1260-00C User Manual
Operation 3-18
given the next available GPIB address. For example, if the
1260-00C and its Message-Based Servants have Logical
Addresses 0, 24, 27, and 33, the 1260-00C assigns GPIB
addresses as shown in Table 3-10.
Table 3-9. Example GPIB Address Assignment
Logical Address
3 LSB (Order
of Assignment)
5 MSB
GPIB
Address
Decimal
Binary
Binary
Binary
Decimal
0
00000000b
000b
00000b
0
24
00011000b
000b
00011b
3
33
00100001b
001b
00100b
4
27
00011011b
011b
00011b
5
In the example shown in Table 3-10, the device at Logical Address
27 was assigned GPIB Address 5 because addresses 3 and 4
were previously assigned. By spacing the 1260-00C
Message-Based Servants at intervals of eight logical address
locations, situations are avoided by which removing or adding one
device changes the GPIB address of another device.
The default configuration for the 1260-00C is to use multiple GPIB
secondary addresses (not multiple primary addresses). To
change the configuration to use multiple primary addresses
through non-volatile memory configuration is described in Chapter
5, Change Configuration Information.
Changing the self-assigned default GPIB address of the 1260-00C
through the non-volatile memory configuration is described in
Section 5. The default GPIB address of the 1260-00C when
configured for multiple secondary addresses is Secondary
Address 0 (Primary Address 1). The default GPIB address of the
1260-00C when configured for multiple primary addresses is
Primary Address 1 (no secondary address).
At times, when using multiple primary addressing, it may be
necessary to avoid particular GPIB addresses to avoid conflicts
with GPIB instruments outside of the VXI mainframe. GPIB
addresses to avoid can be specified through the non-volatile
memory configuration as described in Chapter 5.
System Configuration
During the execution of the RM and general configuration
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