Measurement-computing Serial488/4 Manual de usuario descargar pdf (Pagina 17)

Section 2 Getting Started

2.5

Figure 2-3. SW1 View for Addressing Mode Selection

Switch

Side

View

DOT

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Dual Primary Addressing

Mode

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Secondary Addressing

Mode

2.3.1.1 Secondary Addressing Mode

When Secondary addressing mode is selected,

communications with the Serial488/4 is accomplished by using the

primary bus address selected by SW 1-1 through SW 1-5 and an

additional secondary bus address. Secondary address 00 is used in

transferring command and status information while secondary

addresses 01 through 04 are used for serial data transfers with serial

ports 1 through 4 respectively. In this mode, control of the serial

ports are multiplexed through secondary address 00, the

command/status address, with the Port (

) command selecting the

desired port. Data transfers, however, are not multiplexed as each

serial data port has its own unique secondary address.

Figure 2-4 illustrates the relationship betw een the

command/status and serial data addresses w hen using the

secondary addressing mode.

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Measurement-computing Serial488/4 Manual de usuario Pagina 17