>> P60-1 to P60-2
>> P60-3 to P60-4
>> P62-2 to P60-6
>> P62-4 to P60-8
>> P60-1 to P62-1 (this means two wraps on P60-1)
>> P60-7 to P62-3
>> P62-8 to P62-5
Maybe I'm not understanding your numbering scheme? P60-1 to P62-1 connects DTR from the SCC to pin 2 of the serial cable (either Rx or Tx)??? And, P62-2 to P60-6 connects Rx of the SCC to pin 5 of the serial cable (normally ground???). Is that right? And signal ground ought to go to pin 5 of the serial cable, so I see the "problem" with the ground connection on P57.
This is what I get for the connectors (P60 and P62) from the schematic. I've added in the "standard" DB-9 signal names and pin numbers above (and below) the cable part of P60 and P62.
1 3 5 7
DCD Tx Gnd RTS Rx DCD Gnd RTS
+------------------+------------------+
| 2 4 6 8 | 2 4 6 8 |
| cable | chip |
| | |
| P60 | P62 |
| | |
| chip | cable |
| 1 3 5 7 | 1 3 5 7 |
+------------------+------------------+
DTR Tx Gnd CTS Rx DTR DSR CTS
2 4 6 8
So, I would guess put a jumper at position 1 (numbered left to right, position 1 to 8), 3, 4, 6, 7 and 8??? And maybe cross Tx and Rx (P60-3 to P62-1 and P60-4 to P62-2)???? Maybe do something between pin 10 and pin 5 of P57 to get signal ground to conductor 5 of the serial cable???
All very confusing.
Roger