Keri Systems NXT 4-D User Manual
NXT 2-D/4-D Controller
TB1
TB2
TB3
TB4
TB5
TB6
TB7
TB8
TB9
TB10
J2
J7
J8J9
J10
S1
TB5, TB6, TB7, TB8,
U34, U35, and Relays
ARE NOT INSTALLED
on 2-Door Controllers
J1
+12 VDC
Earth Ground
Power Ground
6
5
4
3
2
1
123
4
3
2
1
1
2
3
4
1
2
3
4
1
2
3
4
4
3
2
1
6
5
4
3
2
1
1
2
3
4
5
6
1
2
3
4
5
6
IO-Minus (White)
IO-Plus (Green)
Ground (Black)
+12 VDC (Red)
IO-Minus (White)
IO-Plus (Green)
Ground (Black)
+12 VDC (Red)
(Red) +12 VDC
(Black) Ground
(Green) IO-Plus
( White) IO-Minus
(Red) +12 VDC
(Black) Ground
(Green) IO-Plus
(White) IO-Minus
TX-Minus
TX-Plus
RX-Minus
RX-Plus
Ethernet RJ-45 Connection
Tamper
Switch
Bus 1
Bus 2
Bus 3
Bus 4
Ethernet
Direct Connection
J6
PCB Earth Ground Lug
P/N: 01997-002 - Rev. D
J3
RS-485
RS-485
RS-485
RS-485
Battery
abc
de f gh i
jklm nopq
r
s
NXT-2D/4D Installation Drawing
Relay
Relay
Relay
Relay
tuvw
U32 U33
U34
U35
NO - Relay
Common / Door Lock - Relay
NC - Relay
Door Switch - Input
Ground
REX - Input
NO - Relay
Common / Door Lock - Relay
NC - Relay
Door Switch - Input
Ground
REX - Input
REX - Input
Ground
Door Switch - Input
NC - Relay
Common / Door Lock - Relay
NO - Relay
REX - Input
Ground
Door Switch - Input
NC - Relay
Common / Door Lock - Relay
NO - Relay
Power LED
Thermal Fuse
LED
Ethernet
Activity LEDs
RS-485 Bus
Activity LEDs
Relay State
LEDs
Utility LEDs Overcurrent LEDs
Port 1
Port 2
Port 3
Port 4
Installation Guide
1.0 Wiring and Layout Diagrams
1.1 NXT-2D/-4D Controller
See Table 1 on page 2 for LED definitions.
NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a residential area may cause harmful interference in which case the
owner will be required to correct the interference at the owner’s expense.
Page 1 of 6 P/N: 01997-001 Rev. I
NXT 2-D/4-D Controller
Installation Guide
1.2 LED Definitions Table
Table 1: NXT Controller LEDs
Ethernet
Purpose LED Relay State Purpose LED
Comm
10/100 a (D21) Relay 1 active n (D3)
Link b (D22) Relay 2 active o (D8)
Activity c (D33) Relay 3 active p (D13)
Utility Purpose LED
Standard FW
Config Reset
Host Channel Active e (D49) indicator r (D26)
Firmware Upgrade f (D50)
Event Channel Active g (D51)
unused h (D52) indicator s (D23)
Mercury FW
Config Reset
d (D48)
i (D53)
RS-485 Bus Purpose LED
a
Relay 4 active q (D18)
Power Purpose LED
Thermal Fuse
RS-485 Bus
b
c
Purpose LED
Purpose LED
Bus 1 Tx j (D1) Bus 1 Over Current t (D54)
Bus 2 Tx k (D6) Bus 2 Over Current u (D55)
Bus 3 Tx l (D11) Bus 3 Over Current v (D56)
Bus 4 Tx m (D16) Bus 4 Over Current w (D57)
a. PCBs at revision F or greater have the RS-485 Bus Over Current LEDs t, u, v, and w. PCB revisions earlier
than revision F do NOT have these LEDs.
b. If LED s is green, the power wires are reversed; if LED s is red, the unit is drawing too much current.
c. If LED t, u, v, or w is red, that individual bus is drawing too much current and the bus is shut down to protect
the controller. When this condition is corrected, the LED will turn off and the bus will be activated.
Page 2 of 6 P/N: 01997-001 Rev. I
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