Measurement-computing Serial488/4 Bedienungsanleitung PDF herunterladen (Seite 18)

Section 1 Introduction

2.6

Figure 2-4. Pictorial View of the Secondary Addressing Mode

Port 2

Control /

Status

Port 1

Control /

Status

Port 3

Control /

Status

Port 4

Control /

Status

ort 2

Data

ort 1

Data

ort 3

Data

Port 4

Data

Port Select

Command

(Pn)

IEEE 488

econdary

ddress 00

(

command)

econdary Addresses

01 - 04

(

Port 1)

(

Port 2)

(

Port 3)

(Port 4)

2.3.1.2 Dual Primary Addressing Mode

When Dual Primary addressing mode is selected,

communications with the Serial488/4 is accomplished by using two

consecutive primary IEEE bus addresses. Th ese addresses are

selected by SW-2 through SW1-5, SW1-1 (the LSB) of the address

is ignored. Of the two addresses specified, the even address is used

in transferring command and status information and the odd

address is used for serial data transfers. In this mode, control of the

serial ports is multiplexed through the even or command/status

address, with the Port (

) command selecting the desired port.

Serial data transfers are multiplexed through the odd or data

address, again with the Port (

) command selecting the desired

port.

Figure 2-5 illustrates the relationship between the

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