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TEMPERATURE/VOLTAGE LEVEL MODULE KIT 301
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Output to Tele-Alert
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C2 IN1 R6 Figure 22-6 Threshold/comparator (TVL) module.
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input scalers. The higher-value resistor would replace the thermistor, while the lower-value resistor would go to ground. Note, that capacitors C1 and C3 provide noise reduction when external inputs are used. To measure voltage level changes, you simply connect the input wire IN1 to the circuit or system being monitored, adjust the threshold control, and you are ready to go.
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BUILDING THE TVL MODULE
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Construction of the TVL board is quite straightforward and should take only about a halfhour or so. The TVL board consists of a single integrated circuit with an IC socket to facilitate changes if the board ever malfunctions. First, locate the layout diagram to help you orient the PC board and the component layout before starting to construct the board. Be sure to observe the orientation of the integrated circuit before inserting it into the socket to avoid damage at power-up. Note: for initial testing S1/R6 should not be inserted; see below. When later installing the thermistors or scaling resistors, be sure to carefully observe the placement of S1/R6, depending upon the temperature direction you desire to measure or if you want to sense voltage levels. Trim potentiometer R2 is used to set the threshold values for either temperature or voltage level sensing. The trim pots are located at the top of the circuit board. Remember, when voltage level detection is desired, scaling resistors are used in place of the thermistors, as mentioned earlier. The pinouts at the edge of the TVL board are described below and are shown in Table 22-3. At the top of the board, the first solder pad used is pin 2, which is for the 9-V reference connection for the inputs at IN1 and trim potentiometer R2. Pin 3 is used for the system ground connection. Pins 4 and 5 are used for the two TVL outputs to the Tele-Alert board. Solder pads 6 and 7 are not used, while solder pads 8 and 9 are reserved for inputs IN1 and IN2 to the comparators. The last pin at position 10 is used to supply 5 V to the comparator. Once the board has been completed, you will need to place the 10-pin header on the component side of the PC board and solder it on the foil side of the PC board. The 10-pin header allows connection with the main Tele/Page-Alert board. The 10-pin header on the
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302 INPUT SENSOR MODULES
TABLE 22-3 PIN NUMBER
TEMPERATURE/VOLTAGE LEVEL MODULE PINOUTS PIN DESIGNATION
1 2 3 4 5 6 7 8 9 10 IN1 IN2 IN3 IN4
9-V reference voltage System ground Channel 1 output to main board Channel 2 output to main board Channel 3 output to main board Channel 4 output to main board No connection No connection 5-Vdc system power 5-Vdc system power Channel 1 input Channel 2 input Channel 3 input Channel 4 input
TVL board then can be inserted into the 10-pin female header (second inside header) on the main Tele/Page-Alert board once you are ready. Note that pins 8 and 9 are inputs to the comparator, and these pins should be either clipped or bent so as not to be inserted into the Tele/Page-Alert board. The voltage level inputs from the circuit being remotely monitored are connected to pins 8 and 9, i.e., inputs IN1 and IN2, respectively. Your temperature/voltage level module is now complete and ready to go. It is advised that you test your new TVL board before you connect it to the main Tele/Page-Alert board.
TESTING THE TVL BOARD
Connect a scope or multimeter to the channel 1 output on the TVL board. Next, connect the plus ( ) lead from a 5-V power supply to pins 2 and 10, and then connect the minus ( ) lead from the power supply to the system ground at pin 3. For this initial testing, resistors R1/R2 and R3/R4 are not inserted. Now, locate an adjustable low-voltage power supply. Connect the plus lead ( ) from the adjustable supply to the input at IN1 or pin 8, and connect the minus ( ) lead to the system ground at pin 3. Be sure the adjustable power supply is initially adjusted for zero volts before applying to terminals at the edge of the TVL board. Now, turn on the first 5-V power supply and slowly advance the adjustable power supply voltage from 0 to 1 or 2 V You may have to set the threshold to set the trip . point at which you will begin to see an output on the scope. Once the comparator is tripped, the scope reading should change from 0 V to 5 V Once channel 1 has been tested, you can . move on to testing channel 2 in the same manner. Once the TVL board has been tested and
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