Lake Shore Model 331 Temperature Controller User’s Manual
CHAPTER 6
COMPUTER INTERFACE OPERATION
6.0 GENERAL
This chapter provides operational instructions for the computer interface for the Lake Shore Model 331
Temperature Controller. Either of the two computer interfaces provided with the Model 331 permit
remote operation. The first is the IEEE-488 Interface described in Paragraph 6.1. The second is the
Serial Interface described in Paragraph 6.2. The two interfaces share a common set of commands
detailed in Paragraph 6.3. Only one of the interfaces can be used at a time.
NOTE
: The remote interface of the Model 331 can be set to emulate a Lake Shore Model 330
Temperature Controller. Refer to Paragraph 4.20 to select 330 Emulation Mode. Refer
to your Model 330 User’s Manual for command syntax. The following Model 330
commands are not supported in 330 Emulation Mode: CUID?, CURV, CURV?, ECUR,
KCUR, and SCAL.
6.1
IEEE-488 INTERFACE (Model 331S Only)
The IEEE-488 Interface is an instrumentation bus with hardware and programming standards that
simplify instrument interfacing. The Model 331 IEEE-488 Interface complies with the IEEE-488.2-1987
standard and incorporates its functional, electrical, and mechanical specifications unless otherwise
specified in this manual.
All instruments on the interface bus perform one or more of the interface functions of TALKER,
LISTENER, or BUS CONTROLLER. A TALKER transmits data onto the bus to other devices. A
LISTENER receives data from other devices through the bus. The BUS CONTROLLER designates to
the devices on the bus which function to perform. The Model 331 performs the functions of TALKER
and LISTENER but cannot be a BUS CONTROLLER. The BUS CONTROLLER is the digital computer
which tells the Model 331 which functions to perform.
Below are Model 331 IEEE-488 interface capabilities:
•
SH1:
Source
handshake
capability.
•
RL1:
Complete
remote/local
capability.
•
DC1:
Full device clear capability.
•
DT0:
No device trigger capability.
•
C0:
No system controller capability.
•
T5:
Basic TALKER, serial poll capability, talk only, unaddressed to talk if addressed to listen.
•
L4:
Basic LISTENER, unaddressed to listen if addressed to talk.
•
SR1:
Service request capability.
•
AH1:
Acceptor
handshake capability.
•
PP0:
No parallel poll capability.
•
E1:
Open collector electronics.
NOTE
: The Model 331 IEEE-488 Interface requires that repeat addressing be enabled
on the bus controller.
Instruments are connected to the IEEE-488 bus by a 24-conductor connector cable as specified by the
standard. Refer to Paragraph 8.4.2. Cables can be purchased from Lake Shore or other electronic
suppliers. A connector extender (Model 4005) is required to use the IEEE-488 Interface and the RELAY
and ANALOG OUTPUT Terminal Block at the same time.
Cable lengths are limited to 2 meters for each device and 20 meters for the entire bus. The Model 331
can drive a bus with up to 10 loads. If more instruments or cable length is required, a bus expander
must be used.
Remote Operation
6-1
