Use a Hyper terminal,
Hercules SETUP utility is user friendly for this. Attach a Serial cable to the unit (straight through cable not null modem) or use a USB to serial cable.
Set the Baud rate to 115200
Data size 8
Parity none
Handshake OFF
Mode Free
do not check the box for Hex
For the 12x8 digital/ analog audio matrix switch cat5 enter the command [S,M,Q]
12x8 digital/ analog audio matrix switch [S,M,L]
8x8 component video digital/ analog audio matrix switch cat5 [S,M,C]
8x8 component video digital/ analog audio matrix switch [S,M,B8]
12x8 component video matrix switch [S,M,I]
12x8 component video matrix switch cat5 [S,M,H]
8x16 digital/ analog audio matrix switch [S,M,G]
8x16 digital/ analog audio matrix switch cat5 [S,M,E]
8x16 component video matrix switch [S,M,F]
8x16 component video matrix switch cat5 [S,M,D]
12x16 component video matrix switch [S,M,J]
12x16 component video matrix switch cat5 [S,M,O]
12x16 digital/ analog audio matrix switch [S,M,K]
12x16 digital/ analog audio matrix switch cat5 [S,M,R]