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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

Issue 0297

Issue 0297

11-10-0000 POCSAG PAGING TRANSMITTER

DESCRIPTION

11-10 POCSAG PAGING TRANSMITTER

The 11-10 is a standalone 5 watt POCSAG transmitter with an in-built encoder. The unit can be controlled via an RS232 serial interface to provide numeric and alphanumeric POCSAG encoding. This enables a user to call a pager (2,000,000 codes), append an appropriate priority level (1 of 4), and add a numeric or alphanumeric message. Messages are limited to 80 characters by the 11-10 buffer size, and to 70 characters by the Product Support Disk (PSD) programming software. Serial control is achieved using ASCII character commands. When the 11-10 is programmed as an alphanumeric encoder, provision is made for pre-programmed messaging. The unit supports 4 digital inputs plus two common battery inputs, each having low voltage detection. The inputs can be configured for a number of options including the ability to transmit a common message (Unit ID) as well as append a unique message in the same transmission. They can also be programmed to call one of seven pagers, the codes of which are pre-loaded into EEROM, and can be either active high, active low, or both. Provision to transmit a message more than once is also catered for as well as the time between each transmission.

USER'S HANDBOOK

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.

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Sea Air and Land Communications Ltd, PO Box 22-621, 120 St Asaph Street, Christchurch, New Zealand.

NOTE: This issue covers serial numbers greater than 11-10-0020

SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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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 regul-atory requirements. We accept no responsibility for incorrect installation. We reserve the right to change products, specifications, and installation data at any time, without notice.

AUTO TEST

To assist in transmitter testing and alignment, a POCSAG AUTO TEST facility is provided in the firmware. This is activated by shorting pins 1 and 2 of header TEST2 and is controlled by grounding inputs 1 to 4 on terminal block TB2. Once the test facility is activated: ! If inputs 1 to 4 are left floating, AUTO is enabled and the processor generates a POCSAG output of equal mark and space duration for each phase of 5 seconds. ! If INPUT 1 is pulled to ground, AUTO is enabled and the duration of each phase is 1 second. ! If INPUT 2 is pulled to ground, AUTO is enabled and the duration of each phase is 2 seconds. ! If INPUT 4 is pulled to ground, AUTO is disabled and the sense of the mark and space follows INPUT 3 as a ground is applied and removed. ! If Hex 8 is grounded, a continuous stream of 512Bd modulation is transmitted ! If Hex 8 and Hex 4 are grounded, a continuous stream of 1200Bd modulation is transmitted.

TRANSMITTER The transmitter consists of a 53.3MHz Colpitts oscillator (Q6) utilizing a varicap diode for direct FM modulation. Q7 amplifies the oscillator output which is fed via L3, C51, C52 and L4, C53, C54 tuned to x3 oscillator frequency to the base of class A stage Q8 for further amplification. The 138-160.6MHz signal is further amplified by Q9, Q10 & Q11, tuned and impedance transformed by L12, CV2, C69, filtered by a two stage LP filter, and delivered to the aerial connection. Transmission is initiated by a low being applied to the base of Q12 by the POCSAG encoder, turning on Q12 which controls the +Ve supply to all circuitry except Q11. With POCSAG modulation, the output frequency shifts between f - 4kHz and f + 4kHz representing `1' and `0' respectively (or f 2KHz and f + 2KHz), never returning to the nominal carrier frequency since either a `1' or a `0' must be present. A 0V, +5V signal provided by the POCSAG output of the encoder to the R49/R50 junction operates the POCSAG modulator transistor, Q5. NOTE: Since the 11-10 is designed for pager operation, transmission periods should be limited to 1 minute at full power. If a continuous output, or a duty cycle greater than 50:50 is required, reduce the output to 3.0 Watts by increasing the value of R75 from 10O to 47O or 68O.

TUNING

1. 2. 3. 4. 5. 6.

7. 8. 9.

Install the correct crystal. Connect the transmitter to a 50O load. Connect the unit to +13.5V. Short pins 1 and 2 on TEST 2 to activate the PTT. Pull INPUT 4 to ground to disable the AUTO TEST (refer to the previous section ). Leave INPUT 3 floating. Using an EVM with a 100K on the probe tip for isolation, check Q6 base and emitter voltage to ensure oscillation. The volt difference should be approx 0.4V. With the probe on Q8 emitter, tune L3 and L4 for a dip. With the probe on Q9 base, tune L5 for a maximum negative DC voltage. With the probe on Q10 base, tune L6 for a maximum negative DC voltage.

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NOTE: This issue covers serial numbers greater than 11-10-0020

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NOTE: This issue covers serial numbers greater than 11-10-0020

SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

Issue 0297

10. Peak CV1 & CV2 for max power. If 5W or above, increase R75, or if below 4W, decrease R75. The current drawn should be approx 800mA. Do not transmit without adequate heat sinking on Q11. 11. Check the unit for low voltage operation. Reduce the supply voltage to 6v and increase it slowly until the transmitter starts. If above 9.5v adjust L5 inwards slightly for maximum power while progressively reducing the supply voltage. 12. Ground INPUT 3 to alter the state of the PROCESSOR POCSAG output to determine if the transmitter frequency is above or below the nominal frequency. 13. Using RV3 which adjusts the frequency span of the POCSAG mark and space, and L1 to set the transmitter frequency, set up the transmitter so that the frequency swings from nominal frequency -4KHz to nominal frequency +4KHz (or -2KHz to +2KHz).

Context sensitive help is available from anywhere within the program by pressing F1. Figure 1 shows the cable connections for 9 pin and 25 pin serial ports. For use with non-messaging (priority tone only) pagers and messaging alphanumeric pagers, different PSDs are required: (1) Tone-only pagers PSD = S1110TW1 (2) Alphanumeric pagers PSD = S1110WE1 To run the PSD, place the disk into floppy drive A. Type either "A:S1110TW1", or "A:S1110WE1" (whichever is appropriate) and press <Enter> (do not key in the quotation marks).

LOW VOLTS

To set up the low voltage alarm for +12V(1) (pin 4 of TB1), monitor the voltage on pin 1 of TEST1 and reduce the +12V(1) voltage. A drop off in voltage indicates the trigger level. Adjust the threshold (normally 10.5 to 11.0 Volts) with RV1. To set up the low voltage alarm for +12V(2) (pin 3 of TB1), monitor the voltage on pin 3 of TEST1 and reduce the +12V(2) voltage. A drop off in voltage indicates the trigger level. Adjust the threshold (normally 10.5 to 11.0 Volts) with RV2.

PROGRAMMING

To set the field programmable options, the unit must be connected to the serial port of a computer running the appropriate Product Support Disk (PSD) which contains the software to program the 11-10 to the end user requirements.

Figure 2: Programming Cable

NOTE: This issue covers serial numbers greater than 11-10-0020 Page 6

NOTE: This issue covers serial numbers greater than 11-10-0020

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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OPERATION:

Non-messaging (Priority Tone Only) Pager Configuration. Default Configuration: To use the 11-10 in the default single code 4 level, connect the unit to the power supply. The power connections are shown in figure 2.

Hardware Selectable Pager Code Configuration: In addition to the single (default) programmable pager code, a further 15 pager codes can be programmed. Programming of these additional codes is performed using the S1110TW1 PSD. Once programmed, these codes can be hardware selected via the BCD addressed inputs, pins 1 to 4 on terminal block TB3 (refer to figure 4). The following examples provide the key to operation. Example 1: If pager code 5 is to be transmitted, pull terminals TB3-1 and TB3-3 low (inputs taken to negative supply). Example 2: If pager code 15 is to be transmitted TB3-1, TB32, TB3-3 and TB3-4 will be held low (inputs taken to negative supply).

Figure 3: 11-10 Power Connections

Using the S1110TW1 PSD, program the unit with the required pager code. To call the programmed pager number, earth the appropriate terminal of TB2 for the required pager priority level (minimum of 0.2 seconds duration momentary contact). The pager priority level connections are shown in figure 3.

Figure 4: Addressing Programmed Pager Codes

To send an alternative code to the default: (1) Select required code by BCD addressing TB3 as outlined above.

Figure 4: Pager Priority Level Terminals

(2) Call the addressed pager by connecting the appropriate terminal of TB2 (for the required priority level) to earth (minimum of 0.2 seconds duration momentary contact).

NOTE: This issue covers serial numbers greater than 11-10-0020

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NOTE: This issue covers serial numbers greater than 11-10-0020

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

Issue 0297

Serial Commands: With the 11-10 connected to a computer via the serial port, additional commands can be issued using a terminal program such as PROCOM. The default communications protocol is 9600BPS, No Parity, 8 data and 2 stop bits. (1) Call Pager via Serial Comms: A pager can be called by issuing the command CPXXXXXXXY. Where "X"=Pager ID, and "Y"=Level (1 to 4). e.g. CP12345672 would call pager 1234567 with a priority level of 2. (2) Read Serial Number: An 11-10 can be commanded to return its serial number with the command SN?. A typical resonse would be: POCSAG/1 11-10-0004 940319 001 301 1092 a Where: POCSAG = Firmware Name 11-10 = Salcom Product Number 0004 = Serial Number 940319 = Year/Month/Date programming date 001 = Batch Number 301 = Software Revision 1092 = PCB Date

When an 11-10 is programmed as a numeric/ alphanumeric POCSAG paging transmitter, some aspects of the hardware are automatically reconfigured: (1) Terminal block TB2 is configured as shown in figure 5. Changing the state of the appropriate terminal of TB2 initiates a message transmission to the pager address assigned to the terminal. Both the message and the pager address are assigned using the PSD. Individual messages and pager address numbers can be programmed for the input switch dependent on the sense of the change of state.

Figure 6: TB2 Input Switches

(2)

Terminal Block TB3 which terminates the BCD pager code address lines, when the 11-10 is configured for Non Messaging (Priority Tone Only) Pagers, is not used when configured for Alphanumeric Pagers.

OPERATION:

Numeric or Alphanumeric Messaging Pager Configuration. Default Configuration: To use the 11-10 in the default numeric/alphanumeric mode, connect the unit to the power supply. The power connections are shown in figure 2. Program the unit using the S1110WE1 PSD.

Battery Inputs and Watchdog: The +12 Volts DC (1) and +12 Volts DC (2) inputs can also have actions assigned to them. Different messages and pager addresses can be programmed for battery high and battery low conditions. A single message can be assigned to the watchdog.

NOTE: This issue covers serial numbers greater than 11-10-0020

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NOTE: This issue covers serial numbers greater than 11-10-0020

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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Serial Commands: Serial commands can be issued to an 11-10 programmed as a numeric/alphanumeric paging transmitter using a terminal program such as PROCOM. Priority tone only, numeric and alphanumeric pagers can be called using serial commands. The default communications protocol is 9600BPS, no parity, 8 data and 2 stop bits. Alternative baud rates are available. (1) Call Tone Pager: A non-messaging (priority tone only) pager can be called by issuing the command: Command CPXXXXXXXL<CR> Where: CP = Call Pager (Tone Only) XXXXXXX = Pager ID (7 numeric digits) L = Level (priority 1 to 4) <CR> = Carriage Return Call Numeric Pager: A numeric messaging pager can be called by issuing the command: Command CNXXXXXXXL<CR> String SSSSSS SS <CR> Where: CN = Call Numeric Pager XXXXXXX = Pager ID (7 numeric digits) L = Level (priority 1 to 4) <CR> = Carriage Return String = The message to be displayed on the pager NOTE: The numeric string is restricted to the standard POCSAG numeric pager characters (0 to 9 comma ] [ - E and U) and the message size is limited to 20 characters. When non standard characters are inserted into the message string they are transmitted as spaces.

(3)

Call Alphanumeric Pager: An alphanumeric pager can be called by issuing the command: Command CAXXXXXXXL<CR> String SSSSSS SS <CR> Where: CA = Call Alphaumeric Pager XXXXXXX = Pager ID (7 numeric digits) L = Level (priority 1 to 4) <CR> = Carriage Return String = The message to be displayed on the pager NOTE: The maximum alphanumeric message size which can be transmitted by the 11-10 is 80 characters.

SPECIFICATIONS

Frequency Channel Spacing Output Power Power Consumption Modulation Spurious Outputs Transmission Initiation Case Dimensions Type Approvals 138 - 165MHz 12.5KHz 25KHz 5 Watts 50O (25 Watts optional) Standby : 15mA Transmit: 900mA POCSAG 512Bd/1200Bd -26dBm "Pull down" <1mA for all inputs RS232 109 x 105 x 32mm New Zealand - RFS31, RFS26 Australia 235WR509

(2)

SEA AIR & LAND COMMUNICATIONS LTD

PO Box 22-621, 120 St. Asaph Street, Christchurch, New Zealand Phone: (03) 379-2298 Fax: (03) 365-1580

Email: [email protected]

NOTE: This issue covers serial numbers greater than 11-10-0020

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NOTE: This issue covers serial numbers greater than 11-10-0020

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SALCOM 11-10 POCSAG Paging Transmitter User's Handbook

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Figure 8: 11-10 Component Layout

NOTE: This issue covers serial numbers greater than 11-10-0020 Page 13

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