on page 84

RTFGM. I reviewed the Losmandy Gemini level 4 user manual. And noted the following remark, pertaining to making your own GPS cable, at the bottom of page 84... Alternatively, a cable can be made with an RJ22 plug as described in section 6.1, but with a male DB9 connector and the RxD and TxD wires swapped. Uh huh.