Figure 21: RSDP Bus on Expansion Board
Each serial connector (A, B, and -) must be connected with its equivalent.
To connect an expansion to a panel or another expansion, you have to slide the plastic covering at the
bottom of the expansion board to expose the connectors.
The RS-485 bus must be terminated at both ends of the cable with a 100-120Ω resistor.
Figure 22: Termination with Resistor
If multi-pair twisted pair cable is used, one pair shall be used for A+ and B- signals (blue and white/blue) and one pair
for GND (orange + white/orange). Unused wires should be terminated with 100 Ω resistors to ground at both ends of
the cable.
The maximum distance between AC-825 to the first OSDP peripheral device is 1K. Similarly, the maximum
distance between any two OSDP peripheral device units is 1 km.
The recommended cable type to be used is STP cat5 (shielded twisted pair category 5). We recommend using a 20-24-AWG cable.
AC-825IP Installation & User Guide
www.rosslaresecurity.com
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