barcode generator vb.net code REAL-TIME CLOCK CHIP 281 in Software

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REAL-TIME CLOCK CHIP 281
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TABLE 21-2 PIN NAME
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MX-604 MODEM PINOUTS DESCRIPTION
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XTAL CLK/XTAL M0 M1 RXIN RXAMPOUT TXOUT VSS VBIAS RXEQ TXD CLK RXD DET RDY VDD
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Output of the crystal oscillator inverter Input to the crystal oscillator inverter A logic input for mode setting A logic input for mode setting Input to the RX input amplifier Output of the RX input amplifier Output of FSK generator Negative supply (ground) Internal bias voltage held at VDD/2 An input to enable/disable equalizer An input for FSK modulator or retiming An input, used to clock in/out bits Output from FSK demod or retimed data An output of on-chip energy detector Ready for data, used for retiming Positive voltage pin, decoupled to GND
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and then to C7. The output from C7 presented at J1-8 is finally coupled to the output transformer on the Data-Alert board. Pins 3 and 4 of the MX604 are the logic control pins, M0 and M1, respectively. When the modem is first energized, it must be set up in the zero-power mode before normal operation begins. The zero-power mode is first configured by setting both M0 and M1 to 1, by the microprocessor on the main Data-Alert board when the program is first run. The BS2 microprocessor handles all initial zero-power mode setup and, subsequently, the logic control of the MX604, to next place the MX604 in the TX mode. Once in the TX mode the modem chip is ready to receive alarm data information. When the modem is ready for regular operation, M1 must be set for 0 and M0 is set for 1. The STAMP 2 (BS2) is used to first set up the zero-power mode during initialization; the BS2 then switches to the TX mode in order to send out the serial information to the alarm central terminal. In this application only the TX mode is used.
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Real-Time Clock Chip
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Up to this point we have talked only about the modem chip and not the real-time clock chip. The NJ6355 real-time clock chip at U1 performs the important time reporting function on
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282 DATA-ALERT
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the modem module. The real-time clock is used to report the actual time of the triggered event to the remote Data-Term data terminal. The real-time clock requires only a few external components to operate. The 32,768-Hz crystal is fundamental to the operation of U1. Resistor R1 is used to protect the data output line, while resistor R2 is used hold U1 inactive while the microprocessor resets. Bypass capacitor C1 is connected from the pin 8 to ground. Both the MX604 modem and real-time clock chips are shown in Fig. 21-7, which shows the modem board.
Modem Module Operation
The operation of the modem module is quite straightforward. Once the Data-Alert has been triggered by an event, the Data-Alert board begins dialing the phone number programmed. The Data-Alert waits for a number of seconds to establish the phone connection. Once the connection has been made, the Data-Alert again waits a few more seconds and then begins sending a single FSK tone for 10 seconds followed by the alarm message of the particular channel that was activated. Once the alarm message has been sent, the microcontroller disconnects the telephone line and the system is reset. Now the Data-Alert is ready for the next event, and one complete alarm cycle has been completed. The diagram in Fig. 21-8 depicts the modem module connection to the main Data-Alert circuit board. The modem module has a 10-pin male header, which is used for the main connections between the Data-Alert and the modem board. Note that the modem module plugs into the right or outside row of female header pins on the main Data-Alert board. The modem module also has some outboard connects. On the top left side of the modem board, above the 10-pin header, is a 4-pin header. This 4-pin header connects the clock chip at U1 to the auxiliary input header (AUX) on the main Data-Alert board. Pin J3-1 of the modem module goes to pin J3-1 on the main Data-Alert board and so on, as shown. The modem control lines M0 and M1 at the bottom of the modem module board are connected to the J4-3 and J4-2, respectively. Power for the modem module is obtained from the main Data-Alert board. Your modem module is now almost ready. Once connected to the main Data-Alert board, you are now ready to test the Data-Alert with the modem module. Connect the programing cable to the Data-Alert and apply power to the board. Next, load the DATA.BS2 program (Listing 21-1) to the Data-Alert. Connect the Data-Alert to the phone line, pick up the phone, and trigger one of the Data-Alert input channels. You should be hearing the Data-Alert trying to dial the phone number programmed into the Data-Alert. After about 10 seconds you should hear a steady tone from the modem and then you should hear the serial alarm message coming from the modem. Once the message is sent, a hangup message is sent and the Data-Alert recycles for the next event. Your modem module is now complete and ready to use.
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