A-12
AFP-400 Installation
PN 50253:A2 03/12/96
LCD-80 ACS Mode EIA-485 Connection
Connection Guidelines
EIA-485 circuits are power limited and supervised.
LCD-80s require connection of operating power.
Maximum distance between the control panel and the first or last LCD-80
and between each LCD-80: 6000 feet (@16 AWG).
If powering LCD-80s by a separate, listed power supply, you can connect
up to 32 devices.
6000 feet maximum distance (@16 AWG) between the control panel and
the first or last LCD-80 and between each LCD-80.
Use twisted pair cable with a characteristic impedance of approximately
120 ohms.
The EIA-485 circuit is rated 5.5 VDC max., 60 mA max.
Refer to the LCD-80 Manual for additional information.
1) Set SW2 on the control panel to the ACS position.
2) Connect 24V power to the CPU-400 terminals TB4-1 (+) and TB4-2 ().
Power connections are supervised and power limited.
3) Set the LCD-80 start address to address 01.
4) Set SW2 to 1; set SW3-1 and SW3-2 to OFF.
5) Set the LCD-80 to a size of 128 points.
6) Set the character display: To use a 40 character display, set SW5 OFF
and SW6 ON; to use a 20 character display, set SW5 ON and SW6 OFF.
7) Install a 120-ohm terminating resistor on the last LCD-80.
Figure A-2 LCD-80 ACS Mode EIA-485 Connection
Terminating resistor
on last LCD-80
() EIA-485 In
(+) EIA-485 Out
() EIA-485 In
(+) EIA-485 Out
4
3
2
1
() EIA-485 In
(+) EIA-485 Out
() EIA-485 In
(+) EIA-485 Out
4
3
2
1
TB1
P2
P2
CPU-400
Connecting LCD-80s in
ACS Mode
