Termination Setting - Honeywell IdentIPoint Quick Installation Manual

Intelligent smartcard readers

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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

Reader (Master)

Termination ON

Pull-up ON

Pull-down ON

Fig.27. DIP Switch S1 settings on reader and IOMs for RS485

95-7771

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)

IOM (Slave 1)

Termination OFF

termination

IOM (Slave 2)

Termination ON

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