Table of Contents
Advertisement
Multiple ACU Communication
The following table reviews supported communication modes, devices, and applicable wiring diagrams/parts
list for multiple ACU communication loops.
Mode
Serial
Serial
USB
USB
USB
Network (TCP/IP)
Network (TCP/IP)
Network (TCP/IP)
Network (TCP/IP)
Network (TCP/IP)
Wireless Network (TCP/IP)
Wireless Network (TCP/IP)
Wireless Network (TCP/IP)
Modem
Modem
Inter-building Communication / Ground Loops
A ground loop is a current across a cable created by a difference in potential between two grounded points, as
may exist with two buildings connected by a long run of copper cables. When two devices are connected with
potential ground differences, voltage flows from high to low through the data cable, even the ground wire. If
the voltage potential is large enough, the equipment is unable to handle the excess voltage and as a result the
communication ports are damaged. Even small ground loop voltages cause transmission errors with data
signals riding on top of the ground loop current.
For communication between two buildings, the industry standard is fiber optic modems. Ensure that the
input/output signal protocol and number of wires from the access control communication boards are the same
at both fiber optic modems that connect the buildings. This is referred to as a point to point signal. Contact a
fiber optic modem distributor for more information regarding types of fiber optic modems, cables, and
distances.
Keyscan Technical Guide (PC109x - 04.12)
Table 12 – Multiple ACU Communication
Devices
CB-485
CPB-10-2
USB Adaptor/CB-485 (RS-232)
USB Adaptor/CB-485 (RS-485)
USB Adaptor/CPB-10-2
NETCOM2P or NETCOM6P/CB-485
NETCOM2 or NETCOM6/CB-485
NETCOM2 or NETCOM6/CPB-10-2
NETCOM2P or NETCOM6P/CB-485 (1 to 1)
NETCOM2 or NETCOM6 (1 per ACU)
NETCOM2WH or NETCOM6WH/CB-485
NETCOM2WH or NETCOM6WH/CPB-10-2
NETCOM2WH or NETCOM6WH (1 per ACU)
CB-485M/CB485/MC33H
MC9600/MC33H/CPB-10-2
Figure
Figure 68
Figure 69
Figure 70
Figure 71
Figure 72
Figure 73
Figure 74
Figure 75
Figure 76
Figure 77
Figure 78
Figure 79
Figure 80
Figure 81
Figure 82
70
Advertisement
Table of Contents
