Instruction manual

Designing and Planning an M2150 System
22 Access Control Design Guide
Selecting the Readers
Select the type of reader to be used for
each access-controlled door. Magnetic
stripe, proximity, smart card and
fingerprint readers are available. All are
easy to use and install, and are available
in a number of attractive designs.
M2150 supports 20mA multiNODE Current Loop Protocol (MCLP), Wiegand and RS485 readers. For sites
requiring compliance with UL294, only the readers listed in Appendix B on page 54 can be used, or any
other UL-approved third-party Wiegand reader. RS485 readers must not be used on sites requiring
compliance with UL294.
20mA (MCLP) readers are normally the best choice. Unlike traditional Wiegand interface readers, which
are susceptible to undetected tampering, 20mA readers use supervised communications. This enables
alarms to be generated if the reader or cable is tampered with or communications is lost.
Some 20mA readers, such as the 843 and 844, are compatible with MIFARE
®
DESfire smart cards, which
could be used not only for access control, but also for applications such as identity checking, e-purse and
government applications. The 844 can read contactless smart cards, including Personal Identity
Verification (PIV) cards (APL listed) used by the U.S. government. Please refer to the reader data sheets
for further information.
Although a mixture of 20mA, Wiegand and RS485 readers can be used, it is normally preferable to use the
same reader type and the minimum number of reader models throughout a site. This will simplify operation
and support, and should result in the need for only one card type.
Note: Elevator nodes (see page 14) can use 20mA or RS485 readers only. All readers must be the same
type in an elevator node.
20mA and Wiegand readers can connect directly to a door controller (including the integrated controller in
a 2DBC, 4DBC or 8DBC). Except in elevator nodes, RS485 readers require an RS485 module to be fitted
(see page 23).
Ordering WIM Modules (Wiegand Readers)
If Wiegand readers are selected, a WIM module must be ordered for each 8DBC, 4DBC, 2DBC or door
controller that connects to a Wiegand reader. There are three types of WIM module:
• WIM-8 – for an 8DC or 8DBC
• WIM-4 – for a 4DC, 4DCN or 4DBC
• WIM-2 – for a 2DC or 2DBC
You will therefore need to consider the number of WIM modules required, and the controllers that they
need to be fitted to.
If you are using a mixture of Wiegand and 20mA/RS485 readers, the most cost-effective solution is to
ensure that the Wiegand readers connect to the minimum number of controllers to reduce the total cost of
the WIM modules.