COM1 Port 9300 Series User’s Guide
Page 148 Chapter 7 - Hardware Reference

Co-existing Hardware Options on the Meter

These are the hardware ordering options that can (and cannot) exist together on

the same meter.

COM1 Port

COM1 is used for RS-485 communications. If you have the ModemGate option on

your meter, COM1 will automatically be set to ModemGate, not RS-485.

NOTE
The internal modem option is hardwired to COM1. If you are using ModemGate, then any meter with an
internal modem that will reside on the serial loop must connect to the serial loop using COM2. If COM1
is used, then the two modems (gated meter internal modem and serially looped meter internal modem)
conflict during communication.

RS-485 Connections

RS-485 connections are made via the captured-wire connectors on the rear of the

meter. Devices can be connected in series using RS-485 (see diagram to the left). Be

sure not to ground the wires at both ends.

The specifications for RS-485 communications are as follows:

Profibus Ethernet Modem Digital
Inputs
Digital
Outputs Analog I/O
Profibus No Yes No Yes No
Ethernet No Yes Ye s Yes No
Modem Yes Yes Ye s Yes Yes
Digital Inputs N o Yes Ye s Yes Yes
Analog I/O No No Yes Yes Yes
Specification Value
Baud Rates Up to 19,200 bps (default is 9,600 bps)
Duplex Half
Supported Protocols ION (default), Modbus RTU, DNP 3.0, EtherGate (COM2), ModemGate
(COM1), and Factory
Isolation Optical isolation from all other inputs and outputs
SH+
-
SH
COM
RS-485
+-