Lake Shore Model 340 Temperature Controller User’s Manual
Remote Operation 9-1
CHAPTER 9
REMOTE OPERATION
9.0 GENERAL
Two computer interfaces are provided with the Model 340 Temperature Controller. Either of these interfaces
permit remote operation of the Model 340. The first is the IEEE-488 Interface described in Paragraph 9.1.
The second is the Serial Interface described in Paragraph 9.2. The two interfaces share a common set of
commands described in Paragraph 9.3. Only one of the interfaces should be used at a time.
9.1 IEEE-488 INTERFACE
The IEEE-488 Interface is an instrumentation bus with hardware and programming standards designed to
simplify instrument interfacing. The IEEE-488 Interface of the Model 340 complies with the IEEE-488.2-1987
standard and incorporates the functional, electrical, and mechanical specifications of the standard unless
otherwise specified in this manual.
All instruments on the interface bus must be able to 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 340 performs the functions of TALKER and
LISTENER but cannot be a BUS CONTROLLER. The BUS CONTROLLER is your digital computer which
tells the Model 340 which functions to perform.
The IEEE-488 interface capabilities of the Model 340 Controller are listed below as well as in mnemonic
format on the rear panel of the controller.
• SH1: Source handshake capability • SR1: Service request capability
• RL1: Complete remote/local capability • AH1: Acceptor handshake capability
• DC1: Full device clear capability • PP0: No parallel poll capability
• DT0: No device trigger capability • E1: Open collector electronics
• 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
9.1.1 IEEE-488 Interface Settings
If using the IEEE-488 interface, the user must set the IEEE Terminator, End Or Identify (EOI), and Address.
Press the Interface key to display the COMPUTER INTERFACE screen. The user has the option to change
the Terminator (CR/LF, LF/CR, CR, LF, or none), EOI (On or Off), and Address (1–32). Use the s or t key
make selections. Use the Next Setting key to advance to the next parameter. Finally, use the Save Screen
key to accept the changes or the Cancel Screen key to decline the changes. The default settings are CR LF,
EOI On, and 12.
9.1.2 IEEE-488 Command Structure
The Model 340 supports several command types. These commands are divided into three groups.
1. Bus Control – Described in Paragraph 9.1.2.1.
a. Universal
(1) Uniline
(2) Multiline
b. Addressed Bus Control
2. Common – Described in Paragraph 9.1.2.2.
3. Interface and Device Specific – Described in Paragraph 9.1.2.3.
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