Interrupt Level Switches - IBM RT User's Setup Manual

In te rru p t Level Sw itches
With the IBM RT PC 4-Port A synchronous RS422A Adapter and
the correct cables, you can connect a system unit to ASCII
term inals located up to 1212 meters (3963 feet) from the system
unit.
Note:
If you use cables longer th a n 122 meters (399 feet), you
must provide surge protection. Also, do not install these cables
outdoors.
Use the following d ia g ra m to set the in te rru p t level on all the
4-port adapters. NonbufTered 4-Port A synchronous adapters should
be grouped on one in te rru p t level, and Buffered 4-Port
A synchronous A dapters should be grouped on another, preferrably
higher, in te rru p t level.
In terru p t Level 10 is recommended when using the 4-Port
A synchronous A dapter together w ith the SCSI Adapter. If the
4-Port A synchronous A dapter is set for In terru p t Level 11, certain
Section 6. C om m unication and N etw ork Adapter Options 6-33