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INSTALLATION
SETUP OF JUMPERS
AND MECHANICAL
SWITCHES
GPIB Address
Before installation in a mainframe, it is desirable to set the
GPIB and byte order jumpers as follows:
Each device connected to the GPIB must have a unique address
which the system controller uses to communicate with it. The
address of the Model 8901A is set by a DIP switch located un
der the GPIB connector on the front panel. The switches are
labeled A0,A1,A2,A3,A4 (representing values of 1,2,4,8,16 re
spectively). Valid GPIB address are 0 to 31. Figure 3.1 shows
an address setting of 5 as an example.
GPIB Address Switch Settings
X
X
X
X
X
X
0
1
AO A1 A2 A3 A4 -
(X indicates switch depressed)
Figure 3.1
Byte Order Jumpers
INSTALLATION IN
MAINFRAME
On the side panel of the Model 8901A are two pair of jumpers
labeled "NORMAL" and "REVERSE". These jumpers deter
mine the order in which the data bytes are read out. When the
jumpers are set to normal, the least significant byte of data is
read out first in multibyte transfers. When in the reverse byte
position, a 16-bit word is read out, most significant byte first,
followed by the least significant byte. If 24-bit transfer is se
lected, the order is middle byte, least significant byte and then
most significant byte. It is recommended that the reverse byte
option only be used when the computer expects the MSB before
the LSB in a 16-bit word. Caution - this jumper only controls
the byte order for reading out of the 8901A. It does not effect
the "write" data.
The 8901A is compatible with any CAM AC mainframe.
With the power off, insert the 8901a into the Control Station
location (the two rightmost locations in the mainframe).
Connect a GPIB cable from the 8901A to the GPIB interface
associated with your computer.
Always ensure that the mainframe has sufficient clearance at the
top to permit adequate airflow. During operation in the 8013A
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