User Manual

PAC Portico 2200/1200 Series Installation Guide 15263 Ver 2.1 DRAFT E
© 2003 Blick USA, Inc. Page 25
3. Communication Systems
3.1 Six Wire Bus
The six wire bus is PAC Portico's proprietary communications link for locally connecting door controllers.
Each door controller has a built-in six wire bus interface.
3.1.1 Cable Specification
We recommend that you use multi-stranded, unshielded, 6/8-conductor 22AWG/0.22mm² alarm or signal
cable. If you do use shielded cable, you should reduce the maximum distance by 2 to 3 times depending
on the capacitance of the cable.
The total length of the bus should not exceed 3000ft/1000m, and no single length should be longer than
1500ft/500m. Use the following chart for cable and distance specifications:
Type: 6 conductor, multi-stranded, unshielded cable
This is a linear bus and, where possible, should be set up as shown in Figure 8.
Figure 8 Six Wire Bus Configuration
Note
Branches/spurs are allowed provided they are no longer than 33ft/10m in length. The length of the
spurs should be included as part of the overall length. A maximum of four spurs are recommended.