Multi-Tech Systems 7500, 7600 manual ModemGate Protocol, Workstation with ION Enterprise and modem

ION 7500 / ION 7600 User’s Guide Internal Modem Connections

The ModemGate Protocol

The ModemGate feature 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 MODEMGATE, all data received by the meter’s internal modem is automatically transferred to the serial network. ModemGate is available on either COM1 and COM 2, but you cannot use the protocol on both ports simultaneously.

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.

Meter with an internal modem on COM 3. The serial network is connected to COM1.

ModemGate connections do not connect a workstation with ION Enterprise (or other master device) to the gateway meter’s COM1 or COM 2 port, but rather the gateway meter’s internal modem port (COM 3).

The example below illustrates how the ION Management Console’s Sites and

Devices windows appear:

The Modem Site

The ION 7600 with internal modem

The RS-485 device network connected to the meter with the internal modem.

The same RS-485 serial protocol must be selected for connections to multiple devices along the same bus.

Refer to the ION Meter as a ModemGate technical note for complete details on configuring your meter for ModemGate.

Chapter 5 - Features and Applications Page 135