EDAC Installation Guide
512-1090-001, Revision K0
Page 20 of 56
EDAC Dual Relay Cards
EDAC dual relay cards, as illustrated in Figure 6, provide dry contact closures for
installations where recording equipment is not voice activated and requires start/stop
control. Each relay card has two relays allowing one relay card to support one or two
ports.
The quantity of relay cards needed is dependent on the number of ports configured. For
example, a six-port configuration will require three relay cards. When the recording
device requires relay contacts, the maximum number of ports supported per EDAC
base unit is eight. When there is no conversation on the line, relay contact pairs are
normally open. When there is a conversation on the line, the relay contact closes to
start the recorder. If relay closures are needed, port cards may be installed in sockets 1-
8 and relay cards in sockets 9-12.
Figure 6. EDAC Duel Relay Card
WARNING
Relay cards are the same size and shape as port cards but should only be installed in
sockets JP9 - JP12 on the base unit.
Table 3 shows the port locations on the base board served by each relay card.
Table 3. Relay and Port Card Position Assignments
Relay Card Position
JP9
JP10
JP11
JP12
Port Card Position
JP1 & JP2
JP3 & JP4
JP5 & JP6
JP7 & JP8
