ADDER AdderView Matrix AVM208MP Installation And Use Manual page 75

Adapters:
VSA1 mouse adapter - This is required if you wish to connect a computer that has
a 9-pin serial mouse connection:
Cables should be no longer than 30 metres.
NOTE - There are several common wiring specifications for 6-pin mini-DIN to
9-pin serial adapters. If you have an adapter that has been supplied with a
mouse it may have a completely different internal wiring to that shown above
and may not be compatible with the AdderView MATRIX MP
AdderView MATRIX MP Installation and Use Page 74