![background image](http://html.mh-extra.com/html/northern/n-1000-iii/n-1000-iii_installation-and-programming-manual_1708226025.webp)
N-1000-III/IV
N-1000-III/IV
N-1000-III/IV
N-1000-III/IV
N-1000-III/IV
4–8
4–8
4–8
4–8
4–8
Section 4: P
Section 4: P
Section 4: P
Section 4: P
Section 4: Panel L
anel L
anel L
anel L
anel Layout
ayout
ayout
ayout
ayout
4-5: Terminal Block 7
Terminal Block 7 contains the 485 multi-drop communication connection, terminals
for alarm input points 1 through 4, an alarm point common and the 20 mA com-
munication loop (receive and transmit) terminals as illustrated in Figure 4-6.
NOTE:
The yellow communications LED (CR16) can be enabled when using RS-485
interface by shorting TB7-11 and TB7-12 together.
Jumper settings on the panel are used to select either the 485 multi-drop or the
20 mA communications mode. The last panel on the 485 multi-drop cable must
be properly configured. Refer to Section 4-9, Jumpers, for further information.
The 20 mA communication protocol specifications are as follow:
ASCII text characters
8 data bits
1 stop bit
No parity
(Refer to Section 4-8 for baud rate settings.)
Terminal
Function
Wire Color(s)
1
Alarm Point Common*
2
485 multi-drop (A+)
Red
3
485 multi-drop (B+)
Black
4
Alarm Input 1
(Door 1 status)
5
Alarm Input 2
(Door 2 status)
6
Alarm Input 3
(Door 3 status N-1000-IV)
7
Alarm Input 4
(Door 4 status N-1000-IV)
8
Alarm Point Common*
9
20 mA
Communication Loop:
Red
10
20 mA
Communication Loop: Receive–
Black
11
20 mA
Communication Loop: T
White
12
20 mA
Communication Loop: Transmit–
Green
*All N-1000 alarm point commons are electrically the same and can be used with
any panel alarm points.