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Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual

Remote Operation

4-1

CHAPTER 4

REMOTE OPERATION

4.0. GENERAL

Either of two computer interfaces on the optional 6224 card permit remote MPS operation: the IEEE-488

Interface (Paragraph 4.1) and the Serial Interface (Paragraph 4.2). Use only one of the interfaces at a time.

The two interfaces share a common set of commands described in Paragraph 4.3. For further information on

RS-485 Mainframe Control Bus Operation, see Appendix C.

4.1. IEEE-488 INTERFACE

The IEEE-488 Interface is an instrumentation bus with hardware and programming standards that simplify

instrument interfacing. The MPS IEEE-488 Interface 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 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 MPS performs the functions of TALKER and LISTENER but cannot be a BUS

CONTROLLER. The BUS CONTROLLER is the digital computer which tells the MPS which functions to

perform.

Below are MPS IEEE-488 interface capabilities:

• 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

• 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

4.1.1 IEEE-488 Interface Settings

To use the IEEE-488 interface, the user must set

the IEEE Address and Terminators. Press the

Function Menu key, then press the key

corresponding to INTERFACE SETUP to display the

Interface Setup screen. Use the cursor keys to

move the arrow indicator to IEEE ADD and

TRMS/EOI.

IEEE ADD: 1 to 30

Use the Data Entry up or down arrows to increment or decrement the IEEE Address. The default value is 12.

The range of choices is from 1 to 30.

TRMS/EOI: CR LF, LF CR, DAB, LF, with or without EOI

Use the Data Entry up or down arrows to cycle through the following choices: (CR LF) EOI, (LF CR) EOI,

(DAB) EOI, (LF) EOI, (CR LF), (LF CR), (DAB), (LF). If turned on, End Or Identify (EOI) is asserted during the

last byte of a multibyte transfer. The default is Carriage Return and Line Feed (CR LF) with EOI ON.

INTERFACE SETUP:

¤ IEEE ADD

TRMS/EOI

RS232C

CB DEF

CB ADD

VW ANGLE

MF ID

OUTPUTS: *

+1.999A

: 12

: (CR LF) EOI

: 9600,N,8,1

: 9600,0,7,1

: 0

: 9

: 622 (1)

+0.001V

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 89 90

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Lakeshore Learning Materials 622 Manual de usuario Pagina 39

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