Measurement-computing Serial488/4 Manuel d'utilisateur télécharger pdf (Page 19)

Section 2 Getting Started

2.7

command/status and serial data addresses w hen using the dual

primary addressing mode.

Figure 2-5 Pictorial View of the Dual Primary 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

IEEE 488

Even Address (08)

(command )

dd Address (09)

(data )

2.3.2 IEEE 488 Address Selection

The IEEE 488 bus address is set by SW1-1 through SW1-5 (located

on rear panel). The address is read only at pow er on and can be set from 0

through 30 when using the secondary addressing mode, or 0 to 28 using the

dual primary addressing mode. The address is selected by simple binary

weighting with SW1-1 being the least significant bit and SW 1-5 the most

significant bit (see Figure 2-6). SW1 switch positions for IEEE addresses 0

through 30 are listed in Table 2-1. The factory default is address 8.

NOTE: If address 30 / 31 is selected, when using dual primary addressing

mode, it defaults to address 28 / 29 because the IEEE 488 standard has

reserved address 31. Similarly if address 31 is selected, when using the

secondary addressing mode, it defaults to address 30.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 90 91

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Measurement-computing Serial488/4 Manuel d'utilisateur Page 19

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