ION 8000 Series User Guide Internal Modem Connections
Chapter 6 - Communications Page 91
Configuring the COM2 Communications module in Designer
Launch Designer, and configure the COM2 Communications module Baud Rate,
Unit ID, and Protocol setup registers to match your communications system.
Configure the initialization string for the internal modem using the ModemInit
register. Refer to “ModemInit Setup Register” on page 88.
The ModemGate Protocol
ModemGate is a powerful feature that creates a communications connection
between the telephone network and an RS-485 serial network of devices. When
you specify the protocol for a meter’s COM port as M
ODEMGATE, all data received
by the meter’s internal modem is automatically transferred to the serial network.
ModemGate is available on either the COM1 or COM4 port (optional on some
meters); you cannot use the protocol on both ports simultaneously.
The baud rate used between connected modems is independent of the internal
baud rate used for communication between the meter and its modem.
Wire a serial connection between one or more meters and the meter COM port
hosting the ModemGate (COM1 or COM4). You can make ModemGate
connections through an RS-232 cable to a single device, or through an RS-485
shielded twisted pair cable to multiple devices. ModemGate connections do not
connect a workstation running ION Enterprise (or other master device) to the
gateway meter’s COM1 or COM4 port, but rather to the gateway meter’s internal
modem port (COM2).
Configuring the meter for ModemGate
1. Install the meter and connect the internal modem.
Telephone Network
Meter with internal
modem on COM2.
The serial network is
connected to COM1.
Workstation with
ION Enterprise
and modem.
Each device on the RS-485 loop,
including the gateway meter’s internal
modem, must have a unique Unit ID.
All serial devices must operate at the
same baud rate as the gateway meter.
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