python-gpib provides Gpib.py (see end of post) for Linux. I am trying to use the method called read. I usually use it without arguments (the default length being 512). However, I am trying to read in a string with some 16,000 comma separated floating point numbers.
So, I have to pass a length parameter much much larger than 512. As is stands, the default read takes in only about 35-40 numbers, so I need about 512/35*16000 ~= 230,000. Not being sure if I could make python read in something that big, I started small - with 1024. This produces an list of numbers that has a malformed first number (I get 88309e-9 instead of something like 6.788309e-9.). Could this be a bug ? Second, does the length need to be a power of two for some reason ? python-gpib is an excellent library, but it suffers from an utter lack of documentation. ------------------------ Gpib.py ----------------------------- import gpib RQS = (1<<11) SRQ = (1<<12) TIMO = (1<<14) class Gpib: def __init__(self,name='gpib0'): self.id = gpib.find(name) def write(self,str): gpib.write(self.id, str) def writebin(self,str,len): gpib.writebin(self.id,str,len) def read(self,len=512): self.res = gpib.read(self.id,len) return self.res def readbin(self,len=512): self.res = gpib.readbin(self.id,len) return self.res def clear(self): gpib.clear(self.id) def wait(self,mask): gpib.wait(self.id,mask) def rsp(self): self.spb = gpib.rsp(self.id) return self.spb def trigger(self): gpib.trg(self.id) def ren(self,val): gpib.ren(self.id,val) def ibsta(self): self.res = gpib.ibsta() return self.res def ibcnt(self): self.res = gpib.ibcnt() return self.res def tmo(self,value): return gpib.tmo(self.id,value) -- http://mail.python.org/mailman/listinfo/python-list