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Addressable Serial-to-Parallel Converter
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National Control Devices has a number of very interesting specially programmed microprocessor chips for simple serial control applications. The first device in our discussion is the addressable serial-to-parallel converter. The NCD-101 makes for a powerful control circuit with many potential applications. The NCD-101, shown in Fig. 3-12, was designed to perform high-speed serial-to-parallel conversions. The NCD-101 can be commanded from any serial source either from a terminal program, from an RF system, from a STAMP 2, or from IR control. By simply sending three commands, you can readily control eight devices, and, by cascading seven of the NCD-101s, you can control up to 56 devices. The NCD-101 can be made to operate at three different baud rates, from 1200 to
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'irdecode.bs2 'revision 1. Feb 2000 Henry Arnold 'must be used with rev 3.0 SONY.c Decoder IC '************************************************************************** Sony_in Con 10 'ir serial input from sensor delay Con 50 'Pause between pulses and ir timeout in ms mode_r Con 396 'Ir serial port mode 2400 baud ir_data Con byte 'Infrared input character *****************Start of main loop ****************************************** check_ir Serin SONY_in,mode_r,delay,check_ir,[ir_data] 'Read ir port timeout Debug dec Ir_data ' used for debugging only Got check_ir
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Figure 3-12 Serial-to-parallel converter.
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9600 baud, simply by substituting different ceramic resonators. The NCD-101 is an addressable device that is programmed by the three switches, N1, N2, and N3, at pins 1, 17, and 18. Each converter chip has its own specific address, and when linked together forms its own network; see the address programming chart in Table 3-2. A serial signal is fed to the converter on pin 2, and with simple commands you can control each of the eight outputs on each of the converter chips independently. The NCD-101
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TABLE 3-2
NCD-101 ADDRESSABLE SERIAL-TO-PARALLEL CONVERTER NAME/ADDRESS PROGRAMMING
NAME
0 1 2 3 4 5 6
0 0 0 0 1 1 1
0 0 1 1 0 0 1
0 1 0 1 0 1 0
requires only five external components for the system. Three 10-k resistors are used for the address pins, and three jumpers or switches can be used for programming the converter chip. A crystal resonator is used to establish the speed or baud of the device, and a series resistor is used to accept the serial signals on pin 2. The serial-to-parallel converter is powered from a 5-Vdc source at pins 3 and 4. In order to chain a number of converter chips together, you simply have to link each of the chips together via the serial input pins. When combining more NCD-101s together to form a larger control system, you must note that the RS-232 ground is shared among the converter chips. In order to talk to the NCD-101, you will need to send it simple serial commands, which are shown in Table 3-3.
Addressable Parallel-to-Serial Encoder
The NCD addressable parallel-to-serial encoder is a very powerful special-purpose serial control device. The NCD-102 can monitor 8-bit parallel input from a single 8-bit word or it can monitor eight different single binary input signals, and when queried with a serial word will output a status word indicating the state of the eight inputs, as shown in Fig. 3-13. The NCD102 requires only three resistors and a ceramic resonator at pins 15 and 16. The NCD-102 can run at four different baud rates, from 1200 to 9600. Up to four NCD-102s can be attached to a single RS-232 serial port connection, providing a total of 32 input bits or channels. The name/address programming pins at 17 and 18 are used to set up each of the encoders in a larger system. Table 3-4 indicates the programming configurations. The NCD-102 is a polled device, operating in a speak when spoken to mode. The name jumpers determine the input s identity on the serial port. When a valid name and carriage return are received by the NCD102, the device reads the current status of the eight inputs and replies with a byte of data. When four NCD-102s are connected together, the ASCII outputs must be ORed together. The NCD-102 is queried via the serial input connection at pin 2 through a 22-k resistor, which
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