Installation 2-1 ******************************************************* * * * T V S 7 0 1 B I N S T A L L A T I O N * * * ******************************************************* This section describes how to connect a TVS701 controller to your repeater. In some cases, level conversion circuitry may be required to adapt the signals from your equipment to the levels required by the TVS701 board. A patch area and some unused resistor and transistor pads are provided for this purpose. Normally, you will want to prepare a wiring harness that connects the repeater to a connector which mates with J2. J1 is not normally used. ***WARNING*** Components of this board, especially the CPU, are very sensitive to static damage (ESD)! Handle with care! I/O Leads which connect to the processor (digital inputs, audio output) should be connected with special care, as static or voltages exceeding 5V or voltages below 0V will damage the processor. The following section describes the interconnection of each pin on J2: (1) "AUD IN" - This signal is the DTMF audio from the control audio source (repeater receiver speaker, control receiver, phone line, etc). It should provide at least 35 mV RMS. The level at the DTMF receiver (U3 pin 12) should have a minimum of 35 mv RMS and a maximum of 750 mv RMS. This level can be adjusted using VR6 (TL). (2-3) "OUT0, OUT3" - These are remotely programmable open collector outputs which may be used for miscellaneous control functions (such as power control, control of addi- tional transmitters, etc). When activated, these outputs will sink several hundred milliamperes of current. (4) "LPTT" - If a link or auxiliary transmitter is being used, connect its PTT to pin 4. The conection rules are the same as for repeater PTT (below). Note that when the repeater is keyed up to identify, LPTT is not enabled. (5) "Repeater PTT" - This pin will be pulled to ground when the repeater is to be keyed. Installation 2-2 (6-7) "OUT1, OUT2" - These are remotely programmable open collector outputs which may be used for miscellaneous control functions (such as power control, control of addi- tional transmitters, etc). When activated, these outputs will sink current. (8) "LENA" - This open collector signal will sink current whenever the link function is enabled. Because the link function includes some automatically timed capability, this may be used on non-link systems to temporarily enable or disable some external device. (9-12) "AN0, AN1, AN2, AN3" - Analog input voltages may be connected to pin 12 (channel 0), 11 (channel 1), 10 (channel 2), and 9 (channel 3). How these voltages are read depends on the settings of the associated potentiometers (A0 - A3) and the software scaling factor. However, the voltage on the wiper arm of the pot MUST NOT exceed 5V under any circumstances once the processor is installed. Failure to follow this rule may destroy the processor. The pots should be adjusted as follows: For any voltage source which will exceed 5 Volts, the corresponding scaling potentiometer should be set to minimum (turn screw counterclockwise 21 turns or until a clicking is heard). The voltage at the wiper arm should then be adjusted to a fraction of the vol- tage on the input terminal according to the following table: A to D Scaling Table MAX Voltage Fraction Wiper Voltage Software Scale 5.00V 1.0 5.00V "0" 10.00V .5 5.00V "1" 15.00V .33333 5.00V "2" 20.00V .25 5.00V "3" 25.00V .20 5.00V "4" 35.00V .143 5.00V "5" For example, to a nominal site supply voltage of 13.8VDC which will NEVER exceed 15V, apply the 13.8VDC to the appropriate input, and adjust the corresponding pot for a wiper arm voltage of 13.8VDC/3 = 4.6V. Then use software scale "2" when programming this channel. It is also possible to adjust the scaling by measuring the desired voltage, querying the controller, and then adjusting until the con- troller gives the right result. Installation 2-3 NOTE: The telemetry readout has more precision (4 digits) than the actual accuracy in most cases. The value output by the processor is that closest to the center of the average error window. Thus, a reading for 5 volts in will be 4.979, which is within the .5% accuracy specification. (13) "BEEPS" - ID and telemetry audio - Connect an input to the repeater transmit audio to pin 13. This is the controller sound output. The level is approximately 4V peak to peak and can be reduced using pot VR5. (14) "COR" - This signal must go to ground (0 to .6V) when signal is detected on the repeater input. It must not exceed 5 volts when the receiver is idle. If a higher voltage is generated by your radio, it should either be buf- fered by a transistor (using an unused space on the board), or it should be clamped to the +5V supply using a series resistor and a shunt diode. (15) "LCOR" - If a link system is being used, con- nect the link COR signal to pin 15. The connection method should be the same as used on the repeater COR. If no link is being used, leave this pin unconnected. (16,17) "IN0, IN1" - Auxiliary inputs may be con- nected to pins 16 and/or 17. These require the same signal levels as the alarms on pins 18 and 19. These may be read on remote command. (18,19) "ALRM0, ALRM1" - If alarms are desired, they can be connected to pin 18 (Alarm 0), and pin 19 (Alarm 1). These should be pulled low (.4V) in one state, and left open or driven to +5V in the other. If enabled, the alarm software will trigger when an alarm input changes state in either direction. The state of these inputs may be read on command, so the alarms can also be used as auxiliary sense inputs. (20) "GND" - Connect a good RF and DC ground to this pin. (21) "+12V" - Connect a power supply between 9 and 15 volts to this pin. The lower the voltage of this supply, the cooler the on-board regulator (7805) will run. (22) "+5V" - This is an ouput from the board that can be used as a source of regulated +5VDC. No more than 100ma should be used from this source. Installation 2-4 *************************************************** * * * T V S - 7 0 1 T E S T I N G * * * *************************************************** The following procedure may be used to verify correct opera- tion before installation on some remote mountain top. (a) Connect a ground and +DC supply to the appropriate points. (b) Connect a DTMF source to the DTMF input. A convenient source is the speaker output of a transmitter such as an ICOM 2AT. Put a dummy load on the transmitter. (c) Connect a small audio amplifier (such as the battery powered ones available from Radio Shack) to the audio output. Be sure that the amp will not be damaged by the high level available from that output. Power should now be applied to the board. When power is applied, the processor will start within 5 seconds. This is indicated by the green heartbeat LED (LE1) pulsing several times a second. Significantly slower pulsing or none at all indicates that the processor is not running. The board should now be commanded to program the EEPROM with initial values. Until this is done, various beeps and boops may come from the audio without much meaning to them, and the repeater functions may not work. The method of programming is to power on the system, wait for the heartbeat LED to start pulsing, and then enter "###42123". The programming will take about 30 seconds. Sometime during this period, the processor will start beeping once per second. At the completion of the programming, the processor will send, in morse code, "DE TVS701 RDY". This means that the programming was successful. At this point you may pro- gram any parameters that you desire using the control pro- cedures described in the programming manual. Once the ini- tial values have been set and the maintenance password is set, it is recommended that the "PRG" jumper be disconnected (but stored by hanging the jumper shunt on one of the jumper pins). This prevents remote reprogramming of the mainte- nance password.