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ACS Mode Configuration
3.2 ACS Mode EIA-485 Connections
4
3
TB2
2
1
7
6
5
4
TB1
3
2
1
4
3
TB2
2
1
7
6
Terminatin
5
g Resistor
4
TB1
3
2
1
NCA-2, NFS2-3030
NFS-320, NFS2-640
Table 3.1 EIA-485 Control Panel Connections (ACS Mode)
Refer to your control panel manual for illustrations of panel-side terminals.
3.3 Programming
The LCD2-80 is programmed using VeriFire
NUP port (J3) on the board. In order to download, the database switch 3-3 must be set to ON. Refer to Table 1.3 on page 9.
14
EIA-485 terminals on CPU
(-)
(+)
Cabinet
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 A 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.
Figure 3.2 ACS Mode EIA-485 Connections
TB7 (+)
EIA-485 (+)
TB7 (-)
EIA-485 (-)
TB11 (+)
EIA-485 (+)
TB11(-)
EIA-485 (-)
Tools. Downloads are performed with a PC, using a standard NUP cable connected to the
®
ACS Mode EIA-485 Connections
LCD2-80 Instruction Manual — P/N 53242:B5 07/26/2019
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