AFP-400 Installation
PN 50253:A2 03/12/96
A-11
LCD-80 Termimal Mode EIA-485 Connection
EIA-485 circuits are power limited and supervised.
Maximum distance between the control panel and the first or last LCD-80 and
between each LCD-80: 6000 feet (@16 AWG).
Use overall foil/braided-shield twisted pair cable suitable for EIA-485 applica-
tions.
An EIA-485 circuit is rated at 5.5 VDC max., 60 mA max.
For non-English language systems, LCD-80 standby current equals the alarm
current (100 mA).
Refer to the LCD-80 Manual for additional information.
Each LCD-80 must connect to regulated 24 VDC power. Power an LCD-80
from the MPS-400 power supply or a separate listed power supply. (See
Figure A-3 for power connections.)
R-120 Resistor
Set LCD-80 DIP switches as follows:
1) Install R-120 resistors across the IN and OUT terminals of each LCD-80.
2) Set SW4 and SW5 on the LCD-80 to the TERM position: SW1-7 ON.
3) Set DIP Switch SW3-1 and SW3-2 to OFF on all LCD-80s except the last
LCD-80.
4) Set SW3-1 and SW3-2 to ON on the last LCD-80.
Connection Guidelines
Connecting LCD-80s in
Terminal Mode
Figure A-1 Termimal Mode EIA-485 Connection
EIA-485
Return
Shielded
Twisted Pairs
+ – + –
In Out
EIA-485
Ouput
4
3
2
1
() EIA-485 In
() EIA-485 Out
(+) EIA-485 In
(+) EIA-485 Out
() EIA-485 In
() EIA-485 Out
(+) EIA-485 In
(+) EIA-485 Out
4
3
2
1
CPU-400 TB3
EIA-485 Out
First LCD-80
Last LCD-80
