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12-90 PAGING TRANSCEIVER &
STORE & FORWARD REPEATER
PRODUCT INFORMATION
SEA AIR AND LAND COMMUNICATIONS LTD, CHRISTCHURCH, NEW ZEALAND
SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER
12-90 Paging Transceiver
& Store Forward Repeater
GENERAL
The 12-90 is a simple to configure POCSAG paging transceiver with high sensitivity
receiver combined with a 100mW transmitter. It operates over the frequency range of
440-479MHz decoding and encoding 512 or 1200 baud, alphanumeric or numeric
messages.
The 12-90 can be used as:
•
A full paging transceiver, allowing both the encoding and decoding of paging
messages.
•
A stand alone receiver.
•
A stand alone transmitter with channel busy check function before transmissions.
•
An autonomous paging store and forward repeater with duplicate message reject.
•
A point to point raw serial link.
•
A simple telemetry solution.
The 12-90 can be controlled via an RS232 serial interface to provide numeric,
alphanumeric and tone-only POCSAG encoding. This enables a user to call a pager (over
2,000,000 codes), append an appropriate priority level (1 of 4), and add a numeric or
alphanumeric message.
The 12-90 supports multiple message queuing and will queue up to four 73 character
messages, or as many smaller messages that will fit into the available memory buffer. It
also supports full batching of serially queued and input messages, ensuring that messages
are transmitted quickly with minimal transmit on time. Pre-defined input messages can be
configured using any serial terminal application and are limited to a maximum length of 40
characters.
The unit supports 2 discrete inputs with different pre-programmed messages on high and/or
low transition. Provision to transmit a message more than once and variable time between
transmissions are catered for.
The 12-90 supports Salcom relay control protocol to control one on board relay plus several
"virtual outputs". Virtual outputs can be used to remotely trigger input or periodic messages
and provide a mechanism to acknowledge reception of messages. The 12-90, through the
use of a virtual output, can transmit the received signal strength of the last received
message allowing the receiver positioning and system health to be monitored. The 12-90
can be configured to automatically respond with checksum information of the last received
message allowing robust, error free systems to be developed.
Expansion of the 12-90 is possible through the use of the 12-34 relay module and 12-32
input module, allowing any number or outputs or inputs to be supported.
Sea Air and Land Communications Ltd
Issue 1290UB 0211
Page 2
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Table of Contents
Summary of Contents for Salcom 12-90
- Page 1 Expansion of the 12-90 is possible through the use of the 12-34 relay module and 12-32 input module, allowing any number or outputs or inputs to be supported.
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Page 2: Receiver Operation
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. -
Page 3: Output Control
SALCOM PROTOCOL messages or received signal strength messages to be transmitted. Serial messages can be sent to the serial port as a subset of Salcom protocol using a 12- 45 serial lead. Cap codes should be within the range of 0000008 and 2000000. Message payload should not exceed 73 characters in length. - Page 4 230159 Will open relay and virtual output 5 on a unit with the ID of 23. Virtual outputs are a used to invoke 12-90 actions remotely. These actions include control over triggering of inputs and periodic messages. Virtual outputs can be used to return information about the last received message, such as the received signal strength and checksum information.
- Page 5 The system has 2 12-90s, unit ID 23 and 24. When input 1 on unit 23 is closed the user wishes the relay on 12-90 unit ID 24 to close. When the relay has closed on unit 24 the user wishes the relay on unit ID 23 to close as well to mirror the controlled relay state: Unit 23: •...
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Page 6: Serial Passthrough
Outputs and Control” for more information. The 12-90 can be used to pass raw serial between 12-90 units to form a simplex back to back serial link using a 12-45 serial lead. The serial can be passed to many destinations at once. -
Page 7: Installation
Relay Common safe. Connect a 12 volt DC power supply to P1. The 12-90 is protected against reversed supply connection. The power source must be reasonably noise free. The connections to the relay contacts are made using pins 6(normally open contact), 7(relay common) and 8(normally closed contact). -
Page 8: Unit Number
Although the 12-90 checks the channel if busy before transmission, if the unit ID is the same all units believe that the channel is clear at exactly the same time which may result in message collisions. - Page 9 SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER Issue 1290UB 0211 SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER Issue 1290UB 0211 +01 Unit ID: 01 queued messages until a period equal to the last transmission has elapsed (to give any +02 Freq: 458600000 downstream repeaters a chance to pass the message on again).
- Page 10 In Hi/Lo Msg: This message must be a valid Salcom protocol message in order to be used. Setting these parameters to anything other than a Salcom protocol message will result in no message being transmitted.
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Page 11: Warranty
SALCOM 12-90 PAGING TRANSCEIVER AND STORE FORWARD REPEATER Issue 1290UB 0211 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.