CTM64 Relay Board Relay Expansion Board for CTM64 Main Board Installation and User's Manual © 2006 by Doepfer Musikelektronik
The CTM Relay Board is an expansion board for the universal MIDI control electronics CTM64. The reason for this this additional board is the limited cable length between the CTM64 main board and the contacts (max. about 50 cm / 2 ft). By means of the relay board the cable length can be extended to 100m/300ft and even more. The working principle is very simple: The relay board is equipped with 16 reed relays that can be switched via very long cables.
Connections Power Supply BU1 The relay board requires a power supply that is connected to this socket. A plug-in type external power supply (AC adapter) is used. The power supply is not included with the relay board and has to be purchased separately. One reason for this feature is electrical safety. Keeping danger voltages (main) out of the board increases the electrical safety. Therefore an external power supply of high quality and safety should be used.
JP1 (16 pin connector) This pin header is connected to one of the pin headers JP1 (range 1...16), JP2 (range 17...32), JP3 (range 33...48) or JP4 (range 49...64) on the CTM64 main board. For the connection a 16 pin ribbon cable with a female connector on each side is used. Up to four relay boards can be combined with one CTM64 main board. Connecting the cable in the wrong to JP1...JP4 on the CTM64 main board will cause no damage. Only the sequence of the inputs will be mixed up. X1 ...
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.
screw terminals X1...X16 (relay control inputs) power supply input BU1 7-12V/160mA DC power supply X17 (forwarded power supply) LED control D17 (power display) 16 pin connector JP1 → to JP1 or JP2 or JP3 or JP4 of CTM64 main board common line JP2 (→ → JP6 of CTM64 main board) LED controls D1...
Schematics CTM Relay Board © 2006 by Doepfer Musikelektronik, Germany
Doepfer Musikelektronik www.doepfer.
