Data and Command Messages

GPIB Analyzer

Data and Command Messages

Eight data lines, DIO1 through DIO8, carry both data messages and command messages. All commands and most data use the 7-bit ASCII or ISO code set, in which case the eighth bit, DIO8, is either not used or used for parity. Command messages are sent with the ATN line asserted; data messages are sent with the ATN line unasserted.