Salcom 12-90 User manual

12-90 PAGING TRANSCEIVER &
STORE & FORWARD REPEATER
PRODUCT INFORMATION
SEA AIR AND LAND COMMUNICATIONS LTD, CHRISTCHURCH, NEW ZEALAND
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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 boardrelay 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.

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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.
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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).
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.
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.
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.
• Numeric transmissions. Message contains only Numeric characters and some
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.
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.
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).
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

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repeater.
• Reception of a relay control protocol packet configured to trigger input, periodic
messages or received signal strength messages to be transmitted.
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SALCOM PROTOCOL
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.
Alphanumeric Message Example:
To send the message of “Test Message” to cap code 1234567 beep level 1 at 512 baud.
CA1234567<SPACE>1<SPACE>Test Message<CR>
To send the message of “Test Message” to cap code 1234567 beep level 1 at 1200 baud.
ca1234567<SPACE>1<SPACE>Test Message<CR>
Numeric Message Example:
To send the message of “01109” to cap code 1234567 beep level 1 at 512 baud.
CN1234567<SPACE>1<SPACE>01109<CR>
To send the message of “01109” to cap code 1234567 beep level 1 at 1200 baud.
cn1234567<SPACE>1<SPACE>01109<CR>
If successfully queued for transmission the 12-90 will report:
CA12345671<CR> (if Alphanumeric 512 baud) or ca12345671<CR> (if Alphanumeric
1200 baud)
Many messages may be sent to the 12-90 at once without waiting for the transmission to
complete. These are added to a batched paging transmission. This is the most efficient
method to quickly transmit messages.
If successfully transmitted the 12-90 will report:
<SPACE>Page Sent<CR>
OUTPUT CONTROL
The relay and outputs are controlled using Salcom relay control protocol (see Relay
Control Protocol below).
The 12-90 will look for the relay control protocol embedded anywhere within the message
payload, so will cope with messages like “Main Door Open 01109” or “02112378987
01109”.
Relay Control Protocol: Relay commands take the form IIC0X9 where:
II is the 2 character unit ID, C is a variable number of relays to close (1-8). 0 marks the end
of relays to close, X is a variable length list of relays to open (1-8). Commands are always
terminated by a 9. A red LED will display on the PCB showing when the relay is closed.
e.g.
23109 Will only address a unit with matching ID 23. Relay will be closed. No other action

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taken.
231509 Will close relay and virtual output 5 on a unit with the ID of 23.
230159 Will open relay and virtual output 5 on a unit with the ID of 23.
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VIRTUAL OUTPUTS AND CONTROL
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.
Virtual outputs are addressed in exactly the same fashion as the on board relay.
The following examples assume a unit ID of 23.
Control
Message
Function
23109 Close on board relay
23019 Open on board relay
23059 Trigger Input 1 high message to be transmitted
23509 Trigger Input 1 low message to be transmitted
23069 Trigger Input 2 high message to be transmitted
23609 Trigger Input 2 low message to be transmitted
23709 Trigger periodic message to be transmitted
23079 Trigger the unit ID, message length and checksum to be
transmitted.
A message of “CA1234560 2 test 01079” will result in unit 01
responding with “010A02E1” where first 2 digits are the
responding unit ID, the second 2 digits are the message length in
hex, the last 4 digits are the message checksum in hex. The
length and checksum are calculated over the message payload
“test 01079”. The checksum is the sum of each ASC II value in
the message (e.g. 116+101+115...). The responding unit will use
the same cap code as used by the “serial passthrough” mode of
operation.
23089 Perform a system reset.
23809 Trigger received signal strength message to be transmitted. This
is the signal recorded when this message is received. This
feature is valuable for checking system health or for initial system
configuration. This message is transmitted to the first cap code
programmed in the first cap code range. The first 2 characters of
the returned message is the unit ID of the responding unit.
Returned example message will be: 01:-87dBm.

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23409 Trigger received signal strength message to be sent to SERIAL
PO RT - but not transmitted.
Serial port message will be: caNNNNNNN 1 01:-87dBm. Where N
is the first Cap code specified in the first Cap range and 01 is the
ID of the responding unit.
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MESSAGE ACKNOWLEDGMENT
Using a virtual output a message can be automatically acknowledged. If both source and
destination are 12-90 units then this is very easy to implement. With systems using a 12-90
as an endpoint, systems can be configured with absolute certainty of delivery without
corruption.
Example 1: To acknowledge a message that has been transmitted to a 12-90 (unit ID 23).
In this example the user wishes to have acknowledgement when a particular message is
received by the 12-90.
The user transmits: CA1234567<SPACE>1<SPACE> Pump Failed 23069<CR>
When the message is received by the 12-90 a virtual output is controlled which triggers the
input 2 high message. The input 2 high message has been previously programmed to be:
CA1234560 4 Message Acknowleged<CR>
Example 2: The user wishes to control the relay at a destination 12-90 unit and wishes to
acknowledge when this output has closed. A simple back to back telemetry system can be
implemented driven from automatic acknowledgments.
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: • The input 1 low message is configured as CA1234567 1
240169
• The input 1 high message is configured as CA1234567 1
241609
The configured messages for unit 23 closes both the physical relay and triggers the virtual
output that transmits configured input 2 messages.
Unit 24: • The input 2 low message is configured as CA1234567 1
23019
• The input 2 high message is configured as CA1234567 1
23109
(NOTE: Input 2 is not used on this unit)
Example 3: The user wishes to deliver any message to the 12-90, and have absolute
confidence that the message was received without corruption.
The user sends the message “test” to unit id 01: CA1234560 1 test 01079<CR>
The virtual output control code “01079” must be added anywhere into the message. This
will trigger unit 01 to respond with: 010A02E1<CR>

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If the unit ID, message length and checksum match that of the transmitted message, then
the message has been received, and does not need to be re-transmitted. (See “Virtual
Outputs and Control” for more information.
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SERIAL PASSTHROUGH
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. This mode is well suited as a cost effective link between Salcom 12-76 telemetry
units.
The serial mode must be first configured to be ‘2'. Since the cap code and paging
information is not supplied this is taken from the first cap code specified in the first cap code
range. The performance of the serial link can be improved considerably by using a cap
code that is divisible by 8 - such as 1234560. This cap code must match both the source
and destination units. The RX mode must be set to A1200 (auto set when option is
enabled). In this mode if configuration changes need to me made the first character after
cycling the power must be the ‘+’ character, preventing accidental configuration changes
by random commands.
Connection speed at source and destination is 9600:N:8:1 but internally the speed is set
to the paging transmission speed (1200 baud by default). Some message buffering is
possible (100 characters) but continued transmission at 9600 will result in data loss. The
message “BUSY” will be returned from the 12-90 when there has been a buffer overrun.
Serial data is transmitted immediately (if the channel is clear) after a carriage return, or
after 100 mS of serial inactivity. Only ASCII characters between 0x01 and 0x7f can be
transmitted.
Benefits:
• Serial broadcast to many units simultaneously is possible.
• Serial data is packetized and contains bit error correction information which may
outperform traditional radio modems in noisy environments.
SERIAL MESSAGES
The following messages may be seen during normal operation.
Startup Message: SALCOM 12-90 V1.21<CR>
Error Messages:
BUSY<CR> Transmission queue is full. Try again later.
Q FULL<CR> When configured as a store forward unit the received
message was dropped because there was no message
queue space available.
Info Messages:
CHAN BUSY NN<CR> Waiting to transmit - there is someone already transmitting on
the channel - The 12-90 will transmit when able to. NN
provides information as to how busy the channel was.
DUPL<CR> When configured as a store forward repeater this message

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means that a message has been received and duplicate
rejected because there was a message received in the last 40
seconds that was the same.
INSTALLATION
A correctly matched 50 ohm aerial must be connected before operating the
transmitter. Failure to do so may result in damage to the unit.
Situate the 12-90 away from direct sunlight, vibration and strong heat sources, and avoid
close proximity to radio transmission equipment. The unit is not certified as intrinsically
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). The relay is not to be connected directly
to mains voltages.
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 the supplied aerial, or correctly matched and installed alternative.
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S2 and S10 Connections
S2 Connections:- S10 Connections:-
Pin 1 Ground Pin 1 +13.8V alternate supply connect
Pin 2 Not used Pin 2 GROUND
Pin 3 Not used Pin 3 Input 1
Pin 4 Not used Pin 4 Input 2
Pin 5 RS232 Tx Pin 5 Do not connect
Pin 6 RS232 Rx Pin 6 Relay Normally Open
Pin 7 Relay Normally Closed
Pin 8 Relay Common

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STORE FORWARD REPEATER OPERATION
When the store forward repeater option has been enabled the 12-90 will immediately
queue messages that have been received for transmission again when possible.
When used as a store forward repeater each store forward repeater should have a
unique unit ID. Changing the unit ID results in a varied pre transmission delay that
prevents multiple store forward units from all transmitting at the same time. 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.
A duplicate message check is performed when in this mode that prevents any same
message that has been received in the last 40 seconds from being retransmitted. This
prevents the possibility of messages bouncing back and forwards between units. The
duplicate message reject functionality is also applied to messages received via the
serial port.
Transmissions are timed when configured as a store forward repeater. A lock out
period equal to the last transmission time prevents any further transmission attempts
until the next store forward in the chain has had time to clear the next message
(together with channel busy checking).
Store forward units must all be configured to be the same baud rate and message type.
UNIT NUMBER
Each unit will respond only to messages containing a matching unit ID or a group ID of
00. Up to 99 unique unit numbers are available when configured as a numeric receiver
(00-99). Approximately 8000 unique unit codes are available when used as an
alphanumeric receiver (any 2 printable characters). Any number of units can be
programmed with the same unit number.
RADIO CHANNEL FREQUENCY
The frequency of the radio channel can be preset at the SALCOM factory as required,
or can be modified by the user without the need of test equipment. The nominal receive
range is 440 to 479 MHz. The receiver bandwidth is narrow ensuring high sensitivity
and is suitable for 12.5kHz channel applications.
CONFIGURATION
All serial commands are sent and received using a standard terminal application
connected at 9600:N:8:1 using a 12-45 programming adaptor.
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Sending MAP<CR> to the 12-90 will display current configuration information.

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+01 Unit ID: 01
+02 Freq: 458600000
+03 RX Mode: A512
+04 Relay Monoshot: 0
+05 RIC Range 1: 1234567,1234567
+06 RIC Range 2: 0000000,0000000
+07 RIC Range 3: 0000000,0000000
+08 RIC Range 4: 0000000,0000000
+09 Store Forward Mode: 0
+10 WDog Timeout: 0
+11 In Debounce: 4
+12 In Tx Count: 1
+13 In Resend Delay: 5
+14 In 1 Hi Msg: CA1234560 1 Input 1 High
+15 In 1 Lo Msg: None
+16 In 2 Hi Msg: None
+17 In 2 Lo Msg: None
+18 WDog Msg: None
+19 Serial Mode: 1
Unit ID: The unit ID is used to uniquely address a unit to control outputs. The unit ID
must be 2 characters. If numeric decoding is specified, then the unit ID must be
between 00 and 99. If alphanumeric decoding is used then any printable character can
be used as part of the unit ID allowing for approximately 8000 possible addressing
codes. The unit of ‘00’ can also be set, but is also used as a group address code.
Typical usage: +01=01<CR>
Freq: This is the receive and transmit frequency. This parameter should be
programmed to be between 440000000 and 479000000 and must be specified in Hz. .
Typical usage: +02=458600000<CR>
Mode: The mode primarily determines the receiver mode of operation. Possible
settings are A512, A1200, N512 or N1200. ‘A’ specifies alphanumeric operation. ‘N’
specifies numeric operation. 512 and 1200 specifies the receiver decode baud rate.
Typical usage: +03=A512<CR>
Relay Mono-shot: If specified, the mono-shot will open the relay after the relay has
been closed for the configured monoshot period. Setting the relay to 0 results in latched
operation (mono-shot timer not operating). The timer can be set in 1 second
increments to a maximum of 65535 (approx 18 hours). When configured, timeout is
rounded up to closest second (setting to 1 second will result in a mono-shot of 1-2
seconds).
Typical usage: +04=0<CR>
RIC Range: Up to 4 receiver decode ranges can be specified. If all 4 RIC ranges are
set to 0, the unit will not operate as a receiver. The first parameter of each range, when
non zero, must not be greater than the second parameter. Each parameter should be
between 0000008 and 2000000. All 7 digits must be specified. The first and second
parameter can be set to the same code if only a single code is required.
Typical usage (to decode all messages for addresses between 1234560 and 1234567):
+05=1234560,1234567<CR>
Store Forward Mode: When set to 1 the store forward repeater operation is enabled.
In this mode of operation a 40 second duplicate message reject timer is enabled. All
received messages are immediately queued for re-transmission when the channel is
not busy.
In this mode each transmission is timed, preventing the transmission of any newly
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queued messages until a period equal to the last transmission has elapsed (to give any
downstream repeaters a chance to pass the message on again). In store forward mode
a pre-transmission delay is applied that varies based on unit ID.

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This delay ensures that if multiple repeaters receive a message simultaneously they will
not check if the channel is busy at exactly the same time (which may result in more than
one repeater transmitting at the same time, possibly corrupting the message).
Typical usage: +09=1<CR> (1=enable, 0=disable)
WDog Timeout: This parameter defines how often to transmit the Wdog periodic
message (if configured) in seconds. If this parameter is set to 0 the Wdog periodic
message is disabled. If to be enabled, this parameter should be set between 10 and
65535.
Typical usage: +10=0<CR>
In Debounce: This is the period that an input must be settled for before transmitting a
message (If configured) for that input. The debounce period is programmed in 25mS
increments. The input debounce can be set between 25mS and 27minutes (0-65535).
Typical usage (to set a debounce time of 100mS): +11=4<CR>
In Tx Count: When an input is triggered (and input message configured) this
parameter defines how many times the input message is transmitted. Setting to 0
prevents any input messages from being transmitted. This parameter can be set
between 0 and 9.
Typical usage: +12=1<CR>
In Resend Delay: When the In Tx Count has been configured to be more than 1 then
the resend delay is the delay in seconds before the triggered input message is
transmitted again.
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. Setting to an invalid message such as “None”
effectively disables the message from being sent. Any input message cannot be
programmed to be longer than 40 characters.
Typical usage (to send to RIC 1234560 beep level 1 Alphanumeric 512 baud when
input 1 transitions to low): +15=CA1234560 1 Input 1 Low<CR>
WDog Msg: This is the periodic message that when configured is transmitted when
the Wdog timeout expires. This message must be configured in the same manner as
the input messages. This message will not be sent if the Wdog timeout is configured to
be 0.
Typical usage (to send to RIC 1234560 beep level 1 Alphanumeric 512 baud):
+18=CA1234560 1 Periodic Message<CR>
Serial Mode: This mode configures serial options.
When set to 1 this is the default “verbose” serial mode. In this mode serial information
is displayed when the channel is busy (CHAN BUSY) and if acting as a store forward
repeater will show when a message has been duplicate rejected (DUPL).
When set to 0, CHAN BUSY and DUPL messages will be suppressed - this allows
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greater compatibility with other Salcom transmitter products.
When set to 2 the 12-90 enters the serial passthrough mode of operation.
Typical usage: +19=1<CR>

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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.
DISCLAIMER
All information provided in this document is carefully prepared and offered in good faith
as a guide in the installation, use and servicing of our products. 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.
SPECIFICATION
Frequency Bands UHF: 440-479MHz
Enclosure. Aluminium. 77 x 101 x 30mm.
Supply Voltage 10v to 17v, Nominal 12V
Inputs and Outputs One relay output and 2 inputs.
Current drain Receive average 30mA plus 18mA when relay energised.
Transmit average(into matched 50 ohm aerial )90mA.
Relay contacts 1Amp @24VDC (Not suitable for 240VAC connection)
Temperature limits -10 to +50degC
Environmental protection Needs protection from weather
Frequency selection method Synthesized, user selectable.
RX sensitivity Approx -121dBm
Tx Power +18dBm.
Rx Bandwidth 10kHz (suitable for 12.5kHz channel operation)
Serial Connection 9600 Baud N:8:1 (for changing unit parameters and
message output)
Aerial connection BNC.
Paging protocol POCSAG 512 or 1200 baud
SEA AIR & LAND COMMUNICATIONS LTD
10 Magdala Place, Middleton, Christchurch 8024,
PO Box 76237 Northwood 8548, Christchurch, New Zealand
P: [phone] F: [phone] E: [e-mail]
Visit us at www.salcom.co.nz