
•
Alphanumeric transmissions. Message can contain any alphanumeric ‘ASCII’
character.
•
Numeric transmissions. Message contains only Numeric characters and some
symbols.
•
Tone Only transmissions (Alphanumeric or numeric with no message)