(4) The sum of the currents absorbed by terminals [Z1],
[Z2], ..., [Z8], [24V], [24R], [NAC1] and [NAC2] must not
exceed: 1.5 A for the J424 control panel; 1 A for the
J408 control panel.
(5) The terminals [Z1], [Z2], ..., [Z8] and [DL], if not used,
must be connected to negative using a 3900 ohm resistor.
(6) Connect a 3900 ohm resistor between the [+] and [-]
terminals of the NAC1 and NAC2 Outputs, if not used.
52 Conventional Fire Panels J424/J408
TERM. DESCRIPTION v(V) i(A)
2 and 4 ZONE MAIN BOARDS
[DL]
(5)
Supervised—Bypassable DIALLER Output:
during Standby è floating
on expiry of the Alarm Signalling Delay è negative pull-down to 0 V 0 0.1
[OC]
PROGRAMMABLE AUXILIARY Output:
during Standby è terminal floating
on verification of an associated event è negative pull-down to 0 V 0 1
[24V]
[M]
24 V POWER Output:
Positive pull-up to 27.6 V on [24V] terminal
Negative pull-down to0Von[M] terminal
27.6
0
1(4)
—
[24R]
[M]
RESETTABLE 24 V POWER Output:
during Standby è positive pull-up to 27.6 V on [24R] terminal
during Reset è [24R] terminal floating;
Negative pull down to0Von[M] terminal
27.6
—
0
1(4)
—
—
[PL]
POWER LOSS Output:
during Standby è floating
during power failure è negative pull-down to 0 V
—
0
—
1
ALARM
Non-Supervised—Silenceable ALARM Output:
Control panel in Standby è [COM] terminal connects to [NC] and [NO] floats
Control panel in Alarm è the [COM] and [NO] terminals connect, in accordance with programming — 5
FAULT
Non-Supervised—Silenceable—Bypassable FAULT Output:
Control panel in Standby è [COM] terminal connects to [NC] and [NO] floats
in the event of Fault è [COM] terminal connects to NO] and [NC] floats — 5
NAC1
(6)
Supervised—Silenceable—Bypassable ALARM Output N. 1:
Panel in Standby è negative pull-down to 0 V on [+] terminal; positive pull-up to 27.6 on [–] terminal
Panel in Alarm è
positive pull-up to 27.6 on [+] terminal; negative pull-down to 0 V on [–] terminal 27.6 1(4)
NAC2
(6)
Supervised—Silenceable—Bypassable ALARM Output N. 2:
Panel in Standby è negative pull-down to 0 V on [+] terminal; positive pull-up to 27.6 V on [–] terminal
Panel in Alarm è positive pull-up to 27.6 on [+] terminal; negative pull down to 0 V on [–] terminal 27.6 1(4)
8 ZONE MAIN BOARD
RS485
RS485 Serial Port:
Positive pull-up to 27.6 V on [24V] terminal;
Negative pull-down to0Von[M] terminal;
data on [+] and [–] terminals
27.6
0
—
1(4)
—
—
Table 4 (...continued) Terminals Description
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