barcode generator vb.net code STAMP 2 INPUT/OUTPUT INTERFACING in Software

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34 STAMP 2 INPUT/OUTPUT INTERFACING
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'control.bs2 1 (BS2 to RS-485 interface via a SN75176 chip) ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' This program interfaces a BASIC Stamp 2 to an RS-485 network using the SN75176 Differential Bus Transceiver chip from TI. This program is meant to operate with another STAMP 2 connected to the same RS-485 network and is running the slave.bs2 program. Pins 2 and 3 of the SN75176 chip are connected to pin 0 of the Stamp 2. Pins 1 and 4 of the SN75176 chip are connected to Pin 1 of the Stamp 2. This program expects an active-low button or switch to be connected to pin 2 of the Stamp2. When the button or switch sets pin 2 low, the character "L" is sent over the RS-485 network. When the button or switch sets pin 2 high then the character "H" is sent over the network. Note. Setting pin 0 on the Stamp 2 high puts the SN75176 into transmit mode. So any serial data transmitted out of pin 1 on the Stamp 2 will be transmitted over the RS-485 network.
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btnWk var byte 'Workspace for the BUTTON command input 2 'Make pin 2 the button input output 0 'Make pin 0 an output high 0 'Put the SN75176 into transmit mode if(in2<>1)then loop1: 'If pin 2 is initially High, send... SEROUT 1,16468,1,["H"] '... an "H" over the RS-485 network loop1: BUTTON 2,0,255,0,btnWk,1,preloop2 'Wait till pin 2 is low goto loop1 preloop2: SEROUT 1,16468,1,["L"] 'Send a "L" over the RS-485 network. loop2: BUTTON 2,1,255,250,btnWk,1,loop_again 'Wait till pin 2 goes high goto loop2 loop_again: SEROUT 1,16468,1,["H"] 'Send an "H" over the RS-485 network. goto loop1: 'Loop forever
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CONTROL.BS2 program.
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NETWORKING STAMP 2 S 35
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'slave.bs2 ' (BS2 to RSS485 interface via a SN75176 chip) ' This program interfaces a BASIC Stamp 2 to an RS-485 network ' using the SN75176 Differential Bus Tranceiver chip from ' TI. This program is meant to operate with another Stamp 2 ' connected to the same RS-485 network and is running the ' control.bs2 program. ' Pins 2 and 3 of the SN75176 chip are connected to pin 0 of ' the Stamp 2. Pins 1 and 4 of the SN75176 chip are ' connected to Pin 1 of the Stamp 2. ' This program expects an LED and resistor in series to be connected to ' pin 2 of the Stamp 2. When an "H" comes across the RS-485 network ' pin 2 is set high, turning on the LED. When an "L" is received ' pin 2 of the Stamp 2 is turned off. ' Note: Setting pin 0 on the Stamp 2 low puts the SN75176 into ' receive mode. So any serial data received on pin 1 of the ' Stamp 2 will be read in with the SERIN command. string var byte 'Used to hold the "H" or "L" output 2 'Make pin 2 the LED connected pin. output 0 'Make pin 0 an output pin. low 0 'Put the SN75176 into receive mode. loop1: SERIN 1,16468,60000,loop1,[string] 'Read a byte of data coming in. if(string<>"H")then is_low 'If H, then ... high 2 '... set pin 2 high, turning on LED goto loop1 is_low: 'If not an H, then turn off the LED low 2 goto loop1 'Loop forever
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CONTROL.BS2 program (Continued).
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SERIAL BUILDING BLOCKS
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