Measurement Computing Serial488/4 - Manual (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 Port 2
Data Port 1
Data Port 3
Data Port 4
Data
Port Select Command
IEEE 488
Even Address (08)
(command ) Odd 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.