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MST488-27 013004

3-1

SECTION 3 - OPERATION

3.1 GENERAL

Kepco MST 488-27 Power Module Controller is programmed over a control bus using either

SCPI (Standard Commands for Programmable Instruments) or CIIL (Control Interface Interme-

diate Language) commands. SCPI and CIIL provide a common language used in an automatic

test system.

The control bus can be either the IEEE 488 standard communication bus (General Purpose

Interface Bus, GPIB), or the RS 232C communication bus. (Refer to Table 2-4 for input/output

signal allocations.) Connection of both GPIB and RS 232 ports simultaneously is not recom-

mended.

NOTE: Upon power loss, all programmed values/configurations are lost and must be repro-

grammed.

3.2 IEEE 488 (GPIB) BUS PROTOCOL

Table 3-1 defines the interface capabilities of the MST 488-27 controller (Talker/Listener) rela-

tive to the IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard Digital

Interface for Programmable Instrumentation) communicating with a Host Computer–Controller

(Talker/Listener).

Tables 3-2 and 3-3 define the messages sent to the MST 488-27, or received by the MST 488-

27, via the IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode, respectively.

These messages are enabled during the “handshake” cycle, with the MST 488-27 controller

operating as either a Talker or a Listener.

TABLE 3-1. IEEE 488 (GPIB) BUS INTERFACE FUNCTIONS

FUNCTION

SUBSET

SYMBOL

COMMENTS

Source Handshake SH1 Complete Capability (Interface can receive multiline messages)

Acceptor Handshake AH1 Complete Capability (Interface can receive multiline messages)

Talk e r T 6

Basic talker, serial poll, unaddress if MLA (My Listen Address) (one-byte

address)

Listener L4 Basic listener, unaddress if MTA (My Talk Address) (one-byte address).

Service Request SR1

Complete Capability. The interface sets the SRQ line true if there is an

enabled service request condition.

Remote/Local RL2 No Local lock-out.

Parallel Poll PP0 No Capability

Device Clear DC1

Complete Capability. DCL (Device Clear) and SDC (Selected Device Clear)

supported.

Device Trigger DT1 GET supported.

Controller C0 No Capability

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