Videotec SM82A - Manual (Page 46)

Page 8 MNVCSM42A_0408
3.4 Configura tion
3.4.1 Opening an d closing
Warning! Only skilled, authorised technicians should be allowed to open the matrix.
• Disconnect the matrix from the main power supply by disconnecting the jack
• Remove the screws on the back of the matrix, behind the top cover
• Remove the cover, taking great care not to leave the removed screws or other metal parts inside the matrix
and being very careful with the local keyboard wiring
To close up, carry out the above operations in reverse order, always working with the power supply
disconnected.
3.4.2 Dip-switche s and jumper
3.4.2.1 Functions of the dip switches
Inside the SM42A / SM82A matrix there is an 8-way configuration dip switch (SW1):
DIP FUNCTION
DIP 1,2,3,4 Selection of protocol for communication with the keyboards; see section 3.4.2.2
DIP 5 Not used: leave OFF
Dip 6 Not used: leave OFF
Dip 7,8 Not used: leave OFF
Dip Switch SW1
Jumper J5 Video input termination