GPIB Polling
One is called parallel polling and the other is serial. Parallel polling can only operate with up to eight instruments. This is because each of the devices will return a status bit one of the eight data lines.
Is GPIB serial?
Serial, RS232 GPIB Instrument Control Device—The GPIB‑RS232 is an IEEE 488 controller device for computers with an RS232 port.
Is GPIB parallel?
IEEE 488 is an 8-bit, electrically parallel bus which employs sixteen signal lines — eight used for bi-directional data transfer, three for handshake, and five for bus management — plus eight ground return lines.
