PCI3 RS-232/RS-485 Communication Interface. The NC-PCI3 replaces NC-N485PCI2L
The PCI3 Communications Adapter functions as the interface between a host computer’s RS232 port and one or more Honeywell access control panels connected on an RS485 multi-drop line. The adapter translates the PC’s CIDD protocol to the proprietary RS485 protocol.
The PCI3 can be used to replace a PW5K1CVT1 or a PRO22CVT1; however, the PCI3 does not have optical isolation as the others do. This isolation may be useful in some applications.
The PCI3 also replaces the N-485-PCI-2, N-485-HUB-2, and N485PCI2L adapters, and it adds the following features:
• Variable communications speed up to 115.2 Kbps on the RS232 port.
• Capacity to add future technology enhancements without legacy limitations.
• Time with “seconds” in true reports.
• Flash upgrades of NS2 and NS2P access control panels.
The PCI3 operates as the arbitrator of the drop line, polling each API for its information, and determining its status. If an API or panel drops out, the PCI notifies the host. If communication to the host is lost, the PCI sends a buffer command to the panels for them to buffer events (when configured with WIN-PAK version 1.17 or higher using the RS232 ACK/NAK option, where DIP switch 5 is in the UP position). Communications with the host can only be detected when the PCI3 is running in the ACK/NAK mode of operation.
When access control system configurations include an Ethernet-to-RS232 conversion product instead of a direct host connection, the PCI’s RS232 port operates the same as with a direct connection.