Specifications

CI-8 Installation and Operation
P/N 66104700001 Rev. F 2-1
SECTION 2: CI-8 MULTIPLE
COMMUNICATIONS INTERFACE
DESCRIPTION
The CI-8 is an RS-232C data broadcast box which can be used to increase the number of ACUs
connected to a single host computer and to extend the distance between an ACU and host
computer. The CI-8 is data transparent and can operate at any baud rate up to 9600.
When ACU connection to the CI-8 is through the RS-232 ports, a maximum of eight ACUs may
be used. The maximum distance between any ACU and the CI-8 is 25 ft (7.6 m) for RS-232
communication. When the 20mA loop ports are used, four ACUs may be connected to each of
the eight ports for a maximum of 32 ACUs. The maximum distance between any ACU and the
CI-8 is 2000 ft (610 m) for 20mA communication. Figure 2-1 provides a block diagram of a CI-
8 installation using two RS-232 ports and two 20mA loop ports.
Figure 2-1: CI-8 Installation Block Diagram