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HandKey II Installation and Operation Manual
Page 18
Revision 2.0
coil is rated at 15 volts, a 15 volt external power supply should be used. In no case
should the external voltage be higher than +24 VDC.
Each Hand Reader has a protection mechanism built in to protect against voltage
transients (spikes) coming back into the Hand Reader from an external relay coil.
Transients from an “opening” or de-energizing relay coil can reach several hundred
volts. This protection is on all Hand Reader outputs and will limit reverse spikes to
approximately 28 volts to protect the open collector transistor driver. Hand Reader
outputs are NOT designed to switch AC voltages. DC voltages MUST be used and the
correct polarities MUST be maintained.
Relays or devices connected to the lock and auxiliary outputs must not exceed 0.1 A
current draw.
Networking and Communications
Hand Reader networking and communications can be configured in one of five ways:
•
as a stand-alone Hand Reader
•
as a master or remote Hand Reader in a Hand Reader network
•
as a remote Hand Reader in a Hand Reader network connected to a host PC
•
as a remote network connected via optional Modem to host PC
•
remote network connected via optional Ethernet to host PC
Stand-alone Hand Reader
When installed as a stand-alone access control system there is no communication
wiring to other Hand Readers or to a host computer. Power input and control output
wiring are all that are required. An RS-232 serial printer output is available for event
logging (refer to the Printer section on page 13). Recognition Systems highly
recommends using Backhand™ software to backup template information stored in the
Hand Reader.
Master or Remote Hand Reader in a Hand Reader Network
Multiple Hand Readers can be linked together in a Hand Reader network.
•
Up to 32 Hand Readers can be linked together on a 2-wire RS-485 or 4-wire RS-
422 network (see Figure 3-1).
•
Two twisted-pair, shielded, AWG 22 (or larger) wire should be used (Recognition
Systems recommends Belden 82732 or its equivalent).
•
The wiring must be a “daisy chain” network from Hand Reader to Hand Reader
and must not exceed 4,000 feet (1220 meters) in total length.
NOTE
Содержание HandKey II
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