Tag: computer

Apparaat – RS232 – Seriële communicatie

Het volgende voorbeeld laat zien hoe je HEX strings naar een serieel RS232 apparaat stuurt en dan het “antwoord” uit kan lezen in HEX strings. C++ / Arduino

#include <SoftwareSerial.h>

byte command[2] = {0xAA, 0x41};
byte response[5]; 

SoftwareSerial rs232device(10, 11, SERIAL_8N1); // TX, RX.

void setup() {
  Serial.begin(9600);
  rs232device.begin(9600); 
}

void loop() {
  rs232device.write(command, sizeof(command));
  rs232device.readBytes(response, 5);

  Serial.print(response[0], HEX);Serial.print(" ");
  Serial.print(response[1], HEX);Serial.print(" ");
  Serial.print(response[2], HEX);Serial.print(" ");
  Serial.print(response[3], HEX);Serial.print(" ");
  Serial.println(response[4], HEX);
  delay(500);
}

#include <SoftwareSerial.h>

byte command[2] = {0xAA, 0x41};

byte response[5];

SoftwareSerial rs232device(10, 11, SERIAL_8N1); // TX, RX.

void setup() {

Serial.begin(9600);

rs232device.begin(9600);

}

void loop() {

rs232device.write(command, sizeof(command));

rs232device.readBytes(response, 5);

Serial.print(response[0], HEX);Serial.print(" ");

Serial.print(response[1], HEX);Serial.print(" ");

Serial.print(response[2], HEX);Serial.print(" ");

Serial.print(response[3], HEX);Serial.print(" ");

Serial.println(response[4], HEX);

delay(500);

}

Python / Raspberry Pi

#!/usr/bin/env python

import serial
import time

#-------------------------------------------------------------------------------

def ByteToHex( byteStr ):
    """
    Convert a byte string to it's hex string representation e.g. for output.
    """
    
    # Uses list comprehension which is a fractionally faster implementation than
    # the alternative, more readable, implementation below
    #   
    #    hex = []
    #    for aChar in byteStr:
    #        hex.append( "%02X " % ord( aChar ) )
    #
    #    return ''.join( hex ).strip()        

    return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip()

#-------------------------------------------------------------------------------

def HexToByte( hexStr ):
    """
    Convert a string hex byte values into a byte string. The Hex Byte values may
    or may not be space separated.
    """
    # The list comprehension implementation is fractionally slower in this case    
    #
    #    hexStr = ''.join( hexStr.split(" ") )
    #    return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \
    #                                   for i in range(0, len( hexStr ), 2) ] )
 
    bytes = []

    hexStr = ''.join( hexStr.split(" ") )

    for i in range(0, len(hexStr), 2):
        bytes.append( chr( int (hexStr[i:i+2], 16 ) ) )

    return ''.join( bytes )

#-------------------------------------------------------------------------------

# USB D- = RXD TTL STICK
# USB D+ = TXD TTL STICK

### POORT INSTELLINGEN
ser = serial.Serial()
ser.port = "/dev/ttyUSB0"
ser.baudrate = 9600
ser.parity=serial.PARITY_NONE
ser.stopbits=serial.STOPBITS_ONE
ser.bytesize=serial.EIGHTBITS
ser.timeout=1

try: 
    ser.open()
    print("Connected to: " + ser.portstr)
except Exception, e:
    print "error open serial port: " + str(e)
    exit()

while 1:
  ### METHODE #1
  ser.write([0xAA, 0x41])

  ### METHODE #2
  #ser.write(serial.to_bytes([0xAA,0x41]))

  ### METHODE #3
  #ser.write("\xAA\x41")

  ### METHODE #4
  #ser.write(chr(0xAA))
  #ser.write(chr(0x41))

  ### METHODE #5
  #msg = bytearray([0xAA, 0x41])
  #ser.write(msg)

  #data = ser.read(8) ### AANTAL BYTES LEZEN
  data = ser.readline() ## HELE LIJN LEZEN
  #data = ser.readall() ### ALLES LEZEN

  print "SIZE: ", len(data)
  print "RAW: " + data
  print "HEX1: " + ByteToHex(data)
  print "HEX2: " + data.encode('hex')

  time.sleep(2)

#!/usr/bin/env python

import serial

import time

#-------------------------------------------------------------------------------

def ByteToHex( byteStr ):

"""

Convert a byte string to it's hex string representation e.g. for output.

"""

# Uses list comprehension which is a fractionally faster implementation than

# the alternative, more readable, implementation below

# hex = []

# for aChar in byteStr:

# hex.append( "%02X " % ord( aChar ) )

# return ''.join( hex ).strip()

return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip()

#-------------------------------------------------------------------------------

def HexToByte( hexStr ):

"""

Convert a string hex byte values into a byte string. The Hex Byte values may

or may not be space separated.

"""

# The list comprehension implementation is fractionally slower in this case

# hexStr = ''.join( hexStr.split(" ") )

# return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \

# for i in range(0, len( hexStr ), 2) ] )

bytes = []

hexStr = ''.join( hexStr.split(" ") )

for i in range(0, len(hexStr), 2):

bytes.append( chr( int (hexStr[i:i+2], 16 ) ) )

return ''.join( bytes )

#-------------------------------------------------------------------------------

# USB D- = RXD TTL STICK

# USB D+ = TXD TTL STICK

### POORT INSTELLINGEN

ser = serial.Serial()

ser.port = "/dev/ttyUSB0"

ser.baudrate = 9600

ser.parity=serial.PARITY_NONE

ser.stopbits=serial.STOPBITS_ONE

ser.bytesize=serial.EIGHTBITS

ser.timeout=1

try:

ser.open()

print("Connected to: " + ser.portstr)

except Exception, e:

print "error open serial port: " + str(e)

exit()

while 1:

### METHODE #1

ser.write([0xAA, 0x41])

### METHODE #2

#ser.write(serial.to_bytes([0xAA,0x41]))

### METHODE #3

#ser.write("\xAA\x41")

### METHODE #4

#ser.write(chr(0xAA))

#ser.write(chr(0x41))

### METHODE #5

#msg = bytearray([0xAA, 0x41])

#ser.write(msg)

#data = ser.read(8) ### AANTAL BYTES LEZEN

data = ser.readline() ## HELE LIJN LEZEN

#data = ser.readall() ### ALLES LEZEN

print "SIZE: ", len(data)

print "RAW: " + data

print "HEX1: " + ByteToHex(data)

print "HEX2: " + data.encode('hex')

time.sleep(2)

SIZE:  7
RAW: WAWA
HEX1: 57 41 57 41 00 00 00
HEX2: 57415741000000

SIZE: 7

RAW: WAWA

HEX1: 57 41 57 41 00 00 00

HEX2: 57415741000000

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