I understand that a GPIB slave needs to respond within a certain time to avoid a timeout error from the master.
However, if I'm the slave, and the command the master has sent is going to take a very long time to to perform, what can I do on the GPIB to tell the master that I'm still processing and to not move on (and not timeout)?
According to the datasheet for the GPIB chip (NI NAT9914 / TI TMS9914A ) there is a GPIB hardware handshake line for 'Not Ready for Data', but how can I hold off the bus once I received the data?