User's Manual

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V.24 - RS232 connections (eCAP, eESPA) 151

eCAP

There are four different types of devices that can be connected to the

eCAP module using V.24/RS232, as follows:

• Nurse Call systems

There are many types of Nurse Call systems offering data using

V.24/RS232. However, there is no standard protocol.

• Building Management systems

There are many types of Building Management systems offering data

using V.24/RS232. However, there is no standard protocol.

• Paging systems

There are many types of Paging systems. Almost all offer a

V.24/RS232 interface carrying the ESPA protocol. If the paging System

supports ESPA 444 protocol, use the eESPA module instead of the

eCAP.

•

Line Printer Protocols

Some older Building Management systems offer a line printer

protocol over V.24/RS232. This is a simple type of protocol, offering

only incoming data. There is no guarding on the protocol, such as

ACK/NAK, or timers.

Before using the eCAP module, check which protocol is offered, and check

with Nortel, to see if the protocol is supported by DECT Messenger.

If the protocol is supported, install the correct eCAP module. If a Line

Printer protocol is required, you can build the protocol yourself.

Remember that the DECT Messenger structure is based on five

parameters; see “Parameters required to set an alarm” (page 102). You

must know which parameters are coming in from the external system,

and you must specify these parameters in DECT Messenger. For

more information, see the chapter Module - eCAP in

DECT Messenger

Installation and Commissioning (NN43120-301), which describes the

supported protocols in detail.

eESPA

The eESPA module supports the ESPA 444 protocol. This is a complex

protocol; see the chapter Module - eESPA in DECT Messenger Installation

and Commissioning (NN43120-301) for more detailed information about

the protocol. Read the information provided for the protocol before

attempting to set up the eESPA Module.

Nortel Communication Server 1000

DECT Messenger Fundamentals

NN43120-120 02.01

11 May 2009