94 lines
4.5 KiB
Python
94 lines
4.5 KiB
Python
""" ESC/POS Commands (Constants) """
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import binascii as ba
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#{ Control characters
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# as labelled in http://www.novopos.ch/client/EPSON/TM-T20/TM-T20_eng_qr.pdf
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NUL = ba.hexlify(b'\x00')
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EOT = ba.hexlify(b'\x04')
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ENQ = ba.hexlify(b'\x05')
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DLE = ba.hexlify(b'\x10')
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DC4 = ba.hexlify(b'\x14')
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CAN = ba.hexlify(b'\x18')
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ESC = ba.hexlify(b'\x1b')
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FS = ba.hexlify(b'\x1c')
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GS = ba.hexlify(b'\x1d')
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#{ Feed control sequences
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CTL_LF = ba.hexlify(b'\n') # Print and line feed
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CTL_FF = ba.hexlify(b'\f') # Form feed
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CTL_CR = ba.hexlify(b'\r') # Carriage return
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CTL_HT = ba.hexlify(b'\t') # Horizontal tab
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CTL_VT = ba.hexlify(b'\v') # Vertical tab
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#{ Printer hardware
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HW_INIT = ESC + ba.hexlify(b'@') # Clear data in buffer and reset modes
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HW_SELECT = ESC + ba.hexlify(b'=\x01') # Printer select
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HW_RESET = ESC + ba.hexlify(b'\x3f\x0a\x00') # Reset printer hardware
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# (TODO: Where is this specified?)
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#{ Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
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_CASH_DRAWER = lambda m, t1='', t2='': ESC + ba.hexlify(b'p' + m + chr(t1) + chr(t2))
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CD_KICK_2 = _CASH_DRAWER(b'\x00', 50, 50) # Sends a pulse to pin 2 []
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CD_KICK_5 = _CASH_DRAWER(b'\x01', 50, 50) # Sends a pulse to pin 5 []
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#{ Paper Cutter
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_CUT_PAPER = lambda m: GS + ba.hexlify(b'V' + m)
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PAPER_FULL_CUT = _CUT_PAPER(b'\x00') # Full cut paper
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PAPER_PART_CUT = _CUT_PAPER(b'\x01') # Partial cut paper
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#{ Text format
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# TODO: Acquire the "ESC/POS Application Programming Guide for Paper Roll
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# Printers" and tidy up this stuff too.
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TXT_NORMAL = ESC + ba.hexlify(b'!\x00') # Normal text
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TXT_2HEIGHT = ESC + ba.hexlify(b'!\x10') # Double height text
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TXT_2WIDTH = ESC + ba.hexlify(b'!\x20') # Double width text
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TXT_4SQUARE = ESC + ba.hexlify(b'!\x30') # Quad area text
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TXT_UNDERL_OFF = ESC + ba.hexlify(b'\x2d\x00') # Underline font OFF
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TXT_UNDERL_ON = ESC + ba.hexlify(b'\x2d\x01') # Underline font 1-dot ON
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TXT_UNDERL2_ON = ESC + ba.hexlify(b'\x2d\x02') # Underline font 2-dot ON
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TXT_BOLD_OFF = ESC + ba.hexlify(b'\x45\x00') # Bold font OFF
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TXT_BOLD_ON = ESC + ba.hexlify(b'\x45\x01') # Bold font ON
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TXT_FONT_A = ESC + ba.hexlify(b'\x4d\x00') # Font type A
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TXT_FONT_B = ESC + ba.hexlify(b'\x4d\x01') # Font type B
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TXT_ALIGN_LT = ESC + ba.hexlify(b'\x61\x00') # Left justification
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TXT_ALIGN_CT = ESC + ba.hexlify(b'\x61\x01') # Centering
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TXT_ALIGN_RT = ESC + ba.hexlify(b'\x61\x02') # Right justification
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#{ Barcode format
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_SET_BARCODE_TXT_POS = lambda n: GS + ba.hexlify(b'H' + n)
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BARCODE_TXT_OFF = _SET_BARCODE_TXT_POS(b'\x00') # HRI barcode chars OFF
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BARCODE_TXT_ABV = _SET_BARCODE_TXT_POS(b'\x01') # HRI barcode chars above
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BARCODE_TXT_BLW = _SET_BARCODE_TXT_POS(b'\x02') # HRI barcode chars below
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BARCODE_TXT_BTH = _SET_BARCODE_TXT_POS(b'\x03') # HRI both above and below
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_SET_HRI_FONT = lambda n: GS + b'f' + n
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BARCODE_FONT_A = _SET_HRI_FONT(b'\x00') # Font type A for HRI barcode chars
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BARCODE_FONT_B = _SET_HRI_FONT(b'\x01') # Font type B for HRI barcode chars
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BARCODE_HEIGHT = GS + ba.hexlify(b'h') # Barcode Height [1-255]
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BARCODE_WIDTH = GS + ba.hexlify(b'w') # Barcode Width [2-6]
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#NOTE: This isn't actually an ESC/POS command. It's the common prefix to the
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# two "print bar code" commands:
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# - "GS k <type as integer> <data> NUL"
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# - "GS k <type as letter> <data length> <data>"
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# The latter command supports more barcode types
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_SET_BARCODE_TYPE = lambda m: GS + ba.hexlify(b'k' + m)
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BARCODE_UPC_A = _SET_BARCODE_TYPE(b'\x00') # Barcode type UPC-A
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BARCODE_UPC_E = _SET_BARCODE_TYPE(b'\x01') # Barcode type UPC-E
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BARCODE_EAN13 = _SET_BARCODE_TYPE(b'\x02') # Barcode type EAN13
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BARCODE_EAN8 = _SET_BARCODE_TYPE(b'\x03') # Barcode type EAN8
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BARCODE_CODE39 = _SET_BARCODE_TYPE(b'\x04') # Barcode type CODE39
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BARCODE_ITF = _SET_BARCODE_TYPE(b'\x05') # Barcode type ITF
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BARCODE_NW7 = _SET_BARCODE_TYPE(b'\x06') # Barcode type NW7
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#{ Image format
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# NOTE: _PRINT_RASTER_IMG is the obsolete ESC/POS "print raster bit image"
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# command. The constants include a fragment of the data's header.
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_PRINT_RASTER_IMG = lambda data: GS + b'v0' + data
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S_RASTER_N = _PRINT_RASTER_IMG(b'\x00') # Set raster image normal size
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S_RASTER_2W = _PRINT_RASTER_IMG(b'\x01') # Set raster image double width
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S_RASTER_2H = _PRINT_RASTER_IMG(b'\x02') # Set raster image double height
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S_RASTER_Q = _PRINT_RASTER_IMG(b'\x03') # Set raster image quadruple
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