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Modem Module Board
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The modem module allows your Data-Alert to report alarm conditions to the Data-Term display terminal. Each modem module uses a unique code that distinctly identifies itself to the your Data-Term unit. The modem module can also be used to report the exact time of the triggered event. Your Data-Term display unit can then log the various events from different Data-Alert systems located in different locations. The Data-Term display terminal also permits immediate alarm notification via X-10 ac power modules. Various sirens, lamps, etc., can be activated with the X-10 system. The Data-Alert is designed to monitor four different alarm channels or conditions such as motion monitors, temperature sensors, and door switches. Both the Data-Alert and Data-Term display terminal can be expanded to monitor more channels by modifying the software. The modem module is a small add-on daughter board that plugs into the main DataAlert system board. The modem module consists of three integrated circuits. The heart of the modem module is the MX604 1200-baud modem chip, which is animated by the BS2 controller in the Data-Alert. The second major component is the NJ6355 real-time clock chip, which is used to send the exact time of the event to the remote Data-Term display terminal, and an op-amp chip to amplify the outgoing signal from the modem chip. The MX604 modem chip requires only a few discrete components for operation. The modem chip is a full frequency-shift keying (FSK) modem with transmit and
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MODEM MODULE BOARD 279
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TABLE 21-1
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DATA-ALERT INPUT/OUTPUT CONNECTIONS ALARM INPUT TERMINALS AND HEADER BLOCK J1
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IT-1 IT-2 IT-3 IT-4 IT-5 IT-6 IT-7 IT-8 IT-9 IT-10
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J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J1-7 J1-8 J1-9 J1-10
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J2-1 J2-2 J2-3 J2-4 J2-5 J2-6 J2-7 J2-8 J2-9 J2-10
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9-Vdc input Ground IN1 input channel 1 IN2 input channel 2 IN3 input channel 3 IN4 input channel 4 Microphone enable Audio input mic 5-Vdc output N/C
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AUXILIARY INPUTS
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J3-1 J3-2 J3-3 J3-4
IN5 aux. input channel 5 IN6 aux. input channel 6 IN7 aux. input channel 7 IN8 aux. input channel 8
AUXILIARY OUTPUTS
J4-1 J4-2 J4-3
OT1 aux. output channel 1For external siren OT2 aux. output channel 2For external lamp OT3 aux. output channel 3Future use
SERIAL COMMUNICATION
J5-1 J5-2 J5-3 J5-4 J6-1 J6-2
RX TX ATN GND L1 L2
Pin 2 Pin 3 Pin 4 Pin 5 Phone line connection Phone line connection
RS232 RS232 RS232 RS232
DB-9S DB-9S DB-9S DB-9S
receive capabilities, but without the controller of a conventional modem. The MX604 contains an FSK modulator and demodulator as well as filters, buffers, and timing and logic control functions. The diagram in Fig. 21-5 illustrates the block diagram of the of the MX604 modem chip. The MX604 pinout diagram is shown in Fig. 21-6, and Table 21-2 depicts the pinout list for the MX604.
280 DATA-ALERT
XTAL/ CLOCK XTAL VDD VBIAS VSS RXAMPOUT RXIN
Xtal Osc and clock dividers Energy detect Mode control logic Receive filter and equalizer VBIAS Transmit filter and output buffer FSK demodulator Rx/Tx Data Re-timing FSK modulator
RXEQ
DET M1 M0
RXD CLK RDY TXD
TXOUT
Figure 21-5 MX604 block diagram.
5V C1 C2 C3 XTL
1 2 3 4 5 6 7 8
MX604
XTAL CLK/XTAL M0 M1 RXIN RXAMP TXOUT VSS VOD RDY DET RXD CLK TXD RXEQ VBIAS 16 15 14 13 12 11 10 9
C4 Figure 21-6 MX604 modem chip.
The ubiquitous 3.579-MHz color burst crystal at X2 is the brain of the modem chip that controls all the timing functions. The crystal is connected to pins 1 and 2 of the MX604, with two 18-pF capacitors connected across the crystal with a tap to ground. A bias capacitor is connected from pin 9 to ground, and a second 0.01- F bypass capacitor is connected from Vdd to ground. Resistor R3 is connected from pin 15 to Vdd on pin 16. The MX604 chip as well as the real-time clock chip at U1 are powered from the 5-V regulator on board the main Data-Alert system board. Power to the modem is applied to pins 12 and 16, while ground is applied to pin 8. The alarm data, i.e., ASCII alarm information, from each Data-Alert channel is fed to the modem on the TXD pin 11. The FSK-modulated output signal is sent out of the modem on the TXOUT pin 7. The FSK output is next fed to R4, which is coupled to U3, which acts as an output amplifier and signal conditioner. The output from U3 is fed first to R6
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