Specifications

Alto 818 Installation and Operation
2-22 P/N 66109074001 Rev. D
* This item is not UL listed and may not be used in an access control system which must meet
UL 294 specifications.
2.6 COMMUNICATION INTERFACES
WSE offers two communication interface devices which can be used to interface the Alto 818
to a host computer through the 20mA loop port. These modules can also be used to connect
multiple ACUs to a single host computer. Both communications interfaces are described below.
2.6.1 CI-1 COMMUNICATIONS INTERFACE*
The CI-1 provides the circuitry to allow the Alto 818 to communicate with a host system through
the 20mA loop connector. Placed within 25 feet of the host computer, the CI-1 communicates
through the RS-232 port of the host. The 20mA loop output from the CI-1 can then be interfaced
to multiple ACUs over a distance of up to 2000 feet (610 m).
Figure 2-10: CI-1 Installation Example