Doepfer CTM64 Relay Board - Manual (Page 5)

Operation remarks
Before the relay terminals X1 ... X16 are wired for the final installation it is a good idea to test
the CTM64 main board in combination with the relay boards in advance.
The CTM64 main board has to be adjusted to the desired Midi channel, mode (note or
program change messages), note number/program number range and polarity as described
in the manual of the CTM64 main board. Check the CTM64 main board (still without relay
boards) as described in the manual of the CTM64 main board (check list on page 12). If the
CTM64 main board is working as it should the relay board(s) is/are connected to the CTM64
main board as described on the previous pages of this manual.
Then the complete construction is powered by plugging the AC adapters into a wall outlet
and connecting them to the corresponding sockets of the CTM64 main board (BU3) and the
relay board (BU1).
For a first test one of the relay terminals X1 ... X16 has to be shortened by using a short wire.
The corresponding LED of the relay board has to turn on and at the Midi output of the
CTM64 main board the corresponding Midi message (note on/off or program change) has to
be sent. Short even some of the other relay terminals (X1...X16) and check the
corresponding LED and Midi Out to make sure that everything is working as it should.
If all is OK the final wiring of the relay terminals X1...X16 is carried out. The terminal screws
have to be tightened very fast to avoid slipping out of the cables. Unused relay inputs are
simply left open. By means of the control LEDs on the relay board(s) it is very easy to find
out if one of the relays is not controlled in the right way – e.g. because of a broken wire or a
loose connection.