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Add GPIBVisaDriver.read_block #14

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Add GPIBVisaDriver.read_block #14

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17 changes: 17 additions & 0 deletions lantz/visa.py
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Original file line number Diff line number Diff line change
Expand Up @@ -207,6 +207,23 @@ def raw_recv(self, size):

return data

def read_block(self):
"""Read a block of data in IEEE488.2 # format

Read a block of data with the format
#<D><length><data>
<D>: number of digits in <length> (ASCII digit)
<length>: number of bytes in <data> (ASCII digits)
"""
header = self.raw_recv(1)
if header != b'#':
raise Exception('Unexpected block header: {}'.format(
str(header[0])))
nlength = int(self.raw_recv(1))
length = int(self.raw_recv(nlength))
return self.raw_recv(length)


class TCPVisaDriver(MessageVisaDriver):
pass

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