terminals.
port (J3) on the board. In order to download, the database switch 3-3 must
be set to ON. Refer to Table 1.2 on page 11.
Figure 3.2 ACS Mode EIA-485 Connections
TB2
TB1
TB2
TB1
4
3
2
1
4
3
2
1
7
6
5
4
3
2
1
4
3
2
1
7
6
5
Terminating
Resistor
Observe the following requirements when connecting the
EIA-485 circuit:
• The LCD2-80 requires operating power. Connect 24 VDC
power to TB1 terminal 3(+) and TB1 terminal 4 (-). Power
connections are supervised and power-limited.
• The EIA-485 loop can support up to 32 devices on the
loop subject to power supply loading limitations (ACS,
LDM, and LCD-type devices)
• 6000 feet maximum loop length from the CPU to the last
device.
• Do not “T-Tap” the EIA-485 circuit—it will not function
properly. Wire as illustrated.
• Use twisted, shielded pair cable with a characteristic
impedance of approximately 120 ohms.
• EIA-485: 5.5 VDC max; 60 mA max.
• A UL listed 120-ohm terminating resistor (R-120) must be
installed on the last device on the EIA-485 circuit.
• Refer to Appendix 5 for shield termination instructions.
• Terminal block connections on the Fire Alarm Control
Panel are listed in Table 3.1; for illustrations, refer to your
FACP manual.
• A separate reference wire is required for NFS2-3030
applications using ACS annunciators which are not in the
same backbox as the fire alarm control panel’s CPU.
(-)
EIA-485 terminals on CPU
(+)
Cabinet
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