CTI Products CHIB CommandSTAR Lite Host Interface Module - Manual (Page 6)

CHIB Hardware Reference Theory of Operation
CTI Products, Inc.
68-11662-100
2
2. Theory of Operation
The CHIB module does not provide any direct monitoring or control functions.
Its purpose is to bridge the MCN network to the CommandSTAR Lite console.
The CHIB module emulates a series of I/O modules on the CommandSTAR Lite's
I/O communications bus. Since the console's I/O bus is RS-485, an RS-232 to
RS-485 converter is required between the CHIB and the console.
The CHIB supports multiple baud rates from 9600 baud up to 115.2K baud,
selectable from the rear panel.
The CHIB module can communicate with only one Comparator I/O module (CIB
or AIB). It is limited to the following number of receivers:
CHIB module operating with AIB Module: 14 Receivers
CHIB module operating with CIB Module: 8 Receivers
Figure 2 Typical System
2.1 Status Indications
The CHIB maps the Voted, Receiving, Disabled and Failed indications from the
comparator to LEDs on the CommandSTAR Lite console.
CommandSTAR Lite
Console
CHIB
CVT*
Astrotac
Comparator
AIB
MCN Network
(May use EXB Modules
to extend the network.)
RS-232
Serial Cable
RS-232
Serial Cable
I/O Cable
RS-485
Transition Cable
* CVT is RS-485 to RS-232 Converter.