Radio Programmer (all revisions) DOES NOT support the P5400 series.
The last radio supported by Radio Programmer (r20a10, FINAL revision) was the P5100/P7100 family of radios, using J2r11b firmware or earlier.
Radio Program Manager (RPM) software is required. RPM revision 2 or revision 3 supported the P7200 radios, I seem to recall it was revision 4 or revision 5 of RPM before the P5300, P5400 & P7300 radios were supported. The P5500 and XG's came even later.
The cable diagram would be contained in those revisions mentioned revisions or later. I did a screen capture from RPM of the cable, which is shown below.
Hope this helps.