Access Control Module
5–10 iSTAR Ultra Installation and Configuration Guide
Wiegand Port Rating
The ACM Wiegand ports and their ratings are listed in Table 5-2 on page 5-10.
RS-485
The RS485 ports can be configured for either the Software House “RM” protocol or the OSDP
(Open Supervised Device Protocol) v2.1.6 using secure channel (AES 128 encryption). Both
protocols use half duplex RS485 communications.
It is important that the ports are wired as shown in Table 5-3 on page 5-10.
The RS-485 connectors are not keyed so it is possible to reverse the signals. If the ground
connector (pin 4) is connected to +12 Vdc (pin 1), damage to the power supply or the RM could
result.
RM Readers
RM Readers - I/8s - R/8s
Normal RM bus wiring is used for RM readers, I/8 boards, and R/8 boards.
Either Wiegand signaling or Magnetic signaling read heads are connected to RM-4s or RM-
4Es. The RM-4 or RM-4E readers are interfaced using RS-485 1 through RS-485-8.
The reader number is determined by a hexadecimal switch on the RM, not by the Port into
which the reader is plugged.
OSDP Readers
OSDP is supported in C•CURE 9000 v2.50 and higher. Support in v2.50 includes point-to-
point configuration only (daisy chain is not allowed).
Table 5-2: ACM Wiegand Port Ratings
Port Rating
Reader Output Control
(Red, Green, Yellow, Beeper)
4.0v - 5.25v, 20mA max
Reader Input Lines
(D0, D1)
Low level < .8v
Reader Output Voltage +12 Vdc
Reader Current 1.5 A per port
Table 5-3: Pin Signals and Colors
STARx Pin Signal Color
1 +12 Vdc Red
2 Tx+ / Rx+ White
3 Tx- / Rx- Green
4 GND Black
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