Honeywell IdentIPoint Intelligent Smartcard Readers
RS485 COMMUNICATION AND
TERMINATION SETTING
Both IdentIPoint readers and IOMs are
equipped with a termination circuit and
do not need an external termination
resistor. Setting the DIP switch 2 on S1
to ON introduces a termination resistor
on the RS485 line. The units that sit
physically on both ends of an RS485
bus should have their RS485
termination turned on. It is also
recommended to turn on the pull-up and
pull-down resistors in the IdentIPoint
reader (master)
.
Termination OFF
Termination ON
Termination ON
IOM (Slave 1)
Termination OFF
Reader (Master)
Termination ON
Pull-up ON
Pull-down ON
IOM (Slave 2)
Termination ON
Termination OFF
Termination ON
Termination ON
IOM (Slave 1)
Termination OFF
Reader (Master)
Termination ON
Pull-up ON
Pull-down ON
IOM (Slave 2)
Termination ON
Termination OFF
Termination ON
Termination ON
IOM (Slave 1)
Termination OFF
Reader (Master)
Termination ON
Pull-up ON
Pull-down ON
IOM (Slave 2)
Termination ON
Termination ON
Termination OFF
Termination ON
IOM (Slave 1)
Termination OFF
Reader (Master)
Termination ON
Pull-up ON
Pull-down ON
IOM (Slave 2)
Termination ON
Fig.27. DIP Switch S1 settings on reader and IOMs for RS485
termination
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