User`s manual

66 PCL-848AB User's Manual
2) TALKER. A device capable of transmitting data to other devices. Typical talkers
are voltmeters,counters, audio analyzers and many other measurement instruments.
3) CONTROLLER. A device capable of managing communications over the IEEB-488
bus such as addressing and sending commands. A PC with the IEEE-488 interface is
typically a controller.
An IEEE-488 bus system allows only one device at a time to active talker, but it
allows multiple listeners receiving the same data at the same time. Only one controller
can be active at a time.
9.2. Bus Structure
An IEEE-488 bus has 24 lines including 7 ground return lines and one shield line. The
16 lines with signals are 8 data lines, 3 handshake lines and 5 management lines.
9.2.1. IEEE-488 Connector Pin Assignment
The IEEE-488 standard uses 24 pin ribbon connector as the standard and the signal
assignment is :
DATA Lines Pin No. MANAGEMENT Lines Pin No.
---------------------------------- -------------------------------------------------
DIO1 1 IFC 9
DI02 2 REN 17
DI03 3 ATN 11
DI04 4 SRQ 10
DI05 13 EOI 5
DI06 14
DI07 15 HANDS8AKE Lines Pin No.
DI08 16 -------------------------------------------------
DAV 6
NRFD 7
NDAC 8