Doepfer MTC64 Relay Board - Manual (Page 4)

Connections
JP2 (10 pin connector)
This pin header is connected to JP5 on the MTC64 main board and carries GND and
+5V (i.e. the power supply for the relay board). For the connection a 10 pin ribbon
cable with a female connector on each side is used. If two or more MTC relay boards
are used in combination with one MTC64 main board this connection has to be
carried out parallel (i.e. GND and +5V for all boards). For this a special 10 pin ribbon
cable has to be used with the corresponding number of female connectors. A cable
with 3 connectors is required for 2 relay boards, a cable with 4 connectors is required
for 3 relay boards and a cable with 5 connectors is required for 4 relay boards. If
several MTC relay boards are ordered together a suitable cable is enclosed. If the
relay boards are ordered one after another the special cable has to be ordered in
addition (please specify the number of female connectors and the distances between
the connectors).
Pay attention to the correct polarity of the connection: the wire of the ribbon cable
that leads +5V (this side of the connector is labelled "+5V" on the MTC64 main
board) has to point down (i.e. direct to the integrated circuits on the relay board). If
the 10 pin cable is connected in the wrong way GND and +5V are shortened. This
may destroy the power supply of the MTC64 main board!
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 MTC64 main board.
For the connection a 16 pin ribbon cable with a female connector on each side is
used. Up to four MTC relay boards can be combined with one MTC64 main board.
Connecting the cable in the wrong to JP1...JP4 on the MTC64 main board will cause
no damage. Only the sequence of the outputs will be mixed up.
X1 ... X16 (2 pin screw terminals)
These are the terminals for the contacts of the 16 relays. Each 2 pin terminal
corresponds to one relay. The contacts can be treated like normal on/off switches
(controlled by Midi note messages). The max. voltage is 100V and the max. current is
1A for each relay.