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Communications
 ION 7500 / ION 7600 User’s Guide
Page 126
Chapter 5 - Features and Applications 
Communications
The following illustration shows all the possible connections to the 
communications card. 
The ION 7500 and ION 7600 meters have numerous communication possibilities 
depending on your ordering preferences. Both models can have exactly the same 
communications options. 
All of the communications ports can be used concurrently. 
1
10Base-FL option will only be available if -FL was specified when the meter was ordered.
COM 3:
Internal modem or optical port
COM 3 provides an optical port or an optional internal modem. You can
configure only one of these media types to use the communications port
at any given time.
The optical port (located on the front of the meter) is used for serial
communications, and supports these protocols: ION, Factory, Modbus RTU,
GPS, Modbus Master, or DNP 3.00.
COM4 COM3
COM2 COM1
COM1:
RS-232 or RS-485 serial connection
COM1 is actually two ports: RS-232 for
direct connections, and RS-485 for serial
connections. Both ports support these
protocols: ION, Factory, EtherGate, GPS,
ModemGate, Modbus RTU, Modbus
Master or DNP 3.00. 
Note that you cannot use the RS-232 and
RS-485 ports on COM1 simultaneously.
COM 2:
RS-485 serial connection
COM 2 provides an RS-485 serial port
that supports ION, ModemGate, GPS,
EtherGate, ModemGate, Modbus RTU,
DNP 3.00, Modbus Master, or Factory
protocols.
The meter internal modem
communicates to the server
computer over the telephone
network.
COM 4 (front panel menu 
“Network”): Ethernet connection
COM 4 provides optional 10Base-T or
10Base-FL Ethernet communications. 
COM Port
Available Connections
Standard/Option
1
Selectable RS-232/RS-485 port
Standard
2
Dedicated RS-485 port
Standard
3
IrDA optical port
Standard
3
Internal modem 
Option
4
10Base-T (or –FL) Ethernet 
1
Option