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Connecting Annunciators
A-16 AFP-300/AFP-400 Installation PN 50253:C1 05/22/97
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When operating an ACS series annunciator, including the LDM-32), connect the
annunciator to TB4 on the CPU using an EIA-485 circuit as shown in Figure A-5.
• The circuit is power-limited and supervised.
• You can connect up to 32 devices (such as ACMs, LDMs, and AFMs) to the
control panel using ten unique addresses. Only one device per address can answer
back.
• Maximum distance between the control panel and the furthest annunciator: 6,000
feet (@16 AWG).
• Use twisted-pair cable with a characteristic impedance of approximately 120
ohms.
• An EIA-485 circuit is rated 5.5 VDC max., 60 mA max.
• Refer to the ACS Manual and the LDM Manual for additional information.
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Connect ACS- and LDM- series devices to the CPU as shown in Figure A-5, making
sure to install a 120 ohm terminating resistor on the last annunciator in the series.
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