S2000 15017 Rev H 10/08/96 P/N 15017:H
39
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Annunciators and a UDACT-F can be connected to the EIA-485 Annunciator Port simultaneously. However, the modified
EIA-485 protocol alters the assignment of the first eight yellow annunciator LEDs as follows:
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1)
Additional annunciators may be employed in the Receive Only Mode. The wiring to these annunciators will be
supervised only if the power and the EIA-485 circuits are wired sequentially and the Receive/Transmit device is
connected last.
2)
The UDACT-F's Comm Fail Output (TB3, pin #2) must be connected to the AUX Trouble Input on the main power
supply (P5, pin #1 on MPS-24AF or P4, pin #1 on MPS-24B). See connection diagrams.
3)
The power and the EIA-485 circuits are wired sequentially (the FACP connects to the annunciator and the annun-
ciator connects to the UDACT-F).
The FACP must be programmed for an annunciator whenever it's connected to a UDACT-F since the UDACT-F receives the
FACP status on the EIA-485 Annunciator Port. If the FACP is connected to both annunciators and a UDACT-F, all devices
except one must be configured as receive only. Refer to the table below for configuration and supervision arrangements.