timeout setting doesn't seem to get through

[gpetrowitsch]

Hi, I'm an enthusiastic user of your invaluable library. Thanks for making and maintaining it!!!
I'm opening this issue because I try to set a timeout for an instrument connected via serial port (resource is ASRL42::INSTR). The constructor gets the value 50000 in the key "timeout", but when I single step through the construction, I can't find any occasion where this value would actually be used. And when I send a loooong command string, which would need this prolongued timeout, the instrument reports an error; so it looks like the timeout is not being used.
Can you help?
Regards, Gerhard