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Paper sensor querying command (#242)

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The DLE EOT command allows querying the status of several features of
the printer.
Added to the online/offline status developed in #237, this commit adds a
paper sensor querying.

Tested with an Epson TM-T20II, which only has an end-paper sensor. The
near-end paper sensor should be tested with a compatible printer.
However, the implementation is quite straight-forward.
This commit is contained in:
csoft2k
2017-07-27 23:05:50 +02:00
committed by Patrick Kanzler
parent c7080165a7
commit 1f57b04974
2 changed files with 33 additions and 6 deletions
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30
src/escpos/escpos.py
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@@ -36,6 +36,7 @@ from .constants import HW_RESET, HW_SELECT, HW_INIT
from .constants import CTL_VT, CTL_CR, CTL_FF, CTL_LF, CTL_SET_HT, PANEL_BUTTON_OFF, PANEL_BUTTON_ON
from .constants import TXT_STYLE
from .constants import RT_STATUS_ONLINE, RT_MASK_ONLINE
from .constants import RT_STATUS_PAPER, RT_MASK_PAPER, RT_MASK_LOWPAPER, RT_MASK_NOPAPER
from .exceptions import BarcodeTypeError, BarcodeSizeError, TabPosError
from .exceptions import CashDrawerError, SetVariableError, BarcodeCodeError
@@ -754,19 +755,40 @@ class Escpos(object):
else:
self._raw(PANEL_BUTTON_OFF)
def query_status(self):
def query_status(self, mode):
""" Queries the printer for its status, and returns an array of integers containing it.
:param mode: Integer that sets the status mode queried to the printer.
RT_STATUS_ONLINE: Printer status.
RT_STATUS_PAPER: Paper sensor.
:rtype: array(integer)"""
self._raw(RT_STATUS_ONLINE)
self._raw(mode)
time.sleep(1)
status = self._read()
return status or [RT_MASK_ONLINE]
return status
def is_online(self):
""" Queries the printer its online status.
When online, returns True; False otherwise.
:rtype: bool: True if online, False if offline."""
return not (self.query_status()[0] & RT_MASK_ONLINE)
status = self.query_status(RT_STATUS_ONLINE)
if len(status) == 0:
return False
return not (status & RT_MASK_ONLINE)
def paper_status(self):
""" Queries the printer its paper status.
Returns 2 if there is plenty of paper, 1 if the paper has arrived to
the near-end sensor and 0 if there is no paper.
:rtype: int: 2: Paper is adequate. 1: Paper ending. 0: No paper."""
status = self.query_status(RT_STATUS_PAPER)
if len(status) == 0:
return 2
if (status[0] & RT_MASK_NOPAPER == RT_MASK_NOPAPER):
return 0
if (status[0] & RT_MASK_LOWPAPER == RT_MASK_LOWPAPER):
return 1
if (status[0] & RT_MASK_PAPER == RT_MASK_PAPER):
return 2
class EscposIO(object):