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Telebyte 209 Short Haul Modem

Unit 17 Park Farm Industrial Estate

01850-001 Rev. G

Buntingford, Herts SG9 9AZ UK
TEL: + 44 (0) 1763 273 243  FAX: + 44 (0) 1763 274 106
Web: www.kerisys.com   E-mail: [email protected]

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Short Haul Modem

Quick S

tart Guide

This document provides installation instructions for the Telebyte 209 Short Haul Modem (Keri 
Systems P/N SHM-232). This short haul modem can be used to assist in long-distance, direct, 
connections between a host computer and an access control network. The Telebyte 209 is fully 
compatible with PC/AT serial communication ports and requires no external power for its 
operation.

1.0

Specifications

1.1

Dimensions

0.85 inches High x 1.30 inches Wide x 3.00 inches Long
(2.16 cm H x 3.30 cm W x 7.62 cm L)

1.2

Connector

DB-9F with screw connection terminals

1.3

Cable Run Distance Per Wire Gauge

Using Belden 9502 or its equivalent, see Table 1

2.0

Installation

The short haul modems are shipped in pairs. One modem is attached to the master controller on 
the access control network. The other is attached to the host computer's COM port.

NOTE: Each short haul modem has a small switch allowing the modem to be set for use with 
either Data Terminal Equipment (DTE) or Data Communication Equipment (DCE) devices. 
Please ensure that each modem's switch is set correctly.

The switch is used to set the modem to match the type of device it is connected to.

Insert a thin-blade screwdriver into the switch slot and verify the switch is turned completely 
counter-clockwise for a DTE application or completely clockwise for a DCE application.  
Applying too much pressure while turning the switch may damage the modem.

NOTE: When a KDP-252 cable is used, make sure the short haul modem switch is set for a DCE 
application.

Data Rate (KBPS)

Wire Gauge

19

24

26

9600 Baud

4.9 Miles

3.1 Miles

1.8 Miles

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