Agilent E1300B/E1301B Backdating Information
Setting the Mainframe Interrupt Bypass Switches
NOTE: This procedure is for older mainframes only. This step is not necessary if the serial number
prefix is 3327A on your Agilent E1300B, or 3326A on your Agilent E1301B. On newer mainframes, the
backplane automatically bypasses empty slots for daisy-chained signals required by the VXIbus and VMEbus
specifications. Solid state devices automatically route the IACKIN* line around an empty slot to the
IACKOUT* line. Backplane jumpers or DIP switches are not necessary since the solid state devices are
automatically activated when a module is installed. Remove the plate on the back of your mainframe to
verify the presence of Interrupt Bypass Switches. Continue with this procedure only if your
mainframe has interrupt bypass switches.
If a particular slot contains a plug-in module, open the corresponding slot’s interrupt bypass switch. If a
particular slot is empty, close the corresponding interrupt bypass switch.
Important The Agilent E1326A/B Multimeter is a two slot device that connects to the backplane on its
second slot only. When setting the bypass switches for an Agilent E1326, close the bypass
switch for its first slot, and open the bypass switch for its second slot.
Table B-2. Interrupt Bypass Switch Settings
Slot Setting Comments
0 full This is the command module which is always present.
1 empty Always empty.
2 full Full if internal multimeter is present. Otherwise, set to empty.
3-11 Set the IACK switch to full if a module is present. Otherwise, set switch to
empty.
An open interrupt bypass switch with no module in the corresponding mainframe slot causes this error after
power-on or reset: "Fatal Bus Error ACKing VXI Interrupt, Check Backplane Switch Configuration". A
closed interrupt bypass switch with a module in a corresponding mainframe slot can also cause this error.
Hardware Reference Information B-5
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