CIA-675-001 Rev 1.1
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P a g e
Direct: (602) 773-1700
Main: (800) 481-7459
2101 W Peoria Ave, Suite 100
Phoenix, AZ 85029
www.opentechalliance.com
As a default each RS485 channel is fused at 3.1A slow blow fuse. This is sufficient for powering 6 Keypads
and/or Relay Units per channel. If a larger number of devices are required, they must be externally powered from
a different DC source. If external power supplies are used, DO NOT connect the +V wire of the RS485 device
back to the Gateway. Each Keypad / Relay Unit is capable of drawing 3.2W (steady state) with two active
relays. If the Wireless option is installed on a device, it will draw another 1.1W but it may be that the unit is
remotely powered from a separate supply in this case as is not wired to the RS485 cable.
Figure 8
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Fuse to System Size Relationship Diagram
