Adder Technology RC1 - Manual (Page 46)

AdderView DVI Installation and Use Page 39
A.4 Flash upgrade cable connection
The cable connections shown below are to connect either COM1 or COM2 of a PC
to the AdderView DVI to allow flash upgrades.
A.5 RS232 synchronisation cable pin assignments
The cable connections shown below are to connect two AdderView DVIs together
for synchronised operation (see section 3.8)