IBM 5155 Manual To Operations page 356

Specific Instructions
1
Study the figure below and become familiar with
the Binary Synchronous Communications (BSC)
Adapter. The "primary" and "alternate" modes
are determined by the position of the jumper
clip. Installing the jumper on pins 2 and 4
r",
selects the "primary" BSC adapter mode.
Installing the jumper clip on pins 1 and 3 selects
the "alternate" BSC adapter mode.
Install the jumper clip on the pins you have
selected.
Connectors P1 and P2 must
"Primary BSC
have jumpers as shown for
Adapter" jumper
"Alternate BSC
correct operation of the
position
Adapter" jumper
adapter.
position
P3 P3
P1
25 Pin
Connector
~
a
~ rn rn []
I I I
0
nnnnn
DuD
2 BSC
January 1984