Ieee-488 Interface Connector - Lakeshore 335 User Manual

140 c 8: Service
HAPTER
8.10.1 IEEE-488
Interface Connector
Model 335 Temperature Controller
Connect to the IEEE-488 Interface connector on the Model 335 rear with cables spec-
ified in the IEEE-488 standard. The cable has 24 conductors with an outer shield. The
connectors are 24-way Amphenol 57 Series (or equivalent) with piggyback recepta-
cles 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 m for each device on the bus, or 20 m
maximum. The Model 335 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 8-7 shows the IEEE-488 interface connector pin location and signal names as
viewed from the Model 335 rear panel.
12 11
24 23
Pin Symbol
1 DIO 1
2 DIO 2
3 DIO 3
4 DIO 4
5 EOI
6 DAV
7 NRFD
8 NDAC
9 IFC
10 SRQ
11 ATN
12 SHIELD
13 DIO 5
14 DIO 6
15 DIO 7
16 DIO 8
17 REN
18 GND 6 Ground wire: twisted pair with DAV
19 GND 7 Ground wire: twisted pair with NRFD
20 GND 8 Ground wire: twisted pair with NDAC
21 GND 9
22 GND 10 Ground wire: twisted pair with SRQ
23 GND 11 Ground wire: twisted pair with ATN
24 GND
TABLE 8-6 IEEE-488 rear panel connector details
10 9 8 7 6 5
22 21 20 19 18 17
FIGURE 8-7 IEEE-488 interface
Description
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
No 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 IFC
Logic ground
4 3 2 1
16 15 14 13