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8
Smart Relay 4 Installation and Operation Manual
INSTALLATION
Mode DIPswitch
Description
10
1010
Two input NOR (0 = input inactive, 1 = active)
00 1
01 0
10 0
11 0
11
1011
Two input OR
00 0
01 1
10 1
11 1
12
1100
Two input XOR
00 0
01 1
10 1
11 0
13
1101
Two input AND
00 0
01 0
10 0
11 1
14
1110
Two input NAND
00 1
01 1
10 1
11 0
15
1111
Reserved (feature creep).
Installation of the Smart Relay 4 in high RF environments should be performed with
care. Shielded cable is suggested for all connections. All shields should be tied to the
EGND terminals. The station ground should be connected to the chassis ground screw
located on the far right side of the SR-4 as viewed from the rear. It is recommended
that all cables connected to the SR-4 be looped through ferrite cores to suppress RF.
Surge protection with RF filtering is also suggested for the wall transformer. The pur-
chase of an inexpensive UPS will provide back up in case of power outages.
Connections are via screw terminals and/or the RJ-21X option. Remove about 1/8”
of insulation from each wire. Insert the wire into the desired terminal and tighten
the screw. Be sure no bare wires are exposed.
! NOTE:
Refer to page 11 of this manual when using the RJ-21X option.
