Keyscan CA250B User Manual

Keyscan Inc. – Technical Guide (PC109x - 04.15)
65
CIM Communication
The Communication Interlink Module (CIM) is used to establish PC to ACU and ACU to ACU communication
when multiple access control units are installed on a communication bus. The CIM uses highly reliable CAN Bus
architecture on CAT 5 cable with two (2) twisted pairs. The CIM modes of communication are as follows on the
CAN Bus:
 CAN Bus 1 (required) - PC to ACU main communication
 CAN Bus 2 (optional) - ACU to ACU communication for global functions (i.e. global anti-pass back, global
time zones, and global I/Os)
 CAN Bus 2 - CIM to CIM communication for CIM hardware control and monitoring and Keyscan’s reverse
network communication
Keyscan recommends CAN Bus 1 and CAN Bus 2 are connected on all CIM units.
Figure 46 – CIM Overview
CIM Conventions
Before connecting, please be aware of the following CIM conventions.
 One CIM must be connected to each ACU on the communication bus
 The CIM modules inter-connect two or more ACUs; CIM modules are not required for a single ACU
communication bus
CIM 1
CIM n
ACU 1
* serial
or
network
connection
CAN Bus 1
ACU 2 ACU n
CIM 0
Refer to BPS/CAN Bus
Distance chart for
maximum bus distances.
CAN Bus 2
CAT5 - 2 twisted pairs
1 CIM as Global
Master
(least busy ACU)
optional
CIM link
to network
* CIM 0 is the unit with the
serial or network connection
which can be anywhere on
the CAN Bus. Only one CIM
can be designated as CIM 0.
Control
Board
Control
Board
Control
Board
PC109x
PC109x
PC109x
KI-00261E-07-12

Keyscan CA250B Specifications

General

Brand	Keyscan
Model	CA250B
Category	Controller
Language	English