American Access Systems Touch Plate Reader - 11-65000 - Manual (Page 28)

Page 28 American Access Systems / Security Brands, Inc.
APPendIX A
wIrInG And SYSteM ConFIGUrAtIonS
CONNECTING MULTIPLE UNITS ON AN RS-485 NETWORK
Multiple 11-65000 units can be interconnected by installing an SK-NM485 Network Module in each reader, and
connecting the readers into a network, using single twisted pair, shielded cable with a signal ground, such as Belden
9842 (includes one spare conductor). Please note that the warranty is void on all Secura Key products if the units were
damaged by surges such as lightening. It is strongly recommended that surge protectors be provided on all data,
telephone and power cables in lightening prone areas. See our Bulletin #14.
Install the SK-NM485 module by plugging it into socket J4, located on the 28SA-Plus circuit board at the top-center
(Figure A2). The module has a 3-wire pigtail, which should be connected to the network cable as shown in Figure A1.
Up to 128 28SA-Plus Units can be connected on the reader network. Total combined cable distance for the entire
network is 4000 feet.
While the best performance and longest total cable distance is achieved by connecting networked readers in series
(daisy chained), other configurations such as “T”, Star/Fan-out, and Stubbed are possible (Figure A3).
Typically, an RS-485 Networked system will be used with SK-NETTM Software for WINDOWS® 95/98/NT.
However, if a PC running SA-NETTM or SA-LINKTM (or an ANSI-compatible terminal software program) is connected to
the RS-232 port of any reader connected to the RS-485 network, some basic global functions can be programmed
and broadcast to all readers. These basic functions allow the user to control or program multiple units from a single
PC, to copy programming from one unit to the entire network, and to use global antipassback. This is ideal for small
systems or parking applications where a PC or laptop computer with WINDOWS® 95 is unavailable.
A Serial Printer can be connected to the RS-232 port of any reader to provide real time transaction printing for the
entire network. Use the CBLSA Cable Kit for temporary connection via the RJ-11 data jack, or use the wiring diagrams
for Printer and PC connection on pages 49-50 of the 28SA-Plus Manual.