Keyscan Technical Guide (PC109x - 04.12)
70
Multiple ACU Communication
The following table reviews supported communication modes, devices, and applicable wiring diagrams/parts
list for multiple ACU communication loops.
Table 12 – Multiple ACU Communication
Mode Devices Figure
Serial CB-485 Figure 68
Serial CPB-10-2 Figure 69
USB USB Adaptor/CB-485 (RS-232) Figure 70
USB USB Adaptor/CB-485 (RS-485) Figure 71
USB USB Adaptor/CPB-10-2 Figure 72
Network (TCP/IP) NETCOM2P or NETCOM6P/CB-485 Figure 73
Network (TCP/IP) NETCOM2 or NETCOM6/CB-485 Figure 74
Network (TCP/IP) NETCOM2 or NETCOM6/CPB-10-2 Figure 75
Network (TCP/IP) NETCOM2P or NETCOM6P/CB-485 (1 to 1) Figure 76
Network (TCP/IP) NETCOM2 or NETCOM6 (1 per ACU) Figure 77
Wireless Network (TCP/IP) NETCOM2WH or NETCOM6WH/CB-485 Figure 78
Wireless Network (TCP/IP) NETCOM2WH or NETCOM6WH/CPB-10-2 Figure 79
Wireless Network (TCP/IP) NETCOM2WH or NETCOM6WH (1 per ACU) Figure 80
Modem CB-485M/CB485/MC33H Figure 81
Modem MC9600/MC33H/CPB-10-2 Figure 82
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.
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