I have recently acquired a THS720A and this is a very interesting thread indeed! It came without the serial cable, and I wish to make one. I read the whole thread and there are some pinouts given, but I was not able to understand clearly what the connections are. Different sources also seem to follow different numbering conventions, adding to my confusion. I am attaching a picture with the pins clearly marked and labelled 1,2,.., 8 and a,b,c,...,i. Could someone with a working cable please post what the connections are with reference to this naming convention. Thanks.
Edit:
1. With hard flagging and soft flagging both set to 'off' (no flow control), communication works fine with just Tx, Rx and Gnd connected, as expected. So,
3 <-----> d
4 <-----> c
5 <-----> a
seem to be sufficient.
2. With hard flagging set to 'on' (hardware flow control), communication seems to work fine with the following connections:
1 <-----> e & g
8 & 2 <-----> h
3 <-----> d
4 <-----> c
5 <-----> a
6 <-----> i
7 <-----> b
8 <-----> h
Tested with a Keyspan USA-19HS serial-to-usb adapter which is male on its serial end.