如何在python escpos中读取ASB状态

Question

我想在python escpos中读取ASB和其他状态结果。我想_read((方法可以工作，但我得到一个"AttributeError:'Serial'对象没有属性'_read'"错误。我已经用inspect验证了_read((方法的存在。

关于如何在python escpos中读取状态，有什么建议吗？

Answer 1

请尝试将GS a命令指定为query_status()方法中的参数并调用它。

GS a

[Name]
Enable/disable Automatic Status Back (ASB)
[Format]
ASCII   GS  a   n
Hex     1D  61  n
Decimal 29  97  n
[Range]
n = 0 – 255
[Default]
n: different depending on the printers

请尝试为n指定0xFF。

query_status(mode(

查询打印机的状态，并返回包含它的整数数组。

参数：mode–整数，用于设置向打印机查询的状态模式。-RT_STATUS_ONLINE:打印机状态。-RT_STATUS_PARER：纸张传感器。返回类型：数组(整数(

defquery_status(self，mode(:

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(mode)
time.sleep(1)
status = self._read()
return status

def_raw(self，msg(：

def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self.device.write(self.out_ep, msg, self.timeout)

def_read(self(:

def _read(self):
""" Reads a data buffer and returns it to the caller. """
return self.device.read(self.in_ep, 16)

#状态命令

RT_STATUS = DLE + EOT
RT_STATUS_ONLINE = RT_STATUS +  b'x01'
RT_STATUS_PAPER = RT_STATUS +  b'x04'
RT_MASK_ONLINE = 8
RT_MASK_PAPER = 18
RT_MASK_LOWPAPER = 30
RT_MASK_NOPAPER = 114