Honeywell IdentIPoint Installation Instructions Manual page 40

Intelligent smartcard system

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HONEYWELL IDENTIPOINT™ INTELLIGENT SMARTCARD SYSTEM

Reader (Master)

Termination ON

Pull-up ON

Pull-down ON

Fig. 30. S1 DIP Switch settings on reader and IOMs for RS485 termination

IOM Address Set up

Each IOM should have its own address. S3 DIP switch on the

IOM holds the RS485 address of each unit. The addresses

can range from 1 to 127, with position 1 corresponding to

20=1, position 2 to 21=2 and so on as shown in Fig.31. Never

use zero as IOM address as zero is reserved for the master

device.

SUM all ON bit values

Never use address zero

Fig. 31. IOM Address set up

95-7767

IOM (Slave 1)

Termination OFF

To work out the address, select a combination of bit locations

on the DIP switch. Each bit has its own value representation.

The RS485 address is obtained by adding all ON-bit values.

E.g. Decimal value 37 will be obtained by turning ON bits 1, 3

and 6 which is equivalent to 1+4+32.

NOTE: It is recommended not to attach more than 4 IOM

IOM (Slave 2)

Termination ON

units to the RS485 bus to maintain a reasonable

signal/response time delay between the reader

and the IOMs. Hence IOM addresses must be

from 1 to 4 only. See Fig.32 for S3 DIP switch set-

tings for up to 4 IOMs.

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