User`s manual

7800 Series Hysteresisgraph System User's Manual
Installation 3-11
3.3 IEEE-488 INTERFACE CONNECTOR
The instruments in the 7800 Series Hysteresisgraph communicate with the computer via the IEEE-488 Interface.
The cables used conform with the IEEE-488-1978 standard document, which specifies a cable with 24 conductors
with an outer shield. The connectors are 24-way Amphenol 57 Series (or equivalent) with piggyback receptacles to
allow daisy-chaining in multiple device systems. The connectors are secured in the receptacles by two captive
locking screws with metric threads. The 7800 Series uses two 1 meter long cables and one 2 meter long cable.
The total length of cable allowed in a system is 2 meters for each device on the bus, or 20 meters maximum.
A system may be composed of up to 15 devices. Figure 3-8 shows the IEEE-488 Interface connector pin location
and signal names as viewed from the rear panel.
1112 10987654321
2324 22 21 20 19 18 17 16 15 14 13
IEEE-488 INTERFACE
SH1 AH1 T5 L4 SR1 RL1 PP0 DC1 DT0 C0 E1
IEEE.eps
PIN SYMBOL DESCRIPTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DIO1
DIO2
DIO3
DIO4
EOI
DAV
NRFD
NDAC
IFC
SRQ
ATN
SHIELD
DIO5
DIO6
DIO7
DIO8
REN
GND 6
GND 7
GND 8
GND 9
GND 10
GND11
GND
Data Input/Output Line 1
Data Input/Output Line 2
Data Input/Output Line 3
Data Input/Output Line 4
End Or Identify
Data Valid
Not Ready For Data
Not Data Accepted
Interface Clear
Service Request
Attention
Cable Shield
Data Input/Output Line 5
Data Input/Output Line 6
Data Input/Output Line 7
Data Input/Output Line 8
Remote Enable
Ground Wire – Twisted pair with DAV
Ground Wire – Twisted pair with NRFD
Ground Wire – Twisted pair with NDAC
Ground Wire – Twisted pair with IFC
Ground Wire – Twisted pair with SRQ
Ground Wire – Twisted pair with ATN
Logic Ground
Figure 3-8. IEEE-488 Connector Details