Specifications

CI-1 and CI-8 Communications Interface
1-4
Figure 1-4: Backup Battery Connection
NOTE:
The CI-1 does not charge the two 12VDC batteries; use an external battery charger. The
charge level must be checked periodically to assure proper power levels.
Follow the below procedure to connect batteries to the CI-1. Connecting the batteries incorrectly
will blow one or both fuses on the CI-1.
1. Connect the first battery's negative terminal to the -12 V terminal of the CI-1, and connect the
battery's positive terminal to the common (C) terminal.
2. Connect the second battery's negative terminal to the CI-1 common (C) terminal, and
connect the battery's positive terminal to the +12 V terminal of the CI-1.
COMMUNICATION
The CI-1 connects to the ACUs via the 20 mA terminals. Four-wire, dual twisted-pair, 24-gauge
(minimum), unshielded wire is required. Four wires in a single twisted configuration may not be
used. The maximum cable length is 2000 ft, to a maximum of four ACUs when no RF interference
is present. The actual cable length and number of ACUs supported will be impacted by
environmental conditions
The ACU cable supplied with the host or a standard null-modem cable may be used to connect
the CI-1 and host. Figure 1-5 shows the minimum wire connections between the CI-1 and host.