Sea Air and Land Communications 1290 Manual De Usuario
SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER Issue 1290UB 0211
Sea Air and Land Communications Ltd
Page 3
The 12-90 utilises an intelligent self adjusting channel busy check to prevent message
collision or corruption which reduces the need to retransmit messages and increases
confidence of delivery.
collision or corruption which reduces the need to retransmit messages and increases
confidence of delivery.
SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER Issue 1290UB 0211
Sea Air and Land Communications Ltd
Page 4
RECEIVER OPERATION
When operating normally, the system LED flashes green once every second. When the
relay is in the closed state the red LED D1 is lit (not visible external to the enclosure). The
relay will operate only when a correct Salcom relay control message is received with a
matching unit ID, or a global address ID of “00”.
To control the outputs a message must be received that matches the unit ID with a suitable
control code sequence (Salcom relay control protocol). The received message must also
be the expected baud rate (512 or 1200) and format (alphanumeric or numeric).
relay is in the closed state the red LED D1 is lit (not visible external to the enclosure). The
relay will operate only when a correct Salcom relay control message is received with a
matching unit ID, or a global address ID of “00”.
To control the outputs a message must be received that matches the unit ID with a suitable
control code sequence (Salcom relay control protocol). The received message must also
be the expected baud rate (512 or 1200) and format (alphanumeric or numeric).
A mono-shot timer can be set for the relay allowing it to open automatically after being
closed. This timer can be set to between 1 seconds to 65535 seconds (in 1 second steps).
Setting the relay mono-shot timer to 0 results in the output remaining latched until a
message is received to change its current state.
closed. This timer can be set to between 1 seconds to 65535 seconds (in 1 second steps).
Setting the relay mono-shot timer to 0 results in the output remaining latched until a
message is received to change its current state.
The 12-90 can be configured to respond to up to 4 different cap code ranges. Messages
will only be decoded (and outputs controlled) if the message address falls within a
configured cap code range.
will only be decoded (and outputs controlled) if the message address falls within a
configured cap code range.
TRANSMITTER OPERATION
The 12-90 can transmit 3 types of POCSAG message, with any one of 4 function levels:
•
•
Alphanumeric transmissions. Message can contain any alphanumeric ‘ASCII’
character.
character.
•
Numeric transmissions. Message contains only Numeric characters and some
symbols.
symbols.
•
Tone Only transmissions (Alphanumeric or numeric with no message)
Alphanumeric transmissions: Messages can contain any alphanumeric character. The
12-90 will accept the standard ASCII 7 bit character set.
12-90 will accept the standard ASCII 7 bit character set.
Numeric transmissions: Messages can contain numeric characters and some symbols.
These can convey a telephone number, or other numerically coded information. Since the
transmitted message is shorter, there is less chance of errors being received by the pager.
These can convey a telephone number, or other numerically coded information. Since the
transmitted message is shorter, there is less chance of errors being received by the pager.
The numeric character set is as follows: 0 1 2 3 4 5 6 7 8 9 [ ] - U <space>
Tone Only transmissions: Any numeric or alphanumeric paging message without an
actual text message is also considered ‘Tone Only’. A function level will control the number
of beeps on the receiver (four different function levels can be sent).
actual text message is also considered ‘Tone Only’. A function level will control the number
of beeps on the receiver (four different function levels can be sent).
INITIATING A TRANSMISSION
Paging messages may be initiated from:
•
•
Change in input state.
•
Periodic message timeout.
•
Salcom protocol message accepted from the serial port.
•
Reception and retransmission of a message when configured as a store forward