Lake Shore 625, User Manual

Page: 114 / 132

Lake Shore Model 625 Superconducting MPS User’s Manual
7-12 Service
7.12.2 IEEE-488 Interface Connector
Connect to the IEEE-488 Interface connector on the Model 625 rear with cables specified in the IEEE-488-1978 standard
document. The cable has 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 total length of cable allowed in a system is 2 meters for each device on the bus, or 20 meters maximum. The
Model 625 can drive a bus of up to 10 devices. A connector extender is required to use the IEEE-488 Interface and Relay
Terminal Block at the same time. Figure 7-8 shows the IEEE-488 Interface connector pin location and signal names as
viewed from the Model 625 rear panel.
IEEE Connector.bmp
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
DIO 1
DIO 2
DIO 3
DIO 4
EOI
DAV
NRFD
NDAC
IFC
SRQ
ATN
SHIELD
DIO 5
DIO 6
DIO 7
DIO 8
REN
GND 6
GND 7
GND 8
GND 9
GND 10
GND 11
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 7-8. IEEE-488 Rear Panel Connector Details