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Internal Modem Connections ION 8000 Series User Guide

Page 88 Chapter 6 - Communications

Internal Modem Connections

This section only applies if your meter has the 33.6 kbps internal modem option.

Refer to the ION 8000 Series Installation Guide for internal modem specifications.

The internal modem is accessed through COM2 and supports all standard modem

protocols at transmission rates from 300 bps to 33600 bps (though 300 bps is not

recommended) and can be shared by up to 31 devices on an RS-485 chain. It is

available with a standard six-pin RJ-11 phone plug, or an eight-pin RJ-31. If you

have multiple meters linked on an RS-485 loop, only the first meter requires an

internal modem. This setup is referred to as a ModemGate (see “The ModemGate

Protocol” on page 91).You can configure the settings of the internal modem with

the front panel or with ION software.

To enable communications through the meter’s internal modem, configure the

COM2 communications module Baud Rate, Unit ID, and Protocol setup registers to

properly match your system, and setup the initialization string for the internal

modem must be using the ModemInit register.

NOTE

When the meter is equipped with the ION Alert module, the modem can initiate calls. Paging is supported

through numeric paging and the TAP1 protocol. See the ION Administrator’s Guide for details on

managing modem connections, setting up periodic dial-out and configuring remote site event

notification.

ModemInit Setup Register

The ModemInit string register defines the initialization string for the internal

modem with a maximum of 47 characters. Edit the ModemInit register and enter the

desired initialization string. The string is sent to the modem as soon as you

download the COM1 module. Note that the string is also sent to the modem

whenever the meter is powered up or the baud rate in the COM1 Communications

module is changed. Any changes to the Modem Init or Baud Rate setup registers

while the modem is online causes the modem to disconnect from the phone line.

CAUTION

Changing the

ModemInit

setup register while the internal modem is online causes the modem to

disconnect from the phone line.

Telephone Network

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