+ The in stru ment firm ware EEROM set tings for stored
cal i bra tion con stants can be cor rupted by run ning in
GPIB mode while con nected to a PC on the APIB
con nec tor. This may re sult in an in op er a ble in stru -
ment.
Al ways dis con nect the PC from the APIB bus be fore
switch ing to GPIB mode.
Al ways con nect the PC to the APIB bus af ter switch -
ing to APIB mode.
Whether con trolled by APIB or GPIB, a 2700 se ries in stru ment still uses
the APIB bus to con trol other Au dio Pre ci sion APIB in stru ments and ac ces so -
ries, such as the DCX-127 or the SWR-2122 fam ily of switch ers. Fig ure 71 il -
lus trates how to con nect these de vices to a 2700 se ries in stru ment when the
GPIB port is the con trol port; Fig ure 70 il lus trates how to con nect an APIB
con trol ler to this sys tem when the GPIB port is dis abled.
Establishing GPIB Communication
GPIB Connection
A GPIB-equipped 2700 se ries in stru ment has a 24-pin GPIB-com pat i ble
con nec tor on the rear panel. This D-shell con nec tor con forms to the me chan i -
cal re quire ments of IEEE-488.1-1987. The in stru ment is to be con nected to the
in stru ment con trol ler via an ap pro pri ate ca ble. The in stru ment con trol ler (a
per sonal com puter) must have a cor re spond ing GPIB in ter face port. Stan dard
Chapter 7: GPIB Configuration The GPIB Software Development Process
96 Getting Started with Your 2700 Series Instrument
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