20
Connections
3.5.2 Interface Signals
The GPIB (IEEE-488) interface system consists of 16 signal lines and 8 ground
lines. The 16 signal lines are divided into 3 groups (8 data lines, 3 handshake
lines, and 5 interface management lines). See table 3-4 for the signal
assignments.
Table 3-4 GPIB Signal Assignments
Pin # Designation Type
1 DI01 Data
2 DI02 Data
3 DI03 Data
4 DI04 Data
5 EOI Management
6 DAV Handshake
7 NRFD Handshake
8 NDAC Handshake
9 IFC Management
10 SRQ Management
11 ATN Management
12 SHIELD Ground
13 DI05 Data
14 DI06 Data
15 DI07 Data
16 DI08 Data
17 REN Management
18 GND (DAV) Ground
19 GND (NRFD) Ground
20 GND (NDAC) Ground
21 GND (IFC) Ground
22 GND (SRQ) Ground
23 GND (ATN) Ground
24 SIGNAL GROUND Ground
3.5.3 Data Lines
The lines DIO1 through DIO8 are used to transfer addresses, control
information and data. The formats for addresses and control bytes are defined
by the IEEE-488 standard. Data formats are undefined and may be ASCII (with
or without parity) or binary. DIO1 is the Least Significant Bit (note that this
corresponds to bit 0 on most computers).