GE Industrial Solutions EPM4500 Submeter - Manual (Page 47)

CHAPTER 4: COMMUNICATIONS MODBUS ACTIVATION
EPM 4500 SUB METER – INSTRUCTION MANUAL 4–5
4.2 Modbus Activation
4.2.1 Overview
The EPM4500 is shipped with Modbus not activated. To activate the Modbus protocol, it is
necessary to use the Hilgraeve HyperTerminal Private Edition software. This software is
available from the following website:
http://www.hilgraeve.com/htpe
Once Modbus is activated, the meter will ignore the following ASCII commands unless the
login string is sent using the “Key Macros” function within HyperTerminal. Set up “Key
Macros” to send the login string (see Logging into the Meter on page 4–6) followed by
[ENTER].
Note IMPORTANT: The log in string must be sent without breaking up packets. A direct
connection from a serial port to the EPM4500 RS485 port (via RS232/485 converter) is
highly recommended. GE's Ethernet Gateway will break up this login string into packets
and prevent login.
The EPM4500 only allows login at 9600, 19200 or 38400 baud when NOT in Modbus mode.
This is displayed as HUNT in the meter display under Serial # Registers. Once in Modbus,
the EPM4500 only responds at the programmed baud rate.
4.2.2 Configuring a New HyperTerminal Session
Use the following procedure to configure a new HyperTerminal session.
Z Enter the New Connection Name.
Z Select the COM port to connect to the meter.
Z Select the COM port properties. The following window will appear.
Use the setting shown below.