pyserial - escape codes transportation

[ObservantP]

need help. newbie. pyserial and  dot matrix printer.
issue- escape codes arrive at printer ( verified from hex dump) but do
not get applied.
printer make/model STAR POS printer SP500.
oddly, printer commands not initiated with the escape code .i.e. a
symbol, work fine.


import serial
ser=serial.Serial(0)

ser.bytesize=7
ser.timeout=1
ser.dsrdtr=1
ser.write('PySerial'+'\n')
ser.write('Star SP500'+'\n')



#Double Width On   14   SO =             Or ESC W 1 / 0
#                     Off  20   DC4= 

ser.write(''     +'Double Width-Symbol\n')  #Good
ser.write(''     +'Reset\n')                         #Good
ser.write('\n')                                          #Good

ser.write('Xw1\n'+'Double Width-ESC\n')    #Nope ( Nor CHR(027)
'\x1b'
ser.write('Xw0\n'+'Reset\n')                       #X is symbol not
showing up here.
ser.write('\n')
ser.write('\n')
ser.write('\n')


ser.close()