IBM B01 Service Manual page 55

PCI/ISA BUS Isolation
I~ ~I
DIV1
DO DIV2
c::J
DIV4
Figure 16. Headers J1C - J4C, Clocking Mode
RS422 Adapter Card Layout:
The following diagram shows the card layout, with the location of
the switches:
J1
, - - - - - r - - - - - - - - - ,
D
DIVl
J1 C DIV2
DIV4
D
DIVl
J2C
DIV2
DIV4
J3C
DIV2
" DDIVl
,---------,\ I
DO
D
~:~~
J4C DIV2
DIV4 ' - - - - - - - - - - '
J1c=J
I~~~II~~BJ I~:~II~:~I
PPTLL «CI:Z «CI:Z «CI:Z «CI:Z
D
J 2 c = J
PPTLL
J 3 c = J
PPTLL
J 4 c = J
PPTLL
I
I'-----_ _
~I
Figure 17. The RS422 Adapter Card Layout
RS422 Diagnostics
A Serial Utility Diskette contains the diagnostics for the adapter and will be used in the troubleshooting
procedures.
1
With the customer's help, stop all S/390 programs and shut down the S/390 operating system if it is
actively running on the P/390.
2
Create the RS422 Adapter diagnostic diskette. See "Creating Diagnostic Diskettes" on page 230 for
instructions on how to create the diskette, using the System/390 Integrated Server Install CD.
3
Shut down OS/2.
4
Insert the RS422 Adapter diagnostic diskette in the floppy drive. Make sure it is not write protected.
5
Press CTRL-ALT-DEL or press the RESET switch.
Prior to pressing ENTER to continue, record the four port addresses. These are to be used later to
run the diagnostics.
6
Follow the instructions on the screen to run diagnostics.
34
Service Guide